Update source to SDL2 2.0.12

Edward Rudd

2020-05-02 03f8528315fa46c95991a34f3325d7b33ae5538c

 source/src/render/opengles2/SDL_render_gles2.c

@@ -1,6 +1,6 @@
/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
@@ -29,50 +29,14 @@
#include "../../video/SDL_blit.h"
#include "SDL_shaders_gles2.h"

/* !!! FIXME: Emscripten makes these into WebGL calls, and WebGL doesn't offer
   !!! FIXME:  client-side arrays (without an Emscripten compatibility hack,
   !!! FIXME:  at least), but the current VBO code here is dramatically
   !!! FIXME:  slower on actual iOS devices, even though the iOS Simulator
   !!! FIXME:  is okay. Some time after 2.0.4 ships, we should revisit this,
   !!! FIXME:  fix the performance bottleneck, and make everything use VBOs.
*/
#ifdef __EMSCRIPTEN__
#define SDL_GLES2_USE_VBOS 1
#else
#define SDL_GLES2_USE_VBOS 0
#endif

/* To prevent unnecessary window recreation,
 * these should match the defaults selected in SDL_GL_ResetAttributes 
 * these should match the defaults selected in SDL_GL_ResetAttributes
 */
#define RENDERER_CONTEXT_MAJOR 2
#define RENDERER_CONTEXT_MINOR 0

/* Used to re-create the window with OpenGL ES capability */
extern int SDL_RecreateWindow(SDL_Window * window, Uint32 flags);

/*************************************************************************************************
 * Bootstrap data                                                                                *
 *************************************************************************************************/

static SDL_Renderer *GLES2_CreateRenderer(SDL_Window *window, Uint32 flags);

SDL_RenderDriver GLES2_RenderDriver = {
    GLES2_CreateRenderer,
    {
        "opengles2",
        (SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC | SDL_RENDERER_TARGETTEXTURE),
        4,
        {
        SDL_PIXELFORMAT_ARGB8888,
        SDL_PIXELFORMAT_ABGR8888,
        SDL_PIXELFORMAT_RGB888,
        SDL_PIXELFORMAT_BGR888
        },
        0,
        0
    }
};

/*************************************************************************************************
 * Context structures                                                                            *
@@ -109,7 +73,6 @@
    GLES2_ShaderType type;
    const GLES2_ShaderInstance *instance;
    int references;
    Uint8 modulation_r, modulation_g, modulation_b, modulation_a;
    struct GLES2_ShaderCacheEntry *prev;
    struct GLES2_ShaderCacheEntry *next;
} GLES2_ShaderCacheEntry;
@@ -126,8 +89,7 @@
    GLES2_ShaderCacheEntry *vertex_shader;
    GLES2_ShaderCacheEntry *fragment_shader;
    GLuint uniform_locations[16];
    Uint8 color_r, color_g, color_b, color_a;
    Uint8 modulation_r, modulation_g, modulation_b, modulation_a;
    Uint32 color;
    GLfloat projection[4][4];
    struct GLES2_ProgramCacheEntry *prev;
    struct GLES2_ProgramCacheEntry *next;
@@ -152,7 +114,6 @@
{
    GLES2_UNIFORM_PROJECTION,
    GLES2_UNIFORM_TEXTURE,
    GLES2_UNIFORM_MODULATION,
    GLES2_UNIFORM_COLOR,
    GLES2_UNIFORM_TEXTURE_U,
    GLES2_UNIFORM_TEXTURE_V
@@ -160,6 +121,7 @@

typedef enum
{
    GLES2_IMAGESOURCE_INVALID,
    GLES2_IMAGESOURCE_SOLID,
    GLES2_IMAGESOURCE_TEXTURE_ABGR,
    GLES2_IMAGESOURCE_TEXTURE_ARGB,
@@ -171,16 +133,32 @@
    GLES2_IMAGESOURCE_TEXTURE_EXTERNAL_OES
} GLES2_ImageSource;

typedef struct GLES2_DriverContext
typedef struct
{
    SDL_Rect viewport;
    SDL_bool viewport_dirty;
    SDL_Texture *texture;
    SDL_Texture *target;
    SDL_BlendMode blend;
    SDL_bool cliprect_enabled_dirty;
    SDL_bool cliprect_enabled;
    SDL_bool cliprect_dirty;
    SDL_Rect cliprect;
    SDL_bool texturing;
    SDL_bool is_copy_ex;
    Uint32 color;
    Uint32 clear_color;
    int drawablew;
    int drawableh;
    GLES2_ProgramCacheEntry *program;
    GLfloat projection[4][4];
} GLES2_DrawStateCache;

typedef struct GLES2_RenderData
{
    SDL_GLContext *context;

    SDL_bool debug_enabled;

    struct {
        SDL_BlendMode blendMode;
        SDL_bool tex_coords;
    } current;

#define SDL_PROC(ret,func,params) ret (APIENTRY *func) params;
#include "SDL_gles2funcs.h"
@@ -192,16 +170,17 @@
    GLenum *shader_formats;
    GLES2_ShaderCache shader_cache;
    GLES2_ProgramCache program_cache;
    GLES2_ProgramCacheEntry *current_program;
    Uint8 clear_r, clear_g, clear_b, clear_a;

#if SDL_GLES2_USE_VBOS
    GLuint vertex_buffers[4];
    GLsizeiptr vertex_buffer_size[4];
#endif
} GLES2_DriverContext;
    GLuint vertex_buffers[8];
    size_t vertex_buffer_size[8];
    int current_vertex_buffer;
    GLES2_DrawStateCache drawstate;
} GLES2_RenderData;

#define GLES2_MAX_CACHED_PROGRAMS 8

static const float inv255f = 1.0f / 255.0f;


SDL_FORCE_INLINE const char*
@@ -223,20 +202,20 @@
SDL_FORCE_INLINE void
GL_ClearErrors(SDL_Renderer *renderer)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *) renderer->driverdata;
    GLES2_RenderData *data = (GLES2_RenderData *) renderer->driverdata;

    if (!data->debug_enabled) {
        return;
    }
    while (data->glGetError() != GL_NO_ERROR) {
        continue;
        /* continue; */
    }
}

SDL_FORCE_INLINE int
GL_CheckAllErrors (const char *prefix, SDL_Renderer *renderer, const char *file, int line, const char *function)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *) renderer->driverdata;
    GLES2_RenderData *data = (GLES2_RenderData *) renderer->driverdata;
    int ret = 0;

    if (!data->debug_enabled) {
@@ -269,17 +248,7 @@
 * Renderer state APIs                                                                           *
 *************************************************************************************************/

static int GLES2_ActivateRenderer(SDL_Renderer *renderer);
static void GLES2_WindowEvent(SDL_Renderer * renderer,
                              const SDL_WindowEvent *event);
static int GLES2_UpdateViewport(SDL_Renderer * renderer);
static void GLES2_DestroyRenderer(SDL_Renderer *renderer);
static int GLES2_SetOrthographicProjection(SDL_Renderer *renderer);


static SDL_GLContext SDL_CurrentContext = NULL;

static int GLES2_LoadFunctions(GLES2_DriverContext * data)
static int GLES2_LoadFunctions(GLES2_RenderData * data)
{
#if SDL_VIDEO_DRIVER_UIKIT
#define __SDL_NOGETPROCADDR__
@@ -307,7 +276,7 @@
}

static GLES2_FBOList *
GLES2_GetFBO(GLES2_DriverContext *data, Uint32 w, Uint32 h)
GLES2_GetFBO(GLES2_RenderData *data, Uint32 w, Uint32 h)
{
   GLES2_FBOList *result = data->framebuffers;
   while ((result) && ((result->w != w) || (result->h != h)) ) {
@@ -327,18 +296,15 @@
static int
GLES2_ActivateRenderer(SDL_Renderer * renderer)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;
    GLES2_RenderData *data = (GLES2_RenderData *)renderer->driverdata;

    if (SDL_CurrentContext != data->context) {
    if (SDL_GL_GetCurrentContext() != data->context) {
        /* Null out the current program to ensure we set it again */
        data->current_program = NULL;
        data->drawstate.program = NULL;

        if (SDL_GL_MakeCurrent(renderer->window, data->context) < 0) {
            return -1;
        }
        SDL_CurrentContext = data->context;

        GLES2_UpdateViewport(renderer);
    }

    GL_ClearErrors(renderer);
@@ -349,14 +315,7 @@
static void
GLES2_WindowEvent(SDL_Renderer * renderer, const SDL_WindowEvent *event)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;

    if (event->event == SDL_WINDOWEVENT_SIZE_CHANGED ||
        event->event == SDL_WINDOWEVENT_SHOWN ||
        event->event == SDL_WINDOWEVENT_HIDDEN) {
        /* Rebind the context to the window area */
        SDL_CurrentContext = NULL;
    }
    GLES2_RenderData *data = (GLES2_RenderData *)renderer->driverdata;

    if (event->event == SDL_WINDOWEVENT_MINIMIZED) {
        /* According to Apple documentation, we need to finish drawing NOW! */
@@ -434,538 +393,31 @@
    return SDL_TRUE;
}

static int
GLES2_UpdateViewport(SDL_Renderer * renderer)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;

    if (SDL_CurrentContext != data->context) {
        /* We'll update the viewport after we rebind the context */
        return 0;
    }

    if (renderer->target) {
        data->glViewport(renderer->viewport.x, renderer->viewport.y,
                         renderer->viewport.w, renderer->viewport.h);
    } else {
        int w, h;

        SDL_GL_GetDrawableSize(renderer->window, &w, &h);
        data->glViewport(renderer->viewport.x, (h - renderer->viewport.y - renderer->viewport.h),
                         renderer->viewport.w, renderer->viewport.h);
    }

    if (data->current_program) {
        GLES2_SetOrthographicProjection(renderer);
    }
    return GL_CheckError("", renderer);
}

static int
GLES2_UpdateClipRect(SDL_Renderer * renderer)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;

    if (SDL_CurrentContext != data->context) {
        /* We'll update the clip rect after we rebind the context */
        return 0;
    }

    if (renderer->clipping_enabled) {
        const SDL_Rect *rect = &renderer->clip_rect;
        data->glEnable(GL_SCISSOR_TEST);
        if (renderer->target) {
            data->glScissor(renderer->viewport.x + rect->x, renderer->viewport.y + rect->y, rect->w, rect->h);
        } else {
            int w, h;

            SDL_GL_GetDrawableSize(renderer->window, &w, &h);
            data->glScissor(renderer->viewport.x + rect->x, h - renderer->viewport.y - rect->y - rect->h, rect->w, rect->h);
        }
    } else {
        data->glDisable(GL_SCISSOR_TEST);
    }
    return 0;
}

static void
GLES2_DestroyRenderer(SDL_Renderer *renderer)
GLES2_EvictShader(GLES2_RenderData *data, GLES2_ShaderCacheEntry *entry)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;

    /* Deallocate everything */
    if (data) {
        GLES2_ActivateRenderer(renderer);

        {
            GLES2_ShaderCacheEntry *entry;
            GLES2_ShaderCacheEntry *next;
            entry = data->shader_cache.head;
            while (entry) {
                data->glDeleteShader(entry->id);
                next = entry->next;
                SDL_free(entry);
                entry = next;
            }
        }
        {
            GLES2_ProgramCacheEntry *entry;
            GLES2_ProgramCacheEntry *next;
            entry = data->program_cache.head;
            while (entry) {
                data->glDeleteProgram(entry->id);
                next = entry->next;
                SDL_free(entry);
                entry = next;
            }
        }
        if (data->context) {
            while (data->framebuffers) {
                GLES2_FBOList *nextnode = data->framebuffers->next;
                data->glDeleteFramebuffers(1, &data->framebuffers->FBO);
                GL_CheckError("", renderer);
                SDL_free(data->framebuffers);
                data->framebuffers = nextnode;
            }
            SDL_GL_DeleteContext(data->context);
        }
        SDL_free(data->shader_formats);
        SDL_free(data);
    /* Unlink the shader from the cache */
    if (entry->next) {
        entry->next->prev = entry->prev;
    }
    SDL_free(renderer);
    if (entry->prev) {
        entry->prev->next = entry->next;
    }
    if (data->shader_cache.head == entry) {
        data->shader_cache.head = entry->next;
    }
    --data->shader_cache.count;

    /* Deallocate the shader */
    data->glDeleteShader(entry->id);
    SDL_free(entry);
}

/*************************************************************************************************
 * Texture APIs                                                                                  *
 *************************************************************************************************/

static int GLES2_CreateTexture(SDL_Renderer *renderer, SDL_Texture *texture);
static int GLES2_UpdateTexture(SDL_Renderer *renderer, SDL_Texture *texture, const SDL_Rect *rect,
                               const void *pixels, int pitch);
static int GLES2_UpdateTextureYUV(SDL_Renderer * renderer, SDL_Texture * texture,
                               const SDL_Rect * rect,
                               const Uint8 *Yplane, int Ypitch,
                               const Uint8 *Uplane, int Upitch,
                               const Uint8 *Vplane, int Vpitch);
static int GLES2_LockTexture(SDL_Renderer *renderer, SDL_Texture *texture, const SDL_Rect *rect,
                             void **pixels, int *pitch);
static void GLES2_UnlockTexture(SDL_Renderer *renderer, SDL_Texture *texture);
static int GLES2_SetRenderTarget(SDL_Renderer * renderer, SDL_Texture * texture);
static void GLES2_DestroyTexture(SDL_Renderer *renderer, SDL_Texture *texture);

static int
GLES2_CreateTexture(SDL_Renderer *renderer, SDL_Texture *texture)
{
    GLES2_DriverContext *renderdata = (GLES2_DriverContext *)renderer->driverdata;
    GLES2_TextureData *data;
    GLenum format;
    GLenum type;
    GLenum scaleMode;

    GLES2_ActivateRenderer(renderer);

    /* Determine the corresponding GLES texture format params */
    switch (texture->format)
    {
    case SDL_PIXELFORMAT_ARGB8888:
    case SDL_PIXELFORMAT_ABGR8888:
    case SDL_PIXELFORMAT_RGB888:
    case SDL_PIXELFORMAT_BGR888:
        format = GL_RGBA;
        type = GL_UNSIGNED_BYTE;
        break;
    case SDL_PIXELFORMAT_IYUV:
    case SDL_PIXELFORMAT_YV12:
    case SDL_PIXELFORMAT_NV12:
    case SDL_PIXELFORMAT_NV21:
        format = GL_LUMINANCE;
        type = GL_UNSIGNED_BYTE;
        break;
#ifdef GL_TEXTURE_EXTERNAL_OES
    case SDL_PIXELFORMAT_EXTERNAL_OES:
        format = GL_NONE;
        type = GL_NONE;
        break;
#endif
    default:
        return SDL_SetError("Texture format not supported");
    }

    if (texture->format == SDL_PIXELFORMAT_EXTERNAL_OES &&
        texture->access != SDL_TEXTUREACCESS_STATIC) {
        return SDL_SetError("Unsupported texture access for SDL_PIXELFORMAT_EXTERNAL_OES");
    }

    /* Allocate a texture struct */
    data = (GLES2_TextureData *)SDL_calloc(1, sizeof(GLES2_TextureData));
    if (!data) {
        return SDL_OutOfMemory();
    }
    data->texture = 0;
#ifdef GL_TEXTURE_EXTERNAL_OES
    data->texture_type = (texture->format == SDL_PIXELFORMAT_EXTERNAL_OES) ? GL_TEXTURE_EXTERNAL_OES : GL_TEXTURE_2D;
#else
    data->texture_type = GL_TEXTURE_2D;
#endif
    data->pixel_format = format;
    data->pixel_type = type;
    data->yuv = ((texture->format == SDL_PIXELFORMAT_IYUV) || (texture->format == SDL_PIXELFORMAT_YV12));
    data->nv12 = ((texture->format == SDL_PIXELFORMAT_NV12) || (texture->format == SDL_PIXELFORMAT_NV21));
    data->texture_u = 0;
    data->texture_v = 0;
    scaleMode = (texture->scaleMode == SDL_ScaleModeNearest) ? GL_NEAREST : GL_LINEAR;

    /* Allocate a blob for image renderdata */
    if (texture->access == SDL_TEXTUREACCESS_STREAMING) {
        size_t size;
        data->pitch = texture->w * SDL_BYTESPERPIXEL(texture->format);
        size = texture->h * data->pitch;
        if (data->yuv) {
            /* Need to add size for the U and V planes */
            size += 2 * ((texture->h + 1) / 2) * ((data->pitch + 1) / 2);
        }
        if (data->nv12) {
            /* Need to add size for the U/V plane */
            size += 2 * ((texture->h + 1) / 2) * ((data->pitch + 1) / 2);
        }
        data->pixel_data = SDL_calloc(1, size);
        if (!data->pixel_data) {
            SDL_free(data);
            return SDL_OutOfMemory();
        }
    }

    /* Allocate the texture */
    GL_CheckError("", renderer);

    if (data->yuv) {
        renderdata->glGenTextures(1, &data->texture_v);
        if (GL_CheckError("glGenTexures()", renderer) < 0) {
            return -1;
        }
        renderdata->glActiveTexture(GL_TEXTURE2);
        renderdata->glBindTexture(data->texture_type, data->texture_v);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_MIN_FILTER, scaleMode);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_MAG_FILTER, scaleMode);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
        renderdata->glTexImage2D(data->texture_type, 0, format, (texture->w + 1) / 2, (texture->h + 1) / 2, 0, format, type, NULL);

        renderdata->glGenTextures(1, &data->texture_u);
        if (GL_CheckError("glGenTexures()", renderer) < 0) {
            return -1;
        }
        renderdata->glActiveTexture(GL_TEXTURE1);
        renderdata->glBindTexture(data->texture_type, data->texture_u);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_MIN_FILTER, scaleMode);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_MAG_FILTER, scaleMode);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
        renderdata->glTexImage2D(data->texture_type, 0, format, (texture->w + 1) / 2, (texture->h + 1) / 2, 0, format, type, NULL);
        if (GL_CheckError("glTexImage2D()", renderer) < 0) {
            return -1;
        }
    }

    if (data->nv12) {
        renderdata->glGenTextures(1, &data->texture_u);
        if (GL_CheckError("glGenTexures()", renderer) < 0) {
            return -1;
        }
        renderdata->glActiveTexture(GL_TEXTURE1);
        renderdata->glBindTexture(data->texture_type, data->texture_u);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_MIN_FILTER, scaleMode);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_MAG_FILTER, scaleMode);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
        renderdata->glTexImage2D(data->texture_type, 0, GL_LUMINANCE_ALPHA, (texture->w + 1) / 2, (texture->h + 1) / 2, 0, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, NULL);
        if (GL_CheckError("glTexImage2D()", renderer) < 0) {
            return -1;
        }
    }

    renderdata->glGenTextures(1, &data->texture);
    if (GL_CheckError("glGenTexures()", renderer) < 0) {
        return -1;
    }
    texture->driverdata = data;
    renderdata->glActiveTexture(GL_TEXTURE0);
    renderdata->glBindTexture(data->texture_type, data->texture);
    renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_MIN_FILTER, scaleMode);
    renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_MAG_FILTER, scaleMode);
    renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    if (texture->format != SDL_PIXELFORMAT_EXTERNAL_OES) {
        renderdata->glTexImage2D(data->texture_type, 0, format, texture->w, texture->h, 0, format, type, NULL);
        if (GL_CheckError("glTexImage2D()", renderer) < 0) {
            return -1;
        }
    }

    if (texture->access == SDL_TEXTUREACCESS_TARGET) {
       data->fbo = GLES2_GetFBO(renderer->driverdata, texture->w, texture->h);
    } else {
       data->fbo = NULL;
    }

    return GL_CheckError("", renderer);
}

static int
GLES2_TexSubImage2D(GLES2_DriverContext *data, GLenum target, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, const GLvoid *pixels, GLint pitch, GLint bpp)
{
    Uint8 *blob = NULL;
    Uint8 *src;
    int src_pitch;
    int y;

    if ((width == 0) || (height == 0) || (bpp == 0)) {
        return 0;  /* nothing to do */
    }

    /* Reformat the texture data into a tightly packed array */
    src_pitch = width * bpp;
    src = (Uint8 *)pixels;
    if (pitch != src_pitch) {
        blob = (Uint8 *)SDL_malloc(src_pitch * height);
        if (!blob) {
            return SDL_OutOfMemory();
        }
        src = blob;
        for (y = 0; y < height; ++y)
        {
            SDL_memcpy(src, pixels, src_pitch);
            src += src_pitch;
            pixels = (Uint8 *)pixels + pitch;
        }
        src = blob;
    }

    data->glTexSubImage2D(target, 0, xoffset, yoffset, width, height, format, type, src);
    if (blob) {
        SDL_free(blob);
    }
    return 0;
}

static int
GLES2_UpdateTexture(SDL_Renderer *renderer, SDL_Texture *texture, const SDL_Rect *rect,
                    const void *pixels, int pitch)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;
    GLES2_TextureData *tdata = (GLES2_TextureData *)texture->driverdata;

    GLES2_ActivateRenderer(renderer);

    /* Bail out if we're supposed to update an empty rectangle */
    if (rect->w <= 0 || rect->h <= 0) {
        return 0;
    }

    /* Create a texture subimage with the supplied data */
    data->glBindTexture(tdata->texture_type, tdata->texture);
    GLES2_TexSubImage2D(data, tdata->texture_type,
                    rect->x,
                    rect->y,
                    rect->w,
                    rect->h,
                    tdata->pixel_format,
                    tdata->pixel_type,
                    pixels, pitch, SDL_BYTESPERPIXEL(texture->format));

    if (tdata->yuv) {
        /* Skip to the correct offset into the next texture */
        pixels = (const void*)((const Uint8*)pixels + rect->h * pitch);
        if (texture->format == SDL_PIXELFORMAT_YV12) {
            data->glBindTexture(tdata->texture_type, tdata->texture_v);
        } else {
            data->glBindTexture(tdata->texture_type, tdata->texture_u);
        }
        GLES2_TexSubImage2D(data, tdata->texture_type,
                rect->x / 2,
                rect->y / 2,
                (rect->w + 1) / 2,
                (rect->h + 1) / 2,
                tdata->pixel_format,
                tdata->pixel_type,
                pixels, (pitch + 1) / 2, 1);


        /* Skip to the correct offset into the next texture */
        pixels = (const void*)((const Uint8*)pixels + ((rect->h + 1) / 2) * ((pitch + 1)/2));
        if (texture->format == SDL_PIXELFORMAT_YV12) {
            data->glBindTexture(tdata->texture_type, tdata->texture_u);
        } else {
            data->glBindTexture(tdata->texture_type, tdata->texture_v);
        }
        GLES2_TexSubImage2D(data, tdata->texture_type,
                rect->x / 2,
                rect->y / 2,
                (rect->w + 1) / 2,
                (rect->h + 1) / 2,
                tdata->pixel_format,
                tdata->pixel_type,
                pixels, (pitch + 1) / 2, 1);
    }

    if (tdata->nv12) {
        /* Skip to the correct offset into the next texture */
        pixels = (const void*)((const Uint8*)pixels + rect->h * pitch);
        data->glBindTexture(tdata->texture_type, tdata->texture_u);
        GLES2_TexSubImage2D(data, tdata->texture_type,
                rect->x / 2,
                rect->y / 2,
                (rect->w + 1) / 2,
                (rect->h + 1) / 2,
                GL_LUMINANCE_ALPHA,
                GL_UNSIGNED_BYTE,
                pixels, 2 * ((pitch + 1) / 2), 2);
    }

    return GL_CheckError("glTexSubImage2D()", renderer);
}

static int
GLES2_UpdateTextureYUV(SDL_Renderer * renderer, SDL_Texture * texture,
                    const SDL_Rect * rect,
                    const Uint8 *Yplane, int Ypitch,
                    const Uint8 *Uplane, int Upitch,
                    const Uint8 *Vplane, int Vpitch)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;
    GLES2_TextureData *tdata = (GLES2_TextureData *)texture->driverdata;

    GLES2_ActivateRenderer(renderer);

    /* Bail out if we're supposed to update an empty rectangle */
    if (rect->w <= 0 || rect->h <= 0) {
        return 0;
    }

    data->glBindTexture(tdata->texture_type, tdata->texture_v);
    GLES2_TexSubImage2D(data, tdata->texture_type,
                    rect->x / 2,
                    rect->y / 2,
                    (rect->w + 1) / 2,
                    (rect->h + 1) / 2,
                    tdata->pixel_format,
                    tdata->pixel_type,
                    Vplane, Vpitch, 1);

    data->glBindTexture(tdata->texture_type, tdata->texture_u);
    GLES2_TexSubImage2D(data, tdata->texture_type,
                    rect->x / 2,
                    rect->y / 2,
                    (rect->w + 1) / 2,
                    (rect->h + 1) / 2,
                    tdata->pixel_format,
                    tdata->pixel_type,
                    Uplane, Upitch, 1);

    data->glBindTexture(tdata->texture_type, tdata->texture);
    GLES2_TexSubImage2D(data, tdata->texture_type,
                    rect->x,
                    rect->y,
                    rect->w,
                    rect->h,
                    tdata->pixel_format,
                    tdata->pixel_type,
                    Yplane, Ypitch, 1);

    return GL_CheckError("glTexSubImage2D()", renderer);
}

static int
GLES2_LockTexture(SDL_Renderer *renderer, SDL_Texture *texture, const SDL_Rect *rect,
                  void **pixels, int *pitch)
{
    GLES2_TextureData *tdata = (GLES2_TextureData *)texture->driverdata;

    /* Retrieve the buffer/pitch for the specified region */
    *pixels = (Uint8 *)tdata->pixel_data +
              (tdata->pitch * rect->y) +
              (rect->x * SDL_BYTESPERPIXEL(texture->format));
    *pitch = tdata->pitch;

    return 0;
}

static void
GLES2_UnlockTexture(SDL_Renderer *renderer, SDL_Texture *texture)
{
    GLES2_TextureData *tdata = (GLES2_TextureData *)texture->driverdata;
    SDL_Rect rect;

    /* We do whole texture updates, at least for now */
    rect.x = 0;
    rect.y = 0;
    rect.w = texture->w;
    rect.h = texture->h;
    GLES2_UpdateTexture(renderer, texture, &rect, tdata->pixel_data, tdata->pitch);
}

static int
GLES2_SetRenderTarget(SDL_Renderer * renderer, SDL_Texture * texture)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *) renderer->driverdata;
    GLES2_TextureData *texturedata = NULL;
    GLenum status;

    if (texture == NULL) {
        data->glBindFramebuffer(GL_FRAMEBUFFER, data->window_framebuffer);
    } else {
        texturedata = (GLES2_TextureData *) texture->driverdata;
        data->glBindFramebuffer(GL_FRAMEBUFFER, texturedata->fbo->FBO);
        /* TODO: check if texture pixel format allows this operation */
        data->glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, texturedata->texture_type, texturedata->texture, 0);
        /* Check FBO status */
        status = data->glCheckFramebufferStatus(GL_FRAMEBUFFER);
        if (status != GL_FRAMEBUFFER_COMPLETE) {
            return SDL_SetError("glFramebufferTexture2D() failed");
        }
    }
    return 0;
}

static void
GLES2_DestroyTexture(SDL_Renderer *renderer, SDL_Texture *texture)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;
    GLES2_TextureData *tdata = (GLES2_TextureData *)texture->driverdata;

    GLES2_ActivateRenderer(renderer);

    /* Destroy the texture */
    if (tdata) {
        data->glDeleteTextures(1, &tdata->texture);
        if (tdata->texture_v) {
            data->glDeleteTextures(1, &tdata->texture_v);
        }
        if (tdata->texture_u) {
            data->glDeleteTextures(1, &tdata->texture_u);
        }
        SDL_free(tdata->pixel_data);
        SDL_free(tdata);
        texture->driverdata = NULL;
    }
}

/*************************************************************************************************
 * Shader management functions                                                                   *
 *************************************************************************************************/

static GLES2_ShaderCacheEntry *GLES2_CacheShader(SDL_Renderer *renderer, GLES2_ShaderType type);
static void GLES2_EvictShader(SDL_Renderer *renderer, GLES2_ShaderCacheEntry *entry);
static GLES2_ProgramCacheEntry *GLES2_CacheProgram(SDL_Renderer *renderer,
                                                   GLES2_ShaderCacheEntry *vertex,
                                                   GLES2_ShaderCacheEntry *fragment);
static int GLES2_SelectProgram(SDL_Renderer *renderer, GLES2_ImageSource source, int w, int h);

static GLES2_ProgramCacheEntry *
GLES2_CacheProgram(SDL_Renderer *renderer, GLES2_ShaderCacheEntry *vertex,
GLES2_CacheProgram(GLES2_RenderData *data, GLES2_ShaderCacheEntry *vertex,
                   GLES2_ShaderCacheEntry *fragment)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;
    GLES2_ProgramCacheEntry *entry;
    GLES2_ShaderCacheEntry *shaderEntry;
    GLint linkSuccessful;
@@ -1029,21 +481,27 @@
        data->glGetUniformLocation(entry->id, "u_texture_u");
    entry->uniform_locations[GLES2_UNIFORM_TEXTURE] =
        data->glGetUniformLocation(entry->id, "u_texture");
    entry->uniform_locations[GLES2_UNIFORM_MODULATION] =
        data->glGetUniformLocation(entry->id, "u_modulation");
    entry->uniform_locations[GLES2_UNIFORM_COLOR] =
        data->glGetUniformLocation(entry->id, "u_color");

    entry->modulation_r = entry->modulation_g = entry->modulation_b = entry->modulation_a = 255;
    entry->color_r = entry->color_g = entry->color_b = entry->color_a = 255;
    entry->color = 0;

    data->glUseProgram(entry->id);
    data->glUniform1i(entry->uniform_locations[GLES2_UNIFORM_TEXTURE_V], 2);  /* always texture unit 2. */
    data->glUniform1i(entry->uniform_locations[GLES2_UNIFORM_TEXTURE_U], 1);  /* always texture unit 1. */
    data->glUniform1i(entry->uniform_locations[GLES2_UNIFORM_TEXTURE], 0);  /* always texture unit 0. */
    data->glUniformMatrix4fv(entry->uniform_locations[GLES2_UNIFORM_PROJECTION], 1, GL_FALSE, (GLfloat *)entry->projection);
    data->glUniform4f(entry->uniform_locations[GLES2_UNIFORM_MODULATION], 1.0f, 1.0f, 1.0f, 1.0f);
    data->glUniform4f(entry->uniform_locations[GLES2_UNIFORM_COLOR], 1.0f, 1.0f, 1.0f, 1.0f);
    if (entry->uniform_locations[GLES2_UNIFORM_TEXTURE_V] != -1) {
        data->glUniform1i(entry->uniform_locations[GLES2_UNIFORM_TEXTURE_V], 2);  /* always texture unit 2. */
    }
    if (entry->uniform_locations[GLES2_UNIFORM_TEXTURE_U] != -1) {
        data->glUniform1i(entry->uniform_locations[GLES2_UNIFORM_TEXTURE_U], 1);  /* always texture unit 1. */
    }
    if (entry->uniform_locations[GLES2_UNIFORM_TEXTURE] != -1) {
        data->glUniform1i(entry->uniform_locations[GLES2_UNIFORM_TEXTURE], 0);  /* always texture unit 0. */
    }
    if (entry->uniform_locations[GLES2_UNIFORM_PROJECTION] != -1) {
        data->glUniformMatrix4fv(entry->uniform_locations[GLES2_UNIFORM_PROJECTION], 1, GL_FALSE, (GLfloat *)entry->projection);
    }
    if (entry->uniform_locations[GLES2_UNIFORM_COLOR] != -1) {
        data->glUniform4f(entry->uniform_locations[GLES2_UNIFORM_COLOR], 0.0f, 0.0f, 0.0f, 0.0f);
    }

    /* Cache the linked program */
    if (data->program_cache.head) {
@@ -1063,25 +521,26 @@
    if (data->program_cache.count > GLES2_MAX_CACHED_PROGRAMS) {
        shaderEntry = data->program_cache.tail->vertex_shader;
        if (--shaderEntry->references <= 0) {
            GLES2_EvictShader(renderer, shaderEntry);
            GLES2_EvictShader(data, shaderEntry);
        }
        shaderEntry = data->program_cache.tail->fragment_shader;
        if (--shaderEntry->references <= 0) {
            GLES2_EvictShader(renderer, shaderEntry);
            GLES2_EvictShader(data, shaderEntry);
        }
        data->glDeleteProgram(data->program_cache.tail->id);
        data->program_cache.tail = data->program_cache.tail->prev;
        SDL_free(data->program_cache.tail->next);
        data->program_cache.tail->next = NULL;
        if (data->program_cache.tail != NULL) {
            SDL_free(data->program_cache.tail->next);
            data->program_cache.tail->next = NULL;
        }
        --data->program_cache.count;
    }
    return entry;
}

static GLES2_ShaderCacheEntry *
GLES2_CacheShader(SDL_Renderer *renderer, GLES2_ShaderType type)
GLES2_CacheShader(GLES2_RenderData *data, GLES2_ShaderType type)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;
    const GLES2_Shader *shader;
    const GLES2_ShaderInstance *instance = NULL;
    GLES2_ShaderCacheEntry *entry = NULL;
@@ -1144,19 +603,20 @@
        compileSuccessful = GL_TRUE;
    }
    if (!compileSuccessful) {
        SDL_bool isstack = SDL_FALSE;
        char *info = NULL;
        int length = 0;

        data->glGetShaderiv(entry->id, GL_INFO_LOG_LENGTH, &length);
        if (length > 0) {
            info = SDL_stack_alloc(char, length);
            info = SDL_small_alloc(char, length, &isstack);
            if (info) {
                data->glGetShaderInfoLog(entry->id, length, &length, info);
            }
        }
        if (info) {
            SDL_SetError("Failed to load the shader: %s", info);
            SDL_stack_free(info);
            SDL_small_free(info, isstack);
        } else {
            SDL_SetError("Failed to load the shader");
        }
@@ -1175,32 +635,9 @@
    return entry;
}

static void
GLES2_EvictShader(SDL_Renderer *renderer, GLES2_ShaderCacheEntry *entry)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;

    /* Unlink the shader from the cache */
    if (entry->next) {
        entry->next->prev = entry->prev;
    }
    if (entry->prev) {
        entry->prev->next = entry->next;
    }
    if (data->shader_cache.head == entry) {
        data->shader_cache.head = entry->next;
    }
    --data->shader_cache.count;

    /* Deallocate the shader */
    data->glDeleteShader(entry->id);
    SDL_free(entry);
}

static int
GLES2_SelectProgram(SDL_Renderer *renderer, GLES2_ImageSource source, int w, int h)
GLES2_SelectProgram(GLES2_RenderData *data, GLES2_ImageSource source, int w, int h)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;
    GLES2_ShaderCacheEntry *vertex = NULL;
    GLES2_ShaderCacheEntry *fragment = NULL;
    GLES2_ShaderType vtype, ftype;
@@ -1280,24 +717,24 @@
    }

    /* Load the requested shaders */
    vertex = GLES2_CacheShader(renderer, vtype);
    vertex = GLES2_CacheShader(data, vtype);
    if (!vertex) {
        goto fault;
    }
    fragment = GLES2_CacheShader(renderer, ftype);
    fragment = GLES2_CacheShader(data, ftype);
    if (!fragment) {
        goto fault;
    }

    /* Check if we need to change programs at all */
    if (data->current_program &&
        data->current_program->vertex_shader == vertex &&
        data->current_program->fragment_shader == fragment) {
    if (data->drawstate.program &&
        data->drawstate.program->vertex_shader == vertex &&
        data->drawstate.program->fragment_shader == fragment) {
        return 0;
    }

    /* Generate a matching program */
    program = GLES2_CacheProgram(renderer, vertex, fragment);
    program = GLES2_CacheProgram(data, vertex, fragment);
    if (!program) {
        goto fault;
    }
@@ -1306,361 +743,352 @@
    data->glUseProgram(program->id);

    /* Set the current program */
    data->current_program = program;

    /* Activate an orthographic projection */
    if (GLES2_SetOrthographicProjection(renderer) < 0) {
        goto fault;
    }
    data->drawstate.program = program;

    /* Clean up and return */
    return 0;
fault:
    if (vertex && vertex->references <= 0) {
        GLES2_EvictShader(renderer, vertex);
        GLES2_EvictShader(data, vertex);
    }
    if (fragment && fragment->references <= 0) {
        GLES2_EvictShader(renderer, fragment);
        GLES2_EvictShader(data, fragment);
    }
    data->current_program = NULL;
    data->drawstate.program = NULL;
    return -1;
}

static int
GLES2_SetOrthographicProjection(SDL_Renderer *renderer)
GLES2_QueueSetViewport(SDL_Renderer * renderer, SDL_RenderCommand *cmd)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;
    GLfloat projection[4][4];

    if (!renderer->viewport.w || !renderer->viewport.h) {
        return 0;
    }

    /* Prepare an orthographic projection */
    projection[0][0] = 2.0f / renderer->viewport.w;
    projection[0][1] = 0.0f;
    projection[0][2] = 0.0f;
    projection[0][3] = 0.0f;
    projection[1][0] = 0.0f;
    if (renderer->target) {
        projection[1][1] = 2.0f / renderer->viewport.h;
    } else {
        projection[1][1] = -2.0f / renderer->viewport.h;
    }
    projection[1][2] = 0.0f;
    projection[1][3] = 0.0f;
    projection[2][0] = 0.0f;
    projection[2][1] = 0.0f;
    projection[2][2] = 0.0f;
    projection[2][3] = 0.0f;
    projection[3][0] = -1.0f;
    if (renderer->target) {
        projection[3][1] = -1.0f;
    } else {
        projection[3][1] = 1.0f;
    }
    projection[3][2] = 0.0f;
    projection[3][3] = 1.0f;

    /* Set the projection matrix */
    if (SDL_memcmp(data->current_program->projection, projection, sizeof (projection)) != 0) {
        const GLuint locProjection = data->current_program->uniform_locations[GLES2_UNIFORM_PROJECTION];
        data->glUniformMatrix4fv(locProjection, 1, GL_FALSE, (GLfloat *)projection);
        SDL_memcpy(data->current_program->projection, projection, sizeof (projection));
    }

    return 0;
}

/*************************************************************************************************
 * Rendering functions                                                                           *
 *************************************************************************************************/

static const float inv255f = 1.0f / 255.0f;

static int GLES2_RenderClear(SDL_Renderer *renderer);
static int GLES2_RenderDrawPoints(SDL_Renderer *renderer, const SDL_FPoint *points, int count);
static int GLES2_RenderDrawLines(SDL_Renderer *renderer, const SDL_FPoint *points, int count);
static int GLES2_RenderFillRects(SDL_Renderer *renderer, const SDL_FRect *rects, int count);
static int GLES2_RenderCopy(SDL_Renderer *renderer, SDL_Texture *texture, const SDL_Rect *srcrect,
                            const SDL_FRect *dstrect);
static int GLES2_RenderCopyEx(SDL_Renderer * renderer, SDL_Texture * texture,
                         const SDL_Rect * srcrect, const SDL_FRect * dstrect,
                         const double angle, const SDL_FPoint *center, const SDL_RendererFlip flip);
static int GLES2_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
                    Uint32 pixel_format, void * pixels, int pitch);
static void GLES2_RenderPresent(SDL_Renderer *renderer);

static SDL_bool
CompareColors(Uint8 r1, Uint8 g1, Uint8 b1, Uint8 a1,
              Uint8 r2, Uint8 g2, Uint8 b2, Uint8 a2)
{
    Uint32 Pixel1, Pixel2;
    RGBA8888_FROM_RGBA(Pixel1, r1, g1, b1, a1);
    RGBA8888_FROM_RGBA(Pixel2, r2, g2, b2, a2);
    return (Pixel1 == Pixel2);
    return 0;  /* nothing to do in this backend. */
}

static int
GLES2_RenderClear(SDL_Renderer * renderer)
GLES2_QueueDrawPoints(SDL_Renderer * renderer, SDL_RenderCommand *cmd, const SDL_FPoint * points, int count)
{
    Uint8 r, g, b, a;
    GLfloat *verts = (GLfloat *) SDL_AllocateRenderVertices(renderer, count * 2 * sizeof (GLfloat), 0, &cmd->data.draw.first);
    int i;

    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;

    GLES2_ActivateRenderer(renderer);

    if (!CompareColors(data->clear_r, data->clear_g, data->clear_b, data->clear_a,
                        renderer->r, renderer->g, renderer->b, renderer->a)) {

       /* Select the color to clear with */
       g = renderer->g;
       a = renderer->a;
   
       if (renderer->target &&
            (renderer->target->format == SDL_PIXELFORMAT_ARGB8888 ||
             renderer->target->format == SDL_PIXELFORMAT_RGB888)) {
           r = renderer->b;
           b = renderer->r;
        } else {
           r = renderer->r;
           b = renderer->b;
        }

        data->glClearColor((GLfloat) r * inv255f,
                     (GLfloat) g * inv255f,
                     (GLfloat) b * inv255f,
                     (GLfloat) a * inv255f);
        data->clear_r = renderer->r;
        data->clear_g = renderer->g;
        data->clear_b = renderer->b;
        data->clear_a = renderer->a;
    if (!verts) {
        return -1;
    }

    if (renderer->clipping_enabled) {
        data->glDisable(GL_SCISSOR_TEST);
    }

    data->glClear(GL_COLOR_BUFFER_BIT);

    if (renderer->clipping_enabled) {
        data->glEnable(GL_SCISSOR_TEST);
    cmd->data.draw.count = count;
    for (i = 0; i < count; i++) {
        *(verts++) = 0.5f + points[i].x;
        *(verts++) = 0.5f + points[i].y;
    }

    return 0;
}

static void
GLES2_SetBlendMode(GLES2_DriverContext *data, SDL_BlendMode blendMode)
static int
GLES2_QueueFillRects(SDL_Renderer * renderer, SDL_RenderCommand *cmd, const SDL_FRect * rects, int count)
{
    if (blendMode != data->current.blendMode) {
        if (blendMode == SDL_BLENDMODE_NONE) {
    GLfloat *verts = (GLfloat *) SDL_AllocateRenderVertices(renderer, count * 8 * sizeof (GLfloat), 0, &cmd->data.draw.first);
    int i;

    if (!verts) {
        return -1;
    }

    cmd->data.draw.count = count;

    for (i = 0; i < count; i++) {
        const SDL_FRect *rect = &rects[i];
        const GLfloat minx = rect->x;
        const GLfloat maxx = rect->x + rect->w;
        const GLfloat miny = rect->y;
        const GLfloat maxy = rect->y + rect->h;
        *(verts++) = minx;
        *(verts++) = miny;
        *(verts++) = maxx;
        *(verts++) = miny;
        *(verts++) = minx;
        *(verts++) = maxy;
        *(verts++) = maxx;
        *(verts++) = maxy;
    }

    return 0;
}

static int
GLES2_QueueCopy(SDL_Renderer * renderer, SDL_RenderCommand *cmd, SDL_Texture * texture,
                          const SDL_Rect * srcrect, const SDL_FRect * dstrect)
{
    GLfloat minx, miny, maxx, maxy;
    GLfloat minu, maxu, minv, maxv;
    GLfloat *verts = (GLfloat *) SDL_AllocateRenderVertices(renderer, 16 * sizeof (GLfloat), 0, &cmd->data.draw.first);

    if (!verts) {
        return -1;
    }

    cmd->data.draw.count = 1;

    minx = dstrect->x;
    miny = dstrect->y;
    maxx = dstrect->x + dstrect->w;
    maxy = dstrect->y + dstrect->h;

    minu = (GLfloat) srcrect->x / texture->w;
    maxu = (GLfloat) (srcrect->x + srcrect->w) / texture->w;
    minv = (GLfloat) srcrect->y / texture->h;
    maxv = (GLfloat) (srcrect->y + srcrect->h) / texture->h;

    *(verts++) = minx;
    *(verts++) = miny;
    *(verts++) = maxx;
    *(verts++) = miny;
    *(verts++) = minx;
    *(verts++) = maxy;
    *(verts++) = maxx;
    *(verts++) = maxy;

    *(verts++) = minu;
    *(verts++) = minv;
    *(verts++) = maxu;
    *(verts++) = minv;
    *(verts++) = minu;
    *(verts++) = maxv;
    *(verts++) = maxu;
    *(verts++) = maxv;

    return 0;
}

static int
GLES2_QueueCopyEx(SDL_Renderer * renderer, SDL_RenderCommand *cmd, SDL_Texture * texture,
                        const SDL_Rect * srcquad, const SDL_FRect * dstrect,
                        const double angle, const SDL_FPoint *center, const SDL_RendererFlip flip)
{
    /* render expects cos value - 1 (see GLES2_VertexSrc_Default_) */
    const float radian_angle = (float)(M_PI * (360.0 - angle) / 180.0);
    const GLfloat s = (GLfloat) SDL_sin(radian_angle);
    const GLfloat c = (GLfloat) SDL_cos(radian_angle) - 1.0f;
    const GLfloat centerx = center->x + dstrect->x;
    const GLfloat centery = center->y + dstrect->y;
    GLfloat minx, miny, maxx, maxy;
    GLfloat minu, maxu, minv, maxv;
    GLfloat *verts = (GLfloat *) SDL_AllocateRenderVertices(renderer, 32 * sizeof (GLfloat), 0, &cmd->data.draw.first);

    if (!verts) {
        return -1;
    }

    if (flip & SDL_FLIP_HORIZONTAL) {
        minx = dstrect->x + dstrect->w;
        maxx = dstrect->x;
    } else {
        minx = dstrect->x;
        maxx = dstrect->x + dstrect->w;
    }

    if (flip & SDL_FLIP_VERTICAL) {
        miny = dstrect->y + dstrect->h;
        maxy = dstrect->y;
    } else {
        miny = dstrect->y;
        maxy = dstrect->y + dstrect->h;
    }

    minu = ((GLfloat) srcquad->x) / ((GLfloat) texture->w);
    maxu = ((GLfloat) (srcquad->x + srcquad->w)) / ((GLfloat) texture->w);
    minv = ((GLfloat) srcquad->y) / ((GLfloat) texture->h);
    maxv = ((GLfloat) (srcquad->y + srcquad->h)) / ((GLfloat) texture->h);


    cmd->data.draw.count = 1;

    *(verts++) = minx;
    *(verts++) = miny;
    *(verts++) = maxx;
    *(verts++) = miny;
    *(verts++) = minx;
    *(verts++) = maxy;
    *(verts++) = maxx;
    *(verts++) = maxy;

    *(verts++) = minu;
    *(verts++) = minv;
    *(verts++) = maxu;
    *(verts++) = minv;
    *(verts++) = minu;
    *(verts++) = maxv;
    *(verts++) = maxu;
    *(verts++) = maxv;

    *(verts++) = s;
    *(verts++) = c;
    *(verts++) = s;
    *(verts++) = c;
    *(verts++) = s;
    *(verts++) = c;
    *(verts++) = s;
    *(verts++) = c;

    *(verts++) = centerx;
    *(verts++) = centery;
    *(verts++) = centerx;
    *(verts++) = centery;
    *(verts++) = centerx;
    *(verts++) = centery;
    *(verts++) = centerx;
    *(verts++) = centery;

    return 0;
}

static int
SetDrawState(GLES2_RenderData *data, const SDL_RenderCommand *cmd, const GLES2_ImageSource imgsrc)
{
    const SDL_bool was_copy_ex = data->drawstate.is_copy_ex;
    const SDL_bool is_copy_ex = (cmd->command == SDL_RENDERCMD_COPY_EX);
    SDL_Texture *texture = cmd->data.draw.texture;
    const SDL_BlendMode blend = cmd->data.draw.blend;
    GLES2_ProgramCacheEntry *program;

    SDL_assert((texture != NULL) == (imgsrc != GLES2_IMAGESOURCE_SOLID));

    if (data->drawstate.viewport_dirty) {
        const SDL_Rect *viewport = &data->drawstate.viewport;
        data->glViewport(viewport->x,
                         data->drawstate.target ? viewport->y : (data->drawstate.drawableh - viewport->y - viewport->h),
                         viewport->w, viewport->h);
        if (viewport->w && viewport->h) {
            data->drawstate.projection[0][0] = 2.0f / viewport->w;
            data->drawstate.projection[1][1] = (data->drawstate.target ? 2.0f : -2.0f) / viewport->h;
            data->drawstate.projection[3][1] = data->drawstate.target ? -1.0f : 1.0f;
        }
        data->drawstate.viewport_dirty = SDL_FALSE;
    }

    if (data->drawstate.cliprect_enabled_dirty) {
        if (!data->drawstate.cliprect_enabled) {
            data->glDisable(GL_SCISSOR_TEST);
        } else {
            data->glEnable(GL_SCISSOR_TEST);
        }
        data->drawstate.cliprect_enabled_dirty = SDL_FALSE;
    }

    if (data->drawstate.cliprect_enabled && data->drawstate.cliprect_dirty) {
        const SDL_Rect *viewport = &data->drawstate.viewport;
        const SDL_Rect *rect = &data->drawstate.cliprect;
        data->glScissor(viewport->x + rect->x,
                        data->drawstate.target ? viewport->y + rect->y : data->drawstate.drawableh - viewport->y - rect->y - rect->h,
                        rect->w, rect->h);
        data->drawstate.cliprect_dirty = SDL_FALSE;
    }

    if (texture != data->drawstate.texture) {
        if ((texture != NULL) != data->drawstate.texturing) {
            if (texture == NULL) {
                data->glDisableVertexAttribArray((GLenum) GLES2_ATTRIBUTE_TEXCOORD);
                data->drawstate.texturing = SDL_FALSE;
            } else {
                data->glEnableVertexAttribArray((GLenum) GLES2_ATTRIBUTE_TEXCOORD);
                data->drawstate.texturing = SDL_TRUE;
            }
        }

        if (texture) {
            GLES2_TextureData *tdata = (GLES2_TextureData *) texture->driverdata;
            if (tdata->yuv) {
                data->glActiveTexture(GL_TEXTURE2);
                data->glBindTexture(tdata->texture_type, tdata->texture_v);

                data->glActiveTexture(GL_TEXTURE1);
                data->glBindTexture(tdata->texture_type, tdata->texture_u);

                data->glActiveTexture(GL_TEXTURE0);
            } else if (tdata->nv12) {
                data->glActiveTexture(GL_TEXTURE1);
                data->glBindTexture(tdata->texture_type, tdata->texture_u);

                data->glActiveTexture(GL_TEXTURE0);
            }
            data->glBindTexture(tdata->texture_type, tdata->texture);
        }

        data->drawstate.texture = texture;
    }

    if (texture) {
        data->glVertexAttribPointer(GLES2_ATTRIBUTE_TEXCOORD, 2, GL_FLOAT, GL_FALSE, 0, (const GLvoid *) (cmd->data.draw.first + (sizeof (GLfloat) * 8)));
    }

    if (GLES2_SelectProgram(data, imgsrc, texture ? texture->w : 0, texture ? texture->h : 0) < 0) {
        return -1;
    }

    program = data->drawstate.program;

    if (program->uniform_locations[GLES2_UNIFORM_PROJECTION] != -1) {
        if (SDL_memcmp(program->projection, data->drawstate.projection, sizeof (data->drawstate.projection)) != 0) {
            data->glUniformMatrix4fv(program->uniform_locations[GLES2_UNIFORM_PROJECTION], 1, GL_FALSE, (GLfloat *)data->drawstate.projection);
            SDL_memcpy(program->projection, data->drawstate.projection, sizeof (data->drawstate.projection));
        }
    }

    if (program->uniform_locations[GLES2_UNIFORM_COLOR] != -1) {
        if (data->drawstate.color != program->color) {
            const Uint8 r = (data->drawstate.color >> 16) & 0xFF;
            const Uint8 g = (data->drawstate.color >> 8) & 0xFF;
            const Uint8 b = (data->drawstate.color >> 0) & 0xFF;
            const Uint8 a = (data->drawstate.color >> 24) & 0xFF;
            data->glUniform4f(program->uniform_locations[GLES2_UNIFORM_COLOR], r * inv255f, g * inv255f, b * inv255f, a * inv255f);
            program->color = data->drawstate.color;
        }
    }

    if (blend != data->drawstate.blend) {
        if (blend == SDL_BLENDMODE_NONE) {
            data->glDisable(GL_BLEND);
        } else {
            data->glEnable(GL_BLEND);
            data->glBlendFuncSeparate(GetBlendFunc(SDL_GetBlendModeSrcColorFactor(blendMode)),
                                      GetBlendFunc(SDL_GetBlendModeDstColorFactor(blendMode)),
                                      GetBlendFunc(SDL_GetBlendModeSrcAlphaFactor(blendMode)),
                                      GetBlendFunc(SDL_GetBlendModeDstAlphaFactor(blendMode)));
            data->glBlendEquationSeparate(GetBlendEquation(SDL_GetBlendModeColorOperation(blendMode)),
                                          GetBlendEquation(SDL_GetBlendModeAlphaOperation(blendMode)));
            data->glBlendFuncSeparate(GetBlendFunc(SDL_GetBlendModeSrcColorFactor(blend)),
                                      GetBlendFunc(SDL_GetBlendModeDstColorFactor(blend)),
                                      GetBlendFunc(SDL_GetBlendModeSrcAlphaFactor(blend)),
                                      GetBlendFunc(SDL_GetBlendModeDstAlphaFactor(blend)));
            data->glBlendEquationSeparate(GetBlendEquation(SDL_GetBlendModeColorOperation(blend)),
                                          GetBlendEquation(SDL_GetBlendModeAlphaOperation(blend)));
        }
        data->current.blendMode = blendMode;
        data->drawstate.blend = blend;
    }
}

static void
GLES2_SetTexCoords(GLES2_DriverContext * data, SDL_bool enabled)
{
    if (enabled != data->current.tex_coords) {
        if (enabled) {
            data->glEnableVertexAttribArray(GLES2_ATTRIBUTE_TEXCOORD);
    /* all drawing commands use this */
    data->glVertexAttribPointer(GLES2_ATTRIBUTE_POSITION, 2, GL_FLOAT, GL_FALSE, 0, (const GLvoid *) cmd->data.draw.first);

    if (is_copy_ex != was_copy_ex) {
        if (is_copy_ex) {
            data->glEnableVertexAttribArray((GLenum) GLES2_ATTRIBUTE_ANGLE);
            data->glEnableVertexAttribArray((GLenum) GLES2_ATTRIBUTE_CENTER);
        } else {
            data->glDisableVertexAttribArray(GLES2_ATTRIBUTE_TEXCOORD);
            data->glDisableVertexAttribArray((GLenum) GLES2_ATTRIBUTE_ANGLE);
            data->glDisableVertexAttribArray((GLenum) GLES2_ATTRIBUTE_CENTER);
        }
        data->current.tex_coords = enabled;
    }
}

static int
GLES2_SetDrawingState(SDL_Renderer * renderer)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;
    GLES2_ProgramCacheEntry *program;
    Uint8 r, g, b, a;

    GLES2_ActivateRenderer(renderer);

    GLES2_SetBlendMode(data, renderer->blendMode);

    GLES2_SetTexCoords(data, SDL_FALSE);

    /* Activate an appropriate shader and set the projection matrix */
    if (GLES2_SelectProgram(renderer, GLES2_IMAGESOURCE_SOLID, 0, 0) < 0) {
        return -1;
        data->drawstate.is_copy_ex = is_copy_ex;
    }

    /* Select the color to draw with */
    g = renderer->g;
    a = renderer->a;

    if (renderer->target &&
         (renderer->target->format == SDL_PIXELFORMAT_ARGB8888 ||
         renderer->target->format == SDL_PIXELFORMAT_RGB888)) {
        r = renderer->b;
        b = renderer->r;
     } else {
        r = renderer->r;
        b = renderer->b;
     }

    program = data->current_program;
    if (!CompareColors(program->color_r, program->color_g, program->color_b, program->color_a, r, g, b, a)) {
        /* Select the color to draw with */
        data->glUniform4f(program->uniform_locations[GLES2_UNIFORM_COLOR], r * inv255f, g * inv255f, b * inv255f, a * inv255f);
        program->color_r = r;
        program->color_g = g;
        program->color_b = b;
        program->color_a = a;
    if (is_copy_ex) {
        data->glVertexAttribPointer(GLES2_ATTRIBUTE_ANGLE, 2, GL_FLOAT, GL_FALSE, 0, (const GLvoid *) (cmd->data.draw.first + (sizeof (GLfloat) * 16)));
        data->glVertexAttribPointer(GLES2_ATTRIBUTE_CENTER, 2, GL_FLOAT, GL_FALSE, 0, (const GLvoid *) (cmd->data.draw.first + (sizeof (GLfloat) * 24)));
    }

    return 0;
}

static int
GLES2_UpdateVertexBuffer(SDL_Renderer *renderer, GLES2_Attribute attr,
                         const void *vertexData, size_t dataSizeInBytes)
SetCopyState(SDL_Renderer *renderer, const SDL_RenderCommand *cmd)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;

#if !SDL_GLES2_USE_VBOS
    data->glVertexAttribPointer(attr, 2, GL_FLOAT, GL_FALSE, 0, vertexData);
#else
    if (!data->vertex_buffers[attr]) {
        data->glGenBuffers(1, &data->vertex_buffers[attr]);
    }

    data->glBindBuffer(GL_ARRAY_BUFFER, data->vertex_buffers[attr]);

    if (data->vertex_buffer_size[attr] < dataSizeInBytes) {
        data->glBufferData(GL_ARRAY_BUFFER, dataSizeInBytes, vertexData, GL_STREAM_DRAW);
        data->vertex_buffer_size[attr] = dataSizeInBytes;
    } else {
        data->glBufferSubData(GL_ARRAY_BUFFER, 0, dataSizeInBytes, vertexData);
    }

    data->glVertexAttribPointer(attr, 2, GL_FLOAT, GL_FALSE, 0, 0);
#endif

    return 0;
}

static int
GLES2_RenderDrawPoints(SDL_Renderer *renderer, const SDL_FPoint *points, int count)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;
    GLfloat *vertices;
    int idx;

    if (GLES2_SetDrawingState(renderer) < 0) {
        return -1;
    }

    /* Emit the specified vertices as points */
    vertices = SDL_stack_alloc(GLfloat, count * 2);
    for (idx = 0; idx < count; ++idx) {
        GLfloat x = points[idx].x + 0.5f;
        GLfloat y = points[idx].y + 0.5f;

        vertices[idx * 2] = x;
        vertices[(idx * 2) + 1] = y;
    }
    /*data->glVertexAttribPointer(GLES2_ATTRIBUTE_POSITION, 2, GL_FLOAT, GL_FALSE, 0, vertices);*/
    GLES2_UpdateVertexBuffer(renderer, GLES2_ATTRIBUTE_POSITION, vertices, count * 2 * sizeof(GLfloat));
    data->glDrawArrays(GL_POINTS, 0, count);
    SDL_stack_free(vertices);
    return 0;
}

static int
GLES2_RenderDrawLines(SDL_Renderer *renderer, const SDL_FPoint *points, int count)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;
    GLfloat *vertices;
    int idx;

    if (GLES2_SetDrawingState(renderer) < 0) {
        return -1;
    }

    /* Emit a line strip including the specified vertices */
    vertices = SDL_stack_alloc(GLfloat, count * 2);
    for (idx = 0; idx < count; ++idx) {
        GLfloat x = points[idx].x + 0.5f;
        GLfloat y = points[idx].y + 0.5f;

        vertices[idx * 2] = x;
        vertices[(idx * 2) + 1] = y;
    }
    /*data->glVertexAttribPointer(GLES2_ATTRIBUTE_POSITION, 2, GL_FLOAT, GL_FALSE, 0, vertices);*/
    GLES2_UpdateVertexBuffer(renderer, GLES2_ATTRIBUTE_POSITION, vertices, count * 2 * sizeof(GLfloat));
    data->glDrawArrays(GL_LINE_STRIP, 0, count);

    /* We need to close the endpoint of the line */
    if (count == 2 ||
        points[0].x != points[count-1].x || points[0].y != points[count-1].y) {
        data->glDrawArrays(GL_POINTS, count-1, 1);
    }
    SDL_stack_free(vertices);

    return GL_CheckError("", renderer);
}

static int
GLES2_RenderFillRects(SDL_Renderer *renderer, const SDL_FRect *rects, int count)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;
    GLfloat vertices[8];
    int idx;

    if (GLES2_SetDrawingState(renderer) < 0) {
        return -1;
    }

    /* Emit a line loop for each rectangle */
    for (idx = 0; idx < count; ++idx) {
        const SDL_FRect *rect = &rects[idx];

        GLfloat xMin = rect->x;
        GLfloat xMax = (rect->x + rect->w);
        GLfloat yMin = rect->y;
        GLfloat yMax = (rect->y + rect->h);

        vertices[0] = xMin;
        vertices[1] = yMin;
        vertices[2] = xMax;
        vertices[3] = yMin;
        vertices[4] = xMin;
        vertices[5] = yMax;
        vertices[6] = xMax;
        vertices[7] = yMax;
        /*data->glVertexAttribPointer(GLES2_ATTRIBUTE_POSITION, 2, GL_FLOAT, GL_FALSE, 0, vertices);*/
        GLES2_UpdateVertexBuffer(renderer, GLES2_ATTRIBUTE_POSITION, vertices, 8 * sizeof(GLfloat));
        data->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
    }
    return GL_CheckError("", renderer);
}

static int
GLES2_SetupCopy(SDL_Renderer *renderer, SDL_Texture *texture)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;
    GLES2_TextureData *tdata = (GLES2_TextureData *)texture->driverdata;
    GLES2_RenderData *data = (GLES2_RenderData *) renderer->driverdata;
    GLES2_ImageSource sourceType = GLES2_IMAGESOURCE_TEXTURE_ABGR;
    GLES2_ProgramCacheEntry *program;
    Uint8 r, g, b, a;
    SDL_Texture *texture = cmd->data.draw.texture;

    /* Activate an appropriate shader and set the projection matrix */
    /* Pick an appropriate shader */
    if (renderer->target) {
        /* Check if we need to do color mapping between the source and render target textures */
        if (renderer->target->format != texture->format) {
@@ -1764,178 +1192,647 @@
        }
    }

    if (GLES2_SelectProgram(renderer, sourceType, texture->w, texture->h) < 0) {
    return SetDrawState(data, cmd, sourceType);
}

static int
GLES2_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertices, size_t vertsize)
{
    GLES2_RenderData *data = (GLES2_RenderData *) renderer->driverdata;
    const SDL_bool colorswap = (renderer->target && (renderer->target->format == SDL_PIXELFORMAT_ARGB8888 || renderer->target->format == SDL_PIXELFORMAT_RGB888));
    const int vboidx = data->current_vertex_buffer;
    const GLuint vbo = data->vertex_buffers[vboidx];
    size_t i;

    if (GLES2_ActivateRenderer(renderer) < 0) {
        return -1;
    }

    /* Select the target texture */
    if (tdata->yuv) {
        data->glActiveTexture(GL_TEXTURE2);
        data->glBindTexture(tdata->texture_type, tdata->texture_v);

        data->glActiveTexture(GL_TEXTURE1);
        data->glBindTexture(tdata->texture_type, tdata->texture_u);

        data->glActiveTexture(GL_TEXTURE0);
    data->drawstate.target = renderer->target;
    if (!data->drawstate.target) {
        SDL_GL_GetDrawableSize(renderer->window, &data->drawstate.drawablew, &data->drawstate.drawableh);
    }
    if (tdata->nv12) {
        data->glActiveTexture(GL_TEXTURE1);
        data->glBindTexture(tdata->texture_type, tdata->texture_u);

        data->glActiveTexture(GL_TEXTURE0);
    }
    data->glBindTexture(tdata->texture_type, tdata->texture);

    /* Configure color modulation */
    g = texture->g;
    a = texture->a;

    if (renderer->target &&
        (renderer->target->format == SDL_PIXELFORMAT_ARGB8888 ||
         renderer->target->format == SDL_PIXELFORMAT_RGB888)) {
        r = texture->b;
        b = texture->r;
    /* upload the new VBO data for this set of commands. */
    data->glBindBuffer(GL_ARRAY_BUFFER, vbo);
    if (data->vertex_buffer_size[vboidx] < vertsize) {
        data->glBufferData(GL_ARRAY_BUFFER, vertsize, vertices, GL_STREAM_DRAW);
        data->vertex_buffer_size[vboidx] = vertsize;
    } else {
        r = texture->r;
        b = texture->b;
        data->glBufferSubData(GL_ARRAY_BUFFER, 0, vertsize, vertices);
    }

    program = data->current_program;

    if (!CompareColors(program->modulation_r, program->modulation_g, program->modulation_b, program->modulation_a, r, g, b, a)) {
        data->glUniform4f(program->uniform_locations[GLES2_UNIFORM_MODULATION], r * inv255f, g * inv255f, b * inv255f, a * inv255f);
        program->modulation_r = r;
        program->modulation_g = g;
        program->modulation_b = b;
        program->modulation_a = a;
    /* cycle through a few VBOs so the GL has some time with the data before we replace it. */
    data->current_vertex_buffer++;
    if (data->current_vertex_buffer >= SDL_arraysize(data->vertex_buffers)) {
        data->current_vertex_buffer = 0;
    }

    /* Configure texture blending */
    GLES2_SetBlendMode(data, texture->blendMode);
    while (cmd) {
        switch (cmd->command) {
            case SDL_RENDERCMD_SETDRAWCOLOR: {
                const Uint8 r = colorswap ? cmd->data.color.b : cmd->data.color.r;
                const Uint8 g = cmd->data.color.g;
                const Uint8 b = colorswap ? cmd->data.color.r : cmd->data.color.b;
                const Uint8 a = cmd->data.color.a;
                data->drawstate.color = ((a << 24) | (r << 16) | (g << 8) | b);
                break;
            }

    GLES2_SetTexCoords(data, SDL_TRUE);
            case SDL_RENDERCMD_SETVIEWPORT: {
                SDL_Rect *viewport = &data->drawstate.viewport;
                if (SDL_memcmp(viewport, &cmd->data.viewport.rect, sizeof (SDL_Rect)) != 0) {
                    SDL_memcpy(viewport, &cmd->data.viewport.rect, sizeof (SDL_Rect));
                    data->drawstate.viewport_dirty = SDL_TRUE;
                }
                break;
            }

            case SDL_RENDERCMD_SETCLIPRECT: {
                const SDL_Rect *rect = &cmd->data.cliprect.rect;
                if (data->drawstate.cliprect_enabled != cmd->data.cliprect.enabled) {
                    data->drawstate.cliprect_enabled = cmd->data.cliprect.enabled;
                    data->drawstate.cliprect_enabled_dirty = SDL_TRUE;
                }

                if (SDL_memcmp(&data->drawstate.cliprect, rect, sizeof (SDL_Rect)) != 0) {
                    SDL_memcpy(&data->drawstate.cliprect, rect, sizeof (SDL_Rect));
                    data->drawstate.cliprect_dirty = SDL_TRUE;
                }
                break;
            }

            case SDL_RENDERCMD_CLEAR: {
                const Uint8 r = colorswap ? cmd->data.color.b : cmd->data.color.r;
                const Uint8 g = cmd->data.color.g;
                const Uint8 b = colorswap ? cmd->data.color.r : cmd->data.color.b;
                const Uint8 a = cmd->data.color.a;
                const Uint32 color = ((a << 24) | (r << 16) | (g << 8) | b);
                if (color != data->drawstate.clear_color) {
                    const GLfloat fr = ((GLfloat) r) * inv255f;
                    const GLfloat fg = ((GLfloat) g) * inv255f;
                    const GLfloat fb = ((GLfloat) b) * inv255f;
                    const GLfloat fa = ((GLfloat) a) * inv255f;
                    data->glClearColor(fr, fg, fb, fa);
                    data->drawstate.clear_color = color;
                }

                if (data->drawstate.cliprect_enabled || data->drawstate.cliprect_enabled_dirty) {
                    data->glDisable(GL_SCISSOR_TEST);
                    data->drawstate.cliprect_enabled_dirty = data->drawstate.cliprect_enabled;
                }

                data->glClear(GL_COLOR_BUFFER_BIT);
                break;
            }

            case SDL_RENDERCMD_DRAW_POINTS: {
                if (SetDrawState(data, cmd, GLES2_IMAGESOURCE_SOLID) == 0) {
                    data->glDrawArrays(GL_POINTS, 0, (GLsizei) cmd->data.draw.count);
                }
                break;
            }

            case SDL_RENDERCMD_DRAW_LINES: {
                const GLfloat *verts = (GLfloat *) (((Uint8 *) vertices) + cmd->data.draw.first);
                const size_t count = cmd->data.draw.count;
                if (SetDrawState(data, cmd, GLES2_IMAGESOURCE_SOLID) == 0) {
                    if (count > 2 && (verts[0] == verts[(count-1)*2]) && (verts[1] == verts[(count*2)-1])) {
                        /* GL_LINE_LOOP takes care of the final segment */
                        data->glDrawArrays(GL_LINE_LOOP, 0, (GLsizei) (count - 1));
                    } else {
                        data->glDrawArrays(GL_LINE_STRIP, 0, (GLsizei) count);
                        /* We need to close the endpoint of the line */
                        data->glDrawArrays(GL_POINTS, (GLsizei) (count - 1), 1);
                    }
                }
                break;
            }

            case SDL_RENDERCMD_FILL_RECTS: {
                const size_t count = cmd->data.draw.count;
                size_t offset = 0;
                if (SetDrawState(data, cmd, GLES2_IMAGESOURCE_SOLID) == 0) {
                    for (i = 0; i < count; ++i, offset += 4) {
                        data->glDrawArrays(GL_TRIANGLE_STRIP, (GLsizei) offset, 4);
                    }
                }
                break;
            }

            case SDL_RENDERCMD_COPY:
            case SDL_RENDERCMD_COPY_EX: {
                if (SetCopyState(renderer, cmd) == 0) {
                    data->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
                }
                break;
            }

            case SDL_RENDERCMD_NO_OP:
                break;
        }

        cmd = cmd->next;
    }

    return GL_CheckError("", renderer);
}

static void
GLES2_DestroyRenderer(SDL_Renderer *renderer)
{
    GLES2_RenderData *data = (GLES2_RenderData *)renderer->driverdata;

    /* Deallocate everything */
    if (data) {
        GLES2_ActivateRenderer(renderer);

        {
            GLES2_ShaderCacheEntry *entry;
            GLES2_ShaderCacheEntry *next;
            entry = data->shader_cache.head;
            while (entry) {
                data->glDeleteShader(entry->id);
                next = entry->next;
                SDL_free(entry);
                entry = next;
            }
        }
        {
            GLES2_ProgramCacheEntry *entry;
            GLES2_ProgramCacheEntry *next;
            entry = data->program_cache.head;
            while (entry) {
                data->glDeleteProgram(entry->id);
                next = entry->next;
                SDL_free(entry);
                entry = next;
            }
        }

        if (data->context) {
            while (data->framebuffers) {
                GLES2_FBOList *nextnode = data->framebuffers->next;
                data->glDeleteFramebuffers(1, &data->framebuffers->FBO);
                GL_CheckError("", renderer);
                SDL_free(data->framebuffers);
                data->framebuffers = nextnode;
            }

            data->glDeleteBuffers(SDL_arraysize(data->vertex_buffers), data->vertex_buffers);
            GL_CheckError("", renderer);

            SDL_GL_DeleteContext(data->context);
        }

        SDL_free(data->shader_formats);
        SDL_free(data);
    }
    SDL_free(renderer);
}

static int
GLES2_CreateTexture(SDL_Renderer *renderer, SDL_Texture *texture)
{
    GLES2_RenderData *renderdata = (GLES2_RenderData *)renderer->driverdata;
    GLES2_TextureData *data;
    GLenum format;
    GLenum type;
    GLenum scaleMode;

    GLES2_ActivateRenderer(renderer);

    renderdata->drawstate.texture = NULL;  /* we trash this state. */

    /* Determine the corresponding GLES texture format params */
    switch (texture->format)
    {
    case SDL_PIXELFORMAT_ARGB8888:
    case SDL_PIXELFORMAT_ABGR8888:
    case SDL_PIXELFORMAT_RGB888:
    case SDL_PIXELFORMAT_BGR888:
        format = GL_RGBA;
        type = GL_UNSIGNED_BYTE;
        break;
    case SDL_PIXELFORMAT_IYUV:
    case SDL_PIXELFORMAT_YV12:
    case SDL_PIXELFORMAT_NV12:
    case SDL_PIXELFORMAT_NV21:
        format = GL_LUMINANCE;
        type = GL_UNSIGNED_BYTE;
        break;
#ifdef GL_TEXTURE_EXTERNAL_OES
    case SDL_PIXELFORMAT_EXTERNAL_OES:
        format = GL_NONE;
        type = GL_NONE;
        break;
#endif
    default:
        return SDL_SetError("Texture format not supported");
    }

    if (texture->format == SDL_PIXELFORMAT_EXTERNAL_OES &&
        texture->access != SDL_TEXTUREACCESS_STATIC) {
        return SDL_SetError("Unsupported texture access for SDL_PIXELFORMAT_EXTERNAL_OES");
    }

    /* Allocate a texture struct */
    data = (GLES2_TextureData *)SDL_calloc(1, sizeof(GLES2_TextureData));
    if (!data) {
        return SDL_OutOfMemory();
    }
    data->texture = 0;
#ifdef GL_TEXTURE_EXTERNAL_OES
    data->texture_type = (texture->format == SDL_PIXELFORMAT_EXTERNAL_OES) ? GL_TEXTURE_EXTERNAL_OES : GL_TEXTURE_2D;
#else
    data->texture_type = GL_TEXTURE_2D;
#endif
    data->pixel_format = format;
    data->pixel_type = type;
    data->yuv = ((texture->format == SDL_PIXELFORMAT_IYUV) || (texture->format == SDL_PIXELFORMAT_YV12));
    data->nv12 = ((texture->format == SDL_PIXELFORMAT_NV12) || (texture->format == SDL_PIXELFORMAT_NV21));
    data->texture_u = 0;
    data->texture_v = 0;
    scaleMode = (texture->scaleMode == SDL_ScaleModeNearest) ? GL_NEAREST : GL_LINEAR;

    /* Allocate a blob for image renderdata */
    if (texture->access == SDL_TEXTUREACCESS_STREAMING) {
        size_t size;
        data->pitch = texture->w * SDL_BYTESPERPIXEL(texture->format);
        size = texture->h * data->pitch;
        if (data->yuv) {
            /* Need to add size for the U and V planes */
            size += 2 * ((texture->h + 1) / 2) * ((data->pitch + 1) / 2);
        } else if (data->nv12) {
            /* Need to add size for the U/V plane */
            size += 2 * ((texture->h + 1) / 2) * ((data->pitch + 1) / 2);
        }
        data->pixel_data = SDL_calloc(1, size);
        if (!data->pixel_data) {
            SDL_free(data);
            return SDL_OutOfMemory();
        }
    }

    /* Allocate the texture */
    GL_CheckError("", renderer);

    if (data->yuv) {
        renderdata->glGenTextures(1, &data->texture_v);
        if (GL_CheckError("glGenTexures()", renderer) < 0) {
            return -1;
        }
        renderdata->glActiveTexture(GL_TEXTURE2);
        renderdata->glBindTexture(data->texture_type, data->texture_v);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_MIN_FILTER, scaleMode);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_MAG_FILTER, scaleMode);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
        renderdata->glTexImage2D(data->texture_type, 0, format, (texture->w + 1) / 2, (texture->h + 1) / 2, 0, format, type, NULL);

        renderdata->glGenTextures(1, &data->texture_u);
        if (GL_CheckError("glGenTexures()", renderer) < 0) {
            return -1;
        }
        renderdata->glActiveTexture(GL_TEXTURE1);
        renderdata->glBindTexture(data->texture_type, data->texture_u);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_MIN_FILTER, scaleMode);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_MAG_FILTER, scaleMode);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
        renderdata->glTexImage2D(data->texture_type, 0, format, (texture->w + 1) / 2, (texture->h + 1) / 2, 0, format, type, NULL);
        if (GL_CheckError("glTexImage2D()", renderer) < 0) {
            return -1;
        }
    } else if (data->nv12) {
        renderdata->glGenTextures(1, &data->texture_u);
        if (GL_CheckError("glGenTexures()", renderer) < 0) {
            return -1;
        }
        renderdata->glActiveTexture(GL_TEXTURE1);
        renderdata->glBindTexture(data->texture_type, data->texture_u);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_MIN_FILTER, scaleMode);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_MAG_FILTER, scaleMode);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
        renderdata->glTexImage2D(data->texture_type, 0, GL_LUMINANCE_ALPHA, (texture->w + 1) / 2, (texture->h + 1) / 2, 0, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, NULL);
        if (GL_CheckError("glTexImage2D()", renderer) < 0) {
            return -1;
        }
    }

    renderdata->glGenTextures(1, &data->texture);
    if (GL_CheckError("glGenTexures()", renderer) < 0) {
        return -1;
    }
    texture->driverdata = data;
    renderdata->glActiveTexture(GL_TEXTURE0);
    renderdata->glBindTexture(data->texture_type, data->texture);
    renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_MIN_FILTER, scaleMode);
    renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_MAG_FILTER, scaleMode);
    renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    if (texture->format != SDL_PIXELFORMAT_EXTERNAL_OES) {
        renderdata->glTexImage2D(data->texture_type, 0, format, texture->w, texture->h, 0, format, type, NULL);
        if (GL_CheckError("glTexImage2D()", renderer) < 0) {
            return -1;
        }
    }

    if (texture->access == SDL_TEXTUREACCESS_TARGET) {
       data->fbo = GLES2_GetFBO(renderer->driverdata, texture->w, texture->h);
    } else {
       data->fbo = NULL;
    }

    return GL_CheckError("", renderer);
}

static int
GLES2_TexSubImage2D(GLES2_RenderData *data, GLenum target, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, const GLvoid *pixels, GLint pitch, GLint bpp)
{
    Uint8 *blob = NULL;
    Uint8 *src;
    int src_pitch;
    int y;

    if ((width == 0) || (height == 0) || (bpp == 0)) {
        return 0;  /* nothing to do */
    }

    /* Reformat the texture data into a tightly packed array */
    src_pitch = width * bpp;
    src = (Uint8 *)pixels;
    if (pitch != src_pitch) {
        blob = (Uint8 *)SDL_malloc(src_pitch * height);
        if (!blob) {
            return SDL_OutOfMemory();
        }
        src = blob;
        for (y = 0; y < height; ++y)
        {
            SDL_memcpy(src, pixels, src_pitch);
            src += src_pitch;
            pixels = (Uint8 *)pixels + pitch;
        }
        src = blob;
    }

    data->glTexSubImage2D(target, 0, xoffset, yoffset, width, height, format, type, src);
    if (blob) {
        SDL_free(blob);
    }
    return 0;
}

static int
GLES2_RenderCopy(SDL_Renderer *renderer, SDL_Texture *texture, const SDL_Rect *srcrect,
                 const SDL_FRect *dstrect)
GLES2_UpdateTexture(SDL_Renderer *renderer, SDL_Texture *texture, const SDL_Rect *rect,
                    const void *pixels, int pitch)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;
    GLfloat vertices[8];
    GLfloat texCoords[8];
    GLES2_RenderData *data = (GLES2_RenderData *)renderer->driverdata;
    GLES2_TextureData *tdata = (GLES2_TextureData *)texture->driverdata;

    GLES2_ActivateRenderer(renderer);

    if (GLES2_SetupCopy(renderer, texture) < 0) {
        return -1;
    /* Bail out if we're supposed to update an empty rectangle */
    if (rect->w <= 0 || rect->h <= 0) {
        return 0;
    }

    /* Emit the textured quad */
    vertices[0] = dstrect->x;
    vertices[1] = dstrect->y;
    vertices[2] = (dstrect->x + dstrect->w);
    vertices[3] = dstrect->y;
    vertices[4] = dstrect->x;
    vertices[5] = (dstrect->y + dstrect->h);
    vertices[6] = (dstrect->x + dstrect->w);
    vertices[7] = (dstrect->y + dstrect->h);
    /*data->glVertexAttribPointer(GLES2_ATTRIBUTE_POSITION, 2, GL_FLOAT, GL_FALSE, 0, vertices);*/
    GLES2_UpdateVertexBuffer(renderer, GLES2_ATTRIBUTE_POSITION, vertices, 8 * sizeof(GLfloat));
    texCoords[0] = srcrect->x / (GLfloat)texture->w;
    texCoords[1] = srcrect->y / (GLfloat)texture->h;
    texCoords[2] = (srcrect->x + srcrect->w) / (GLfloat)texture->w;
    texCoords[3] = srcrect->y / (GLfloat)texture->h;
    texCoords[4] = srcrect->x / (GLfloat)texture->w;
    texCoords[5] = (srcrect->y + srcrect->h) / (GLfloat)texture->h;
    texCoords[6] = (srcrect->x + srcrect->w) / (GLfloat)texture->w;
    texCoords[7] = (srcrect->y + srcrect->h) / (GLfloat)texture->h;
    /*data->glVertexAttribPointer(GLES2_ATTRIBUTE_TEXCOORD, 2, GL_FLOAT, GL_FALSE, 0, texCoords);*/
    GLES2_UpdateVertexBuffer(renderer, GLES2_ATTRIBUTE_TEXCOORD, texCoords, 8 * sizeof(GLfloat));
    data->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
    data->drawstate.texture = NULL;  /* we trash this state. */

    return GL_CheckError("", renderer);
    /* Create a texture subimage with the supplied data */
    data->glBindTexture(tdata->texture_type, tdata->texture);
    GLES2_TexSubImage2D(data, tdata->texture_type,
                    rect->x,
                    rect->y,
                    rect->w,
                    rect->h,
                    tdata->pixel_format,
                    tdata->pixel_type,
                    pixels, pitch, SDL_BYTESPERPIXEL(texture->format));

    if (tdata->yuv) {
        /* Skip to the correct offset into the next texture */
        pixels = (const void*)((const Uint8*)pixels + rect->h * pitch);
        if (texture->format == SDL_PIXELFORMAT_YV12) {
            data->glBindTexture(tdata->texture_type, tdata->texture_v);
        } else {
            data->glBindTexture(tdata->texture_type, tdata->texture_u);
        }
        GLES2_TexSubImage2D(data, tdata->texture_type,
                rect->x / 2,
                rect->y / 2,
                (rect->w + 1) / 2,
                (rect->h + 1) / 2,
                tdata->pixel_format,
                tdata->pixel_type,
                pixels, (pitch + 1) / 2, 1);


        /* Skip to the correct offset into the next texture */
        pixels = (const void*)((const Uint8*)pixels + ((rect->h + 1) / 2) * ((pitch + 1)/2));
        if (texture->format == SDL_PIXELFORMAT_YV12) {
            data->glBindTexture(tdata->texture_type, tdata->texture_u);
        } else {
            data->glBindTexture(tdata->texture_type, tdata->texture_v);
        }
        GLES2_TexSubImage2D(data, tdata->texture_type,
                rect->x / 2,
                rect->y / 2,
                (rect->w + 1) / 2,
                (rect->h + 1) / 2,
                tdata->pixel_format,
                tdata->pixel_type,
                pixels, (pitch + 1) / 2, 1);
    } else if (tdata->nv12) {
        /* Skip to the correct offset into the next texture */
        pixels = (const void*)((const Uint8*)pixels + rect->h * pitch);
        data->glBindTexture(tdata->texture_type, tdata->texture_u);
        GLES2_TexSubImage2D(data, tdata->texture_type,
                rect->x / 2,
                rect->y / 2,
                (rect->w + 1) / 2,
                (rect->h + 1) / 2,
                GL_LUMINANCE_ALPHA,
                GL_UNSIGNED_BYTE,
                pixels, 2 * ((pitch + 1) / 2), 2);
    }

    return GL_CheckError("glTexSubImage2D()", renderer);
}

static int
GLES2_RenderCopyEx(SDL_Renderer *renderer, SDL_Texture *texture, const SDL_Rect *srcrect,
                 const SDL_FRect *dstrect, const double angle, const SDL_FPoint *center, const SDL_RendererFlip flip)
GLES2_UpdateTextureYUV(SDL_Renderer * renderer, SDL_Texture * texture,
                    const SDL_Rect * rect,
                    const Uint8 *Yplane, int Ypitch,
                    const Uint8 *Uplane, int Upitch,
                    const Uint8 *Vplane, int Vpitch)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;
    GLfloat vertices[8];
    GLfloat texCoords[8];
    GLfloat translate[8];
    GLfloat fAngle[8];
    GLfloat tmp;
    float radian_angle;
    GLES2_RenderData *data = (GLES2_RenderData *)renderer->driverdata;
    GLES2_TextureData *tdata = (GLES2_TextureData *)texture->driverdata;

    GLES2_ActivateRenderer(renderer);

    if (GLES2_SetupCopy(renderer, texture) < 0) {
        return -1;
    /* Bail out if we're supposed to update an empty rectangle */
    if (rect->w <= 0 || rect->h <= 0) {
        return 0;
    }

    data->glEnableVertexAttribArray(GLES2_ATTRIBUTE_CENTER);
    data->glEnableVertexAttribArray(GLES2_ATTRIBUTE_ANGLE);
    data->drawstate.texture = NULL;  /* we trash this state. */

    radian_angle = (float)(M_PI * (360.0 - angle) / 180.0);
    fAngle[0] = fAngle[2] = fAngle[4] = fAngle[6] = (GLfloat)SDL_sin(radian_angle);
    /* render expects cos value - 1 (see GLES2_VertexSrc_Default_) */
    fAngle[1] = fAngle[3] = fAngle[5] = fAngle[7] = (GLfloat)SDL_cos(radian_angle) - 1.0f;
    /* Calculate the center of rotation */
    translate[0] = translate[2] = translate[4] = translate[6] = (center->x + dstrect->x);
    translate[1] = translate[3] = translate[5] = translate[7] = (center->y + dstrect->y);
    data->glBindTexture(tdata->texture_type, tdata->texture_v);
    GLES2_TexSubImage2D(data, tdata->texture_type,
                    rect->x / 2,
                    rect->y / 2,
                    (rect->w + 1) / 2,
                    (rect->h + 1) / 2,
                    tdata->pixel_format,
                    tdata->pixel_type,
                    Vplane, Vpitch, 1);

    /* Emit the textured quad */
    vertices[0] = dstrect->x;
    vertices[1] = dstrect->y;
    vertices[2] = (dstrect->x + dstrect->w);
    vertices[3] = dstrect->y;
    vertices[4] = dstrect->x;
    vertices[5] = (dstrect->y + dstrect->h);
    vertices[6] = (dstrect->x + dstrect->w);
    vertices[7] = (dstrect->y + dstrect->h);
    if (flip & SDL_FLIP_HORIZONTAL) {
        tmp = vertices[0];
        vertices[0] = vertices[4] = vertices[2];
        vertices[2] = vertices[6] = tmp;
    }
    if (flip & SDL_FLIP_VERTICAL) {
        tmp = vertices[1];
        vertices[1] = vertices[3] = vertices[5];
        vertices[5] = vertices[7] = tmp;
    data->glBindTexture(tdata->texture_type, tdata->texture_u);
    GLES2_TexSubImage2D(data, tdata->texture_type,
                    rect->x / 2,
                    rect->y / 2,
                    (rect->w + 1) / 2,
                    (rect->h + 1) / 2,
                    tdata->pixel_format,
                    tdata->pixel_type,
                    Uplane, Upitch, 1);

    data->glBindTexture(tdata->texture_type, tdata->texture);
    GLES2_TexSubImage2D(data, tdata->texture_type,
                    rect->x,
                    rect->y,
                    rect->w,
                    rect->h,
                    tdata->pixel_format,
                    tdata->pixel_type,
                    Yplane, Ypitch, 1);

    return GL_CheckError("glTexSubImage2D()", renderer);
}

static int
GLES2_LockTexture(SDL_Renderer *renderer, SDL_Texture *texture, const SDL_Rect *rect,
                  void **pixels, int *pitch)
{
    GLES2_TextureData *tdata = (GLES2_TextureData *)texture->driverdata;

    /* Retrieve the buffer/pitch for the specified region */
    *pixels = (Uint8 *)tdata->pixel_data +
              (tdata->pitch * rect->y) +
              (rect->x * SDL_BYTESPERPIXEL(texture->format));
    *pitch = tdata->pitch;

    return 0;
}

static void
GLES2_UnlockTexture(SDL_Renderer *renderer, SDL_Texture *texture)
{
    GLES2_TextureData *tdata = (GLES2_TextureData *)texture->driverdata;
    SDL_Rect rect;

    /* We do whole texture updates, at least for now */
    rect.x = 0;
    rect.y = 0;
    rect.w = texture->w;
    rect.h = texture->h;
    GLES2_UpdateTexture(renderer, texture, &rect, tdata->pixel_data, tdata->pitch);
}

static void
GLES2_SetTextureScaleMode(SDL_Renderer * renderer, SDL_Texture * texture, SDL_ScaleMode scaleMode)
{
    GLES2_RenderData *renderdata = (GLES2_RenderData *) renderer->driverdata;
    GLES2_TextureData *data = (GLES2_TextureData *) texture->driverdata;
    GLenum glScaleMode = (scaleMode == SDL_ScaleModeNearest) ? GL_NEAREST : GL_LINEAR;

    if (data->yuv) {
        renderdata->glActiveTexture(GL_TEXTURE2);
        renderdata->glBindTexture(data->texture_type, data->texture_v);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_MIN_FILTER, glScaleMode);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_MAG_FILTER, glScaleMode);

        renderdata->glActiveTexture(GL_TEXTURE1);
        renderdata->glBindTexture(data->texture_type, data->texture_u);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_MIN_FILTER, glScaleMode);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_MAG_FILTER, glScaleMode);
    } else if (data->nv12) {
        renderdata->glActiveTexture(GL_TEXTURE1);
        renderdata->glBindTexture(data->texture_type, data->texture_u);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_MIN_FILTER, glScaleMode);
        renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_MAG_FILTER, glScaleMode);
    }

    /*data->glVertexAttribPointer(GLES2_ATTRIBUTE_ANGLE, 1, GL_FLOAT, GL_FALSE, 0, &fAngle);
    data->glVertexAttribPointer(GLES2_ATTRIBUTE_CENTER, 2, GL_FLOAT, GL_FALSE, 0, translate);
    data->glVertexAttribPointer(GLES2_ATTRIBUTE_POSITION, 2, GL_FLOAT, GL_FALSE, 0, vertices);*/
    renderdata->glActiveTexture(GL_TEXTURE0);
    renderdata->glBindTexture(data->texture_type, data->texture);
    renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_MIN_FILTER, glScaleMode);
    renderdata->glTexParameteri(data->texture_type, GL_TEXTURE_MAG_FILTER, glScaleMode);
}

    GLES2_UpdateVertexBuffer(renderer, GLES2_ATTRIBUTE_ANGLE, fAngle, 8 * sizeof(GLfloat));
    GLES2_UpdateVertexBuffer(renderer, GLES2_ATTRIBUTE_CENTER, translate, 8 * sizeof(GLfloat));
    GLES2_UpdateVertexBuffer(renderer, GLES2_ATTRIBUTE_POSITION, vertices, 8 * sizeof(GLfloat));
static int
GLES2_SetRenderTarget(SDL_Renderer * renderer, SDL_Texture * texture)
{
    GLES2_RenderData *data = (GLES2_RenderData *) renderer->driverdata;
    GLES2_TextureData *texturedata = NULL;
    GLenum status;

    texCoords[0] = srcrect->x / (GLfloat)texture->w;
    texCoords[1] = srcrect->y / (GLfloat)texture->h;
    texCoords[2] = (srcrect->x + srcrect->w) / (GLfloat)texture->w;
    texCoords[3] = srcrect->y / (GLfloat)texture->h;
    texCoords[4] = srcrect->x / (GLfloat)texture->w;
    texCoords[5] = (srcrect->y + srcrect->h) / (GLfloat)texture->h;
    texCoords[6] = (srcrect->x + srcrect->w) / (GLfloat)texture->w;
    texCoords[7] = (srcrect->y + srcrect->h) / (GLfloat)texture->h;
    /*data->glVertexAttribPointer(GLES2_ATTRIBUTE_TEXCOORD, 2, GL_FLOAT, GL_FALSE, 0, texCoords);*/
    GLES2_UpdateVertexBuffer(renderer, GLES2_ATTRIBUTE_TEXCOORD, texCoords, 8 * sizeof(GLfloat));
    data->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
    data->glDisableVertexAttribArray(GLES2_ATTRIBUTE_CENTER);
    data->glDisableVertexAttribArray(GLES2_ATTRIBUTE_ANGLE);
    data->drawstate.viewport_dirty = SDL_TRUE;

    return GL_CheckError("", renderer);
    if (texture == NULL) {
        data->glBindFramebuffer(GL_FRAMEBUFFER, data->window_framebuffer);
    } else {
        texturedata = (GLES2_TextureData *) texture->driverdata;
        data->glBindFramebuffer(GL_FRAMEBUFFER, texturedata->fbo->FBO);
        /* TODO: check if texture pixel format allows this operation */
        data->glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, texturedata->texture_type, texturedata->texture, 0);
        /* Check FBO status */
        status = data->glCheckFramebufferStatus(GL_FRAMEBUFFER);
        if (status != GL_FRAMEBUFFER_COMPLETE) {
            return SDL_SetError("glFramebufferTexture2D() failed");
        }
    }
    return 0;
}

static void
GLES2_DestroyTexture(SDL_Renderer *renderer, SDL_Texture *texture)
{
    GLES2_RenderData *data = (GLES2_RenderData *)renderer->driverdata;
    GLES2_TextureData *tdata = (GLES2_TextureData *)texture->driverdata;

    GLES2_ActivateRenderer(renderer);

    if (data->drawstate.texture == texture) {
        data->drawstate.texture = NULL;
    }
    if (data->drawstate.target == texture) {
        data->drawstate.target = NULL;
    }

    /* Destroy the texture */
    if (tdata) {
        data->glDeleteTextures(1, &tdata->texture);
        if (tdata->texture_v) {
            data->glDeleteTextures(1, &tdata->texture_v);
        }
        if (tdata->texture_u) {
            data->glDeleteTextures(1, &tdata->texture_u);
        }
        SDL_free(tdata->pixel_data);
        SDL_free(tdata);
        texture->driverdata = NULL;
    }
}

static int
GLES2_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
                    Uint32 pixel_format, void * pixels, int pitch)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;
    GLES2_RenderData *data = (GLES2_RenderData *)renderer->driverdata;
    Uint32 temp_format = renderer->target ? renderer->target->format : SDL_PIXELFORMAT_ABGR8888;
    size_t buflen;
    void *temp_pixels;
@@ -1944,10 +1841,8 @@
    int w, h, length, rows;
    int status;

    GLES2_ActivateRenderer(renderer);

    temp_pitch = rect->w * SDL_BYTESPERPIXEL(temp_format);
    buflen = (size_t) (rect->h * temp_pitch);
    buflen = rect->h * temp_pitch;
    if (buflen == 0) {
        return 0;  /* nothing to do. */
    }
@@ -1967,10 +1862,11 @@

    /* Flip the rows to be top-down if necessary */
    if (!renderer->target) {
        SDL_bool isstack;
        length = rect->w * SDL_BYTESPERPIXEL(temp_format);
        src = (Uint8*)temp_pixels + (rect->h-1)*temp_pitch;
        dst = (Uint8*)temp_pixels;
        tmp = SDL_stack_alloc(Uint8, length);
        tmp = SDL_small_alloc(Uint8, length, &isstack);
        rows = rect->h / 2;
        while (rows--) {
            SDL_memcpy(tmp, dst, length);
@@ -1979,7 +1875,7 @@
            dst += temp_pitch;
            src -= temp_pitch;
        }
        SDL_stack_free(tmp);
        SDL_small_free(tmp, isstack);
    }

    status = SDL_ConvertPixels(rect->w, rect->h,
@@ -1993,8 +1889,6 @@
static void
GLES2_RenderPresent(SDL_Renderer *renderer)
{
    GLES2_ActivateRenderer(renderer);

    /* Tell the video driver to swap buffers */
    SDL_GL_SwapWindow(renderer->window);
}
@@ -2008,11 +1902,12 @@

static int GLES2_BindTexture (SDL_Renderer * renderer, SDL_Texture *texture, float *texw, float *texh)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;
    GLES2_RenderData *data = (GLES2_RenderData *)renderer->driverdata;
    GLES2_TextureData *texturedata = (GLES2_TextureData *)texture->driverdata;
    GLES2_ActivateRenderer(renderer);

    data->glBindTexture(texturedata->texture_type, texturedata->texture);
    data->drawstate.texture = texture;

    if (texw) {
        *texw = 1.0;
@@ -2026,11 +1921,12 @@

static int GLES2_UnbindTexture (SDL_Renderer * renderer, SDL_Texture *texture)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *)renderer->driverdata;
    GLES2_RenderData *data = (GLES2_RenderData *)renderer->driverdata;
    GLES2_TextureData *texturedata = (GLES2_TextureData *)texture->driverdata;
    GLES2_ActivateRenderer(renderer);

    data->glBindTexture(texturedata->texture_type, 0);
    data->drawstate.texture = NULL;

    return 0;
}
@@ -2044,40 +1940,12 @@
#define GL_NVIDIA_PLATFORM_BINARY_NV 0x890B
#endif

static void
GLES2_ResetState(SDL_Renderer *renderer)
{
    GLES2_DriverContext *data = (GLES2_DriverContext *) renderer->driverdata;

    if (SDL_CurrentContext == data->context) {
        GLES2_UpdateViewport(renderer);
    } else {
        GLES2_ActivateRenderer(renderer);
    }

    data->current.blendMode = SDL_BLENDMODE_INVALID;
    data->current.tex_coords = SDL_FALSE;

    data->glActiveTexture(GL_TEXTURE0);
    data->glPixelStorei(GL_PACK_ALIGNMENT, 1);
    data->glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

    data->glClearColor((GLfloat) data->clear_r * inv255f,
                        (GLfloat) data->clear_g * inv255f,
                        (GLfloat) data->clear_b * inv255f,
                        (GLfloat) data->clear_a * inv255f);

    data->glEnableVertexAttribArray(GLES2_ATTRIBUTE_POSITION);
    data->glDisableVertexAttribArray(GLES2_ATTRIBUTE_TEXCOORD);

    GL_CheckError("", renderer);
}

static SDL_Renderer *
GLES2_CreateRenderer(SDL_Window *window, Uint32 flags)
{
    SDL_Renderer *renderer;
    GLES2_DriverContext *data;
    GLES2_RenderData *data;
    GLint nFormats;
#ifndef ZUNE_HD
    GLboolean hasCompiler;
@@ -2099,6 +1967,7 @@
    }

    window_flags = SDL_GetWindowFlags(window);

    /* OpenGL ES 3.0 is a superset of OpenGL ES 2.0 */
    if (!(window_flags & SDL_WINDOW_OPENGL) ||
        profile_mask != SDL_GL_CONTEXT_PROFILE_ES || major < RENDERER_CONTEXT_MAJOR) {
@@ -2120,9 +1989,9 @@
        goto error;
    }

    data = (GLES2_DriverContext *)SDL_calloc(1, sizeof(GLES2_DriverContext));
    data = (GLES2_RenderData *)SDL_calloc(1, sizeof(GLES2_RenderData));
    if (!data) {
        GLES2_DestroyRenderer(renderer);
        SDL_free(renderer);
        SDL_OutOfMemory();
        goto error;
    }
@@ -2134,16 +2003,21 @@
    /* Create an OpenGL ES 2.0 context */
    data->context = SDL_GL_CreateContext(window);
    if (!data->context) {
        GLES2_DestroyRenderer(renderer);
        SDL_free(renderer);
        SDL_free(data);
        goto error;
    }
    if (SDL_GL_MakeCurrent(window, data->context) < 0) {
        GLES2_DestroyRenderer(renderer);
        SDL_GL_DeleteContext(data->context);
        SDL_free(renderer);
        SDL_free(data);
        goto error;
    }

    if (GLES2_LoadFunctions(data) < 0) {
        GLES2_DestroyRenderer(renderer);
        SDL_GL_DeleteContext(data->context);
        SDL_free(renderer);
        SDL_free(data);
        goto error;
    }

@@ -2204,6 +2078,9 @@
    }
#endif /* ZUNE_HD */

    /* we keep a few of these and cycle through them, so data can live for a few frames. */
    data->glGenBuffers(SDL_arraysize(data->vertex_buffers), data->vertex_buffers);

    data->framebuffers = NULL;
    data->glGetIntegerv(GL_FRAMEBUFFER_BINDING, &window_framebuffer);
    data->window_framebuffer = (GLuint)window_framebuffer;
@@ -2217,15 +2094,16 @@
    renderer->UpdateTextureYUV    = GLES2_UpdateTextureYUV;
    renderer->LockTexture         = GLES2_LockTexture;
    renderer->UnlockTexture       = GLES2_UnlockTexture;
    renderer->SetTextureScaleMode = GLES2_SetTextureScaleMode;
    renderer->SetRenderTarget     = GLES2_SetRenderTarget;
    renderer->UpdateViewport      = GLES2_UpdateViewport;
    renderer->UpdateClipRect      = GLES2_UpdateClipRect;
    renderer->RenderClear         = GLES2_RenderClear;
    renderer->RenderDrawPoints    = GLES2_RenderDrawPoints;
    renderer->RenderDrawLines     = GLES2_RenderDrawLines;
    renderer->RenderFillRects     = GLES2_RenderFillRects;
    renderer->RenderCopy          = GLES2_RenderCopy;
    renderer->RenderCopyEx        = GLES2_RenderCopyEx;
    renderer->QueueSetViewport    = GLES2_QueueSetViewport;
    renderer->QueueSetDrawColor   = GLES2_QueueSetViewport;  /* SetViewport and SetDrawColor are (currently) no-ops. */
    renderer->QueueDrawPoints     = GLES2_QueueDrawPoints;
    renderer->QueueDrawLines      = GLES2_QueueDrawPoints;  /* lines and points queue vertices the same way. */
    renderer->QueueFillRects      = GLES2_QueueFillRects;
    renderer->QueueCopy           = GLES2_QueueCopy;
    renderer->QueueCopyEx         = GLES2_QueueCopyEx;
    renderer->RunCommandQueue     = GLES2_RunCommandQueue;
    renderer->RenderReadPixels    = GLES2_RenderReadPixels;
    renderer->RenderPresent       = GLES2_RenderPresent;
    renderer->DestroyTexture      = GLES2_DestroyTexture;
@@ -2241,7 +2119,23 @@
    renderer->info.texture_formats[renderer->info.num_texture_formats++] = SDL_PIXELFORMAT_EXTERNAL_OES;
#endif

    GLES2_ResetState(renderer);
    /* Set up parameters for rendering */
    data->glActiveTexture(GL_TEXTURE0);
    data->glPixelStorei(GL_PACK_ALIGNMENT, 1);
    data->glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

    data->glEnableVertexAttribArray(GLES2_ATTRIBUTE_POSITION);
    data->glDisableVertexAttribArray(GLES2_ATTRIBUTE_TEXCOORD);

    data->glClearColor(1.0f, 1.0f, 1.0f, 1.0f);

    data->drawstate.blend = SDL_BLENDMODE_INVALID;
    data->drawstate.color = 0xFFFFFFFF;
    data->drawstate.clear_color = 0xFFFFFFFF;
    data->drawstate.projection[3][0] = -1.0f;
    data->drawstate.projection[3][3] = 1.0f;

    GL_CheckError("", renderer);

    return renderer;

@@ -2256,6 +2150,23 @@
    return NULL;
}

SDL_RenderDriver GLES2_RenderDriver = {
    GLES2_CreateRenderer,
    {
        "opengles2",
        (SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC | SDL_RENDERER_TARGETTEXTURE),
        4,
        {
        SDL_PIXELFORMAT_ARGB8888,
        SDL_PIXELFORMAT_ABGR8888,
        SDL_PIXELFORMAT_RGB888,
        SDL_PIXELFORMAT_BGR888
        },
        0,
        0
    }
};

#endif /* SDL_VIDEO_RENDER_OGL_ES2 && !SDL_RENDER_DISABLED */

/* vi: set ts=4 sw=4 expandtab: */