#include <errno.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <SDL.h>
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#include <glew.h>
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#include "mojodds.h"
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// example how to use mojodds with OpenGL
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// this program doesn't actually draw anything
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// use apitrace, vogl or similar tool to see what it does
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static void pumpGLErrors() {
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GLenum err;
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while ((err = glGetError()) != GL_NO_ERROR) {
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switch (err) {
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case GL_INVALID_ENUM:
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printf("GL error GL_INVALID_ENUM\n");
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break;
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case GL_INVALID_VALUE:
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printf("GL error GL_INVALID_VALUE\n");
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break;
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default:
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printf("Unknown GL error %04x\n", err);
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break;
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}
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}
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}
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int main(int argc, char *argv[]) {
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if (argc != 2) {
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printf("Usage: %s DDS-file\n", argv[0]);
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return 0;
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}
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FILE *f = fopen(argv[1], "rb");
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if (!f) {
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printf("Error opening %s: %s (%d)\n", argv[1], strerror(errno), errno);
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return 1;
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}
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fseek(f, 0, SEEK_END);
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long size = ftell(f);
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fseek(f, 0, SEEK_SET);
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char *contents = malloc(size);
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size_t readbytes = fread(contents, 1, size, f);
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if (readbytes != size) {
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printf("Only got %u of %ld bytes: %s\n", (unsigned int) readbytes, size, strerror(errno));
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free(contents);
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fclose(f);
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return 2;
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}
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fclose(f);
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int isDDS = MOJODDS_isDDS(contents, size);
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printf("isDDS: %d\n", isDDS);
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if (isDDS) {
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SDL_Init(SDL_INIT_VIDEO);
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SDL_Window *window = SDL_CreateWindow("OpenGL DDS test", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 0, 0, SDL_WINDOW_OPENGL);
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if (window == NULL) {
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printf("Could not create window: %s\n", SDL_GetError());
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free(contents);
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return 3;
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}
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SDL_GLContext context = SDL_GL_CreateContext(window);
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if (context == NULL) {
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printf("Could not create GL context: %s\n", SDL_GetError());
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SDL_DestroyWindow(window);
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free(contents);
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return 4;
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}
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// clear and swap to get better traces
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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SDL_GL_SwapWindow(window);
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glewInit();
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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SDL_GL_SwapWindow(window);
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// glewInit might raise errors if we got an OpenGL 3.0 context
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// ignore them
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// in this case glGetError is simpler than fooling around with callbacks
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GLenum err = GL_NO_ERROR;
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while ((err = glGetError()) != GL_NO_ERROR) { }
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const void *tex = NULL;
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unsigned long texlen = 0;
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unsigned int glfmt = 0, w = 0, h = 0, miplevels = 0;
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int retval = MOJODDS_getTexture(contents, size, &tex, &texlen, &glfmt, &w, &h, &miplevels);
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bool isCompressed = true;
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GLenum internalFormat = glfmt;
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if (glfmt == GL_BGRA || glfmt == GL_BGR) {
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isCompressed = false;
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if (glfmt == GL_BGR) {
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internalFormat = GL_RGB8;
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} else {
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internalFormat = GL_RGBA8;
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}
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}
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GLuint texId = 0;
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// we leak this but don't care
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glGenTextures(1, &texId);
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glBindTexture(GL_TEXTURE_2D, texId);
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for (unsigned int miplevel = 0; miplevel < miplevels; miplevel++) {
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const void *miptex = NULL;
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unsigned long miptexlen = 0;
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unsigned int mipW = 0, mipH = 0;
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retval = MOJODDS_getMipMapTexture(miplevel, glfmt, tex, texlen, w, h, &miptex, &miptexlen, &mipW, &mipH);
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if (!retval) {
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printf("MOJODDS_getMipMapTexture(%u) error: %d\n", miplevel, retval);
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continue;
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}
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if (isCompressed) {
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glCompressedTexImage2D(GL_TEXTURE_2D, miplevel, glfmt, mipW, mipH, 0, miptexlen, miptex);
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} else {
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glTexImage2D(GL_TEXTURE_2D, miplevel, internalFormat, mipW, mipH, 0, glfmt, GL_UNSIGNED_BYTE, miptex);
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}
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pumpGLErrors();
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}
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// and now the same with ARB_texture_storage if it's available
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if (GLEW_ARB_texture_storage) {
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glGenTextures(1, &texId);
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glBindTexture(GL_TEXTURE_2D, texId);
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glTexStorage2D(GL_TEXTURE_2D, miplevels, internalFormat, w, h);
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pumpGLErrors();
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for (unsigned int miplevel = 0; miplevel < miplevels; miplevel++) {
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const void *miptex = NULL;
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unsigned long miptexlen = 0;
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unsigned int mipW = 0, mipH = 0;
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retval = MOJODDS_getMipMapTexture(miplevel, glfmt, tex, texlen, w, h, &miptex, &miptexlen, &mipW, &mipH);
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if (!retval) {
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printf("MOJODDS_getMipMapTexture(%u) error: %d\n", miplevel, retval);
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continue;
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}
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if (isCompressed) {
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glCompressedTexSubImage2D(GL_TEXTURE_2D, miplevel, 0, 0, mipW, mipH, glfmt, miptexlen, miptex);
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} else {
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glTexSubImage2D(GL_TEXTURE_2D, miplevel, 0, 0, mipW, mipH, glfmt, GL_UNSIGNED_BYTE, miptex);
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}
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pumpGLErrors();
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}
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}
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// one last clear and swap for clean trace end
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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SDL_GL_SwapWindow(window);
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SDL_GL_DeleteContext(context);
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SDL_DestroyWindow(window);
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}
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free(contents);
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return 0;
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}
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