#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 "mojodds.h"
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// from http://graphics.stanford.edu/~seander/bithacks.html
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static bool isPow2(unsigned int v) {
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return v && !(v & (v - 1));
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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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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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uintptr_t texoffset = ((const char *)(tex)) - contents;
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printf("MOJODDS_getTexture retval: %d\n", retval);
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printf("texoffset: %u\n", (unsigned int)(texoffset));
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printf("texlen: %lu\n", texlen);
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printf("glfmt: 0x%x\n", glfmt);
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printf("width x height: %d x %d\n", w, h);
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printf("miplevels: %d\n", miplevels);
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printf("\n");
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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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uintptr_t miptexoffset = ((const char *)(miptex)) - ((const char *)(tex));
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bool npot = !(isPow2(mipW) || isPow2(mipH));
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printf("%4d x %4d %s", mipW, mipH, npot ? "NPOT " : " ");
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printf("miptexoffset: %8u ", (unsigned int)(miptexoffset));
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printf("miptexlen: %8lu\n", miptexlen);
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}
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}
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free(contents);
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return 0;
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}
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