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missing texture when loading fails

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veclavtalica 2025-01-13 17:35:50 +03:00
parent c694dfff82
commit 5f6c8dd8e6
1 changed files with 40 additions and 2 deletions
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42
src/twn_textures.c
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@ -40,6 +40,43 @@ static int load_eof_callback(void *user) {
return context->position == context->size;
}
static uint8_t *missing_texture_data;
static SDL_Surface *gen_missing_texture_surface(void) {
Uint32 rmask, gmask, bmask, amask;
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
rmask = 0xff000000;
gmask = 0x00ff0000;
bmask = 0x0000ff00;
#else
rmask = 0x000000ff;
gmask = 0x0000ff00;
bmask = 0x00ff0000;
#endif
if (!missing_texture_data) {
missing_texture_data = SDL_malloc(64 * 64 * 3);
for (int y = 0; y < 64; ++y)
for (int x = 0; x < 64; ++x) {
/* diagonal stripes, chosen so that asked pixel uvs are corresponding to final output */
missing_texture_data[(y * 64 + x) * 3 + 0] = (x / 2 + y / 2) % 2 == 0 ? 175 : 0;
missing_texture_data[(y * 64 + x) * 3 + 1] = (x / 2 + y / 2) % 2 == 0 ? 0 : 0;
missing_texture_data[(y * 64 + x) * 3 + 2] = (x / 2 + y / 2) % 2 == 0 ? 175 : 0;
}
}
/* same data is reused after being allocated/generated once */
SDL_Surface* surface = SDL_CreateRGBSurfaceFrom(missing_texture_data, 64, 64,
3 * 8,
64 * 3,
rmask, gmask, bmask, 0);
return surface;
}
SDL_Surface *textures_load_surface(const char *path) {
SDL_RWops *handle = PHYSFSRWOPS_openRead(path);
if (handle == NULL)
@ -93,8 +130,9 @@ ERR_CANNOT_CREATE_SURFACE:
ERR_CANNOT_READ_IMAGE:
ERR_CANNOT_OPEN_FILE:
CRY(path, "Failed to load image. Aborting...");
die_abruptly();
/* something didn't worked out, use a stub texture */
log_warn("Cannot open image: %s, using a stub", path);
return gen_missing_texture_surface();
}