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twn_textures.c: make missing texture single and reused

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This commit is contained in:
veclavtalica 2025-01-15 00:10:30 +03:00
parent f0ad9b9a8a
commit 3990f78a74
1 changed files with 30 additions and 14 deletions
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38
src/twn_textures.c
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@ -41,7 +41,8 @@ static int load_eof_callback(void *user) {
}
static uint8_t *missing_texture_data;
static SDL_Surface *missing_texture_surface;
static uint16_t missing_texture_id;
static SDL_Surface *gen_missing_texture_surface(void) {
Uint32 rmask, gmask, bmask;
@ -56,22 +57,23 @@ static SDL_Surface *gen_missing_texture_surface(void) {
bmask = 0x00ff0000;
#endif
if (!missing_texture_data) {
missing_texture_data = SDL_malloc(64 * 64 * 3);
for (int y = 0; y < 64; ++y)
if (!missing_texture_surface) {
uint8_t *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;
data[(y * 64 + x) * 3 + 0] = (x / 2 + y / 2) % 2 == 0 ? 175 : 0;
data[(y * 64 + x) * 3 + 1] = (x / 2 + y / 2) % 2 == 0 ? 0 : 0;
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 *missing_texture_surface = SDL_CreateRGBSurfaceFrom(missing_texture_data, 64, 64,
missing_texture_surface = SDL_CreateRGBSurfaceFrom(data, 64, 64,
3 * 8,
64 * 3,
rmask, gmask, bmask, 0);
}
return missing_texture_surface;
}
@ -327,8 +329,10 @@ void textures_cache_deinit(TextureCache *cache) {
/* free cache hashes */
for (size_t i = 0; i < shlenu(cache->hash); ++i) {
if (cache->hash[i].value.data->pixels != missing_texture_data)
if (missing_texture_surface && cache->hash[i].value.data->pixels != missing_texture_surface->pixels)
stbi_image_free(cache->hash[i].value.data->pixels);
else
SDL_free(cache->hash[i].value.data->pixels);
SDL_FreeSurface(cache->hash[i].value.data);
}
shfree(cache->hash);
@ -372,6 +376,9 @@ static TextureKey textures_load(TextureCache *cache, const char *path) {
return (TextureKey){ (uint16_t)i };
SDL_Surface *surface = textures_load_surface(path);
if (surface == missing_texture_surface && missing_texture_id != 0)
return (TextureKey){ missing_texture_id };
Texture new_texture = {
.data = surface,
.mode = infer_texture_mode(surface),
@ -388,13 +395,22 @@ static TextureKey textures_load(TextureCache *cache, const char *path) {
new_texture.loner_texture = create_gpu_texture(TEXTURE_FILTER_NEAREAST, true);
upload_texture_from_surface(new_texture.loner_texture, surface);
new_texture.srcrect = (Rect) { .w = (float)surface->w, .h = (float)surface->h };
} else {
/* will be fully populated as the atlas updates */
new_texture.atlas_index = cache->atlas_index;
cache->is_dirty = true;
}
shput(cache->hash, path, new_texture);
return (TextureKey){ (uint16_t)shgeti(cache->hash, path) };
uint16_t const id = (uint16_t)shgeti(cache->hash, path);
/* reuse this id for every later missing texture */
if (surface == missing_texture_surface)
missing_texture_id = id;
return (TextureKey){ id };
}