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experimental: textures_get_key() caching for embedded in binary path strings

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veclav talica 2024-07-19 23:44:29 +03:00
parent 867dea1958
commit 875af2a758
1 changed files with 32 additions and 0 deletions
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32
src/textures.c
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@ -361,7 +361,39 @@ void textures_update_atlas(struct texture_cache *cache) {
arrfree(rects); arrfree(rects);
} }
/* EXPERIMANTAL: LIKELY TO BE REMOVED! */
/* todo: If it's proven to be useful: add runtime checking for .rodata > .data */
#ifdef __unix__ /* use rodata elf section for fast lookups of repeating textures */
extern const char start_rodata_address[];
extern const char stop_rodata_heuristic[];
asm(".set start_rodata_address, .rodata");
asm(".set stop_rodata_heuristic, .data"); /* there's nothing in default linker script to know the size of .rodata */
t_texture_key textures_get_key(struct texture_cache *cache, const char *path) {
static const char *last_path = NULL;
static t_texture_key last_texture;
/* fast path */
if (path == last_path && path >= start_rodata_address && path < stop_rodata_heuristic)
return last_texture;
/* hash tables are assumed to be stable, so we just return indices */
int texture = (int)shgeti(cache->hash, path);
/* load it if it isn't */
if (texture == -1) {
last_texture = textures_load(cache, path);
} else
last_texture = (t_texture_key){ texture };
last_path = path;
return last_texture;
}
#else
t_texture_key textures_get_key(struct texture_cache *cache, const char *path) { t_texture_key textures_get_key(struct texture_cache *cache, const char *path) {
/* hash tables are assumed to be stable, so we just return indices */ /* hash tables are assumed to be stable, so we just return indices */
ptrdiff_t texture = shgeti(cache->hash, path); ptrdiff_t texture = shgeti(cache->hash, path);