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shader: automatically prepend #version line

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GL: "#version 130" (3.0)
GLES: "#version 100" (2.0)
This commit is contained in:
Sebastian Krzyszkowiak 2018-07-05 01:05:50 +02:00
parent 5888cd2575
commit 3a04729fb6
1 changed files with 29 additions and 1 deletions
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30
src/shader.c
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@ -22,10 +22,37 @@
#include <allegro5/allegro.h>
#include <math.h>
static ALLEGRO_USTR* GetShaderSource(struct Game* game, const char* filename) {
ALLEGRO_FILE* fp = al_fopen(filename, "r");
if (!fp) {
FatalError(game, false, "Failed to open shader file %s", filename);
return NULL;
}
ALLEGRO_USTR* str = al_ustr_new(al_get_opengl_variant() == ALLEGRO_OPENGL_ES ? "#version 100\n" : "#version 130\n");
while (true) {
char buf[512];
size_t n;
ALLEGRO_USTR_INFO info;
n = al_fread(fp, buf, sizeof(buf));
if (n <= 0) {
break;
}
al_ustr_append(str, al_ref_buffer(&info, buf, n));
}
al_fclose(fp);
return str;
}
static bool AttachToShader(struct Game* game, ALLEGRO_SHADER* shader, ALLEGRO_SHADER_TYPE type, const char* filename) {
bool ret;
if (filename) {
ret = al_attach_shader_source_file(shader, type, filename);
ALLEGRO_USTR* src = GetShaderSource(game, filename);
if (!src) {
return false;
}
ret = al_attach_shader_source(shader, type, al_cstr(src));
al_ustr_free(src);
} else {
ret = al_attach_shader_source(shader, type, al_get_default_shader_source(al_get_shader_platform(shader), type));
}
@ -80,6 +107,7 @@ SYMBOL_EXPORT void DestroyShader(struct Game* game, ALLEGRO_SHADER* shader) {
if (item->fragment) {
free(item->fragment);
}
free(item);
}
SYMBOL_INTERNAL void ReloadShaders(struct Game* game, bool force) {