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#include "utils.h"
#include <stdlib.h>
#define MAX_SHADER_SIZE 8
// TODO: Compute?
// Would probably require a different path altogther
// due to how those shaders are compiled tho
typedef enum{
VERTEX = 0,
FRAGMENT = 1
}ShaderStep;
// This returns *allocated* memory,
// should be manually free()'ed or some kind of arena used.
static char* shader_block_preprocess(const char* shader_source, ShaderStep shader_step) {
static const char* start_markers[2] = {"@vertex", "@fragment"};
static const char* end_markers[2] = {"@vs_end", "@fs_end"};
static const char* version_statement = "#version 330\n";
char* parsed_total = NULL;
int start_idx = TextFindIndex(shader_source, start_markers[shader_step]);
if (start_idx == BLANK_DEFAULT){
TRACELOG(LOG_ERROR, "%s could not be found.", start_markers[shader_step]);
goto parse_err;
}
start_idx += TextLength(start_markers[shader_step]);
int end_idx = TextFindIndex(shader_source, end_markers[shader_step]);
if (end_idx == BLANK_DEFAULT){
TRACELOG(LOG_ERROR, "%s could not be found. Don't forget to end blocks!", end_markers[shader_step]);
goto parse_err;
}
int block_sz = end_idx - start_idx;
const char* block = TextSubtext(shader_source, start_idx, block_sz);
int total_block_size = block_sz + TextLength(version_statement);
parsed_total = (char*)RL_MALLOC(total_block_size + NULL_TERM_SZ);
int cursor = 0;
TextAppend(parsed_total, version_statement, &cursor);
TextAppend(parsed_total, block, &cursor);
parse_err:
return parsed_total;
}
static Shader load_joined_shader(const char* path)
{
Shader something = (Shader){0};
char* shr = LoadFileText(path);
char* vs = shader_block_preprocess(shr, VERTEX);
if(vs == NULL){
TRACELOG(LOG_ERROR, "Unsuccessful vertex shader parse for %s", path);
goto vertex_err;
}
char* fs = shader_block_preprocess(shr, FRAGMENT);
if(fs == NULL){
TRACELOG(LOG_ERROR, "Unsuccessful fragment shader parse for %s", path);
goto frag_err;
}
something = LoadShaderFromMemory(vs, fs);
RL_FREE(fs);
frag_err:
RL_FREE(vs);
vertex_err:
UnloadFileText(shr);
return something;
}
static Shader shader_slots[MAX_SHADER_SIZE] = {0};
void init_shader_sys(void)
{
for(int i = 0; i < MAX_SHADER_SIZE; ++i){
shader_slots[i] = (Shader){0};
}
}
int load_new_shader(const char* path)
{
int current_idx = BLANK_DEFAULT;
for(int i = 0; i < MAX_SHADER_SIZE; ++i){
if(shader_slots[i].id <= 0){
current_idx = i;
shader_slots[current_idx] = load_joined_shader(path);
break;
}
}
//TODO: Handle slots a bit better.
if(current_idx == BLANK_DEFAULT)
TRACELOG(LOG_WARNING, "Warning: No more empty shader slots.\n");
return current_idx;
}
void set_active_shader(int idx)
{
if(idx < 0 || idx >= MAX_SHADER_SIZE)
TRACELOG(LOG_WARNING,"Bounds check: Attempted to set shader at non-existent index %i.\n", idx);
else
BeginShaderMode(shader_slots[idx]);
}
void reset_active_shader(void)
{
EndShaderMode();
}
void unload_shader(int idx)
{
if(idx < 0 || idx >= MAX_SHADER_SIZE){
TRACELOG(LOG_WARNING,"Bounds check: Attempted to unload shader at non-existent index %i.\n", idx);
return;
}
UnloadShader(shader_slots[idx]);
shader_slots[idx] = (Shader){0};
}
void unload_active_shaders(void)
{
for(int i = 0; i < MAX_SHADER_SIZE; ++i){
if(shader_slots[i].id > 0)
unload_shader(i);
}
}
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