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#include "../../include/mgl/graphics/shader.h"
#include "../../include/mgl/graphics/texture.h"
#include "../../include/mgl/system/fileutils.h"
#include "../../include/mgl/mgl.h"
#include <stdlib.h>
#include <stdio.h>
typedef struct {
unsigned int id;
mgl_shader_type shader_type;
} mgl_shader;
static unsigned int mgl_shader_type_to_gl_shader_type(mgl_shader_type shader_type) {
switch(shader_type) {
case MGL_SHADER_VERTEX: return GL_VERTEX_SHADER;
case MGL_SHADER_FRAGMENT: return GL_FRAGMENT_SHADER;
case MGL_SHADER_GEOMETRY: return GL_GEOMETRY_SHADER;
}
return 0;
}
static void print_compile_log(mgl_context *context, unsigned int shader_id, const char *prefix) {
int log_length = 0;
context->gl.glGetShaderiv(shader_id, GL_INFO_LOG_LENGTH, &log_length);
if(log_length > 0) {
char *log_str = malloc(log_length + 1);
if(!log_str) {
fprintf(stderr, "Error: failed to allocate memory for shader compile log\n");
return;
}
log_str[0] = '\0';
log_str[log_length] = '\0';
context->gl.glGetShaderInfoLog(shader_id, log_length, NULL, log_str);
fprintf(stderr, "%s: %s\n", prefix, log_str);
free(log_str);
}
}
static void mgl_shader_unload(mgl_shader *self);
static int mgl_shader_load_from_memory(mgl_shader *self, const unsigned char *shader_data, int shader_size, mgl_shader_type shader_type) {
self->id = 0;
self->shader_type = shader_type;
mgl_context *context = mgl_get_context();
self->id = context->gl.glCreateShader(mgl_shader_type_to_gl_shader_type(shader_type));
if(self->id == 0) {
fprintf(stderr, "Error: failed to load shader, error: glCreateShader failed\n");
return -1;
}
context->gl.glShaderSource(self->id, 1, (const char* const*)&shader_data, &shader_size);
context->gl.glCompileShader(self->id);
int compiled_successfully = GL_FALSE;
context->gl.glGetShaderiv(self->id, GL_COMPILE_STATUS, &compiled_successfully);
if(compiled_successfully == GL_FALSE) {
print_compile_log(context, self->id, "Error");
mgl_shader_unload(self);
return -1;
}
print_compile_log(context, self->id, "Warning");
return 0;
}
static int mgl_shader_load_from_file(mgl_shader *self, const char *filepath, mgl_shader_type shader_type) {
self->id = 0;
self->shader_type = shader_type;
mgl_filedata filedata;
if(mgl_load_file(filepath, &filedata, NULL) != 0) {
fprintf(stderr, "Error: failed to load shader %s, error: mgl_load_file failed\n", filepath);
return -1;
}
if(filedata.size > INT32_MAX) {
fprintf(stderr, "Error: failed to load shader %s, error: shader size is too large\n", filepath);
return -1;
}
int res = mgl_shader_load_from_memory(self, filedata.data, filedata.size, shader_type);
mgl_filedata_free(&filedata);
return res;
}
void mgl_shader_unload(mgl_shader *self) {
mgl_context *context = mgl_get_context();
if(self->id) {
context->gl.glDeleteShader(self->id);
self->id = 0;
}
}
int mgl_shader_program_init(mgl_shader_program *self) {
self->id = 0;
mgl_context *context = mgl_get_context();
self->id = context->gl.glCreateProgram();
if(self->id == 0) {
fprintf(stderr, "Error: failed to create shader program: error glCreateProgram failed\n");
return -1;
}
return 0;
}
void mgl_shader_program_deinit(mgl_shader_program *self){
mgl_context *context = mgl_get_context();
if(self->id) {
context->gl.glDeleteProgram(self->id);
self->id = 0;
}
}
/* TODO: Check for attach shader error */
int mgl_shader_program_add_shader_from_file(mgl_shader_program *self, const char *filepath, mgl_shader_type shader_type){
mgl_shader shader;
if(mgl_shader_load_from_file(&shader, filepath, shader_type) != 0)
return -1;
mgl_get_context()->gl.glAttachShader(self->id, shader.id);
mgl_shader_unload(&shader); /* TODO: Verify if deleting the shader here is always ok now that we have attached it */
return 0;
}
int mgl_shader_program_add_shader_from_memory(mgl_shader_program *self, const unsigned char *shader_data, int shader_size, mgl_shader_type shader_type){
mgl_shader shader;
if(mgl_shader_load_from_memory(&shader, shader_data, shader_size, shader_type) != 0)
return -1;
mgl_get_context()->gl.glAttachShader(self->id, shader.id);
mgl_shader_unload(&shader); /* TODO: Verify if deleting the shader here is always ok now that we have attached it */
return 0;
}
static void print_link_log(mgl_context *context, unsigned int shader_id, const char *prefix) {
int log_length = 0;
context->gl.glGetProgramiv(shader_id, GL_INFO_LOG_LENGTH, &log_length);
if(log_length > 0) {
char *log_str = malloc(log_length + 1);
if(!log_str) {
fprintf(stderr, "Error: failed to allocate memory for shader link log\n");
return;
}
log_str[0] = '\0';
log_str[log_length] = '\0';
context->gl.glGetProgramInfoLog(shader_id, log_length, NULL, log_str);
fprintf(stderr, "%s: %s\n", prefix, log_str);
free(log_str);
}
}
int mgl_shader_program_finalize(mgl_shader_program *self) {
mgl_context *context = mgl_get_context();
context->gl.glLinkProgram(self->id);
int is_linked = GL_TRUE;
context->gl.glGetProgramiv(self->id, GL_LINK_STATUS, &is_linked);
if(is_linked == GL_FALSE) {
print_link_log(context, self->id, "Error");
return -1;
}
print_link_log(context, self->id, "Warning");
return 0;
}
/* TODO: Optimize glUseProgram */
/* TODO: Optimize glGetUniformLocation */
/* TODO: Check if the uniform type matches the type of the value we want to set it to */
int mgl_shader_program_set_uniform_float(mgl_shader_program *self, const char *uniform_name, float value) {
mgl_context *context = mgl_get_context();
int uniform_location = context->gl.glGetUniformLocation(self->id, uniform_name);
if(uniform_location == -1) {
fprintf(stderr, "Error: no uniform by the name %s was found in the shader\n", uniform_name);
return -1;
}
context->gl.glUseProgram(self->id);
context->gl.glUniform1f(uniform_location, value);
context->gl.glUseProgram(0);
return 0;
}
int mgl_shader_program_set_uniform_vec2f(mgl_shader_program *self, const char *uniform_name, mgl_vec2f value) {
mgl_context *context = mgl_get_context();
int uniform_location = context->gl.glGetUniformLocation(self->id, uniform_name);
if(uniform_location == -1) {
fprintf(stderr, "Error: no uniform by the name %s was found in the shader\n", uniform_name);
return -1;
}
context->gl.glUseProgram(self->id);
context->gl.glUniform2f(uniform_location, value.x, value.y);
context->gl.glUseProgram(0);
return 0;
}
/* TODO: Optimize glUseProgram */
void mgl_shader_program_use(mgl_shader_program *shader_program) {
mgl_context *context = mgl_get_context();
context->gl.glUseProgram(shader_program ? shader_program->id : 0);
}
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