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shader.c
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shader.c
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#include <stdlib.h>
#include <stdio.h>
#include <GL/glew.h>
#include "shader.h"
unsigned int compile_shader(const char *src, int type)
{
unsigned int shader;
int compile_ok;
shader = glCreateShader(type);
glShaderSource(shader, 1, &src, NULL);
glCompileShader(shader);
glGetShaderiv(shader, GL_COMPILE_STATUS, &compile_ok);
if(!compile_ok) {
glDeleteShader(shader);
return 0;
}
return shader;
}
unsigned int create_program(const char *vert_src, const char *frag_src)
{
unsigned int program, frag_shader, vert_shader;
int link_ok;
char *log;
vert_shader = compile_shader(vert_src, GL_VERTEX_SHADER);
if(!vert_shader) {
fprintf(stderr, "Failed to compile vertex shader!\n");
return 0;
}
frag_shader = compile_shader(frag_src, GL_FRAGMENT_SHADER);
if(!frag_shader) {
fprintf(stderr, "Failed to compile fragment shader!\n");
return 0;
}
program = glCreateProgram();
glAttachShader(program, frag_shader);
glAttachShader(program, vert_shader);
glLinkProgram(program);
log = (char *) calloc(512, sizeof(char));
glGetProgramiv(program, GL_LINK_STATUS, &link_ok);
if(!link_ok) {
glGetProgramInfoLog(program, 512, NULL, log);
fprintf(stderr, "Failed to link shader: %s\n", log);
glDeleteProgram(program);
program = 0;
}
free(log);
glDeleteShader(frag_shader);
glDeleteShader(vert_shader);
return program;
}