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/*
* Komposter
*
* Copyright (c) 2010 Noora Halme et al. (see AUTHORS)
*
* This code is licensed under the GNU General Public
* License version 2. See LICENSE for full text.
*
* Shader loading and compiling
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include "shader.h"
// from main.c
extern char respath[512];
// shader file names
char shaderfile[SHADER_COUNT][255]={
"palette.frag"
};
// handles for shader programs
GLuint shader_program[SHADER_COUNT];
// print shader compile errors
void programerrors(GLuint pr) {
int maxlen, infolen;
char info[65536];
glGetProgramiv(pr,GL_INFO_LOG_LENGTH,&maxlen);
glGetProgramInfoLog(pr, maxlen, &infolen, info);
printf("%s\n",info);
}
// load shader from file and compile, returns handle
GLuint loadshader(char *fname, GLuint type)
{
char *temp;
GLuint sh;
FILE *f;
int maxlen, infolen;
char info[65536];
fprintf(stderr, "loading shader %s\n", fname);
temp=calloc(65536, 1);
f=fopen(fname, "r");
fread(temp, 1, 65536, f);
fclose(f);
sh=glCreateShader(type);
glShaderSource(sh, 1, (const GLchar* const *)&temp, NULL);
glCompileShader(sh);
if(glIsShader(sh)) {
glGetShaderiv(sh, GL_INFO_LOG_LENGTH, &maxlen);
glGetShaderInfoLog(sh, maxlen, &infolen, info);
if (infolen>0) printf("%s\n", info);
}
return sh;
}
int shader_init(void)
{
int i;
GLuint h;
char fullpath[512];
// load and compile shaders
for(i=0;i<SHADER_COUNT;i++) {
strncpy(fullpath, respath, 511);
strncat(fullpath, "shaders/", 511);
strncat(fullpath, shaderfile[i], 511);
h=loadshader(fullpath, GL_FRAGMENT_SHADER);
shader_program[i]=glCreateProgram();
glAttachShader(shader_program[i], h);
glLinkProgram(shader_program[i]);
programerrors(shader_program[i]);
}
return 1;
}
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