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/*
* shaderuitils.c
*
* Shader utilities
*
* (c) 2008 Thomas White <taw27@cam.ac.uk>
*
* thrust3d - a silly game
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <glew.h>
#include <stdio.h>
void shaderutils_setunf(GLuint program, const char *name, GLfloat val) {
GLint loc;
loc = glGetUniformLocation(program, name);
glUniform1f(loc, val);
}
void shaderutils_setun2f(GLuint program, const char *name, GLfloat val1, GLfloat val2) {
GLint loc;
loc = glGetUniformLocation(program, name);
glUniform2f(loc, val1, val2);
}
void shaderutils_setuni(GLuint program, const char *name, GLint val) {
GLint loc;
loc = glGetUniformLocation(program, name);
glUniform1i(loc, val);
}
GLuint shaderutils_load_shader(const char *filename, GLenum type) {
GLuint shader;
char text[4096];
size_t len;
FILE *fh;
int l;
GLint status;
fh = fopen(filename, "r");
if ( fh == NULL ) {
fprintf(stderr, "Couldn't load shader '%s'\n", filename);
return 0;
}
len = fread(text, 1, 4095, fh);
fclose(fh);
text[len] = '\0';
const GLchar *source = text;
shader = glCreateShader(type);
glShaderSource(shader, 1, &source, NULL);
glCompileShader(shader);
glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
if ( status == GL_FALSE ) {
printf("Problems loading '%s':\n", filename);
glGetShaderInfoLog(shader, 4095, &l, text);
if ( l > 0 ) {
printf("%s\n", text); fflush(stdout);
} else {
printf("Shader compilation failed.\n");
}
}
return shader;
}
int shaderutils_link_program(GLuint program) {
int l;
GLint status;
char text[4096];
glLinkProgram(program);
glGetProgramiv(program, GL_LINK_STATUS, &status);
if ( status == GL_FALSE ) {
printf("Program linking errors:\n");
glGetProgramInfoLog(program, 4095, &l, text);
if ( l > 0 ) {
printf("%s\n", text); fflush(stdout);
} else {
printf("Program linking failed.\n");
}
}
return status;
}
int shaderutils_validate_program(GLuint program) {
GLint status;
int l;
char text[4096];
glValidateProgram(program);
glGetProgramiv(program, GL_VALIDATE_STATUS, &status);
if ( status == GL_FALSE ) {
printf("Program validation errors:\n");
glGetProgramInfoLog(program, 4095, &l, text);
if ( l > 0 ) {
printf("%s\n", text); fflush(stdout);
} else {
printf("Program did not validate successfully.\n");
}
return 0;
}
return 1;
}
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