dxt_util.c

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#include "dxt_common.h" 
#include "dxt_util.h"
 
GLuint
dxt_shader_create_from_source(const char* source, GLenum type)
{
    // Create shader
    GLuint shader = glCreateShader(type);
    
    // Compile shader source
    glShaderSource(shader, 1, (const GLchar**)&source, NULL);
    glCompileShader(shader);    
    
    // Check result
    GLint status;
    glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
    if ( status == GL_FALSE ) {
        char log[32768];
        glGetShaderInfoLog(shader, 32768, NULL, (GLchar*)log);
        printf("Shader Compilation Failed : %s\n", log);
        return 0;
    }
    
    return shader;
}
 
GLuint
dxt_shader_create_from_file(const char* filename, GLenum type)
{    
    // Load program from file
    FILE* file;
        file = fopen(filename, "r");
        if ( !file ) {
                fprintf(stderr, "Failed open %s for reading!\n", filename);
                return 0;
        }
    fseek(file, 0, SEEK_END);
    int data_size = ftell(file);
    assert(data_size >= 0);
    rewind(file);
    char* program = (char*)malloc((data_size  + 1) * sizeof(char));
    if ( (size_t) data_size != fread(program, sizeof(char), data_size, file) ) {
        fprintf(stderr, "Failed to load program [%d bytes] from file %s!\n", data_size, filename);
        free(program);
        fclose(file);
        return 0;
    }
    fclose(file);
    program[data_size] = '\0';
 
    printf("Compiling program [%s]...\n", filename);
    GLuint shader =  dxt_shader_create_from_source(program, type);
    if ( shader == 0 ) {
        free(program);
        return 0;
    }
    
    free(program);
    
    return shader;
}