UtilSrc/sourceUtil.c

/*
     File: sourceUtil.c
 Abstract: 
 Functions for loading source files for shaders.
 
  Version: 1.7
 
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 */
 
#include "sourceUtil.h"
 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
demoSource* srcLoadSource(const char* filepathname)
{
    demoSource* source = (demoSource*) calloc(sizeof(demoSource), 1);
    
    // Check the file name suffix to determine what type of shader this is
    const char* suffixBegin = filepathname + strlen(filepathname) - 4;
    
    if(0 == strncmp(suffixBegin, ".fsh", 4))
    {
        source->shaderType = GL_FRAGMENT_SHADER;
    }
    else if(0 == strncmp(suffixBegin, ".vsh", 4))
    {
        source->shaderType = GL_VERTEX_SHADER;
    }
    else
    {
        // Unknown suffix
        source->shaderType = 0;
    }
    
    FILE* curFile = fopen(filepathname, "r");
    
    // Get the size of the source
    fseek(curFile, 0, SEEK_END);
    GLsizei fileSize = ftell (curFile);
    
    // Add 1 to the file size to include the null terminator for the string
    source->byteSize = fileSize + 1;
    
    // Alloc memory for the string
    source->string = malloc(source->byteSize);
    
    // Read entire file into the string from beginning of the file
    fseek(curFile, 0, SEEK_SET);
    fread(source->string, 1, fileSize, curFile);
    
    fclose(curFile);
    
    // Insert null terminator
    source->string[fileSize] = 0;
    
    return source;
}
 
void srcDestroySource(demoSource* source)
{
    free(source->string);
    free(source);
}