bundle util.m

//
//  NSBundle+GLUtil.m
//  Concorde
//
//  Created by Dylan Lukes on 9/25/10.
//  Copyright 2010 Dylan Lukes. All rights reserved.
//

#import "NSBundle+CGLUtil.h"


@implementation NSBundle (CGLUtil)

- (BOOL)loadShaderNamed:(NSString*)shaderName buffer:(const GLchar**)buffer length:(GLint*)length error:(NSError**)error{
    NSDictionary *errorInfo;
        
    NSURL* url = [self URLForResource:shaderName withExtension:nil subdirectory:@"Shaders"];
    NSString* shader = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:error];
    if (!shader) {
        errorInfo = [NSDictionary dictionaryWithObjectsAndKeys:
                     [NSString stringWithFormat:@"Shader \"%@\" could not be loaded.", shaderName],
                     NSLocalizedDescriptionKey,
                     [NSString stringWithFormat:@"Does \"%@\" exist?", shaderName],
                     NSLocalizedRecoverySuggestionErrorKey,
                     nil];
        *error = [NSError errorWithDomain:@"com.dlukes.cglutil" code:0 userInfo:errorInfo];
        return NO;
    }
    
    if (buffer){
        *buffer = [shader UTF8String];
    } else {
        errorInfo = [NSDictionary dictionaryWithObjectsAndKeys:
                     [NSString stringWithFormat:@"Reference for \"buffer\" passed for \"%@\" is invalid.", shaderName],
                     NSLocalizedDescriptionKey,
                     [NSString stringWithFormat:@"Make sure you are passing a ** type", shaderName],
                     NSLocalizedRecoverySuggestionErrorKey,
                     nil];
        *error = [NSError errorWithDomain:@"com.dlukes.cglutil" code:1 userInfo:errorInfo];
        return NO;
    }

    if (length){
        *length = [shader lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
    } else {
        errorInfo = [NSDictionary dictionaryWithObjectsAndKeys:
                     [NSString stringWithFormat:@"Reference for \"length\" passed for \"%@\" is invalid.", shaderName],
                     NSLocalizedDescriptionKey,
                     [NSString stringWithFormat:@"Make sure you are passing a * type", shaderName],
                     NSLocalizedRecoverySuggestionErrorKey,
                     nil];
        *error = [NSError errorWithDomain:@"com.dlukes.cglutil" code:1 userInfo:errorInfo];
        return NO;
    }

    return YES;
}

- (BOOL)loadTextureNamed:(NSString*)textureName pixels:(GLvoid**)pixels width:(GLsizei*)width height:(GLsizei*)height flip:(BOOL)flip error:(NSError**)error{
    NSDictionary *errorInfo;
    
    NSURL* url = [self URLForResource:textureName withExtension:nil subdirectory:@"Textures"];
    NSLog(@"%@", url);
    CGImageSourceRef source = CGImageSourceCreateWithURL((CFURLRef)url, NULL);
    
    CGImageRef tex = CGImageSourceCreateImageAtIndex(source, 0, NULL);
    
    if (!tex) {
        errorInfo = [NSDictionary dictionaryWithObjectsAndKeys:
                     [NSString stringWithFormat:@"Texture \"%@\" could not be loaded.", textureName],
                     NSLocalizedDescriptionKey,
                     [NSString stringWithFormat:@"Does \"%@\" exist?", textureName],
                     NSLocalizedRecoverySuggestionErrorKey,
                     nil];
        *error = [NSError errorWithDomain:@"com.dlukes.cglutil" code:0 userInfo:errorInfo];
        return NO;
    }
    
    size_t w = CGImageGetWidth(tex);
    size_t h = CGImageGetWidth(tex);
    GLvoid* imgdata = malloc(w * h * 4);
    
    CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB();
    CGContextRef context = CGBitmapContextCreate(imgdata, w, h, 8, w * 4, colorspace, kCGImageAlphaPremultipliedLast);
    
    if (flip) {
        CGContextTranslateCTM(context, 0.0f, h);
        CGContextScaleCTM(context, 1.0f, -1.0f);
    }
    CGContextDrawImage(context, CGRectMake(0.0, 0.0, (CGFloat)w, (CGFloat)h), tex);
    
    CGContextRelease(context);
    CGColorSpaceRelease(colorspace);
    CGImageRelease(tex);
    CFRelease(source);
    
    if (width){
        *width = w;
    } else {
        errorInfo = [NSDictionary dictionaryWithObjectsAndKeys:
                     [NSString stringWithFormat:@"Reference for \"width\" passed for \"%@\" is invalid.", textureName],
                     NSLocalizedDescriptionKey,
                     [NSString stringWithFormat:@"Make sure you are passing a * type", textureName],
                     NSLocalizedRecoverySuggestionErrorKey,
                     nil];
        *error = [NSError errorWithDomain:@"com.dlukes.cglutil" code:1 userInfo:errorInfo];
        return NO;
    }
    
    if (height){
        *height = h;
    } else {
        errorInfo = [NSDictionary dictionaryWithObjectsAndKeys:
                     [NSString stringWithFormat:@"Reference for \"height\" passed for \"%@\" is invalid.", textureName],
                     NSLocalizedDescriptionKey,
                     [NSString stringWithFormat:@"Make sure you are passing a * type", textureName],
                     NSLocalizedRecoverySuggestionErrorKey,
                     nil];
        *error = [NSError errorWithDomain:@"com.dlukes.cglutil" code:1 userInfo:errorInfo];
        return NO;
    }
    
    if (pixels){
        *pixels = imgdata;
    } else {
        errorInfo = [NSDictionary dictionaryWithObjectsAndKeys:
                     [NSString stringWithFormat:@"Reference for \"length\" passed for \"%@\" is invalid.", textureName],
                     NSLocalizedDescriptionKey,
                     [NSString stringWithFormat:@"Make sure you are passing a ** type", textureName],
                     NSLocalizedRecoverySuggestionErrorKey,
                     nil];
        *error = [NSError errorWithDomain:@"com.dlukes.cglutil" code:1 userInfo:errorInfo];
        return NO;
    }
    
    return YES;
}  

@end