RCOpenGLTexture3DCategory.m

//
//  RCOpenGLTexture3DCategory.m
//  Texture3
//
//  Created by rcrebs on 10/28/10.
//  Copyright 2010 __MyCompanyName__. All rights reserved.
//

#import "RCOpenGLTexture3DCategory.h"
#import "RCPlanetVertex.h"

static BOOL __generatedTextures = NO;

@implementation OpenGLTexture3D (RCOpenGLTexture3DCategory)
- (id)initWithFilename:(NSString *)inFilename andBindToTextureIndex:(int) index width:(GLuint)inWidth height:(GLuint)inHeight {
	if ((self = [super init]))
	{
		glEnable(GL_TEXTURE_2D);
		
//		NSString *fileName = inFilename;
		glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
		
		/***************************************************************
		 * First used, then textures need to be allocated.
		 *************************Below This****************************/
		if (!__generatedTextures) {
            *texture = (GLuint) malloc(sizeof(GLuint) * NumberOfPlanets);
			glGenTextures(NumberOfPlanets, &texture[0]);
			__generatedTextures = YES;
		}
		
		glBindTexture(GL_TEXTURE_2D, texture[index]);
		/*************************Above This****************************/
		
		//glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); 
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); 
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
		glBlendFunc(GL_ONE, GL_SRC_COLOR);
		
		// Find the texture data from the file system
		NSData *texData = [NSData findTextDataForImageNamed:inFilename];
		
		// Assumes pvr4 is RGB not RGBA, which is how texturetool generates them
		if ([[inFilename pathExtension] isEqualToString:@"pvr4"])
			glCompressedTexImage2D(GL_TEXTURE_2D, 0, GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG, inWidth, inHeight, 0, (inWidth * inHeight) / 2, [texData bytes]);
		else if ([[inFilename pathExtension] isEqualToString:@"pvr2"])
			glCompressedTexImage2D(GL_TEXTURE_2D, 0, GL_COMPRESSED_RGB_PVRTC_2BPPV1_IMG, inWidth, inHeight, 0, (inWidth * inHeight) / 2, [texData bytes]);
		else
		{
			UIImage *image = [[UIImage alloc] initWithData:texData];
			if (image == nil)
				return nil;
			
			GLuint width = CGImageGetWidth(image.CGImage);
			GLuint height = CGImageGetHeight(image.CGImage);
			CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
			void *imageData = malloc( height * width * 4 );
			CGContextRef context = CGBitmapContextCreate( imageData, width, height, 8, 4 * width, colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big );
			CGColorSpaceRelease( colorSpace );
			CGContextClearRect( context, CGRectMake( 0, 0, width, height ) );
			CGContextDrawImage( context, CGRectMake( 0, 0, width, height ), image.CGImage );
			
			glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, imageData);
			//GLuint errorcode = glGetError();
			CGContextRelease(context);
			
			free(imageData);
			[image release];
		}
		glEnable(GL_BLEND);
		
	}
	return self;
}

- (void)bindToTextureIndex:(int) index
{
	//NSLog(@"Binding texture: %@ (OGL: %d", filename, texture[0]);
	glBindTexture(GL_TEXTURE_2D, texture[index]);
}
@end