/*File: PVRTexture.mAbstract: The PVRTexture class is responsible for loading .pvr files.Version: 1.0Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Inc.("Apple") in consideration of your agreement to the following terms, and youruse, installation, modification or redistribution of this Apple softwareconstitutes acceptance of these terms.  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All Rights Reserved.*/#import "PVRTexture.h"#import "Texture2D.h"		// cocos2d integration#define PVR_TEXTURE_FLAG_TYPE_MASK	0xffstatic char gPVRTexIdentifier[4] = "PVR!";enum{	kPVRTextureFlagTypePVRTC_2 = 24,	kPVRTextureFlagTypePVRTC_4};typedef struct _PVRTexHeader{	uint32_t headerLength;	uint32_t height;	uint32_t width;	uint32_t numMipmaps;	uint32_t flags;	uint32_t dataLength;	uint32_t bpp;	uint32_t bitmaskRed;	uint32_t bitmaskGreen;	uint32_t bitmaskBlue;	uint32_t bitmaskAlpha;	uint32_t pvrTag;	uint32_t numSurfs;} PVRTexHeader;@implementation PVRTexture@synthesize name = _name;@synthesize width = _width;@synthesize height = _height;@synthesize internalFormat = _internalFormat;@synthesize hasAlpha = _hasAlpha;// cocos2d integration@synthesize retainName = _retainName;- (BOOL)unpackPVRData:(NSData *)data{	BOOL success = FALSE;	PVRTexHeader *header = NULL;	uint32_t flags, pvrTag;	uint32_t dataLength = 0, dataOffset = 0, dataSize = 0;	uint32_t blockSize = 0, widthBlocks = 0, heightBlocks = 0;	uint32_t width = 0, height = 0, bpp = 4;	uint8_t *bytes = NULL;	uint32_t formatFlags;		header = (PVRTexHeader *)[data bytes];		pvrTag = CFSwapInt32LittleToHost(header->pvrTag);	if ((uint32_t)gPVRTexIdentifier[0] != ((pvrTag >>  0) & 0xff) ||		(uint32_t)gPVRTexIdentifier[1] != ((pvrTag >>  8) & 0xff) ||		(uint32_t)gPVRTexIdentifier[2] != ((pvrTag >> 16) & 0xff) ||		(uint32_t)gPVRTexIdentifier[3] != ((pvrTag >> 24) & 0xff))	{		return FALSE;	}		flags = CFSwapInt32LittleToHost(header->flags);	formatFlags = flags & PVR_TEXTURE_FLAG_TYPE_MASK;		if (formatFlags == kPVRTextureFlagTypePVRTC_4 || formatFlags == kPVRTextureFlagTypePVRTC_2)	{		[_imageData removeAllObjects];				if (formatFlags == kPVRTextureFlagTypePVRTC_4)			_internalFormat = GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG;		else if (formatFlags == kPVRTextureFlagTypePVRTC_2)			_internalFormat = GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG;			_width = width = CFSwapInt32LittleToHost(header->width);		_height = height = CFSwapInt32LittleToHost(header->height);				if (CFSwapInt32LittleToHost(header->bitmaskAlpha))			_hasAlpha = TRUE;		else			_hasAlpha = FALSE;				dataLength = CFSwapInt32LittleToHost(header->dataLength);				bytes = ((uint8_t *)[data bytes]) + sizeof(PVRTexHeader);				// Calculate the data size for each texture level and respect the minimum number of blocks		while (dataOffset < dataLength)		{			if (formatFlags == kPVRTextureFlagTypePVRTC_4)			{				blockSize = 4 * 4; // Pixel by pixel block size for 4bpp				widthBlocks = width / 4;				heightBlocks = height / 4;				bpp = 4;			}			else			{				blockSize = 8 * 4; // Pixel by pixel block size for 2bpp				widthBlocks = width / 8;				heightBlocks = height / 4;				bpp = 2;			}						// Clamp to minimum number of blocks			if (widthBlocks < 2)				widthBlocks = 2;			if (heightBlocks < 2)				heightBlocks = 2;			dataSize = widthBlocks * heightBlocks * ((blockSize  * bpp) / 8);						[_imageData addObject:[NSData dataWithBytes:bytes+dataOffset length:dataSize]];						dataOffset += dataSize;						width = MAX(width >> 1, 1);			height = MAX(height >> 1, 1);		}				  		success = TRUE;	}		return success;}- (BOOL)createGLTexture{	int width = _width;	int height = _height;	NSData *data;	GLenum err;		if ([_imageData count] > 0)	{		if (_name != 0)			glDeleteTextures(1, &_name);				glGenTextures(1, &_name);		glBindTexture(GL_TEXTURE_2D, _name);	}		[Texture2D applyTexParameters];	// cocos2d integration	for (NSUInteger i=0; i < [_imageData count]; i++)	{		data = [_imageData objectAtIndex:i];		glCompressedTexImage2D(GL_TEXTURE_2D, i, _internalFormat, width, height, 0, [data length], [data bytes]);				err = glGetError();		if (err != GL_NO_ERROR)		{			NSLog(@"Error uploading compressed texture level: %d. glError: 0x%04X", i, err);			return FALSE;		}				width = MAX(width >> 1, 1);		height = MAX(height >> 1, 1);	}		[_imageData removeAllObjects];		return TRUE;}- (id)initWithContentsOfFile:(NSString *)path{	if((self = [super init]))	{		NSData *data = [NSData dataWithContentsOfFile:path];				_imageData = [[NSMutableArray alloc] initWithCapacity:10];				_name = 0;		_width = _height = 0;		_internalFormat = GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG;		_hasAlpha = FALSE;				_retainName = NO; // cocos2d integration		if (!data || ![self unpackPVRData:data] || ![self createGLTexture])		{			[self release];			self = nil;		}	}		return self;}- (id)initWithContentsOfURL:(NSURL *)url{	if (![url isFileURL])	{		[self release];		return nil;	}		return [self initWithContentsOfFile:[url path]];}+ (id)pvrTextureWithContentsOfFile:(NSString *)path{	return [[[self alloc] initWithContentsOfFile:path] autorelease];}+ (id)pvrTextureWithContentsOfURL:(NSURL *)url{	if (![url isFileURL])		return nil;		return [PVRTexture pvrTextureWithContentsOfFile:[url path]];}- (void)dealloc{	[_imageData release];		if (_name != 0 && ! _retainName )		glDeleteTextures(1, &_name);		[super dealloc];}@end