axmol/cocos2dx/textures/CCPVRTexture.cpp

/****************************************************************************
Copyright (c) 2010 cocos2d-x.org

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
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THE SOFTWARE.
****************************************************************************/

#include "CCPVRTexture.h"
#include "ccMacros.h"


#define PVR_TEXTURE_FLAG_TYPE_MASK	0xff

static char* gPVRTexIdentifier[] = {"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;

CCPVRTexture::CCPVRTexture()
{
}

CCPVRTexture::~CCPVRTexture()
{
	CCLOGINFO( "cocos2d: deallocing CCPVRTexture" );

	m_pImageData->removeAllObjects();
	CCX_SAFE_DELETE(m_pImageData)

	if (m_uName != 0 && ! m_bRetainName )
		glDeleteTextures(1, &m_uName);
}

GLuint CCPVRTexture::getName()
{
	return m_uName;
}

uint32_t CCPVRTexture::getWidth()
{
	return m_uWidth;
}

uint32_t CCPVRTexture::getHeight()
{
	return m_uHeight;
}

GLenum CCPVRTexture::getInternalFormat()
{
	return m_uInternalFormat;
}

bool CCPVRTexture::getHasAlpha()
{
	return m_bHasAlpha;
}

bool CCPVRTexture::getRetainName()
{
	return m_bRetainName;
}

void CCPVRTexture::setRetainName(bool var)
{
	m_bRetainName = var;
}

/** @todo NSData uint8_t
- (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 CCPVRTexture::createGLTexture()
{
	int width = m_uWidth;
	int height = m_uHeight;
	NSData *data;
	GLenum err;

	if (m_pImageData->count() > 0)
	{
		if (m_uName != 0)
			glDeleteTextures(1, &m_uName);

		glGenTextures(1, &m_uName);
		glBindTexture(GL_TEXTURE_2D, m_uName);
	}

	for (UINT32 i=0; i < m_pImageData->count(); i++)
	{
/// @todo NSData		data = m_pImageData->getObjectAtIndex(i);
/// @todo NSData		glCompressedTexImage2D(GL_TEXTURE_2D, i, m_uInternalFormat, width, height, 0, [data length], [data bytes]);

		err = glGetError();
		if (err != GL_NO_ERROR)
		{
			CCLOG("Error uploading compressed texture level: %u. glError: %u", i, err);
			return false;
		}

		width = MAX(width >> 1, 1);
		height = MAX(height >> 1, 1);
	}

	m_pImageData->removeAllObjects();

	return true;
}


CCPVRTexture * CCPVRTexture::initWithContentsOfFile(const char* path)
{
	/** @todo NSData
	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 this;
}

/** @todo NSURL
- (id)initWithContentsOfURL:(NSURL *)url
{
	if (![url isFileURL])
	{
		CCLOG(@"cocos2d: CCPVRTexture: Only files are supported");
		[self release];
		return nil;
	}

	return [self initWithContentsOfFile:[url path]];
}*/


CCPVRTexture * CCPVRTexture::pvrTextureWithContentsOfFile(const char* path)
{
	CCPVRTexture * pTexture = new CCPVRTexture();
	pTexture->initWithContentsOfFile(path);
	pTexture->autorelease();
	return pTexture;
}

/** @todo NSURL
+ (id)pvrTextureWithContentsOfURL:(NSURL *)url
{
	if (![url isFileURL])
		return nil;

	return [CCPVRTexture pvrTextureWithContentsOfFile:[url path]];
}*/