CCTexturePVR.cpp:
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#include "CCTexture2D.h"
#include "CCTexturePVR.h" #include "ccMacros.h" #include "CCConfiguration.h" #include "support/ccUtils.h" #include "CCStdC.h" #include "platform/CCFileUtils.h" #include "support/zip_support/ZipUtils.h" #include "shaders/ccGLStateCache.h" #include <ctype.h> #include <cctype> //Cocos2d命名空间 NS_CC_BEGIN #define PVR_TEXTURE_FLAG_TYPE_MASK 0xff //PVR文件的信息标志位的各bit位意义 enum { kPVRTextureFlagMipmap = ( 1 << 8 ), // 有多级纹理 kPVRTextureFlagTwiddle = ( 1 << 9 ), // is twiddled kPVRTextureFlagBumpmap = ( 1 << 10 ), // 是法线贴图（用于产生凹凸感） kPVRTextureFlagTiling = ( 1 << 11 ), // is bordered for tiled pvr kPVRTextureFlagCubemap = ( 1 << 12 ), // 是立方体环境映射贴图（一般用于做天空盒） kPVRTextureFlagFalseMipCol = ( 1 << 13 ), // are there false coloured MIP levels kPVRTextureFlagVolume = ( 1 << 14 ), // 立体纹理，相当于有多层的纹理。 kPVRTextureFlagAlpha = ( 1 << 15 ), // v2.1 is there transparency info in the texture kPVRTextureFlagVerticalFlip = ( 1 << 16 ), // v2.1 is the texture vertically flipped } ; //PVR文件头标识 static char gPVRTexIdentifier [ 5 ] = "PVR!" ; //所有PVR文件的格式 enum { kPVRTexturePixelTypeRGBA_4444 = 0x10, kPVRTexturePixelTypeRGBA_5551, kPVRTexturePixelTypeRGBA_8888, kPVRTexturePixelTypeRGB_565, kPVRTexturePixelTypeRGB_555, // 这个Cocos2d-x暂不支持 kPVRTexturePixelTypeRGB_888, kPVRTexturePixelTypeI_8, kPVRTexturePixelTypeAI_88, kPVRTexturePixelTypePVRTC_2, kPVRTexturePixelTypePVRTC_4, kPVRTexturePixelTypeBGRA_8888, kPVRTexturePixelTypeA_8, } ; //信息数组 static const unsigned int tableFormats [ ] [ 7 ] = { //数组元素的结构为： // 1- PVR 文件格式 // 2- OpenGL 内部格式 // 3- OpenGL 格式 // 4- OpenGL 数据类型 // 5- 色深 // 6- 是否压缩 // 7- Cocos2d 像素格式 { kPVRTexturePixelTypeRGBA_4444, GL_RGBA, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4, 16, false, kCCTexture2DPixelFormat_RGBA4444 }, { kPVRTexturePixelTypeRGBA_5551, GL_RGBA, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, 16, false, kCCTexture2DPixelFormat_RGB5A1 }, { kPVRTexturePixelTypeRGBA_8888, GL_RGBA, GL_RGBA, GL_UNSIGNED_BYTE, 32, false, kCCTexture2DPixelFormat_RGBA8888 }, { kPVRTexturePixelTypeRGB_565, GL_RGB, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, 16, false, kCCTexture2DPixelFormat_RGB565 }, { kPVRTexturePixelTypeRGB_888, GL_RGB, GL_RGB, GL_UNSIGNED_BYTE, 24, false, kCCTexture2DPixelFormat_RGB888 }, { kPVRTexturePixelTypeA_8, GL_ALPHA, GL_ALPHA, GL_UNSIGNED_BYTE, 8, false, kCCTexture2DPixelFormat_A8 }, { kPVRTexturePixelTypeI_8, GL_LUMINANCE, GL_LUMINANCE, GL_UNSIGNED_BYTE, 8, false, kCCTexture2DPixelFormat_I8 }, { kPVRTexturePixelTypeAI_88, GL_LUMINANCE_ALPHA, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, 16, false, kCCTexture2DPixelFormat_AI88 }, #if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS) //如果程序运行在IOS上，还可支持以下信息 { kPVRTexturePixelTypePVRTC_2, GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG, ( unsigned int ) - 1, ( unsigned int ) - 1, 2, true, kCCTexture2DPixelFormat_PVRTC2 }, { kPVRTexturePixelTypePVRTC_4, GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG, ( unsigned int ) - 1, ( unsigned int ) - 1, 4, true, kCCTexture2DPixelFormat_PVRTC4 }, { kPVRTexturePixelTypeBGRA_8888, GL_RGBA, GL_BGRA, GL_UNSIGNED_BYTE, 32, false, kCCTexture2DPixelFormat_RGBA8888 }, #endif } ; //信息表的元素数量 #define MAX_TABLE_ELEMENTS (sizeof(tableFormats) / sizeof(tableFormats[0])) // enum { kCCInternalPVRTextureFormat, kCCInternalOpenGLInternalFormat, kCCInternalOpenGLFormat, kCCInternalOpenGLType, kCCInternalBPP, kCCInternalCompressedImage, kCCInternalCCTexture2DPixelFormat, } ; //PVR文件头信息结构 typedef struct _PVRTexHeader { unsigned int headerLength ; //头信息长度 unsigned int height ; //高 unsigned int width ; //宽 unsigned int numMipmaps ; //是否有多级纹理 unsigned int flags ; //标记位 unsigned int dataLength ; //后面的像素数据长度 unsigned int bpp ; //色深 unsigned int bitmaskRed ; //对应红色的像素位 unsigned int bitmaskGreen ; //对应绿色的像素位 unsigned int bitmaskBlue ; //对应蓝色的像素位 unsigned int bitmaskAlpha ; //对应ALPHA色的像素位 unsigned int pvrTag ; // unsigned int numSurfs ; //是否有多层 } PVRTexHeader ; //构造函数 CCTexturePVR :: CCTexturePVR ( ) : m_uTableFormatIndex ( 0 ) , m_uNumberOfMipmaps ( 0 ) , m_uWidth ( 0 ) , m_uHeight ( 0 ) , m_bRetainName ( false ) , m_bHasAlpha ( false ) , m_uName ( 0 ) , m_eFormat (kCCTexture2DPixelFormat_Default ) { } //析构函数 CCTexturePVR ::~CCTexturePVR ( ) { CCLOGINFO ( "cocos2d: deallocing CCTexturePVR" ) ; //释放OpenGL贴图 if (m_uName ! = 0 && ! m_bRetainName ) { ccGLDeleteTexture (m_uName ) ; } } //解压PVR像素数据 bool CCTexturePVR :: unpackPVRData ( unsigned char * data, unsigned int len ) { bool success = false ; PVRTexHeader *header = NULL ; unsigned int flags, pvrTag ; unsigned int dataLength = 0, dataOffset = 0, dataSize = 0 ; unsigned int blockSize = 0, widthBlocks = 0, heightBlocks = 0 ; unsigned int width = 0, height = 0, bpp = 4 ; unsigned char *bytes = NULL ; unsigned int formatFlags ; //将数据地址转为头信息指针，这个就可以直接通过结构指针进行存取。 header = (PVRTexHeader * )data ; //格式有效性检查 pvrTag = CC_SWAP_INT32_LITTLE_TO_HOST (header - >pvrTag ) ; /* Check that given data really represents pvrtexture [0] = 'P' [1] = 'V' [2] = 'R' [3] = '!' */ if (gPVRTexIdentifier [ 0 ] ! = ( (pvrTag >> 0 ) & 0xff ) || gPVRTexIdentifier [ 1 ] ! = ( (pvrTag >> 8 ) & 0xff ) || gPVRTexIdentifier [ 2 ] ! = ( (pvrTag >> 16 ) & 0xff ) || gPVRTexIdentifier [ 3 ] ! = ( (pvrTag >> 24 ) & 0xff ) ) { CCLOG ( "Unsupported PVR format. Use the Legacy format until the new format is supported" ) ; return false ; } //取得配置信息 CCConfiguration *configuration = CCConfiguration :: sharedConfiguration ( ) ; //取得标记 flags = CC_SWAP_INT32_LITTLE_TO_HOST (header - >flags ) ; formatFlags = flags & PVR_TEXTURE_FLAG_TYPE_MASK ; bool flipped = (flags & kPVRTextureFlagVerticalFlip ) ? true : false ; if (flipped ) { CCLOG ( "cocos2d: WARNING: Image is flipped. Regenerate it using PVRTexTool" ) ; } //查看是否支持非2的幂次方大小的纹理 if ( ! configuration - >supportsNPOT ( ) && (header - >width ! = ccNextPOT (header - >width ) || header - >height ! = ccNextPOT (header - >height ) ) ) { CCLOG ( "cocos2d: ERROR: Loding an NPOT texture (%dx%d) but is not supported on this device", header - >width, header - >height ) ; return false ; } //遍历所有的格式信息数据，找到对应的格式信息。 for (m_uTableFormatIndex = 0 ; m_uTableFormatIndex < ( unsigned int )MAX_TABLE_ELEMENTS ; m_uTableFormatIndex ++ ) { if (tableFormats [m_uTableFormatIndex ] [kCCInternalPVRTextureFormat ] == formatFlags ) { //Reset num of mipmaps m_uNumberOfMipmaps = 0 ; //取得图片大小 m_uWidth = width = CC_SWAP_INT32_LITTLE_TO_HOST (header - >width ) ; m_uHeight = height = CC_SWAP_INT32_LITTLE_TO_HOST (header - >height ) ; //检查是否有ALPHA通道 if (CC_SWAP_INT32_LITTLE_TO_HOST (header - >bitmaskAlpha ) ) { m_bHasAlpha = true ; } else { m_bHasAlpha = false ; } //取得数据长度 dataLength = CC_SWAP_INT32_LITTLE_TO_HOST (header - >dataLength ) ; //将数据指针偏移到头信息之后，即像素数据所在位置 bytes = ( ( unsigned char * )data ) + sizeof (PVRTexHeader ) ; m_eFormat = (CCTexture2DPixelFormat ) (tableFormats [m_uTableFormatIndex ] [kCCInternalCCTexture2DPixelFormat ] ) ; bpp = tableFormats [m_uTableFormatIndex ] [kCCInternalBPP ] ; // 遍历每个多级纹理图像块 while (dataOffset < dataLength ) { switch (formatFlags ) { case kPVRTexturePixelTypePVRTC_2 : blockSize = 8 * 4 ; // Pixel by pixel block size for 2bpp widthBlocks = width / 8 ; heightBlocks = height / 4 ; break ; case kPVRTexturePixelTypePVRTC_4 : blockSize = 4 * 4 ; // Pixel by pixel block size for 4bpp widthBlocks = width / 4 ; heightBlocks = height / 4 ; break ; case kPVRTexturePixelTypeBGRA_8888 : if (CCConfiguration :: sharedConfiguration ( ) - >supportsBGRA8888 ( ) == false ) { CCLOG ( "cocos2d: TexturePVR. BGRA8888 not supported on this device" ) ; return false ; } default : blockSize = 1 ; widthBlocks = width ; heightBlocks = height ; break ; } // Clamp to minimum number of blocks if (widthBlocks < 2 ) { widthBlocks = 2 ; } if (heightBlocks < 2 ) { heightBlocks = 2 ; } dataSize = widthBlocks * heightBlocks * ( (blockSize * bpp ) / 8 ) ; unsigned int packetLength = (dataLength - dataOffset ) ; packetLength = packetLength > dataSize ? dataSize : packetLength ; //记录每个多级纹理图像块的像素数据地址和长度。 m_asMipmaps [m_uNumberOfMipmaps ]. address = bytes + dataOffset ; m_asMipmaps [m_uNumberOfMipmaps ]. len = packetLength ; m_uNumberOfMipmaps ++ ; //检查是否超出最大级数 CCAssert (m_uNumberOfMipmaps < CC_PVRMIPMAP_MAX, "TexturePVR: Maximum number of mimpaps reached. Increate the CC_PVRMIPMAP_MAX value" ) ; //偏移到下一个多级纹理图像块。 dataOffset + = packetLength ; //大小减为原来1/2。 width = MAX (width >> 1, 1 ) ; height = MAX (height >> 1, 1 ) ; } //读取完成 success = true ; break ; } } //成功判断 if ( ! success ) { CCLOG ( "cocos2d: WARNING: Unsupported PVR Pixel Format: 0x%2x. Re-encode it with a OpenGL pixel format variant", formatFlags ) ; } return success ; } //创建OpenGL贴图 bool CCTexturePVR :: createGLTexture ( ) { //保存宽高 unsigned int width = m_uWidth ; unsigned int height = m_uHeight ; GLenum err ; //如果文件中有多级纹理 if (m_uNumberOfMipmaps > 0 ) { //先释放原来的纹理 if (m_uName ! = 0 ) { ccGLDeleteTexture (m_uName ) ; } //像素数据每字节对齐 glPixelStorei (GL_UNPACK_ALIGNMENT, 1 ) ; //产生OpenGL贴图 glGenTextures ( 1, &m_uName ) ; glBindTexture (GL_TEXTURE_2D, m_uName ) ; // 如果无多级纹理，设置最小滤波方式为线性过滤，产生抗锯齿效果。 if (m_uNumberOfMipmaps == 1 ) { glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR ) ; } else { //设置最小滤波方式为最近点采样,这种方式有锯齿。 glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST ) ; } //设置最大滤波方式为线性过滤 glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR ) ; //设置贴图的横向纹理寻址模式为边缘截取模式。总是忽略边界。 glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE ) ; //设置贴图的纵向纹理寻址模式为边缘截取模式。总是忽略边界。 glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE ) ; } //检错 CHECK_GL_ERROR_DEBUG ( ) ; // clean possible GL error //取得对应格式的相关信息。 GLenum internalFormat = tableFormats [m_uTableFormatIndex ] [kCCInternalOpenGLInternalFormat ] ; GLenum format = tableFormats [m_uTableFormatIndex ] [kCCInternalOpenGLFormat ] ; GLenum type = tableFormats [m_uTableFormatIndex ] [kCCInternalOpenGLType ] ; bool compressed = ( 0 == tableFormats [m_uTableFormatIndex ] [kCCInternalCompressedImage ] ) ? false : true ; // 循环产生多级纹理贴图。 for ( unsigned int i = 0 ; i < m_uNumberOfMipmaps ; ++i ) { //检查配置信息是否支持压缩格式。 if (compressed && ! CCConfiguration :: sharedConfiguration ( ) - >supportsPVRTC ( ) ) { CCLOG ( "cocos2d: WARNING: PVRTC images are not supported" ) ; return false ; } //取得当前级别的图像块的像素数据地址和长度。 unsigned char *data = m_asMipmaps [i ]. address ; unsigned int datalen = m_asMipmaps [i ]. len ; //如果是压缩格式，则产生压缩格式的贴图。 if (compressed ) { glCompressedTexImage2D (GL_TEXTURE_2D, i, internalFormat, width, height, 0, datalen, data ) ; } else { //产生一般格式的贴图。 glTexImage2D (GL_TEXTURE_2D, i, internalFormat, width, height, 0, format, type, data ) ; } //如果是非2的幂次方大小，则提示。 if (i > 0 && (width ! = height || ccNextPOT (width ) ! = width ) ) { CCLOG ( "cocos2d: TexturePVR. WARNING. Mipmap level %u is not squared. Texture won't render correctly. width=%u != height=%u", i, width, height ) ; } //检错 err = glGetError ( ) ; if (err ! = GL_NO_ERROR ) { CCLOG ( "cocos2d: TexturePVR: Error uploading compressed texture level: %u . glError: 0x%04X", i, err ) ; return false ; } //变为原来大小的1/2。 width = MAX (width >> 1, 1 ) ; height = MAX (height >> 1, 1 ) ; } return true ; } //成员函数：加载PVR图片 bool CCTexturePVR :: initWithContentsOfFile ( const char * path ) { unsigned char * pvrdata = NULL ; int pvrlen = 0 ; //定义字符串变量，存储转换为小写的路径字符串。 std :: string lowerCase (path ) ; for ( unsigned int i = 0 ; i < lowerCase. length ( ) ; ++i ) { lowerCase [i ] = tolower (lowerCase [i ] ) ; } //检查是否是ccz格式。 if (lowerCase. find ( ".ccz" ) ! = std :: string :: npos ) { //调用压缩库函数将文件数据读取到为pvrdata申请的内存中。取得其大小存入pvrlen变量中。 pvrlen = ZipUtils :: ccInflateCCZFile (path, &pvrdata ) ; } //检查是否是gz格式。 else if (lowerCase. find ( ".gz" ) ! = std :: string :: npos ) { //调用压缩库函数将文件数据读取到为pvrdata申请的内存中。取得其大小存入pvrlen变量中。 pvrlen = ZipUtils :: ccInflateGZipFile (path, &pvrdata ) ; } else { //普通PVR文件，将文件数据读取到一块内存中返回给pvrdata。取得其大小存入pvrlen变量中。 pvrdata = CCFileUtils :: sharedFileUtils ( ) - >getFileData (path, "rb", ( unsigned long * ) ( &pvrlen ) ) ; } //如果读取失败则返回 if (pvrlen < 0 ) { this - >release ( ) ; return false ; } m_uNumberOfMipmaps = 0 ; m_uName = 0 ; m_uWidth = m_uHeight = 0 ; m_bHasAlpha = false ; m_bRetainName = false ; //如果解压数据失败则返回。 //解压后，如果创建贴图失败则返回。 if ( !unpackPVRData (pvrdata, pvrlen ) || !createGLTexture ( ) ) { CC_SAFE_DELETE_ARRAY (pvrdata ) ; this - >release ( ) ; return false ; } //释放数据占用的内存。 CC_SAFE_DELETE_ARRAY (pvrdata ) ; return true ; } //导出的静态函数：加载PVR图片 CCTexturePVR * CCTexturePVR :: pvrTextureWithContentsOfFile ( const char * path ) { return CCTexturePVR :: create (path ) ; } //静态函数：加载PVR图片 CCTexturePVR * CCTexturePVR :: create ( const char * path ) { //new 一个新的CCTexturePVR CCTexturePVR * pTexture = new CCTexturePVR ( ) ; if (pTexture ) { //调用成员函数加载PVR图片 if (pTexture - >initWithContentsOfFile (path ) ) { //如果成功,设置交由内存管理器使用引用计数器进行内存管理。 pTexture - >autorelease ( ) ; } else { //否则释放纹理 delete pTexture ; pTexture = NULL ; } } //返回这个CCTexturePVR return pTexture ; } NS_CC_END |