深入分析Cocos2d-x 2.0中的“纹理”（三）
2013-06-05 00:40
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http://www.dapps.net/dev/gamedev/game-dev-engine-cocos2d-x-2-0-grain-3.html
CCTexturePVR.cpp:
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 | #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 |
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