第33课加载压缩和未的tga文件

1、第三十三加载压缩和未压缩的TGA文:TGARLE开第三十三加载压缩和未压缩的TGA文:TGARLE开#ifndef #define / / / TEXTURE_H 要加入完成每件工作所需的标准头文件。在#define TGA_H #pragma I/OOpenGLibOpenGLOpenGLtypedef GLubyte* / bit要加入完成每件工作所需的标准头文件。在#define TGA_H #pragma I/OOpenGLibOpenGLOpenGLtypedef GLubyte* / bit/ / / glBindTexture/ 在*ImageData TGAtypedef GL

2、ubyte / typedef GLubyte / 6/ 每像素的字节数 (3 或 / / 图像类型 GL_RGB 或 / / / (24 或 TGA / / TGA120 2 0 0 0 0 0 / 图像类型 GL_RGB 或 / / / (24 或 TGA / / TGA120 2 0 0 0 0 0 0 0 0 0RLE010 0 0 0 0 0 0 0 0 0/ TGA/ TGApare12 0,0, pare12 pressedTGA(Texture *, char *, FILE pressedTGA(Texture *, char *, FILE 包含的文件（）#include

3、/ 不接下来要做的事情是看看第一个函数，名为LoadTGA()TGAbool LoadTGA(Texture * texture, char * 它（见包含的例子）了一个文件指针，然后打开由“filename”FILE * fTGA 不接下来要做的事情是看看第一个函数，名为LoadTGA()TGAbool LoadTGA(Texture * texture, char * 它（见包含的例子）了一个文件指针，然后打开由“filename”FILE * fTGA = fopen(filename, / if(fTGA = .Error code. return false;/ / 返回 12在fr

4、eadfalseif(fread(&tgaheader, sizeof(TGAHeader), 1, fTGA) = .Error code return 如果失败则返回 memcmp()/ pare, &tgaheader, sizeof(tgaheader) = TGApressedTGA(texture, filename, / pare, &tgaheader, TGApressedTGA(texture, filename, / .Error code memcmp()/ pare, &tgaheader, sizeof(tgaheader) = TGApressedTGA(text

5、ure, filename, / pare, &tgaheader, TGApressedTGA(texture, filename, / .Error code return / 返回 TGApressedTGA(Texture * texture, char * filename, *3LoadTGA没有丢的空间false/ 6if(fread(tga.header, sizeof(tga.header), 1, fTGA) = .Error code return / 返回 BPPtexture-texture-bpp = tga.header1 * 256 + tga.header0;

6、 / = * 256 + tga.header2; /.Error code return / 返回 BPPtexture-texture-bpp = tga.header1 * 256 + tga.header0; / = * 256 + tga.header2; / WidthHeighttga.Width = texture-tga.Height = texture-height; tga.Bpp = texture-bpp;/ Bpp1bpp2432/ if(texture-width height bpp (texture-bpp !=32).Error code &return /

7、 返回 设置图像的类型。bitGL_RGB，32 bit if(texture-bpp = / 24 bittexture-type 24bit,texture-type ixel = (tga.Bpp / / / tga.imageSize = ixel * tga.Width * malloc然确认内存已经分配，并且它不是NULL。如果出现了错误，则运行错误处理代码/ texture-imageData = (GLubyte if(texture-imageData = .Error codeixel = (tga.Bpp / / / tga.imageSize = ixel * tga.

8、Width * malloc然确认内存已经分配，并且它不是NULL。如果出现了错误，则运行错误处理代码/ texture-imageData = (GLubyte if(texture-imageData = .Error code / return / / if(fread(texture-imageData, 1, tga.imageSize, fTGA) != .Error code return / TGAOpenGLBGRRGBSteve ThomasGRRGBcswap = 0; cswap bpp = tga.header1 * 256 + = tga.header3 * 256

9、 + tga.header2; tga.Width = texture-width; tga.Height = texture-height; tga.Bpp = texture-bpp;if(texture-width height bpp != & (texture-bpp !=32)24) code ixel = (tga.Bpp / = ixel * tga.Width * false/ texture-imageData = (GLubyte if(texture-imageData = .Error code / return / 返回 下一需要决定组成图像的像素数它在变量“pix

10、elcount”pixelcount = tga.Height * tga.Width; / currentpixel = currentbyte = / / / GLubyte * colorbuffer = (GLubyte 让RLERAW，127，RAW先1，ata下一需要决定组成图像的像素数它在变量“pixelcount”pixelcount = tga.Height * tga.Width; / currentpixel = currentbyte = / / / GLubyte * colorbuffer = (GLubyte 让RLERAW，127，RAW先1，ata127，/

11、GLubyte kheader = Idkheader, sizeof(GLubyte), 1, fTGA) = 0) / .Error return / If It Fails, Return RAW1kheader / RAWc1RAW和一colorbuffer否为RAW头。如果是需要添加一个到变量之中以获取头之后的像素总数/ for(short counter = 0; counter kheader; / if(fread(colorbuffer, 1, .Error ixel, kheader / RAWc1RAW和一colorbuffer否为RAW头。如果是需要添加一个到变量之中以

12、获取头之后的像素总数/ for(short counter = 0; counter kheader; / if(fread(colorbuffer, 1, .Error ixel, fTGA) != return / colorbufferBGRRGBBGRARGBA，urrentbyte = / 写“R”ixel = +12 = colorbuffer1; /写“G” = colorbuffer0; / 写“B”/ 32texture-urrentbyte + 3 = colorbuffer3; / 写“A”/ currentbyte += / RLEckheader127c/ RLEkh

13、eader -= 127ID Bitif(fread(colorbuffer, 1, .Error ixel, fTGA) != / RLE颜色值拷贝到图像数据中，预处理RB/ for(shortc/ RLEkheader -= 127ID Bitif(fread(colorbuffer, 1, .Error ixel, fTGA) != / RLE颜色值拷贝到图像数据中，预处理RB/ for(short counter = 0; counter / 拷贝“R”kheader; texture-/ 拷贝“G”texture-/ 拷贝“B”texture-urrentbyte = + 1 = + 2 = / 32ixel = / 拷贝“A”t