程序運行截圖如下：

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看著很炫酷：其實是圖片炫酷

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程序源碼如下：

void Init() {glMatrixMode(GL_PROJECTION);gluPerspective(50.0f, 800.0f / 600.0f, 0.1f, 1000.0f);glMatrixMode(GL_MODELVIEW);glLoadIdentity();int nFileSize = 0;unsigned char *bmpFileContent = LoadFileContent("Res/test.bmp", nFileSize);int bmpWidth = 0, bmpHeight = 0;unsigned char*pixelData = DecodeBMP(bmpFileContent, bmpWidth, bmpHeight);//最后一個參數傳GL_RGB因為BMP圖無α通道texture = CreateTexture2D(pixelData, bmpWidth, bmpHeight, GL_RGB); //創建OpenGL紋理對象 }void Draw() {glClearColor(0.0f, 0.0f, 0.0f, 1.0f);glClear(GL_COLOR_BUFFER_BIT);glEnable(GL_TEXTURE_2D); //開啟2D紋理glBindTexture(GL_TEXTURE_2D, texture);//將當前紋理設置為新創建的紋理對象glBegin(GL_QUADS);glColor4ub(255, 255, 255, 255);glTexCoord2f(0.0f, 0.0f);glVertex3f(-0.1f, -0.1f, -0.4f);glTexCoord2f(1.0f, 0.0f);glVertex3f(0.1f, -0.1f, -0.4f);glTexCoord2f(1.0f, 1.0f);glVertex3f(0.1f, 0.1f, -0.4f);glTexCoord2f(0.0f, 1.0f);glVertex3f(-0.1f, 0.1f, -0.4f);glEnd(); }

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其中LoadFileContext函數如下：

unsigned char * LoadFileContent(const char *path, int &filesize) {unsigned char*fileContent = nullptr;filesize = 0;FILE*pFile = fopen(path, "rb");if (pFile) {fseek(pFile, 0, SEEK_END);int nLen = ftell(pFile);if (nLen > 0) {rewind(pFile);fileContent = new unsigned char[nLen + 1];fread(fileContent, sizeof(unsigned char), nLen, pFile);fileContent[nLen] = '\0';filesize = nLen;}fclose(pFile);}return fileContent; }

DecodeBMP函數如下：

unsigned char* DecodeBMP(unsigned char*bmpFileData, int&width, int&height) {if (0x4D42 == *((unsigned short*)bmpFileData)) {int pixelDataOffset = *((int*)(bmpFileData + 10));width = *((int*)(bmpFileData + 18));height = *((int*)(bmpFileData + 22));unsigned char*pixelData = bmpFileData + pixelDataOffset;for (int i = 0; i < width*height * 3; i += 3) {unsigned char temp = pixelData[i];pixelData[i] = pixelData[i + 2];pixelData[i + 2] = temp;}return pixelData;}return nullptr; }

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createTexture2D函數如下：

GLuint CreateTexture2D(unsigned char*pixelData, int width, int height, GLenum type) {GLuint texture;glGenTextures(1, &texture);glBindTexture(GL_TEXTURE_2D, texture);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);glTexImage2D(GL_TEXTURE_2D, 0, type, width, height, 0, type, GL_UNSIGNED_BYTE, pixelData);glBindTexture(GL_TEXTURE_2D, 0);return texture; }

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總結

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