顯示器使用一個紋理

至於說，我想顯示使用這裏的紋理轉換一個SDL_Surface文本轉換一個SDL_Surface文字是我的代碼：顯示器使用一個紋理

if (SDL_Init(SDL_INIT_VIDEO) == 0) { 

    //Create a surface 
    switch (method) { 
    case 2: // load a texture with SDL_Image: 
    { 
     surface = IMG_Load("../../../../../data/box3.png"); 
    } 
     break; 
    case 3: // load a texture with SDL_TTF: 

     SDL_Color textColor={ 255, 255, 0, 1 }; 
     if (TTF_Init() == 0){; 
      TTF_Font *font; 
      font = TTF_OpenFont("../../../../../data/Bedizen.ttf", 20); 
      if (font != NULL){ 
       qDebug() << TTF_FontFaceFamilyName(font); 
       surface = TTF_RenderText_Solid(font, ".....", textColor); 
      } 
      else 
       qDebug() << "Error (Font) : " << TTF_GetError(); 
     } 
     else 
      qDebug() << "Error (Font) : " << TTF_GetError(); 

     break; 
    } 

    if (surface != NULL){ 
     GLint nbOfColors; 
     GLenum texture_format = 0; 

     qDebug("surface : %dx%d/%dbpp/%d", surface->w, surface->h, 
         surface->format->BytesPerPixel, surface->pitch); 

     MemoryDump(surface->pixels, surface->pitch, surface->h, surface->format->BytesPerPixel); 

     // get the number of channels in the SDL surface 
     nbOfColors = surface->format->BytesPerPixel; 

     switch (nbOfColors) { 
     case 1: 
      texture_format = GL_ALPHA; 
      break; 
     case 3:  // no alpha channel 
      if (surface->format->Rmask == 0x000000ff) 
       texture_format = GL_RGB; 
      else 
       texture_format = GL_BGR; 
      break; 
     case 4:  // contains an alpha channel 
      if (surface->format->Rmask == 0x000000ff) 
       texture_format = GL_RGBA; 
      else 
       texture_format = GL_BGRA; 
      break; 
     default: 
      qDebug() << "Warning: the image is not truecolor..."; 
      break; 
     } 

     glEnable(GL_TEXTURE_2D); 
     // Have OpenGL generate a texture object handle for us 
     glGenTextures(1, &texture); 

     // Bind the texture object 
     glBindTexture(GL_TEXTURE_2D, texture); 

     // Set the texture's stretching properties 
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); 
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); 

     // Edit the texture object's image data using the information SDL_Surface gives us 
     glTexImage2D(GL_TEXTURE_2D, 0, nbOfColors, surface->w, surface->h, 0, 
           texture_format, GL_UNSIGNED_BYTE, surface->pixels); 
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); 
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); 

    } 
    else{ 
     qDebug() << "Error (SDL) : " << SDL_GetError(); 
    } 
}

與IMG_LOAD工作得非常好（）但沒有使用TTF_RenderText_Solid（），所以我設法通過自己找到它，起初我試圖從TTF_RTS（）中得到的曲面不是很好的像素映射，但是我能夠找到答案，這要歸功於自制內存傾倒它是好的。

來源

2013-05-16 Thomas Ayoub

-1，過深的縮進。 – genpfault

謝謝你，幫助我這麼辛苦。但你是對的，我編輯了我的帖子:) –

好吧，我失蹤了2號線在我的渲染循環：

glEnable(GL_BLEND); 
glBlendFunc(GL_SRC_COLOR, GL_ONE_MINUS_SRC_ALPHA);

來源

2013-05-18 10:32:44

顯示器使用一個紋理

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