SDL_image / C OpenGL程序：IMG_Load()生成模糊图像

original image http://i33.tinypic.com/2i1f3bp.jpg

我用这个图像是因为我发现它有各种文件格式(tga,tif,jpg,png,bmp)

代码 ：

SDL_Surface * texture;

//load an image to an SDL surface (i.e. a buffer)

texture = IMG_Load("/Users/Foo/Code/xcode/test/lena.bmp");

if(texture == NULL){
    printf("bad imagen");
    exit(1);
}

//create an OpenGL texture object 
glGenTextures(1,&textureObjOpenGLlogo);

//select the texture object you need
glBindTexture(GL_TEXTURE_2D,textureObjOpenGLlogo);

//define the parameters of that texture object
//how the texture should wrap in s direction
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_REPEAT);
//how the texture should wrap in t direction
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_REPEAT);
//how the texture lookup should be interpolated when the face is smaller than the texture
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
//how the texture lookup should be interpolated when the face is bigger than the texture
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);

//send the texture image to the graphic card
glTexImage2D(GL_TEXTURE_2D,GL_RGBA,texture->w,texture->h,GL_RGB,GL_UNSIGNED_BYTE,texture-> pixels);

//clean the SDL surface
SDL_FreeSurface(texture);

代码编译没有错误或警告！

我已经厌倦了所有的文件格式,但这总会产生丑陋的结果：

result http://i34.tinypic.com/ipbpxe.jpg

我正在使用：SDL_image 1.2.9& SDL 1.2.14,XCode 3.2低于10.6.2

有谁知道如何解决这个问题？