OpenGL ES 2.0的纹理视网膜显示？(OpenGL ES 2.0 textures for

我有一个GLKView，在这里我试着画了几个立方体和我从一个视图中创建纹理，并将它们映射到多维数据集。然而，当我开始视网膜设备上的应用程序时，纹理尺寸正确的，但他们看上去很糟糕。我试图给GLKView的contentScaleFactor设置为主屏幕的规模 - 无济于事。我也试图乘以规模，这导致在看着脆纹理缓冲区大小，但均只有原来尺寸的1/4 ...

事不宜迟，我可以介绍你，我做了什么（不含上述表示乘法）：

GLKView

- (void)setupGL {

    UIScreen *mainScreen = [UIScreen mainScreen];
    const CGFloat scale = mainScreen.scale;
    self.contentScaleFactor = scale;
    self.layer.contentsScale = scale;

    glGenFramebuffers(1, &defaultFrameBuffer);
    glBindFramebuffer(GL_FRAMEBUFFER, defaultFrameBuffer);

    glGenRenderbuffers(1, &depthBuffer);
    glBindRenderbuffer(GL_RENDERBUFFER, depthBuffer);

    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, self.bounds.size.width, self.bounds.size.height);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depthBuffer);

    glGenRenderbuffers(1, &colorBuffer);
    glBindRenderbuffer(GL_RENDERBUFFER, colorBuffer);
    glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA4, self.bounds.size.width, self.bounds.size.height);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ARRAY, GL_RENDERBUFFER, colorBuffer);

    glEnable(GL_DEPTH_TEST);

}

在这里，我加载纹理

// make space for an RGBA image of the view
 GLubyte *pixelBuffer = (GLubyte *)malloc(
                                         4 *
                                         cV.bounds.size.width * 
                                         cV.bounds.size.height);

// create a suitable CoreGraphics context
CGColorSpaceRef colourSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context =
CGBitmapContextCreate(pixelBuffer,
                      cV.bounds.size.width, cV.bounds.size.height,
                      8, 4*cV.bounds.size.width,
                      colourSpace,
                      kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);
CGColorSpaceRelease(colourSpace);

// draw the view to the buffer
[cV.layer renderInContext:context];

// upload to OpenGL
glTexImage2D(GL_TEXTURE_2D, 0,
             GL_RGBA,
             cV.bounds.size.width, cV.bounds.size.height, 0,
             GL_RGBA, GL_UNSIGNED_BYTE, pixelBuffer);



glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);