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  OS X CAOpenGLLayer how to enable OpenGL 3.2 core profile
  Add Date : 2018-11-21      
  In openGL programming OS X, we sometimes want to on their own OpenGL add more layers of certain coatings, have to use CAOpenGLLayer instead NSOpenGLView, because the children are being added on NSOpenGLView view will become invalid.

In fact, CAOpenGLLayer custom subclasses to additional support OpenGL Core Profile is very simple, it just needs to be rewritten

- (CGLPixelFormatObj) copyCGLPixelFormatForDisplayMask: (uint32_t) mask

The method can be. As shown in the following code:

// Override the parent class method, provide their own CGLPixelFormatObj
- (CGLPixelFormatObj) copyCGLPixelFormatForDisplayMask: (uint32_t) mask
    CGLPixelFormatAttribute attribs [] = {
        kCGLPFADisplayMask, 0,
        kCGLPFAColorSize, 24,
        // Use OpenGL 3.2 Core Profile
        kCGLPFAOpenGLProfile, (CGLPixelFormatAttribute) kCGLOGLPVersion_3_2_Core,
        // Use multi-sample
        kCGLPFASampleBuffers, (CGLPixelFormatAttribute) 1,
        kCGLPFASamples, (CGLPixelFormatAttribute) 4,
    // Set the kCGLPFADisplayMask passed over the display mask. This step is a must!
    attribs [1] = mask;
    CGLPixelFormatObj pixFormatObj = NULL;
    GLint numPixFormats = 0;
    CGLChoosePixelFormat (attribs, & pixFormatObj, & numPixFormats);
    return pixFormatObj;

Then we can add a reference to the object to do some CGLContextObj mark in your subclass. In addition, we must rewrite CAOpenGLLayer this method:

- (Void) drawInCGLContext: (CGLContextObj) glContext

            pixelFormat: (CGLPixelFormatObj) pixelFormat

            forLayerTime: (CFTimeInterval) timeInterval

            displayTime: (const CVTimeStamp *) timeStamp


For example, as shown in the following code:

- (Void) drawInCGLContext: (CGLContextObj) glContext
            pixelFormat: (CGLPixelFormatObj) pixelFormat
            forLayerTime: (CFTimeInterval) timeInterval
            displayTime: (const CVTimeStamp *) timeStamp
    // Here must first be passed in the context of the implementation as the current OpenGL context object, otherwise follow the status of the OpenGL settings will be invalid
    CGLSetCurrentContext (glContext);
    [Self setupContext];
    // MContext mainly used for determining whether the current OpenGL context has been set up, as well as references in the render method
    mContext = glContext;
    [Self render];


- (Void) setupContext custom methods, which do vertex set global enable certain OpenGL functional status, and set the viewport and so on.

- (Void) render custom method is used to do the real graphics rendering.

As shown in the following code:

- (Void) render
    // Render
    glClear (GL_COLOR_BUFFER_BIT);
    glDrawArrays (GL_LINE_STRIP, 0, 721);
    glFlush ();
    CGLFlushDrawable (mContext);

We then provide their own shader code, and can be loaded. These can be placed setupContext implement a custom method.

Of course, to be used in OS X OpenGL core profile must be introduced < OpenGL / gl3.h> header file. Currently, 3.2 core profile and a 4.1 core profile is the header files.
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