How to Fix Color Banding on Mac OS X

@natweiss wrote:

Hi all. I'm experiencing some color banding when running my game (Songbringer) on an older laptop. Here's the code I'm using to set up the OpenGL context attributes:

GLContextAttrs attrs = {8, 8, 8, 0, 32, 0};
GLView::setGLContextAttrs(attrs);
Director::getInstance()->setOpenGLView(GLViewImpl::createWithRect(kTitle, rect, 1.0f));

Here's what the game looks like on a modern Macbook Pro:

1.png1280x730 84.7 KB

And here's what it looks like on the older Macbook Pro:

2.png1280x731 40.8 KB

Here's the information I could gather using OpenGL Extension Viewer:

3.png951x564 97.1 KB

4.png951x647 81.1 KB

5.png951x647 79.9 KB

Two theories:

1. Maybe the context is not being applied and the default is being used?

   GLContextAttrs GLView::_glContextAttrs = {5, 6, 5, 0, 16, 0};

2. Maybe this older laptop can only support ARGB8888 and not RGBA8888 and GLFW or cocos2d-x doesn't support that?

Any insight on the matter would be greatly appreciated.

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