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July 14 2010
MachWerx » Blog Archive » glBlendFunc()
If you’re doing 3D graphics on the iPhone, you’re mostly dealing with OpenGL. And if you’re doing OpenGL, you’re using glBlendFunc(GLenum source_factor, GLenum destination_factor) to indicate how polygons draw on top of each other. The way it works is it multiplies a source image (what you’re putting on top) by something, multiplies the destination image (the background) by something, and adds the two results together. The glBlendFunc() specifies what those two somethings are.MachWerx » Blog Archive » glBlendFunc()
If you’re doing 3D graphics on the iPhone, you’re mostly dealing with OpenGL. And if you’re doing OpenGL, you’re using glBlendFunc(GLenum source_factor, GLenum destination_factor) to indicate how polygons draw on top of each other. The way it works is it multiplies a source image (what you’re putting on top) by something, multiplies the destination image (the background) by something, and adds the two results together. The glBlendFunc() specifies what those two somethings are.
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