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並前往https://groups.google.com/d/topic/comp.graphics.api.opengl/akAemtl0hWY

glReadPixels( ) is slow!!! - Google Groups

found glReadPixels( ) to be horribly slow. ... possible? IE, can I lock a pbuffer using the information available? ... "unusual" to me. ... ATI Radeon 8500 video card ...

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