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並前往https://software.intel.com/content/www/us/en/develop/articles/opengl-performance-tips-avoid-opengl-calls-that-synchronize-cpu-and-gpu.html

Avoid OpenGL Calls that Synchronize CPU and GPU - Intel ...

If you need to use glReadPixels() do so in conjunction with Pixel Buffer Objects. Use glFlush() with caution; if you must synchronize between ...

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