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Why does glClear take so long? : r/opengl - Reddit

glClear may be waiting for any previous operations on the framebuffer to finish. You can use GL sync objects to check if previous operations ...

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查詢 「glClear」的人也找了：

  1. glClearColor
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  5. GL_COLOR_BUFFER_BIT
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  6. glDrawBuffer
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  8. glMatrixMode
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