Use glCopyImageSubData() when it's available #8259
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There's 4 different extensions providing this functionality. NV is supported on desktop and mobile, EXT/OES on mobile, and ARB on desktop. Mostly these are only supported by desktop cards and NVIDIA mobile. Good improvement in performance on NVIDIA when blit is called a lot, since it doesn't need to rebind anything or change state. Example is in desert city in Tales of Phantasia.
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We really need a better GL loader to sort these out for us .. but, cool. |
hrydgard
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Dec 6, 2015
Use glCopyImageSubData() when it's available
This was referenced Dec 28, 2015
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Good improvement in Rockman Dash 2 some areas,175% to 650%,D3D is very slow just 65%. |
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There's 4 different extensions providing this functionality. NV is supported on desktop and mobile, EXT/OES on mobile, and ARB on desktop. EXT/OES are identical, and ARB is very slightly different.
Mostly these are only supported by desktop cards and NVIDIA mobile.
Good improvement in performance on NVIDIA when blit is called a lot, since it doesn't need to rebind anything or change state.
A good example is in a desert city in Tales of Phantasia. Previously, this was much faster on Direct3D 9 than OpenGL (it's still faster, but not nearly by as much.) Note that even on a fairly modern graphics card, this change brings speed in that area from ~188% to ~365%.
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