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Using OpenGL ES 2.0, does the size of the texture impact how long it takes to fetch from a texture? I would think that it should be almost constant time to fetch a color.

Joey Carson
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  • By fetch, do you mean in the shader using a texture lookup function? – paulczak Apr 05 '13 at 18:34
  • Yes, that's exactly what i mean. – Joey Carson Apr 07 '13 at 22:20
  • Well, *"almost"* constant, like any other memory access. I would guess that a larger texture will cause texture accesses of neighbouring fragments to deviate by more texels and could thus cause the texture cahce to be not used as effectively. But other than those usual problems caused by any enlargement of memory, I cannot image another way the texture size could *directly* influence lookup speed (but I'm also not a GPU hardware architect). – Christian Rau Apr 17 '13 at 08:59

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