shader - sampler2DRect vs samplerRect -

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as titled, wish know difference between sampler2drect , samplerrect

i googled, couldnt find clear , precise. found, looks me samplerrect somehow relict of past on nv cards, standardized later sampler2drect, right?

i think you're correct; there's both nvidia extension , arb history involved here.

in earliest version of arb_texture_rectangle, specification referred samplerrect , samplerrectshadow. can see changed in 2005.

i see references samplerrect working on nvidia cards circa 2005, , it's noteworthy nv_texture_rectangle identical arb_texture_rectangle except not specifying interactions glsl. so, appears nvidia had working implementation of arb extension quickly, based on draft of extension, because had similar vendor-specific extension shipping.

as of february 2005, arb_texture_rectangle specified sampler2drect, samplerrect (as say) relic of interval between march 2004 , february 2005.


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