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34 lines
1.1 KiB
Plaintext
34 lines
1.1 KiB
Plaintext
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;------------------------------------------------------------------------------
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; 4-tap filtering
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; Copyright (C) 2001 Microsoft Corporation
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; All rights reserved.
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;------------------------------------------------------------------------------
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xps.1.1
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; default filter is box filter, but this is easily overwritten using SetPixelShaderConstant
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; When setting a pixel shader constant, we must check to see if the
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; filter coefficient is negative, in which case we set the constant as a positive
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; number and negate the constant in the expression below.
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def c0, 0.25f, 0.25f, 0.25f, 0.25f
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def c1, 0.25f, 0.25f, 0.25f, 0.25f
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def c2, 0.25f, 0.25f, 0.25f, 0.25f
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def c3, 0.25f, 0.25f, 0.25f, 0.25f
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; source textures
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tex t0
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tex t1
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tex t2
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tex t3
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; simple way
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; mul r0, c0, t0
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; mad r0, c1, t1, r0
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; mad r0, c2, t2, r0
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; mad r0, c3, t3, r0
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; This has better precision (assuming the xmma_x2 intermediates don't overflow):
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xmma_x2 discard, discard, r0, c0, t0, c1, t1 ; 2 * (c0 * t0 + c1 * t1)
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xmma_x2 discard, discard, r1, c2, t2, c3, t3 ; 2 * (c2 * t2 + c3 * t3)
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add_d2 r0, r0, r1
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