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33 lines
1.3 KiB
Plaintext
33 lines
1.3 KiB
Plaintext
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;------------------------------------------------------------------------------
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; Depth of field by choosing a range of z values and using that to select
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; a blurred version of the original image.
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;
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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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; override with SetPixelShaderConstant
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def c0, 0.f, 0.f, 0.f, 0.f ; offset
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def c1, 0.f, 0.f, 1.f, 0.f ; slope x1
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def c2, 0.f, 0.f, 0.f, 0.f ; slope x4
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def c3, 0.f, 0.f, 0.f, 1.f ; slope x16
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def c4, 1.f, 1.f, 1.f, 0.498039215 ; 0x7f
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; source textures
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tex t0 ; z-buffer texture
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tex t1 ; pre-blurred texture
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; get the range of active z values
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sub r0, t0, c0 ; offset
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mul_x4 r1, c3, r0 ; scale x16
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mad_x4 r1, c2, r0, r1 ; scale x4
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mad r1, c1, r0, r1 ; scale x1
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sub r0.a, r1.a, c4.a ; subtract 0x7f from r1.a
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cnd r0.a, r0.a, zero.a, r1.b ; keep blue only if r1.a is not 0xff
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add r1.a, r1.a, r0.a ; add alpha + blue, the desired range is now mapped to [0,1]
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mul r1.a, r1_bx2.a, r1_bx2.a ; convert to -1,1 range and square to get parabola
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; modulate pre-blurred texture by depth range
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xfc r1.a, t1, zero, zero, zero, zero, r1.a
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