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/* YUV-to-RGBA Effect
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* Written by Ethan "flibitijibibo" Lee
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* http://www.flibitijibibo.com/
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*
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* This effect is based on the YUV-to-RGBA GLSL shader found in SDL.
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* Thus, it also released under the zlib license:
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* http://libsdl.org/license.php
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*/
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sampler samp0 : register(s0);
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sampler samp1 : register(s1);
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sampler samp2 : register(s2);
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void VS(inout float2 tex : TEXCOORD0,
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inout float4 pos : SV_Position)
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{
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pos.w = 1.0;
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}
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float4 PS(float2 tex : TEXCOORD0) : SV_Target0
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{
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const float3 offset = float3(-0.0625, -0.5, -0.5);
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/* More info about colorspace conversion:
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* http://www.equasys.de/colorconversion.html
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* http://www.equasys.de/colorformat.html
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*/
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#if 1
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/* ITU-R BT.709 */
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const float3 Rcoeff = float3(1.164, 0.000, 1.793);
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const float3 Gcoeff = float3(1.164, -0.213, -0.533);
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const float3 Bcoeff = float3(1.164, 2.112, 0.000);
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#else
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/* ITU-R BT.601 */
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const float3 Rcoeff = float3(1.164, 0.000, 1.596);
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const float3 Gcoeff = float3(1.164, -0.391, -0.813);
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const float3 Bcoeff = float3(1.164, 2.018, 0.000);
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#endif
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float3 yuv;
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yuv.x = tex2D(samp0, tex).w;
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yuv.y = tex2D(samp1, tex).w;
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yuv.z = tex2D(samp2, tex).w;
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yuv += offset;
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float4 rgba;
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rgba.x = dot(yuv, Rcoeff);
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rgba.y = dot(yuv, Gcoeff);
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rgba.z = dot(yuv, Bcoeff);
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rgba.w = 1.0;
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return rgba;
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}
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Technique T
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{
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Pass P
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{
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VertexShader = compile vs_3_0 VS();
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PixelShader = compile ps_3_0 PS();
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}
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}
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