ChromaKey_HDYCToRGB.pShader
3.3 KB
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/********************************************************************************
Copyright (C) 2012 Hugh Bailey <obs.jim@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
********************************************************************************/
uniform Texture2D diffuseTexture;
uniform float4x4 yuvMat;
uniform float4 outputColor;
uniform float4 keyBaseColor;
uniform float4 chromaKey;
uniform float2 pixelSize;
uniform float keySimilarity;
uniform float keyBlend;
uniform float keySpill;
uniform float gamma;
SamplerState textureSampler
{
AddressU = Clamp;
AddressV = Clamp;
Filter = Linear;
};
struct VertData
{
float4 pos : SV_Position;
float2 texCoord : TexCoord0;
};
float getSampleDist(float3 chromaKey, float3 yuvx)
{
return distance(chromaKey.yz, yuvx.yz*2.0);
}
float4 main(VertData input) : SV_Target
{
float4 yuvx = diffuseTexture.Sample(textureSampler, input.texCoord).grba;
//-----------------------------
float distVal = getSampleDist(chromaKey, yuvx.xyz);
distVal += getSampleDist(chromaKey, diffuseTexture.Sample(textureSampler, input.texCoord-pixelSize).grb);
distVal += getSampleDist(chromaKey, diffuseTexture.Sample(textureSampler, input.texCoord-float2(pixelSize.x, 0.0)).grb);
distVal += getSampleDist(chromaKey, diffuseTexture.Sample(textureSampler, input.texCoord-float2(pixelSize.x, -pixelSize.y)).grb);
distVal += getSampleDist(chromaKey, diffuseTexture.Sample(textureSampler, input.texCoord-float2(0.0, pixelSize.y)).grb);
distVal += getSampleDist(chromaKey, diffuseTexture.Sample(textureSampler, input.texCoord+float2(0.0, pixelSize.y)).grb);
distVal += getSampleDist(chromaKey, diffuseTexture.Sample(textureSampler, input.texCoord+float2(pixelSize.x, -pixelSize.y)).grb);
distVal += getSampleDist(chromaKey, diffuseTexture.Sample(textureSampler, input.texCoord+float2(pixelSize.x, 0.0)).grb);
distVal += getSampleDist(chromaKey, diffuseTexture.Sample(textureSampler, input.texCoord+pixelSize).grb);
distVal /= 9.0;
//-----------------------------
float baseMask = distVal - keySimilarity;
float fullMask = pow(saturate(baseMask/keyBlend), 1.5);
float spillVal = pow(saturate(baseMask/keySpill), 1.5);
//-----------------------------
float4 rgbx = mul(float4(yuvx.xyz, 1.0), yuvMat);
rgbx = float4(saturate(rgbx.rgb), fullMask);
//-----------------------------
float3 spillDesaturation = rgbx.rgb-keyBaseColor.rgb;
spillDesaturation.rgb += (keyBaseColor.r+keyBaseColor.g+keyBaseColor.b)*0.333333333;
rgbx.rgb = saturate(spillDesaturation)*(1.0-spillVal) + rgbx.rgb*spillVal;
//-----------------------------
rgbx.rgb = pow(rgbx.rgb, gamma);
return rgbx * outputColor;
}