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//------------------------------------------------------------------
// Shader file for NVIDIA Ansel
//------------------------------------------------------------------
//------------------------------------------------------------------
// Constants
//------------------------------------------------------------------
#define PixelSize rcp(screenSize) //x = Pixel width, y = Pixel height
cbuffer globalParams
{
float2 screenSize; //x = screen width, y = screen height
int captureState;
float4 tileUV; //xy - top left tile coordinate, zw - bottom right tile coordinate
}
cbuffer controlBuf
{
float g_sldSharpen;
float g_sldClarity;
float g_sldHDR;
float g_sldBloom;
}
Texture2D texOriginalColor;
Texture2D texBlurred;
SamplerState SamplerLinear;
float4 ScaleableGaussianBlurLinear(Texture2D tex,
float2 uv,
int nSteps,
float2 axis,
float2 texelsize)
{
float norm = -1.35914091423 / (nSteps * nSteps);
float4 accum = tex.Sample(SamplerLinear, uv);
float2 offsetinc = axis * texelsize;
float divisor = 0.5; //exp(0) * 0.5
[loop]
for(float iStep = 1; iStep <= nSteps; iStep++)
{
float tapOffset = iStep * 2.0 - 0.5;
float tapWeight = exp(iStep * iStep * norm);
accum += tex.SampleLevel(SamplerLinear,uv + offsetinc * tapOffset,0) * tapWeight;
accum += tex.SampleLevel(SamplerLinear,uv - offsetinc * tapOffset,0) * tapWeight;
divisor += tapWeight;
}
accum /= 2.0 * divisor;
return accum;
}
float4 BoxBlur(Texture2D tex, float2 uv, float2 texelsize)
{
float3 blurData[8] =
{
float3( 0.5, 1.5,1.50),
float3( 1.5,-0.5,1.50),
float3(-0.5,-1.5,1.50),
float3(-1.5, 0.5,1.50),
float3( 2.5, 1.5,1.00),
float3( 1.5,-2.5,1.00),
float3(-2.5,-1.5,1.00),
float3(-1.5, 2.5,1.00),
};
float4 blur = 0.0;
for(int i=0; i<8; i++)
blur += tex.SampleLevel(SamplerLinear,uv + blurData[i].xy * texelsize, 0) * blurData[i].z;
blur /= (4 * 1.5) + (4 * 1.0);
return blur;
}
void PS_LargeBlur1(in float4 position : SV_POSITION, in float2 uv : TEXCOORD, out float4 color : SV_Target)
{
color = ScaleableGaussianBlurLinear(texOriginalColor, uv, 15, float2(1, 0), PixelSize);
}
void PS_SharpenClarity(in float4 position : SV_POSITION, in float2 uv : TEXCOORD, out float4 color : SV_Target)
{
color = texOriginalColor.Sample(SamplerLinear,uv);
float4 largeblur = ScaleableGaussianBlurLinear(texBlurred, uv, 15, float2(0, 1), PixelSize);
float4 smallblur = BoxBlur(texOriginalColor,uv, PixelSize);
float a = dot(color.rgb,float3(0.299,0.587,0.114));
float b = dot(largeblur.rgb,float3(0.299,0.587,0.114));
float c = dot(smallblur.rgb,float3(0.299,0.587,0.114));
//HDR Toning
float sqrta = sqrt(a);
float HDRToning = sqrta * lerp(sqrta*(2*a*b-a-2*b+2.0), (2*sqrta*b-2*b+1), b > 0.5); //modified soft light v1
color = color / (a+1e-6) * lerp(a,HDRToning,g_sldHDR);
//sharpen
float Sharpen = dot(color.rgb - smallblur.rgb, float3(0.299,0.587,0.114)); //need to recompute, as luma of color changed by hdr toning
float sharplimit = lerp(0.25,0.6,g_sldSharpen);
Sharpen = clamp(Sharpen,-sharplimit,sharplimit);
color.rgb = color.rgb / a * lerp(a,a+Sharpen,g_sldSharpen);
//clarity
float Clarity = (0.5 + a - b);
Clarity = lerp(2*Clarity + a*(1-2*Clarity), 2*(1-Clarity)+(2*Clarity-1)*rsqrt(a), a > b); //modified soft light v2
color.rgb *= lerp(1.0,Clarity,g_sldClarity);
//bloom
color.rgb = 1-(1-color.rgb)*(1-largeblur.rgb * g_sldBloom);
}