140 lines
2.9 KiB
Plaintext
140 lines
2.9 KiB
Plaintext
/*
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* bilinear low res scaling, samples 8 pixels of a larger image to scale to a
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* low resolution image below half size
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*/
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#include "color.effect"
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uniform float4x4 ViewProj;
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uniform texture2d image;
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uniform float multiplier;
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sampler_state textureSampler {
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Filter = Linear;
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AddressU = Clamp;
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AddressV = Clamp;
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};
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struct VertData {
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float4 pos : POSITION;
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float2 uv : TEXCOORD0;
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};
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VertData VSDefault(VertData v_in)
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{
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VertData vert_out;
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vert_out.pos = mul(float4(v_in.pos.xyz, 1.0), ViewProj);
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vert_out.uv = v_in.uv;
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return vert_out;
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}
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float4 pixel(float2 uv)
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{
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return image.Sample(textureSampler, uv);
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}
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float4 DrawLowresBilinear(VertData f_in)
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{
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float2 uv = f_in.uv;
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float2 stepxy = float2(ddx(uv.x), ddy(uv.y));
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float2 stepxy1 = stepxy * 0.0625;
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float2 stepxy3 = stepxy * 0.1875;
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float2 stepxy5 = stepxy * 0.3125;
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float2 stepxy7 = stepxy * 0.4375;
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// Simulate Direct3D 8-sample pattern
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float4 out_color;
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out_color = pixel(uv + float2( stepxy1.x, -stepxy3.y));
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out_color += pixel(uv + float2(-stepxy1.x, stepxy3.y));
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out_color += pixel(uv + float2( stepxy5.x, stepxy1.y));
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out_color += pixel(uv + float2(-stepxy3.x, -stepxy5.y));
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out_color += pixel(uv + float2(-stepxy5.x, stepxy5.y));
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out_color += pixel(uv + float2(-stepxy7.x, -stepxy1.y));
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out_color += pixel(uv + float2( stepxy3.x, stepxy7.y));
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out_color += pixel(uv + float2( stepxy7.x, -stepxy7.y));
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return out_color * 0.125;
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}
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float4 PSDrawLowresBilinearRGBA(VertData f_in) : TARGET
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{
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return DrawLowresBilinear(f_in);
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}
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float4 PSDrawLowresBilinearRGBAMultiply(VertData f_in) : TARGET
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{
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float4 rgba = DrawLowresBilinear(f_in);
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rgba.rgb *= multiplier;
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return rgba;
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}
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float4 PSDrawLowresBilinearRGBATonemap(VertData f_in) : TARGET
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{
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float4 rgba = DrawLowresBilinear(f_in);
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rgba.rgb = rec709_to_rec2020(rgba.rgb);
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rgba.rgb = reinhard(rgba.rgb);
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rgba.rgb = rec2020_to_rec709(rgba.rgb);
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return rgba;
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}
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float4 PSDrawLowresBilinearRGBAMultiplyTonemap(VertData f_in) : TARGET
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{
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float4 rgba = DrawLowresBilinear(f_in);
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rgba.rgb *= multiplier;
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rgba.rgb = rec709_to_rec2020(rgba.rgb);
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rgba.rgb = reinhard(rgba.rgb);
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rgba.rgb = rec2020_to_rec709(rgba.rgb);
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return rgba;
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}
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float4 PSDrawLowresBilinearRGBADivide(VertData f_in) : TARGET
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{
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float4 rgba = DrawLowresBilinear(f_in);
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rgba.rgb *= max(1. / rgba.a, 0.);
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return rgba;
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}
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technique Draw
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{
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pass
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{
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vertex_shader = VSDefault(v_in);
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pixel_shader = PSDrawLowresBilinearRGBA(f_in);
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}
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}
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technique DrawMultiply
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{
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pass
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{
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vertex_shader = VSDefault(v_in);
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pixel_shader = PSDrawLowresBilinearRGBAMultiply(f_in);
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}
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}
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technique DrawTonemap
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{
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pass
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{
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vertex_shader = VSDefault(v_in);
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pixel_shader = PSDrawLowresBilinearRGBATonemap(f_in);
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}
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}
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technique DrawMultiplyTonemap
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{
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pass
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{
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vertex_shader = VSDefault(v_in);
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pixel_shader = PSDrawLowresBilinearRGBAMultiplyTonemap(f_in);
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}
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}
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technique DrawAlphaDivide
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{
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pass
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{
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vertex_shader = VSDefault(v_in);
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pixel_shader = PSDrawLowresBilinearRGBADivide(f_in);
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}
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}
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