98 lines
2.2 KiB
Text
98 lines
2.2 KiB
Text
/*
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* bilinear low res scaling, samples 9 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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uniform float4x4 ViewProj;
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uniform texture2d image;
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uniform float4x4 color_matrix;
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uniform float2 base_dimension_i;
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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 v_in)
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{
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float2 stepxy = base_dimension_i;
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float4 out_color;
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out_color = pixel(v_in.uv);
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out_color += pixel(v_in.uv + float2(-stepxy.x, -stepxy.y));
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out_color += pixel(v_in.uv + float2(-stepxy.x, 0.0));
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out_color += pixel(v_in.uv + float2(-stepxy.x, stepxy.y));
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out_color += pixel(v_in.uv + float2( 0.0, -stepxy.y));
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out_color += pixel(v_in.uv + float2( 0.0, stepxy.y));
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out_color += pixel(v_in.uv + float2( stepxy.x, -stepxy.y));
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out_color += pixel(v_in.uv + float2( stepxy.x, 0.0));
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out_color += pixel(v_in.uv + float2( stepxy.x, stepxy.y));
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return out_color / float4(9.0, 9.0, 9.0, 9.0);
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}
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float4 PSDrawLowresBilinearRGBA(VertData v_in) : TARGET
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{
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return DrawLowresBilinear(v_in);
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}
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float4 PSDrawLowresBilinearRGBADivide(VertData v_in) : TARGET
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{
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float4 rgba = DrawLowresBilinear(v_in);
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float alpha = rgba.a;
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float multiplier = (alpha > 0.0) ? (1.0 / alpha) : 0.0;
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return float4(rgba.rgb * multiplier, alpha);
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}
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float4 PSDrawLowresBilinearMatrix(VertData v_in) : TARGET
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{
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float3 rgb = DrawLowresBilinear(v_in).rgb;
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float3 yuv = mul(float4(saturate(rgb), 1.0), color_matrix).xyz;
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return float4(yuv, 1.0);
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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(v_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(v_in);
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}
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}
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technique DrawMatrix
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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 = PSDrawLowresBilinearMatrix(v_in);
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}
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}
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