Shader "Hidden/Post FX/Monitors/Vectorscope Render"
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{
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SubShader
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{
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ZTest Always Cull Off ZWrite Off
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Fog { Mode off }
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CGINCLUDE
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#pragma fragmentoption ARB_precision_hint_fastest
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#pragma target 5.0
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#include "UnityCG.cginc"
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StructuredBuffer<uint> _Vectorscope;
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float2 _Size;
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float _Exposure;
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float Tonemap(float x, float exposure)
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{
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const float a = 6.2;
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const float b = 0.5;
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const float c = 1.7;
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const float d = 0.06;
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x *= exposure;
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x = max(0.0, x - 0.004);
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x = (x * (a * x + b)) / (x * (a * x + c) + d);
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return x * x;
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}
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float3 YuvToRgb(float3 c)
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{
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float R = c.x + 0.000 * c.y + 1.403 * c.z;
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float G = c.x - 0.344 * c.y - 0.714 * c.z;
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float B = c.x - 1.773 * c.y + 0.000 * c.z;
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return float3(R, G, B);
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}
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float4 FragBackground(v2f_img i) : SV_Target
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{
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i.uv.x = 1.0 - i.uv.x;
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float2 uv = i.uv - (0.5).xx;
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float3 c = YuvToRgb(float3(0.5, uv.x, uv.y));
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float dist = sqrt(dot(uv, uv));
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float delta = fwidth(dist);
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float alphaOut = 1.0 - smoothstep(0.5 - delta, 0.5 + delta, dist);
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float alphaIn = smoothstep(0.495 - delta, 0.495 + delta, dist);
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uint2 uvI = i.pos.xy;
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uint v = _Vectorscope[uvI.x + uvI.y * _Size.x];
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float vt = saturate(Tonemap(v, _Exposure));
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float4 color = float4(lerp(c, (0.0).xxx, vt), alphaOut);
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color.rgb += alphaIn;
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return color;
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}
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float4 FragNoBackground(v2f_img i) : SV_Target
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{
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i.uv.x = 1.0 - i.uv.x;
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float2 uv = i.uv - (0.5).xx;
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float dist = sqrt(dot(uv, uv));
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float delta = fwidth(dist);
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float alphaOut = 1.0 - smoothstep(0.5 - delta, 0.5 + delta, dist);
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float alphaIn = smoothstep(0.495 - delta, 0.495 + delta, dist);
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uint2 uvI = i.pos.xy;
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uint v = _Vectorscope[uvI.x + uvI.y * _Size.x];
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float vt = saturate(Tonemap(v, _Exposure));
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float4 color = float4((1.0).xxx, vt + alphaIn * alphaOut);
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return color;
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}
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ENDCG
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// (0)
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Pass
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{
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CGPROGRAM
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#pragma vertex vert_img
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#pragma fragment FragBackground
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ENDCG
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}
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// (1)
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Pass
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{
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CGPROGRAM
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#pragma vertex vert_img
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#pragma fragment FragNoBackground
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ENDCG
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}
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}
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FallBack off
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}
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