98 lines
2.4 KiB
HLSL
98 lines
2.4 KiB
HLSL
#ifndef __HI_Z__
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#define __HI_Z__
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#include "UnityCG.cginc"
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struct Input
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{
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float4 vertex : POSITION;
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float2 uv : TEXCOORD0;
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};
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struct Varyings
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{
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float4 vertex : SV_POSITION;
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float2 uv : TEXCOORD0;
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};
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Texture2D _MainTex;
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SamplerState sampler_MainTex;
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Texture2D _CameraDepthTexture;
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SamplerState sampler_CameraDepthTexture;
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float4 _MainTex_TexelSize;
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Varyings vertex(in Input input)
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{
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Varyings output;
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output.vertex = UnityObjectToClipPos(input.vertex.xyz);
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output.uv = input.uv;
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#if UNITY_UV_STARTS_AT_TOP
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if (_MainTex_TexelSize.y < 0)
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output.uv.y = 1. - input.uv.y;
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#endif
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return output;
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}
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float4 blit(in Varyings input) : SV_Target
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{
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//return _CameraDepthTexture.Sample(sampler_CameraDepthTexture, input.uv).r;
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#if UNITY_REVERSED_Z
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return _CameraDepthTexture.Sample(sampler_CameraDepthTexture, input.uv).r;
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#else
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return 1.0 - _CameraDepthTexture.Sample(sampler_CameraDepthTexture, input.uv).r;
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#endif
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}
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// Original code
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float4 reduce_original(in Varyings input) : SV_Target {
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#if SHADER_API_METAL
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int2 xy = (int2) (input.uv * (_MainTex_TexelSize.zw - 1.));
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float4 texels[2] = {
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float4(_MainTex.mips[0][xy].rg, _MainTex.mips[0][xy + int2(1, 0)].rg),
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float4(_MainTex.mips[0][xy + int2(0, 1)].rg, _MainTex.mips[0][xy + 1].rg)
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};
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float4 r = float4(texels[0].rb, texels[1].rb);
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float4 g = float4(texels[0].ga, texels[1].ga);
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#else
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float4 r = _MainTex.GatherRed(sampler_MainTex, input.uv);
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float4 g = _MainTex.GatherGreen(sampler_MainTex, input.uv);
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#endif
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float minimum = min(min(min(r.x, r.y), r.z), r.w);
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float maximum = max(max(max(g.x, g.y), g.z), g.w);
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return float4(minimum, maximum, 0., 0.);
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}
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// As we do not use maximum
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float4 reduce(in Varyings input) : SV_Target{
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#if SHADER_API_METAL
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int2 xy = (int2) (input.uv * (_MainTex_TexelSize.zw - 1.));
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float4 texels[2] = {
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float4(_MainTex.mips[0][xy].rg, _MainTex.mips[0][xy + int2(1, 0)].rg),
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float4(_MainTex.mips[0][xy + int2(0, 1)].rg, _MainTex.mips[0][xy + 1].rg)
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};
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float4 r = float4(texels[0].rb, texels[1].rb);
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//float4 g = float4(texels[0].ga, texels[1].ga);
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#else
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float4 r = _MainTex.GatherRed(sampler_MainTex, input.uv);
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//float4 g = _MainTex.GatherGreen(sampler_MainTex, input.uv);
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#endif
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float minimum = min(min(min(r.x, r.y), r.z), r.w);
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//float maximum = max(max(max(g.x, g.y), g.z), g.w);
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return float4(minimum, 0., 0., 0.);
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}
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#endif
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