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139 lines
4.1 KiB
139 lines
4.1 KiB
// Copyright (c) <2015> <Playdead>
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// This file is subject to the MIT License as seen in the root of this folder structure (LICENSE.TXT)
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// AUTHOR: Lasse Jon Fuglsang Pedersen <lasse@playdead.com>
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#ifndef __DEPTH_CGINC__
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#define __DEPTH_CGINC__
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#include "UnityCG.cginc"
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uniform sampler2D_float _CameraDepthTexture;
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uniform float4 _CameraDepthTexture_TexelSize;
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#if UNITY_REVERSED_Z
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#define ZCMP_GT(a, b) (a < b)
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#else
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#define ZCMP_GT(a, b) (a > b)
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#endif
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float depth_resolve_linear(float z)
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{
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#if CAMERA_ORTHOGRAPHIC
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#if UNITY_REVERSED_Z
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return (1.0 - z) * (_ProjectionParams.z - _ProjectionParams.y) + _ProjectionParams.y;
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#else
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return z * (_ProjectionParams.z - _ProjectionParams.y) + _ProjectionParams.y;
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#endif
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#else
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return LinearEyeDepth(z);
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#endif
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}
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float depth_sample_linear(float2 uv)
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{
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return depth_resolve_linear(tex2D(_CameraDepthTexture, uv).x);
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}
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float3 find_closest_fragment_3x3(float2 uv)
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{
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float2 dd = abs(_CameraDepthTexture_TexelSize.xy);
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float2 du = float2(dd.x, 0.0);
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float2 dv = float2(0.0, dd.y);
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float3 dtl = float3(-1, -1, tex2D(_CameraDepthTexture, uv - dv - du).x);
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float3 dtc = float3( 0, -1, tex2D(_CameraDepthTexture, uv - dv).x);
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float3 dtr = float3( 1, -1, tex2D(_CameraDepthTexture, uv - dv + du).x);
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float3 dml = float3(-1, 0, tex2D(_CameraDepthTexture, uv - du).x);
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float3 dmc = float3( 0, 0, tex2D(_CameraDepthTexture, uv).x);
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float3 dmr = float3( 1, 0, tex2D(_CameraDepthTexture, uv + du).x);
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float3 dbl = float3(-1, 1, tex2D(_CameraDepthTexture, uv + dv - du).x);
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float3 dbc = float3( 0, 1, tex2D(_CameraDepthTexture, uv + dv).x);
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float3 dbr = float3( 1, 1, tex2D(_CameraDepthTexture, uv + dv + du).x);
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float3 dmin = dtl;
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if (ZCMP_GT(dmin.z, dtc.z)) dmin = dtc;
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if (ZCMP_GT(dmin.z, dtr.z)) dmin = dtr;
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if (ZCMP_GT(dmin.z, dml.z)) dmin = dml;
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if (ZCMP_GT(dmin.z, dmc.z)) dmin = dmc;
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if (ZCMP_GT(dmin.z, dmr.z)) dmin = dmr;
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if (ZCMP_GT(dmin.z, dbl.z)) dmin = dbl;
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if (ZCMP_GT(dmin.z, dbc.z)) dmin = dbc;
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if (ZCMP_GT(dmin.z, dbr.z)) dmin = dbr;
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return float3(uv + dd.xy * dmin.xy, dmin.z);
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}
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/* UNUSED: tested slower than branching
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float2 find_closest_fragment_3x3_packed(in float2 uv)
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{
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float2 dd = abs(_CameraDepthTexture_TexelSize.xy);
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float2 du = float2(dd.x, 0.0);
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float2 dv = float2(0.0, dd.y);
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const float s = 100000.0;
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float dtl = trunc(s * tex2D(_CameraDepthTexture, uv - dv - du).x) + 0.1010;// -+-+
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float dtc = trunc(s * tex2D(_CameraDepthTexture, uv - dv).x) + 0.0010;
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float dtr = trunc(s * tex2D(_CameraDepthTexture, uv - dv + du).x) + 0.0110;
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float dml = trunc(s * tex2D(_CameraDepthTexture, uv - du).x) + 0.1000;
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float dmc = trunc(s * tex2D(_CameraDepthTexture, uv).x) + 0.0000;
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float dmr = trunc(s * tex2D(_CameraDepthTexture, uv + du).x) + 0.0100;
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float dbl = trunc(s * tex2D(_CameraDepthTexture, uv + dv - du).x) + 0.1001;
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float dbc = trunc(s * tex2D(_CameraDepthTexture, uv + dv).x) + 0.0001;
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float dbr = trunc(s * tex2D(_CameraDepthTexture, uv + dv + du).x) + 0.0101;
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float enc = frac(min(dtl, min(dtc, min(dtr, min(dml, min(dmc, min(dmr, min(dbl, min(dbc, dbr)))))))));
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float ru = 0.0;
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float rv = 0.0;
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enc *= 10.0;
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ru -= trunc(enc);
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enc = frac(enc);
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enc *= 10.0;
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ru += trunc(enc);
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enc = frac(enc);
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enc *= 10.0;
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rv -= trunc(enc);
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enc = frac(enc);
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enc *= 10.0;
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rv += trunc(enc);
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enc = frac(enc);
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return uv + dd * float2(ru, rv);
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}*/
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float3 find_closest_fragment_5tap(float2 uv)
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{
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float2 dd = abs(_CameraDepthTexture_TexelSize.xy);
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float2 du = float2(dd.x, 0.0);
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float2 dv = float2(0.0, dd.y);
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float2 tl = -dv - du;
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float2 tr = -dv + du;
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float2 bl = dv - du;
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float2 br = dv + du;
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float dtl = tex2D(_CameraDepthTexture, uv + tl).x;
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float dtr = tex2D(_CameraDepthTexture, uv + tr).x;
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float dmc = tex2D(_CameraDepthTexture, uv).x;
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float dbl = tex2D(_CameraDepthTexture, uv + bl).x;
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float dbr = tex2D(_CameraDepthTexture, uv + br).x;
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float dmin = dmc;
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float2 dif = 0.0;
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if (ZCMP_GT(dmin, dtl)) { dmin = dtl; dif = tl; }
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if (ZCMP_GT(dmin, dtr)) { dmin = dtr; dif = tr; }
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if (ZCMP_GT(dmin, dbl)) { dmin = dbl; dif = bl; }
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if (ZCMP_GT(dmin, dbr)) { dmin = dbr; dif = br; }
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return float3(uv + dif, dmin);
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}
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#endif//__DEPTH_CGINC__
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