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A direct sampler shader for debugging
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| %YAML 1.1 | ||
| %TAG !u! tag:unity3d.com,2011: | ||
| --- !u!21 &2100000 | ||
| Material: | ||
| serializedVersion: 6 | ||
| m_ObjectHideFlags: 0 | ||
| m_CorrespondingSourceObject: {fileID: 0} | ||
| m_PrefabInstance: {fileID: 0} | ||
| m_PrefabAsset: {fileID: 0} | ||
| m_Name: SamplerMaterial | ||
| m_Shader: {fileID: 4800000, guid: 48b99b800ea72b54da0df56e5c073d00, type: 3} | ||
| m_ShaderKeywords: | ||
| m_LightmapFlags: 4 | ||
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| stringTagMap: {} | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| Shader "Unlit/SamplerShader" | ||
| { | ||
| Properties | ||
| { | ||
| _Color ("Color", Color) = (1,1,1,1) | ||
| } | ||
| SubShader | ||
| { | ||
| Tags { "RenderType"="Opaque" } | ||
| LOD 100 | ||
|
|
||
| Pass | ||
| { | ||
| CGPROGRAM | ||
| #pragma vertex vert | ||
| #pragma fragment frag | ||
| #pragma target 4.5 | ||
| /*#include "Assets/ShaderDebugger/debugger.cginc"*/ | ||
|
|
||
| #include "UnityCG.cginc" | ||
|
|
||
| struct appdata | ||
| { | ||
| float4 vertex : POSITION; | ||
| float3 normal : NORMAL; | ||
| }; | ||
|
|
||
| struct v2f | ||
| { | ||
| float4 vertex : SV_POSITION; | ||
| float4 worldPos : TEXCOORD0; | ||
| float3 worldNormal : TEXCOORD1; | ||
| }; | ||
|
|
||
| float4 _Color; | ||
| float4x4 _CVCT_WorldToLightLocalMatrix; | ||
| float4 _CVCT_GridResolution; | ||
| sampler3D _CVCT_LightTex3d; | ||
|
|
||
| v2f vert (appdata v) | ||
| { | ||
| v2f o; | ||
| o.vertex = UnityObjectToClipPos(v.vertex); | ||
| o.worldPos = mul(unity_ObjectToWorld, v.vertex); | ||
| o.worldNormal = mul((float3x3)unity_ObjectToWorld, v.normal); | ||
| return o; | ||
| } | ||
|
|
||
| float light_at_point(v2f i) | ||
| { | ||
| float3 norm = mul((float3x3)_CVCT_WorldToLightLocalMatrix, i.worldNormal); | ||
| if (norm.z >= 0) | ||
| return 0; | ||
|
|
||
| /* the scale in this matrix is such that the 0th cascade corresponds to | ||
| the box from (-1,-1,-1) to (+1,+1,+1). */ | ||
| float3 pos = mul(_CVCT_WorldToLightLocalMatrix, i.worldPos).xyz; | ||
|
|
||
| float3 central_pos = abs(pos); | ||
| float central_distance = max(central_pos.x, max(central_pos.y, central_pos.z)); | ||
| /* central_distance => cascade: | ||
| <= 1 0 | ||
| <= 2 1 | ||
| <= 4 2 | ||
| <= 8 3 | ||
| */ | ||
| float cascade = ceil(log2(max(1.0, central_distance))); | ||
|
|
||
| pos *= pow(0.5, cascade); /* (-1,-1,-1) to (+1,+1,+1) in the right cascade */ | ||
| pos = pos * 0.5 + 0.5; /* (0,0,0) to (1,1,1) */ | ||
| pos.y += cascade; /* (0,c,0) to (1,1+c,1) */ | ||
| pos.y *= _CVCT_GridResolution.y; /* rescale along y */ | ||
|
|
||
| float light = pos.y < 1 ? tex3D(_CVCT_LightTex3d, pos).r : 1; | ||
|
|
||
| /*uint root = DebugFragment(i.vertex); | ||
| DbgValue4(root, float4(pos, light));*/ | ||
|
|
||
| return light * (-normalize(norm).z); | ||
| } | ||
|
|
||
| fixed4 frag (v2f i) : SV_Target | ||
| { | ||
| float4 col = _Color; | ||
| col *= light_at_point(i); | ||
| return col; | ||
| } | ||
| ENDCG | ||
| } | ||
| } | ||
| } |
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