108 lines
4.2 KiB
Plaintext
108 lines
4.2 KiB
Plaintext
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Shader "GridFull/infTutorialDouble"
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{
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Properties
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{
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//_PlaneLevel("High",float) = 0
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}
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SubShader
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{
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Tags{
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"RenderPipeline"="UniversalRenderPipeline"
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"RenderType"="Transparent"
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"IgnoreProjector"="True"
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"Queue"="Transparent"
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}
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Pass
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{
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Blend SrcAlpha OneMinusSrcAlpha
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ZWrite Off
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Cull off
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HLSLPROGRAM
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
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#pragma vertex vert
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#pragma fragment frag
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//float _PlaneLevel;
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struct Attributes
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{
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float4 positionOS : POSITION;
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float2 uv : TEXCOORD0;
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};
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struct Varings
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{
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float4 positionCS : SV_POSITION;
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float3 nearPoint : TEXCOORD0;
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float3 farPoint : TEXCOORD1;
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};
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float3 TransformHClipToWorld(float3 positionCS, float4x4 inv_VP)
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{
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float4 unprojectedPoint = mul(inv_VP, float4(positionCS, 1.0));
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return unprojectedPoint.xyz / unprojectedPoint.w;
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}
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Varings vert(Attributes input)
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{
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//此shader专用于quad mesh
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//所以使用4个顶点的uv值进行变换 作为 裁切空间的坐标
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//保证这是一个覆盖全屏幕的渲染
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Varings o;
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float2 uv = input.uv * 2.0 - 1.0;
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//默认情况下，Zndc = 1是远平面
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half farPlane = 1;
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half nearPlane = 0;
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#if defined(UNITY_REVERSED_Z)
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//有时候会反转z
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farPlane = 1 - farPlane;
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nearPlane = 1 - nearPlane;
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#endif
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float4 position = float4(uv, farPlane, 1);
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float3 nearPoint = TransformHClipToWorld(float3(position.xy, nearPlane), UNITY_MATRIX_I_VP);
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float3 farPoint = TransformHClipToWorld(float3(position.xy, farPlane), UNITY_MATRIX_I_VP);
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o.positionCS = position;
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o.nearPoint = nearPoint;
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o.farPoint = farPoint;
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return o;
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}
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float computeViewZ(float3 pos) {
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float4 clip_space_pos = mul(UNITY_MATRIX_VP, float4(pos.xyz, 1.0));
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float viewZ = clip_space_pos.w; //根据projection矩阵定义，positionCS.w = viewZ
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return viewZ;
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}
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half Grid(float2 uv){
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float2 derivative = fwidth(uv);
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uv = frac(uv - 0.5); //中心对齐
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uv = abs(uv - 0.5);
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uv = uv / derivative;
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float min_value = min(uv.x, uv.y);
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half grid = 1.0 - min(min_value, 1.0);
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return grid;
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}
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half4 frag(Varings input) : SV_TARGET{
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//计算地平面
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float t = -input.nearPoint.y / (input.farPoint.y - input.nearPoint.y);
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//float3 positionWS = input.nearPoint + t * (input.farPoint - input.nearPoint);
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//half ground = step(_PlaneLevel, t);
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float3 positionWS = input.nearPoint + t * (input.farPoint - input.nearPoint);
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half ground = step(-0.05, t);
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float3 cameraPos = _WorldSpaceCameraPos;
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float fromOrigin = abs(cameraPos.y);
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float viewZ = computeViewZ(positionWS);
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float2 uv = positionWS.xz;
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//计算grid
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float fading = max(0.0, 1.0 - viewZ / 150);
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half smallGrid = Grid(uv) * lerp(1, 0, min(1.0, fromOrigin / 100));
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half middleGrid = Grid(uv * 0.1) * lerp(1, 0, min(1.0, fromOrigin / 300));
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half largeGrid = Grid(uv * 0.01) * lerp(1, 0, min(1.0, fromOrigin / 800));
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//合并计算
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half grid = smallGrid + middleGrid + largeGrid;
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return half4(0.5, 0.5, 0.5 ,ground * grid * fading * 0.5); //顺便改色减淡一下
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}
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ENDHLSL
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}
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}
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}
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