builtin_shaders-5.3.4f1学习-Unlit/Texture

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// Unlit shader. Simplest possible textured shader.// - no lighting// - no lightmap support// - no per-material colorShader "Unlit/Texture" {Properties {_MainTex ("Base (RGB)", 2D) = "white" {}}SubShader {Tags { "RenderType"="Opaque" }LOD 100Pass {  CGPROGRAM#pragma vertex vert#pragma fragment frag#pragma multi_compile_fog#include "UnityCG.cginc"struct appdata_t {float4 vertex : POSITION;float2 texcoord : TEXCOORD0;};struct v2f {float4 vertex : SV_POSITION;half2 texcoord : TEXCOORD0;UNITY_FOG_COORDS(1)};sampler2D _MainTex;float4 _MainTex_ST;v2f vert (appdata_t v){v2f o;o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);o.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex);UNITY_TRANSFER_FOG(o,o.vertex);return o;}fixed4 frag (v2f i) : SV_Target{fixed4 col = tex2D(_MainTex, i.texcoord);UNITY_APPLY_FOG(i.fogCoord, col);UNITY_OPAQUE_ALPHA(col.a);return col;}ENDCG}}}

SV_Target 与Color略有区别，大体相同，有可能是两者的位置前者是中心位置，后者不是，有0.5像素的偏移，这个以后确认下

Fog相关的几个函数

UnityCG.cginc中的解释

// multi_compile_fog Will compile fog variants.
// UNITY_FOG_COORDS(texcoordindex) Declares the fog data interpolator.
// UNITY_TRANSFER_FOG(outputStruct,clipspacePos) Outputs fog data from the vertex shader.
// UNITY_APPLY_FOG(fogData,col) Applies fog to color "col". Automatically applies black fog when in forward-additive pass.
// Can also use UNITY_APPLY_FOG_COLOR to supply your own fog color.

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