shader 编程模块化开发的一些方法

创建一个

.cginc

后缀的cg文件，保存我们要复用的代码

#include "xxx.cginc"

.cginc

#ifndef MY_INCLUDE
#define MY_INCLUDE

// 你的cg代码内容

#endif

#include

#ifndef

#define

#endif

#include

#include "../xxx/xxx.cginc"

用

#define

创建宏，来在shader中进行判断

fixed4 MyCompute(fixed4 left, fixed4 right)
{
fixed4 result = fixed4(0);

#ifdef ADD_COMPUTE
result = left + right;
#elif
result = left * right;
#endif

return result;
}

ADD_COMPUTE

#include

#define ADD_COMPUTE

surface shader

#ifdef

还有一种特殊的写法，用

CGINCLUDE ... ENDCG

块包围的代码

Shader "Z_TestShader/XXX"
{
Properties
{
_MainTex ("Texture", 2D) = "white" {}
}

CGINCLUDE
#include "UnityCG.cginc"

uniform sampler2D _MainTex;

struct appdata_t
{
float4 vertex : POSITION;
half2 texcoord : TEXCOORD0;
};

struct v2f
{
float4 vertex : SV_POSITION;
half2 texcoord : TEXCOORD0;
};

v2f vert (appdata_t v)
{
v2f o;
o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
o.texcoord = v.texcoord;
return o;
}

fixed4 frag (v2f i) : COLOR
{
fixed4 col = tex2D(_MainTex , i.texcoord);
fixed4 lum = Luminance(col);
return lum;
}
ENDCG

SubShader
{
ZTest Always  ZWrite Off Cull Off Blend Off
Fog { Mode off }

Pass
{
CGPROGRAM

#pragma vertex vert
#pragma fragment frag
#pragma fragmentoption ARB_precision_hint_fastest

ENDCG
}
}
}

CGINCLUDE ... ENDCG

SubShader {}

CGINCLUDE

#pragma vertex vert

#pragma fragment frag