builtin_shaders-5.3.4f1学习-Sprites-Default

Shader "Sprites/Default"

{

	Properties

	{

		[PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}

		_Color ("Tint", Color) = (1,1,1,1)

		[MaterialToggle] PixelSnap ("Pixel snap", Float) = 0

	}

	SubShader

	{

		Tags

		{

			"Queue"="Transparent"

			"IgnoreProjector"="True"

			"RenderType"="Transparent"

			"PreviewType"="Plane"

			"CanUseSpriteAtlas"="True"

		}

		Cull Off         //关闭背面剔除

		Lighting Off     //关闭灯光

		ZWrite Off       //关闭Z缓冲

		Blend One OneMinusSrcAlpha     //混合源系数one(1)  目标系数OneMinusSrcAlpha(1-one=0)

		Pass

		{

		CGPROGRAM

			#pragma vertex vert

			#pragma fragment frag

			#pragma multi_compile _ PIXELSNAP_ON       //告诉Unity编译不同版本的Shader,这里和后面vert中的PIXELSNAP_ON对应

			#pragma shader_feature ETC1_EXTERNAL_ALPHA

			#include "UnityCG.cginc"

			struct appdata_t                           //vert输入

			{

				float4 vertex   : POSITION;

				float4 color    : COLOR;

				float2 texcoord : TEXCOORD0;

			};

			struct v2f                                 //vert输出数据结构

			{

				float4 vertex   : SV_POSITION;

				fixed4 color    : COLOR;

				float2 texcoord  : TEXCOORD0;

			};

			fixed4 _Color;

			v2f vert(appdata_t IN)

			{

				v2f OUT;

				OUT.vertex = mul(UNITY_MATRIX_MVP, IN.vertex);

				OUT.texcoord = IN.texcoord;

				OUT.color = IN.color * _Color;

				#ifdef PIXELSNAP_ON

				OUT.vertex = UnityPixelSnap (OUT.vertex);

				#endif

				return OUT;

			}

			sampler2D _MainTex;

			sampler2D _AlphaTex;

			fixed4 SampleSpriteTexture (float2 uv)

			{

				fixed4 color = tex2D (_MainTex, uv);

#if ETC1_EXTERNAL_ALPHA         //etc1没有透明通道，从另一图中取a值

				// get the color from an external texture (usecase: Alpha support for ETC1 on android)

				color.a = tex2D (_AlphaTex, uv).r;

#endif //ETC1_EXTERNAL_ALPHA

				return color;

			}

			fixed4 frag(v2f IN) : SV_Target

			{

				fixed4 c = SampleSpriteTexture (IN.texcoord) * IN.color;

				c.rgb *= c.a;

				return c;

			}

		ENDCG

		}

	}

}
巴特西

builtin_shaders-5.3.4f1学习-Sprites-Default

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