103 lines
2.6 KiB
Plaintext
103 lines
2.6 KiB
Plaintext
Shader "Unlit/MirrorAlpha"
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{
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Properties
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{
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_MainTex("Texture", 2D) = "white" {}
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_MirrorU("水平镜像翻转",float) = 0
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_MirrorV("竖直镜像翻转",float) = 0
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_AlphaLX("RangeAlphaLX",float) = 0
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_AlphaRX("RangeAlphaRX",float) = 1
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_AlphaTY("RangeAlphaTY",float) = 1
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_AlphaBY("RangeAlphaBY",float) = 0
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_AlphaPower("Power",float) = 0 //透明度变化范围
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_AlphaStart("Start",float) = 0
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}
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SubShader
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{
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Tags {"RenderType" = "Transparent" "Queue" = "Transparent"}
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Blend SrcAlpha OneMinusSrcAlpha
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Pass
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{
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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sampler2D _MainTex;
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float _MirrorU;
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float _MirrorV;
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float _AlphaPower;
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sampler2D _AlphaTex;
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float _AlphaLX;
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float _AlphaRX;
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float _AlphaTY;
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float _AlphaBY;
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float _AlphaStart;
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struct a2v {
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float4 vertex : POSITION;
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float3 texcoord : TEXCOORD0;
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};
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struct v2f {
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float4 pos : SV_POSITION;
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float2 uv : TEXCOORD0;
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};
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v2f vert(a2v v) {
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v2f o;
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o.pos = UnityObjectToClipPos(v.vertex);
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o.uv = v.texcoord;
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if (_MirrorU > 0) {
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o.uv.x = 1 - o.uv.x;//Flip the coordinates to get the image sampling data
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}
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if (_MirrorV > 0) {
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o.uv.y = 1 - o.uv.y;//Flip the coordinates to get the image sampling data
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}
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return o;
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}
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//此方法取自Unity默认Sprite的Shader
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fixed4 SampleSpriteTexture(float2 uv)
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{
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fixed4 color = tex2D(_MainTex, uv);
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#if ETC1_EXTERNAL_ALPHA
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// get the color from an external texture (usecase: Alpha support for ETC1 on android)
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color.a = tex2D(_AlphaTex, uv).r;
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#endif //ETC1_EXTERNAL_ALPHA
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return color;
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}
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fixed4 frag(v2f i) : SV_Target{
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// sample the texture
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fixed4 col = SampleSpriteTexture(i.uv);
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//利用透明度阈值和uv坐标的差来计算透明的程度和是否控制其半透
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//四个方向只是对坐标的取值和正反方向不同，原理一致
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fixed alphalx = col.a * lerp(_AlphaStart, _AlphaPower, (_AlphaLX - i.uv.x));
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col.a = saturate(lerp(alphalx, col.a, step(_AlphaLX, i.uv.x)));
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fixed alpharx = col.a * lerp(_AlphaStart, _AlphaPower, (i.uv.x - _AlphaRX));
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col.a = saturate(lerp(col.a, alpharx, step(_AlphaRX, i.uv.x)));
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fixed alphaby = col.a * lerp(_AlphaStart, _AlphaPower, (_AlphaBY - i.uv.y));
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col.a = saturate(lerp(alphaby, col.a, step(_AlphaBY, i.uv.y)));
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fixed alphaty = col.a * lerp(_AlphaStart, _AlphaPower, (i.uv.y - _AlphaTY));
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col.a = saturate(lerp(col.a, alphaty, step(_AlphaTY, i.uv.y)));
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return col;
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//return tex2D(_MainTex,i.uv);
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}
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ENDCG
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}
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}
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FallBack off
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} |