118 lines
3.8 KiB
Plaintext
118 lines
3.8 KiB
Plaintext
// Unity built-in shader source. Copyright (c) 2016 Unity Technologies. MIT license (see license.txt)
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Shader "UI/AlwaysOnTop"
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{
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Properties
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{
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[PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}
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_Color ("Tint", Color) = (1,1,1,1)
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[Toggle(UNITY_UI_ALPHACLIP)] _UseUIAlphaClip ("Use Alpha Clip", Float) = 0
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}
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SubShader
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{
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Tags
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{
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"Queue"="Transparent"
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"IgnoreProjector"="True"
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"RenderType"="Transparent"
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"PreviewType"="Plane"
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"CanUseSpriteAtlas"="True"
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}
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Cull Off
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Lighting Off
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ZWrite Off
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ZTest Off // was [unity_GUIZTestMode]
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Blend One OneMinusSrcAlpha
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Pass
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{
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Name "Default"
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#pragma target 2.0
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#include "UnityCG.cginc"
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#include "UnityUI.cginc"
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#pragma multi_compile_local _ UNITY_UI_CLIP_RECT
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#pragma multi_compile_local _ UNITY_UI_ALPHACLIP
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struct appdata_t
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{
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float4 vertex : POSITION;
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float4 color : COLOR;
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float2 texcoord : TEXCOORD0;
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UNITY_VERTEX_INPUT_INSTANCE_ID
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};
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struct v2f
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{
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float4 vertex : SV_POSITION;
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fixed4 color : COLOR;
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float2 texcoord : TEXCOORD0;
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float4 worldPosition : TEXCOORD1;
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float4 mask : TEXCOORD2;
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UNITY_VERTEX_OUTPUT_STEREO
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};
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sampler2D _MainTex;
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fixed4 _Color;
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fixed4 _TextureSampleAdd;
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float4 _ClipRect;
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float4 _MainTex_ST;
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float _UIMaskSoftnessX;
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float _UIMaskSoftnessY;
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v2f vert(appdata_t v)
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{
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v2f OUT;
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UNITY_SETUP_INSTANCE_ID(v);
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UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);
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float4 vPosition = UnityObjectToClipPos(v.vertex);
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OUT.worldPosition = v.vertex;
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OUT.vertex = vPosition;
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float2 pixelSize = vPosition.w;
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pixelSize /= float2(1, 1) * abs(mul((float2x2)UNITY_MATRIX_P, _ScreenParams.xy));
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float4 clampedRect = clamp(_ClipRect, -2e10, 2e10);
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float2 maskUV = (v.vertex.xy - clampedRect.xy) / (clampedRect.zw - clampedRect.xy);
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OUT.texcoord = TRANSFORM_TEX(v.texcoord.xy, _MainTex);
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OUT.mask = float4(v.vertex.xy * 2 - clampedRect.xy - clampedRect.zw, 0.25 / (0.25 * half2(_UIMaskSoftnessX, _UIMaskSoftnessY) + abs(pixelSize.xy)));
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OUT.color = v.color * _Color;
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return OUT;
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}
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fixed4 frag(v2f IN) : SV_Target
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{
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//Round up the alpha color coming from the interpolator (to 1.0/256.0 steps)
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//The incoming alpha could have numerical instability, which makes it very sensible to
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//HDR color transparency blend, when it blends with the world's texture.
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const half alphaPrecision = half(0xff);
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const half invAlphaPrecision = half(1.0/alphaPrecision);
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IN.color.a = round(IN.color.a * alphaPrecision)*invAlphaPrecision;
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half4 color = IN.color * (tex2D(_MainTex, IN.texcoord) + _TextureSampleAdd);
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#ifdef UNITY_UI_CLIP_RECT
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half2 m = saturate((_ClipRect.zw - _ClipRect.xy - abs(IN.mask.xy)) * IN.mask.zw);
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color.a *= m.x * m.y;
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#endif
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#ifdef UNITY_UI_ALPHACLIP
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clip (color.a - 0.001);
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#endif
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color.rgb *= color.a;
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return color;
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}
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ENDCG
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}
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}
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}
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