96 lines
3.7 KiB
Plaintext
96 lines
3.7 KiB
Plaintext
Shader "Outline/Blur"
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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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}
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//https://github.com/mattdesl/lwjgl-basics/blob/master/test/mdesl/test/shadertut/ShaderLesson5.java
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SubShader
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{
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Cull Off ZWrite Off ZTest Always
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// Combined
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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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#include "UnityCG.cginc"
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struct appdata
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{
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float4 vertex : POSITION;
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float2 uv : 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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float2 uv : TEXCOORD0;
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UNITY_VERTEX_INPUT_INSTANCE_ID
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UNITY_VERTEX_OUTPUT_STEREO
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};
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UNITY_DECLARE_SCREENSPACE_TEXTURE(_MainTex);
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half4 _MainTex_ST;
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uniform float _BlurResolution;
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uniform float _BlurRadius;
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uniform float _BlurDirectionX;
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uniform float _BlurDirectionY;
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v2f vert (appdata v)
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{
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v2f o;
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UNITY_SETUP_INSTANCE_ID(v);
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UNITY_INITIALIZE_OUTPUT(v2f, o);
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UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
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o.vertex = UnityObjectToClipPos(v.vertex);
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o.uv = TRANSFORM_TEX(v.uv, _MainTex);
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return o;
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}
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fixed4 frag (v2f i) : SV_Target
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{
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//_BlurRadius = 2.5f;
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//our original texcoord for this fragment
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fixed2 tc = UnityStereoScreenSpaceUVAdjust(i.uv, _MainTex_ST);
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//float r = lerp(_BlurResolution.y, _BlurResolution.x, step(_BlurDirection.x, 1.0f));
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//the amount to blur, i.e. how far off center to sample from
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//1.0 -> blur by one pixel
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//2.0 -> blur by two pixels, etc.
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float blur = _BlurRadius/_BlurResolution;
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//the _BlurDirectionection of our blur
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//(1.0, 0.0) -> x-axis blur
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//(0.0, 1.0) -> y-axis blur
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float hstep = _BlurDirectionX;
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float vstep = _BlurDirectionY;
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//apply blurring, using a 9-tap filter with predefined gaussian weights
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fixed4 sum = UNITY_SAMPLE_SCREENSPACE_TEXTURE(_MainTex, fixed2(tc.x - 4.0*blur*hstep, tc.y - 4.0*blur*vstep)) * 0.0162162162;
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sum += UNITY_SAMPLE_SCREENSPACE_TEXTURE(_MainTex, fixed2(tc.x - 3.0*blur*hstep, tc.y - 3.0*blur*vstep)) * 0.0540540541;
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sum += UNITY_SAMPLE_SCREENSPACE_TEXTURE(_MainTex, fixed2(tc.x - 2.0*blur*hstep, tc.y - 2.0*blur*vstep)) * 0.1216216216;
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sum += UNITY_SAMPLE_SCREENSPACE_TEXTURE(_MainTex, fixed2(tc.x - 1.0*blur*hstep, tc.y - 1.0*blur*vstep)) * 0.1945945946;
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sum += UNITY_SAMPLE_SCREENSPACE_TEXTURE(_MainTex, fixed2(tc.x, tc.y)) * 0.2270270270;
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sum += UNITY_SAMPLE_SCREENSPACE_TEXTURE(_MainTex, fixed2(tc.x + 1.0*blur*hstep, tc.y + 1.0*blur*vstep)) * 0.1945945946;
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sum += UNITY_SAMPLE_SCREENSPACE_TEXTURE(_MainTex, fixed2(tc.x + 2.0*blur*hstep, tc.y + 2.0*blur*vstep)) * 0.1216216216;
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sum += UNITY_SAMPLE_SCREENSPACE_TEXTURE(_MainTex, fixed2(tc.x + 3.0*blur*hstep, tc.y + 3.0*blur*vstep)) * 0.0540540541;
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sum += UNITY_SAMPLE_SCREENSPACE_TEXTURE(_MainTex, fixed2(tc.x + 4.0*blur*hstep, tc.y + 4.0*blur*vstep)) * 0.0162162162;
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return sum;
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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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