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- Shader "Custom/VignetteShader"
- {
- Properties
- {
- _MainTex ("Texture", 2D) = "white" {}
- _OFOV ("Outer Radius", Range(0.0, 1.0)) = 0.7
- _IFOV ("Inner Radius", Range(0.0, 1.0)) = 0.3
- _THRES_LR ("Threshold L/R overlap", Range(0.0, 1.0)) = 0.2
- //linearly decrease transparency from _IFOV to _OFOV; see Fernandes & Feiner (2016)
- [MaterialToggle] _Smooth ("Smooth", Float) = 0 //alternatively use hermite function
- }
- SubShader
- {
- // No culling or depth
- Cull Off ZWrite Off ZTest Always
- Pass
- {
- CGPROGRAM
- #pragma vertex vert
- #pragma fragment frag
- #pragma multi_compile_instancing
- #include "UnityCG.cginc"
- struct appdata
- {
- float4 vertex : POSITION;
- float2 uv : TEXCOORD0;
- UNITY_VERTEX_INPUT_INSTANCE_ID
- };
- struct v2f
- {
- float2 uv : TEXCOORD0;
- float4 vertex : SV_POSITION;
- UNITY_VERTEX_OUTPUT_STEREO
- };
- v2f vert(appdata v)
- {
- v2f o;
- UNITY_SETUP_INSTANCE_ID(v);
- UNITY_INITIALIZE_OUTPUT(v2f, o); //Insert
- UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o); //Insert
- o.vertex = UnityObjectToClipPos(v.vertex);
- o.uv = v.uv;
- return o;
- }
- //sampler2D _MainTex;
- UNITY_DECLARE_SCREENSPACE_TEXTURE(_MainTex); //Insert
- float _IFOV;
- float _OFOV;
- float _THRES_LR;
- float _Smooth;
- fixed4 frag(v2f i) : SV_Target
- {
- UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(i); //Insert
- fixed4 col = UNITY_SAMPLE_SCREENSPACE_TEXTURE(_MainTex, i.uv); //Insert
- float2 center = float2(0.5, 0.5);
- float distFromCenter = distance(i.uv.xy, center);
- float2 distFromCenter2 = i.uv.xy - center;
- float rest = 1 - _IFOV;
- //float distFromInnerRadius = -1 * (distFromCenter - _IFOV) / rest + 1;
- if (unity_StereoEyeIndex == 0) // left eye
- {
- if (distFromCenter2[0] >= 0) //right of center
- {
- if(abs(distFromCenter2[0]) < _THRES_LR)
- {
- distFromCenter = abs(distFromCenter2[1]);
- }else
- {
- center = center + float2(_THRES_LR,0);
- distFromCenter = distance(i.uv.xy, center);
- }
-
- //return 1 - col;
- }
- }
- else if (unity_StereoEyeIndex == 1) // right eye
- {
- if (distFromCenter2[0] <= 0) //left of center
- {
- if( abs(distFromCenter2[0]) < _THRES_LR)
- {
- distFromCenter = abs(distFromCenter2[1]);
- }else
- {
- center = center - float2(_THRES_LR,0);
- distFromCenter = distance(i.uv.xy, center);
- }
- //return 1 - col;
- }
- }
- float vignette;
- if (distFromCenter < _IFOV)
- {
- vignette = 1;
- }
- else if (distFromCenter > _OFOV)
- {
- vignette = 0;
- }
- else
- {
- vignette = -(distFromCenter - _IFOV) / (_OFOV - _IFOV) + 1;
- }
- col = saturate(col * vignette);
- return col;
- }
- ENDCG
- }
- }
- }
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