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81 lines
2.4 KiB
81 lines
2.4 KiB
/************************************************************************************
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Copyright (c) Facebook Technologies, LLC and its affiliates. All rights reserved.
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See SampleFramework license.txt for license terms. Unless required by applicable law
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or agreed to in writing, the sample code is provided “AS IS” WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied. See the license for specific
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language governing permissions and limitations under the license.
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************************************************************************************/
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Shader "Oculus Sample/Procedural Gradient Skybox"
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{
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Properties
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{
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_TopColor ("Top Color", Color) = (1, 1, 1, 0)
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_HorizonColor ("Horizon Color", Color) = (1, 1, 1, 0)
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_BottomColor ("Bottom Color", Color) = (1, 1, 1, 0)
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_TopExponent ("Top Exponent", Float) = 0.5
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_BottomExponent ("Bottom Exponent", Float) = 0.5
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_AmplFactor ("Amplification", Float) = 1.0
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}
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SubShader
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{
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Tags{"RenderType" ="Background" "Queue" = "Background"}
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ZWrite Off Cull Off
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Fog { Mode Off }
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LOD 100
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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 vertIn
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{
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float4 vertex : POSITION;
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float3 uv : TEXCOORD0;
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};
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struct vertOut
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{
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float4 vertex : SV_POSITION;
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float3 uv: TEXCOORD0;
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};
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vertOut vert (vertIn v)
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{
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vertOut o;
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o.vertex = UnityObjectToClipPos(v.vertex);
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o.uv = v.uv;
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return o;
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}
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half _TopExponent;
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half _BottomExponent;
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fixed4 _TopColor;
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fixed4 _HorizonColor;
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fixed4 _BottomColor;
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half _AmplFactor;
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fixed4 frag (vertOut i) : SV_Target
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{
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float interpUv = normalize (i.uv).y;
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// top goes from 0->1 going down toward horizon
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float topLerp = 1.0f - pow (min (1.0f, 1.0f - interpUv), _TopExponent);
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// bottom goes from 0->1 going up toward horizon
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float bottomLerp = 1.0f - pow (min (1.0f, 1.0f + interpUv), _BottomExponent);
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// last lerp param is horizon. all must add up to 1.0
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float horizonLerp = 1.0f - topLerp - bottomLerp;
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return (_TopColor * topLerp + _HorizonColor * horizonLerp + _BottomColor * bottomLerp) *
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_AmplFactor;
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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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