94 lines
3.2 KiB
Plaintext
94 lines
3.2 KiB
Plaintext
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// <copyright file="InsideShader.cs" company="Google Inc.">
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// Copyright (C) 2016 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// </copyright>
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//
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// This shader switches the culling to the front side and inverts the normal so
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// textures are drawn on the inside or back of the object.
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//
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Shader "GoogleVR/Demos/VideoDemo InsideShader" {
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Properties {
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_Gamma ("Video gamma", Range(0.01,3.0)) = 1.0
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_MainTex ("Base (RGB)", 2D) = "white" {}
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_StereoVideo ("Render Stereo Video", Int) = 1
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}
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SubShader {
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Pass {
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Tags { "RenderType" = "Opaque" }
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// cull the outside, since we want to draw on the inside of the mesh.
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Cull Front
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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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#include "../../../Shaders/GvrUnityCompatibility.cginc"
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float4 _MainTex_ST;
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sampler2D _MainTex;
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int _StereoVideo;
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float _Gamma;
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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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float3 gammaCorrect(float3 v)
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{
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return pow(v, 1.0/_Gamma);
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}
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float3 gammaCorrectApprox(float3 v)
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{
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return rsqrt(v);
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}
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// Apply the gamma correction. One possible optimization that could
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// be applied is if _Gamma == 2.0, then use gammaCorrectApprox since sqrt will be faster.
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// Also, if _Gamma == 1.0, then there is no effect, so this call could be skipped all together.
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float4 gammaCorrect(float4 v)
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{
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return float4( gammaCorrect(v.xyz), v.w );
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}
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v2f vert (appdata_base v) {
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v2f o;
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// invert the normal of the vertex
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v.normal.xyz = v.normal * -1;
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o.pos = GvrUnityObjectToClipPos(v.vertex);
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o.uv = TRANSFORM_TEX (v.texcoord, _MainTex);
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if (_StereoVideo > 0) {
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o.uv.y *= 0.5f;
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if(unity_StereoEyeIndex == 0) {
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o.uv.y += 0.5f;
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}
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}
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o.uv.x = 1 - o.uv.x;
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return o;
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}
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fixed4 frag (v2f i) : SV_Target {
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return gammaCorrect(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 "Mobile/VertextLit"
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}
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