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79 lines
1.7 KiB
79 lines
1.7 KiB
//======= Copyright (c) Valve Corporation, All rights reserved. ===============
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// UNITY_SHADER_NO_UPGRADE
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Shader "Custom/SteamVR_SphericalProjection" {
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Properties {
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_MainTex ("Base (RGB)", 2D) = "white" {}
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_N ("N (normal of plane)", Vector) = (0,0,0,0)
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_Phi0 ("Phi0", Float) = 0
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_Phi1 ("Phi1", Float) = 1
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_Theta0 ("Theta0", Float) = 0
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_Theta1 ("Theta1", Float) = 1
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_UAxis ("uAxis", Vector) = (0,0,0,0)
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_VAxis ("vAxis", Vector) = (0,0,0,0)
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_UOrigin ("uOrigin", Vector) = (0,0,0,0)
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_VOrigin ("vOrigin", Vector) = (0,0,0,0)
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_UScale ("uScale", Float) = 1
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_VScale ("vScale", Float) = 1
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}
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CGINCLUDE
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#include "UnityCG.cginc"
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sampler2D _MainTex;
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float4 _N;
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float _Phi0, _Phi1, _Theta0, _Theta1;
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float4 _UAxis, _VAxis;
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float4 _UOrigin, _VOrigin;
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float _UScale, _VScale;
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struct v2f {
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float4 pos : SV_POSITION;
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float2 tex : TEXCOORD0;
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};
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v2f vert(appdata_base v) {
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v2f o;
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#if UNITY_VERSION >= 540
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o.pos = UnityObjectToClipPos(v.vertex);
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#else
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o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
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#endif
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o.tex = float2(
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lerp(_Phi0, _Phi1, v.texcoord.x),
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lerp(_Theta0, _Theta1, v.texcoord.y));
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return o;
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}
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float3 cartesian(float phi, float theta)
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{
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float sinTheta = sin(theta);
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return float3(
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sinTheta * sin(phi),
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cos(theta),
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sinTheta * cos(phi));
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}
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float4 frag(v2f i) : COLOR {
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float3 V = cartesian(i.tex.x, i.tex.y);
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float3 P = V / dot(V, _N.xyz); // intersection point on plane
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float2 uv = float2(
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dot(P - _UOrigin.xyz, _UAxis.xyz) * _UScale,
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dot(P - _VOrigin.xyz, _VAxis.xyz) * _VScale);
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return tex2D(_MainTex, uv);
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}
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ENDCG
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SubShader {
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Pass {
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ZTest Always Cull Off ZWrite Off
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Fog { Mode Off }
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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ENDCG
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}
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}
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}
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