249 lines
9.5 KiB
GLSL
249 lines
9.5 KiB
GLSL
// This shader draws a texture on the mesh.
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Shader "custom/tunnel"
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{
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// The _BaseMap variable is visible in the Material's Inspector, as a field
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// called Base Map.
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Properties
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{
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_BackgroundColor("Background Color", Color) = (0,0,0,0)
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[HDR] _NebulaColor1("Nebula Color 1", Color) = (1,1,1,1)
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[HDR] _NebulaColor2("Nebula Color 2", Color) = (1,1,1,1)
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[HDR] _FractalColor("Fractal Color", Color) = (1,1,1,1)
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_FractalWeight("Fractal Weight", Range(0.0,1.0)) = 1.0
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_NebulaWeight("Nebula Weight", Range(0.0,1.0)) = 1.0
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_BarsWeight("Bars Weight", Range(0.0,1.0)) = 1.0
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_StarsWeight("Stars Weight", Range(0.0,1.0)) = 1.0
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_FractalScale("Fractal Scale", Float) = 6.0
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_FractalRotateSpeed("Fractal Rotate Speed", Float) = 20.0
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_FractalPower("Fractal Power", Float) = 1.0
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_FractalInner("Fractal Inner", Float) = 0.2
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_Nebula1Power("Nebula 1 Power", Float) = 1.0
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_Nebula2Power("Nebula 2 Power", Float) = 1.0
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_NebulaMap("Nebula Map", 2D) = "black"
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_StarMap("Star Map", 2D) = "black"
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_FractalMap("Fractal Map", 2D) = "black"
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_ShakeStrength("Shake Strength", Float) = 0.01
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_Intensity("Intensity", Float) = 1.0
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}
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SubShader
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{
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Tags { "RenderType" = "Opaque" "RenderPipeline" = "UniversalRenderPipeline" }
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Pass
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{
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HLSLPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
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struct Attributes
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{
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float4 positionOS : POSITION;
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// The uv variable contains the UV coordinate on the texture for the
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// given vertex.
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float2 uv : TEXCOORD0;
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};
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struct Varyings
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{
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float4 positionHCS : SV_POSITION;
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// The uv variable contains the UV coordinate on the texture for the
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// given vertex.
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float2 uv : TEXCOORD0;
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};
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float4 _BackgroundColor;
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float4 _NebulaColor1;
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float4 _NebulaColor2;
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float4 _FractalColor;
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float _FractalScale = 6.0;
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float _FractalRotateSpeed = 20.0;
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float _FractalPower = 1.0;
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float _FractalInner = 0.2;
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float _FractalWeight = 1.0;
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float _Nebula1Power = 1.0;
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float _Nebula2Power = 1.0;
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float _NebulaWeight = 1.0;
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float _BarsWeight;
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float _StarsWeight;
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float _Intensity;
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float _ShakeStrength;
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TEXTURE2D(_NebulaMap);
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SAMPLER(sampler_NebulaMap);
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TEXTURE2D(_StarMap);
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SAMPLER(sampler_StarMap);
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TEXTURE2D(_FractalMap);
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SAMPLER(sampler_FractalMap);
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CBUFFER_START(UnityPerMaterial)
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// The following line declares the _BaseMap_ST variable, so that you
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// can use the _BaseMap variable in the fragment shader. The _ST
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// suffix is necessary for the tiling and offset function to work.
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float4 _NebulaMap_ST;
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float4 _StarMap_ST;
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float4 _FractalMap_ST;
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CBUFFER_END
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Varyings vert(Attributes IN)
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{
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Varyings OUT;
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OUT.positionHCS = TransformObjectToHClip(IN.positionOS.xyz);
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OUT.uv = IN.uv;
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return OUT;
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}
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float2 rotateUV(float2 uv, float rotation)
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{
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float mid = 0.5;
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return float2(
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cos(rotation) * (uv.x - mid) + sin(rotation) * (uv.y - mid) + mid,
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cos(rotation) * (uv.y - mid) - sin(rotation) * (uv.x - mid) + mid
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);
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}
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float4 nebula(float r, float a)
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{
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// sample nebula 1
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float n1_stretch = 1.0/50.0;
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float n1_speed = 20.0;
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float n1_spin = 10.0;
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// float n1_power = 2.0;
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float n1_cutoff = 0.5;
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float2 nuv1;
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nuv1.x = n1_stretch/(r*r) + _Time * n1_speed;
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nuv1.y = a/PI + _Time * n1_spin;
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half4 nebula1 = SAMPLE_TEXTURE2D(_NebulaMap, sampler_NebulaMap, nuv1);
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nebula1 *= _NebulaColor1;
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nebula1 *= max(0,_Nebula1Power*r-n1_cutoff);
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// sample nebula 2 - same as nebula 1 but in another direction
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float n2_stretch = 1.0/100.0;
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float n2_speed = 30.0;
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float n2_spin = -5.0;
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// float n2_power = 4.0;
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float n2_cutoff = 0.5;
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float2 nuv2;
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nuv2.x = n2_stretch/(r*r) + _Time * n2_speed;
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nuv2.y = a/PI + _Time * n2_spin;
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half4 nebula2 = SAMPLE_TEXTURE2D(_NebulaMap, sampler_NebulaMap, nuv2.yx);
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nebula2 *= _NebulaColor2;
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nebula2 *= max(0,_Nebula2Power*r - n2_cutoff);
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return (nebula1 + nebula2) * _Intensity * _NebulaWeight;
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}
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float4 stars(float r, float a)
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{
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// sample stars
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float starStretch = 1.0/100.0;
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float starSpeed = 10.0 * _Intensity;
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float starWrap = 3.5f;
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// star uv
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float2 suv;
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// use the root to make them into radial lines instead of a tunnel
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suv.x = starStretch/sqrt(r) + _Time * starSpeed;
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suv.y = (float)starWrap*a/PI;
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half4 star = SAMPLE_TEXTURE2D(_StarMap, sampler_StarMap, suv);
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star *= r * r * 2.0;
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return star * _Intensity * _StarsWeight;
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}
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// same as fractals but calling it from a function turns them into bars??
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float4 bars(float r, float p)
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{
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// fractal uv
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float2 fuv1 = p / _FractalScale + float2(0.5,0.5);
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fuv1 = rotateUV(fuv1,_Time*_FractalRotateSpeed);
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half4 fractal1 = SAMPLE_TEXTURE2D(_FractalMap, sampler_FractalMap, fuv1);
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fractal1 *= _FractalColor;
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fractal1 *= max(0, r-_FractalInner);
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fractal1 *= _FractalPower;
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// fractal 2
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float2 fuv2 = p / _FractalScale + float2(0.5,0.5);
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fuv2 = rotateUV(fuv2,-_Time*_FractalRotateSpeed*3.561);
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fuv2.x=1.0-fuv2.x;
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half4 fractal2 = SAMPLE_TEXTURE2D(_FractalMap, sampler_FractalMap, fuv2);
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fractal2 *= _FractalColor * sin(_Time*3);
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fractal2 *= max(0, r-_FractalInner);
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fractal2 *= _FractalPower;
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half4 fractal = max(fractal1,fractal2) * _Intensity;
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return fractal * _Intensity * _BarsWeight;
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}
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float4 frag(Varyings IN) : SV_Target
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{
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float2 res = _ScreenParams;
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float2 p = -1.0+2.0*IN.positionHCS.xy/res.xy;
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p.x *= res.x/res.y;
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float2 cameraShake;
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float shake = _Time*50;
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cameraShake.x = cos(shake*12.3341)+sin(shake*19.231057);
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cameraShake.y = cos(shake*17.12311)+sin(shake*14.2315165);
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cameraShake*=_ShakeStrength;
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// p += cameraShake;
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// shared tunnel vars
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float r = length(p);
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float a = atan(p.y/p.x);
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// for some reason trying to sample the fractal in a function turns it into bars
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// looks cool but no idea why it happens so these fractals are inline
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float2 fuv1 = p / _FractalScale + float2(0.5,0.5);
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fuv1 = rotateUV(fuv1,_Time*_FractalRotateSpeed);
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half4 fractal1 = SAMPLE_TEXTURE2D(_FractalMap, sampler_FractalMap, fuv1);
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fractal1 *= _FractalColor;
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fractal1 *= max(0, r-_FractalInner);
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fractal1 *= _FractalWeight;
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fractal1 *= _Intensity;
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float2 fuv2 = p / _FractalScale + float2(0.5,0.5);
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fuv2 = rotateUV(fuv2,-_Time*_FractalRotateSpeed*3.561);
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fuv2.x=1.0-fuv2.x;
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half4 fractal2 = SAMPLE_TEXTURE2D(_FractalMap, sampler_FractalMap, fuv2);
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fractal2 *= _FractalColor * sin(_Time*3);
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fractal2 *= max(0, r-_FractalInner);
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fractal2 *= _FractalWeight;
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fractal2 *= _Intensity;
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float4 color = _BackgroundColor;
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color += nebula(r, a);
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color += bars(r, p);
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color += fractal1;
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color += fractal2;
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color += stars(r, a);
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// bars, nebula, fractal,
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// average across all fx
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color = saturate(color);
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return color;
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}
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ENDHLSL
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}
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}
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}
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