235 lines
9.0 KiB
GLSL
235 lines
9.0 KiB
GLSL
Shader "Soullies/DTM_RandomGridTube"
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{
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Properties
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{
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[HDR]_Color0("Color0", Color) = (1, 1, 1, 0)
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[Header(Pattern Settings)]
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_PatternSize("Pattern Size (X, Y)", Vector) = (2.0, 2.0, 0, 0)
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_GridDensity("Grid Density (Quantity Multiplier)", Float) = 1.0
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_TimeAngle("Time Angle (Speed)", Float) = 1.0
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[Header(Edge Settings)]
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_StepA("Step A", Range(0, 1)) = 0.293
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_StepB("Step B", Range(0, 1)) = 0.345
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[Header(Seam Hiding)]
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_SeamRotation("Seam Angle Offset", Range(-180, 180)) = -90.0
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_SeamFadeWidth("Seam Cut Width", Range(0.0, 1.0)) = 0.2
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_SeamFadeSmoothness("Seam Softness", Range(0.0, 1.0)) = 1.0
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[Header(Tube Specific Settings)]
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_FadeFar("Fade Far (Fully Transparent)", Float) = 100.0
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_FadeNear("Fade Near (Fully Opaque)", Float) = 20.0
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_TubeRadius("Virtual Tube Radius", Float) = 10.0
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[Header(Render State)]
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[Enum(UnityEngine.Rendering.BlendMode)] _SrcBlend("Src Blend", Float) = 5 // SrcAlpha
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[Enum(UnityEngine.Rendering.BlendMode)] _DstBlend("Dst Blend", Float) = 10 // OneMinusSrcAlpha
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[Enum(Off, 0, On, 1)] _ZWrite("Z Write", Float) = 0
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[Enum(Front, 0, Back, 1, Off, 2)] _CullMode("Cull Mode", Float) = 1 // Front (Inside)
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}
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SubShader
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{
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Tags
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{
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"RenderPipeline" = "UniversalPipeline"
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"RenderType" = "Transparent"
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"Queue" = "Transparent-300"
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"UniversalMaterialType" = "Unlit"
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"IgnoreProjector" = "True"
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}
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Blend [_SrcBlend] [_DstBlend]
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ZWrite [_ZWrite]
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Cull [_CullMode] // Default Cull Front to see inside the tube
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Pass
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{
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Name "ForwardOnly"
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Tags { "LightMode" = "UniversalForwardOnly" }
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HLSLPROGRAM
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#pragma target 4.5
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#pragma prefer_hlslcc gles
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#pragma multi_compile_instancing
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#pragma multi_compile_fog
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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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float2 uv : TEXCOORD0;
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UNITY_VERTEX_INPUT_INSTANCE_ID
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};
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struct Varyings
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{
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float4 positionCS : SV_POSITION;
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float3 positionWS : TEXCOORD0;
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float3 positionOS : TEXCOORD1;
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half fogFactor : TEXCOORD3;
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UNITY_VERTEX_INPUT_INSTANCE_ID
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UNITY_VERTEX_OUTPUT_STEREO
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};
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CBUFFER_START(UnityPerMaterial)
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half4 _Color0;
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float4 _PatternSize;
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float _GridDensity;
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float _TimeAngle;
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float _StepA;
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float _StepB;
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float _SeamRotation;
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float _SeamFadeWidth;
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float _SeamFadeSmoothness;
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float _FadeFar;
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float _FadeNear;
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float _TubeRadius;
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CBUFFER_END
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// -------------------------------------
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// Custom Helper Functions
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float2 VoronoiHash(float2 p)
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{
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p = float2(dot(p, float2(127.1, 311.7)), dot(p, float2(269.5, 183.3)));
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return frac(sin(p) * 43758.5453);
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}
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// Manhattan-based Voronoi optimized for Mobile URP
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float VoronoiDistance(float2 v, float t)
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{
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float2 n = floor(v);
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float2 f = frac(v);
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float minDist = 8.0;
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UNITY_UNROLL
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for (int j = -1; j <= 1; j++)
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{
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UNITY_UNROLL
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for (int i = -1; i <= 1; i++)
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{
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float2 g = float2((float)i, (float)j);
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float2 o = VoronoiHash(n + g);
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// Oscillating movement
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o = sin(t + o * 6.2831853) * 0.5 + 0.5;
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float2 r = f - g - o;
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// Manhattan distance for rectangular frames
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float d = 0.5 * (abs(r.x) + abs(r.y));
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minDist = min(minDist, d);
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}
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}
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return minDist;
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}
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// -------------------------------------
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// Vertex Shader
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Varyings vert(Attributes input)
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{
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Varyings output = (Varyings)0;
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UNITY_SETUP_INSTANCE_ID(input);
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UNITY_TRANSFER_INSTANCE_ID(input, output);
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UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(output);
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VertexPositionInputs vertexInput = GetVertexPositionInputs(input.positionOS.xyz);
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output.positionCS = vertexInput.positionCS;
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output.positionWS = vertexInput.positionWS;
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output.positionOS = input.positionOS.xyz;
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output.fogFactor = ComputeFogFactor(vertexInput.positionCS.z);
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return output;
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}
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// -------------------------------------
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// Fragment Shader
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half4 frag(Varyings input) : SV_Target
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{
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UNITY_SETUP_INSTANCE_ID(input);
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UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
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// ==========================================
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// 1. Cylindrical Mapping & Seam Control
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// ==========================================
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// Calculate angle around the Z-axis in object space. atan2 returns [-PI, PI].
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float rawAngle = atan2(input.positionOS.y, input.positionOS.x);
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// Rotate the seam mechanically
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float angleOffset = _SeamRotation * (3.14159265 / 180.0);
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float angle = rawAngle + angleOffset;
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// Wrap angle to [-PI, PI] to keep math bounded
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if(angle > 3.14159265) angle -= 6.2831853;
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if(angle < -3.14159265) angle += 6.2831853;
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// Derive distance to the seam (seam is at absolute PI or -PI)
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float distToSeam = 3.14159265 - abs(angle);
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// Seam alpha fading calculation
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float endFade = _SeamFadeWidth * 3.14159265;
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float startFade = endFade * (1.0 - _SeamFadeSmoothness);
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float seamFadeMask = smoothstep(startFade, endFade + 0.0001, distToSeam);
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// Convert adjusted angle to U coordinate
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float u = angle * _TubeRadius;
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// V is driven by World Z to maintain seamless tiling
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float v = input.positionWS.z;
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float2 cylindricalUV = float2(u, v);
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// Density Multiplier
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float density = max(_GridDensity, 0.0001);
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float2 sizeDivisor = max(_PatternSize.xy, float2(0.0001, 0.0001)) / density;
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float2 scaledUV = cylindricalUV / sizeDivisor;
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// Rotate 45 degrees
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float c = 0.707106;
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float s = 0.707106;
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float2 rotatedUV = mul(scaledUV, float2x2(c, -s, s, c));
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// Time driven animation
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float t = _TimeAngle * _TimeParameters.x;
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// Voronoi mathematical noise
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float voronoiV = VoronoiDistance(rotatedUV, t);
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// Anti-aliased border mask computation
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float fw = fwidth(voronoiV);
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float edge1 = smoothstep(_StepA - fw, _StepA + fw, voronoiV);
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float edge2 = smoothstep(_StepB - fw, _StepB + fw, voronoiV);
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float gridAlphaMask = edge2 - edge1;
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half3 gridColor = _Color0.rgb;
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half gridAlpha = gridAlphaMask * _Color0.a;
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// ==========================================
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// 2. Distance Fade (Far = Transparent, Near = Opaque)
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// ==========================================
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float distToCam = distance(GetCameraPositionWS(), input.positionWS);
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// If distToCam is between _FadeFar and _FadeNear, smoothly transition
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// When dist = _FadeFar, fadeMask = 0 (Transparent)
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// When dist = _FadeNear, fadeMask = 1 (Opaque)
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float rawFade = (distToCam - _FadeFar) / (_FadeNear - _FadeFar + 0.0001);
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float fadeMask = saturate(rawFade);
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// Multiply the alpha by our camera distance fade AND seam smooth fade
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gridAlpha *= fadeMask * seamFadeMask;
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// Apply URP Fog
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gridColor = MixFog(gridColor, input.fogFactor);
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return half4(gridColor, gridAlpha);
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}
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ENDHLSL
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}
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}
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FallBack "Hidden/Universal Render Pipeline/FallbackError"
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}
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