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