107 lines
3.7 KiB
Plaintext
107 lines
3.7 KiB
Plaintext
Shader "IndianOcean/DarknessOverlay"
|
||
{
|
||
// 黑暗遮罩 Shader v2 —— 乘法混合版（纯黑暗 + 光源，不含回声）
|
||
// 回声描边已独立到 SpriteEchoOutline shader，由 EchoSystem 全局参数驱动。
|
||
//
|
||
// 乘法混合：finalColor = srcColor * dstColor
|
||
// 黑暗区域：sceneColor * 0 = 纯黑（精灵完全看不见）
|
||
// 光照区域：sceneColor * 1 = 原色（完全可见）
|
||
Properties
|
||
{
|
||
_DarknessColor ("黑暗底色（夜间微光色调）", Color) = (0.01, 0.01, 0.02, 1)
|
||
_MinBrightness ("最小亮度（0=纯黑不可见, 0.05=微光）", Range(0, 0.3)) = 0.0
|
||
_LightSoftness ("光线柔和度（边缘渐变宽度）", Range(0.01, 1.0)) = 0.35
|
||
}
|
||
SubShader
|
||
{
|
||
Tags
|
||
{
|
||
"RenderType" = "Transparent"
|
||
"Queue" = "Transparent+100"
|
||
"RenderPipeline" = "UniversalPipeline"
|
||
}
|
||
Blend DstColor Zero
|
||
ZWrite Off
|
||
ZTest Always
|
||
Cull Off
|
||
|
||
Pass
|
||
{
|
||
Name "DarknessOverlay"
|
||
HLSLPROGRAM
|
||
#pragma vertex vert
|
||
#pragma fragment frag
|
||
#pragma multi_compile_instancing
|
||
|
||
#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;
|
||
float2 uv : TEXCOORD0;
|
||
float3 worldPos : TEXCOORD1;
|
||
UNITY_VERTEX_INPUT_INSTANCE_ID
|
||
};
|
||
|
||
CBUFFER_START(UnityPerMaterial)
|
||
float4 _DarknessColor;
|
||
float _MinBrightness;
|
||
float _LightSoftness;
|
||
CBUFFER_END
|
||
|
||
// 光源数据数组：xy = 世界坐标 XZ, z = 半径, w = 强度(0~1)
|
||
float4 _LightData[64];
|
||
int _LightCount;
|
||
|
||
Varyings vert(Attributes input)
|
||
{
|
||
Varyings output;
|
||
UNITY_SETUP_INSTANCE_ID(input);
|
||
UNITY_TRANSFER_INSTANCE_ID(input, output);
|
||
|
||
output.positionCS = TransformObjectToHClip(input.positionOS.xyz);
|
||
output.uv = input.uv;
|
||
output.worldPos = TransformObjectToWorld(input.positionOS.xyz);
|
||
return output;
|
||
}
|
||
|
||
half4 frag(Varyings input) : SV_Target
|
||
{
|
||
// 2.5D 俯视角：用世界坐标的 XZ 平面计算距离
|
||
float2 worldPos = input.worldPos.xz;
|
||
float lightAmount = 0.0;
|
||
|
||
// 常规光源
|
||
for (int i = 0; i < _LightCount; i++)
|
||
{
|
||
float2 lightPos = _LightData[i].xy;
|
||
float radius = _LightData[i].z;
|
||
float intensity= _LightData[i].w;
|
||
|
||
float dist = distance(worldPos, lightPos);
|
||
float innerRadius = radius * (1.0 - _LightSoftness);
|
||
float light = 1.0 - smoothstep(innerRadius, radius, dist);
|
||
light *= intensity;
|
||
lightAmount = max(lightAmount, light);
|
||
}
|
||
|
||
// 最小亮度：全黑区域是否允许微微看到东西
|
||
lightAmount = max(lightAmount, _MinBrightness);
|
||
|
||
// 从黑暗底色插值到白色
|
||
float3 maskColor = lerp(_DarknessColor.rgb, float3(1.0, 1.0, 1.0), lightAmount);
|
||
return half4(maskColor, 1.0);
|
||
}
|
||
ENDHLSL
|
||
}
|
||
}
|
||
FallBack Off
|
||
}
|