增加主界面特效

2026-07-04 16:26:44 +08:00
parent cf02cfd587
commit c14814bd3d
6 changed files with 263 additions and 367 deletions
@@ -0,0 +1,191 @@
+Shader "IndianOcean/WaterReflection"
+{
+    // 水面倒影 Shader
+    // 上方 (1-R) 正常显示原图，下方 R 区域为原图整体垂直翻转 + 扰动 + 淡出，
+    // 分界线处绘制一条水面亮线。
+
+    Properties
+    {
+        _MainTex        ("主贴图", 2D) = "white" {}
+        _Waterline      ("水面线位置（UV.y）", Range(0.05, 0.95)) = 0.7
+        _DistortStrength("水平扰动强度", Range(0, 0.08)) = 0.015
+        _DistortSpeed   ("扰动速度", Range(0, 5)) = 1.5
+        _DistortFreq    ("扰动频率", Range(1, 20)) = 8.0
+        _ReflDarken     ("倒影变暗系数", Range(0, 1)) = 0.5
+        _ReflFadeLen    ("倒影向下淡出长度", Range(0, 0.5)) = 0.25
+        _LineBrightness ("水面线亮度", Range(0, 3)) = 1.5
+        _LineThickness  ("水面线粗细", Range(0, 0.02)) = 0.004
+        _WaveAmplitude  ("水面线波浪振幅", Range(0, 0.05)) = 0.012
+        _WaveFreq       ("水面线波浪频率", Range(1, 15)) = 4.0
+        _WaveSpeed      ("水面线波浪速度", Range(0, 5)) = 1.0
+    }
+
+    SubShader
+    {
+        Tags
+        {
+            "RenderType" = "Transparent"
+            "Queue" = "Transparent"
+            "RenderPipeline" = "UniversalPipeline"
+        }
+        Blend SrcAlpha OneMinusSrcAlpha
+        ZWrite Off
+        Cull Off
+
+        Pass
+        {
+            Name "WaterReflection"
+            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;
+                float4 color    : COLOR;
+                UNITY_VERTEX_INPUT_INSTANCE_ID
+            };
+
+            struct Varyings
+            {
+                float4 positionCS : SV_POSITION;
+                float2 uv : TEXCOORD0;
+                float4 color : COLOR;
+                UNITY_VERTEX_INPUT_INSTANCE_ID
+            };
+
+            CBUFFER_START(UnityPerMaterial)
+                float4 _MainTex_ST;
+                float  _Waterline;
+                float  _DistortStrength;
+                float  _DistortSpeed;
+                float  _DistortFreq;
+                float  _ReflDarken;
+                float  _ReflFadeLen;
+                float  _LineBrightness;
+                float  _LineThickness;
+                float  _WaveAmplitude;
+                float  _WaveFreq;
+                float  _WaveSpeed;
+            CBUFFER_END
+
+            TEXTURE2D(_MainTex);
+            SAMPLER(sampler_MainTex);
+
+            /* ---------- noise ---------- */
+            float hash(float n)
+            {
+                return frac(sin(n) * 43758.5453);
+            }
+
+            float noise1D(float x)
+            {
+                float i = floor(x);
+                float f = frac(x);
+                f = f * f * (3.0 - 2.0 * f);
+                return lerp(hash(i), hash(i + 1.0), f);
+            }
+
+            // 多层叠加 → 类随机水面波纹，返回 [-1, 1]
+            float waterNoise(float x, float t)
+            {
+                float n = 0.0;
+                n += noise1D(x * _DistortFreq       + t * _DistortSpeed)       * 0.50;
+                n += noise1D(x * _DistortFreq * 2.3  - t * _DistortSpeed * 1.7) * 0.25;
+                n += noise1D(x * _DistortFreq * 4.7  + t * _DistortSpeed * 0.8) * 0.125;
+                return n * 2.0 - 1.0;
+            }
+
+            // 计算某 uv.x 处的局部水面线 Y 坐标（波浪起伏）
+            // 多层正弦叠加 + noise，产生自然的不规则波形
+            float localWaterline(float x, float t)
+            {
+                float wave = 0.0;
+                wave += sin(x * _WaveFreq * 6.2832 + t * _WaveSpeed)            * 0.50;
+                wave += sin(x * _WaveFreq * 6.2832 * 2.3 - t * _WaveSpeed * 1.4) * 0.25;
+                wave += sin(x * _WaveFreq * 6.2832 * 4.1 + t * _WaveSpeed * 0.7) * 0.15;
+                wave += noise1D(x * _WaveFreq * 3.0 + t * _WaveSpeed * 0.5)      * 0.10;
+                return _Waterline + wave * _WaveAmplitude;
+            }
+
+            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 = TRANSFORM_TEX(input.uv, _MainTex);
+                output.color = input.color;
+                return output;
+            }
+
+            half4 frag(Varyings input) : SV_Target
+            {
+                float2 uv   = input.uv;
+                float  time = _Time.y;
+
+                // ========== 1. 原图采样（上方区域直接使用） ==========
+                half4 baseColor = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, uv);
+
+                // ========== 2. 局部水面线（波浪起伏） ==========
+                float wl = localWaterline(uv.x, time);
+
+                // ========== 3. 判断是否在倒影区 ==========
+                float inRefl = 1.0 - step(wl, uv.y);
+
+                // ========== 4. 倒影 UV：整体垂直翻转 ==========
+                float2 reflUV = uv;
+                reflUV.y = 2.0 * wl - uv.y; // 以局部水面线为轴镜像
+
+                // 水平扰动
+                float distort = waterNoise(uv.x, time) * _DistortStrength;
+                // 越远离水面线（越往下）扰动越大
+                float depthRatio = 1.0 - uv.y / wl; // 0=水面, 1=最底
+                depthRatio = clamp(depthRatio, 0.0, 1.0);
+                distort *= (0.3 + 0.7 * depthRatio);
+                reflUV.x += distort;
+
+                // 夹紧，防止越界
+                reflUV = clamp(reflUV, 0.0, 1.0);
+
+                half4 reflColor = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, reflUV);
+
+                // ========== 5. 倒影衰减 ==========
+                // 5a. 整体变暗
+                reflColor.rgb *= (1.0 - _ReflDarken);
+
+                // 5b. 从水面线往下逐渐淡出（消散）
+                float fadeStart = wl - _ReflFadeLen;
+                float fadeFactor = smoothstep(fadeStart, wl, uv.y);
+                reflColor.a *= fadeFactor;
+
+                // ========== 6. 水面亮线（沿波浪曲线绘制） ==========
+                float distToLine = abs(uv.y - wl);
+                float lineFactor = 1.0 - smoothstep(0.0, _LineThickness, distToLine);
+
+                // ========== 7. 合成 ==========
+                half3 finalRGB = baseColor.rgb;
+
+                // 倒影区：用倒影色替换
+                finalRGB = lerp(finalRGB, reflColor.rgb, inRefl);
+
+                // 水面线：叠加高亮
+                finalRGB += lineFactor * _LineBrightness * half3(0.7, 0.85, 1.0);
+
+                float finalA = baseColor.a;
+                // 倒影区 alpha 也跟随淡出
+                finalA = lerp(finalA, reflColor.a, inRefl);
+
+                half4 finalColor = half4(finalRGB, finalA);
+                finalColor *= input.color;
+                return finalColor;
+            }
+            ENDHLSL
+        }
+    }
+    FallBack Off
+}