Wuthering Waves Shader Update

- Implemented the Aurora shader feature. This effect was first seen on shorekeeper. Co-Authored-By: Manashiku <[email protected]>
Hoyotoon · Jan 1, 2025 · 9b37e8b · 9b37e8b
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diff --git a/Shaders/Wuthering Waves/HoyoToonWutheringWaves.shader b/Shaders/Wuthering Waves/HoyoToonWutheringWaves.shader
@@ -242,6 +242,28 @@ Shader "HoyoToon/Wuthering Waves/Character"
                 [HideInInspector] end_soundwave ("", Float) = 0
 
             [HideInInspector] end_tacet ("", Float) = 0
+
+            [HideInInspector] start_uvwave("Star Aurora", Float) = 0
+                [Toggle] _UseStarrySky ("Enable Star Aurora", Float) = 0
+                _AuroraAmount ("Aurora Amount", Float) = 3.0
+                [HideInInspector] start_secondrgb ("Secondary Diffuse", float) = 0
+                    _Second_RGB ("Secondary Diffuse", 2D) = "white" {}
+                    _Second_NoiseStrength ("Secondary Noise Strength", Float) = 0.15
+                    _Second_Height ("Secondary Height", Float) = -0.4
+                    _Second_HeightRadio ("Secondary Height Ratio", Float) = 0.6
+                [HideInInspector] end_secondrgb ("", float) = 0
+                [HideInInspector] start_starrynoise ("Noise", Float) = 0
+                    [Toggle] _UseNoise ("Enable Noise", Float) = 0
+                    _CommonNoiseMap ("Common Noise Map", 2D) = "white" {}
+                [HideInInspector] end_starrynoise ("", Float) = 0
+                [HideInInspector] start_wave ("Wave", Float) = 0
+                    _WaveAmount ("Wave Amount", Float) = 0.8
+                    _WaveNormalAmount ("Wave Normal Amount", Float) = 1.2
+                    _WaveSpeed  ("Wave Speed", Float) = 0.3
+                    _WaveTiling ("Wave Tiling", Float) = 5.5
+                [HideInInspector] end_wave ("", Float) = 0
+
+            [HideInInspector] end_uvwave("", Float) = 0
         [HideInInspector] end_special ("", Float) = 0
 
         [HideInInspector] start_renderingOptions("Rendering Options", Float) = 0

diff --git a/Shaders/Wuthering Waves/Include/HoyoToonWutheringWaves-common.hlsl b/Shaders/Wuthering Waves/Include/HoyoToonWutheringWaves-common.hlsl
@@ -783,4 +783,32 @@ void material_tacet(inout float3 color, in float2 uv)
     clip((1-mark) - 0.01f);
 
     color.xyz = lerp(_SDFColor, color.xyz, mark);
+}
+
+void aurora_wave(in float2 uv, in float3 pos, in float3 normal, in float3 tangent, in float3 view, in float4 spos, inout float3 color)
+{
+    // get screenspace uvs
+    float2 ssuv = spos.xy/spos.ww;
+    ssuv = ssuv * _Second_Height;
+    // sample noise texture
+    float noise = _CommonNoiseMap.Sample(sampler_linear_repeat, uv + (_Time.yy * float2(0.f, 0.1f))).y * _Second_NoiseStrength ;
+    // sample stars and mask
+    float4 secondary = _Second_RGB.Sample(sampler_linear_repeat, ssuv * (noise * 2.0 - 1.0f));
+    float mask = _Second_RGB.Sample(sampler_linear_repeat, uv).w;
+
+    // Calculate the aurora effect using UVs and normals
+    float aurora = sin((uv.y) * (5.0f * _WaveTiling) + (_Time.y * (_WaveSpeed * 10.0f))) * 0.5 + 0.5 ;
+    float auroraFactor = sin(normal.y * normal.z) * -_WaveNormalAmount;
+    aurora = aurora + auroraFactor;
+    // modify the aurora 
+    aurora = max(aurora, 0.0f);
+    aurora = pow(aurora, 1.0f);
+    aurora = smoothstep(0.5f, 1.0f, aurora);
+
+    // calculate color
+    float3 auroraColor = secondary + pow(color, 1.2f);
+    auroraColor = auroraColor * (aurora * _AuroraAmount);
+
+    // mask and add the auroraColor to the output color
+    color.xyz =  auroraColor * mask + color;
 }
diff --git a/Shaders/Wuthering Waves/Include/HoyoToonWutheringWaves-declaration.hlsl b/Shaders/Wuthering Waves/Include/HoyoToonWutheringWaves-declaration.hlsl
@@ -15,10 +15,14 @@ Texture2D _SDF;
 Texture2D _Noise;
 Texture2D _Noise02;
 Texture2D _ShakeNoise;
+Texture2D _Second_RGB;
+Texture2D _CommonNoiseMap;
 SamplerState sampler_MainTex;
 SamplerState sampler_linear_repeat;
 SamplerState sampler_linear_clamp;
 
+float4 _CommonNoiseMap_ST;
+
 
 float4 _EM_TexelSize; // x 1/height y 1/width z height w width
 
@@ -210,6 +214,18 @@ float _RimHardness;
 float _Metalllic;
 float _UsePBR;
 
+// aurora
+float _UseStarrySky;
+float _AuroraAmount;
+float _Second_NoiseStrength;
+float _Second_Height;
+float _Second_HeightRadio;
+float _UseNoise;
+float _WaveAmount;
+float _WaveNormalAmount;
+float _WaveSpeed;
+float _WaveTiling;
+
 // debug
 float _DebugMode;
 float _DebugDiffuse;

diff --git a/Shaders/Wuthering Waves/Include/HoyoToonWutheringWaves-program.hlsl b/Shaders/Wuthering Waves/Include/HoyoToonWutheringWaves-program.hlsl
@@ -164,6 +164,7 @@ fixed4 ps_model (vertex_out i) : SV_Target
         #if defined(use_stocking)
             }
         #endif
+        if(_UseStarrySky) aurora_wave(uv, i.ws_pos, normal, tangent, view, i.ss_pos, color.xyz);
     }
     #if defined(is_face)
     else if(_MaterialType == 1) // face shading, there isnt