221 lines
9.2 KiB
Plaintext
221 lines
9.2 KiB
Plaintext
Shader "Soullies/RetrowaveSkybox_Mobile"
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{
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Properties
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{
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[Header(Sky and Horizon)]
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_SkyColor("Sky Color", Color) = (1, 0.15, 0, 1)
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_HorizonColor("Horizon Color", Color) = (0.42, 0.10, 0.65, 1)
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_HorizonStrength("Horizon Strength", Float) = 1.0
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_HorizonHeight("Horizon/Sky Height Offset", Range(-1, 1)) = 0.0
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[Header(Procedural Sun)]
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[Toggle(_HAVESUN_ON)] _HaveSun("Have Sun", Float) = 1
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_SunSize("Sun Disc Size", Range(0.001, 1)) = 0.05
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[HDR]_SunColorOne("Sun Color Top", Color) = (0.95, 0.82, 0.29, 1)
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[HDR]_SunColorTwo("Sun Color Bottom", Color) = (0.87, 0.39, 0.61, 1)
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_SunGradStrength("Sun Gradient Strength", Float) = 10
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_SunGradHeight("Sun Gradient Height", Range(-1, 5)) = 2
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[NoScaleOffset] _SunMask("Sun Mask (Grid Map)", 2D) = "white" {}
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_SunMaskSize("Sun Mask Size", Range(-5, 1)) = 0
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[Header(Fog Equivalent Horizon Blending)]
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_FogHeight("Fog Height", Range(-10, 10)) = 1.0
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_FogPower("Fog Power", Range(0, 5)) = 1.0
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_FogContrast("Fog Contrast", Float) = 5.0
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[Header(Procedural Stars)]
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_StarDensity("Star Density", Float) = 150.0
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_StarSize("Star Size / Contrast", Range(0, 300)) = 150
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[HDR]_StarColor("Star Color", Color) = (0.9, 0.9, 0.9, 1)
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[Toggle(_PREVENTSTARS_ON)] _PreventStars("Prevent Stars on Sun", Float) = 1
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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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"RenderType"="Background"
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"Queue"="Background"
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"PreviewType"="Skybox"
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"RenderPipeline" = "UniversalPipeline"
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}
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Pass
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{
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Name "Skybox"
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ZWrite Off
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Cull Off
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ZTest LEqual
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HLSLPROGRAM
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#pragma target 3.5
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#pragma prefer_hlslcc gles
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#pragma vertex vert
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#pragma fragment frag
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#pragma shader_feature_local _HAVESUN_ON
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#pragma shader_feature_local _PREVENTSTARS_ON
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.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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};
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struct Varyings
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{
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float4 positionCS : SV_POSITION;
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float3 viewDirWS : TEXCOORD0;
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};
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CBUFFER_START(UnityPerMaterial)
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half4 _SkyColor;
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half4 _HorizonColor;
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half _HorizonStrength;
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half _HorizonHeight;
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half _SunSize;
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half4 _SunColorOne;
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half4 _SunColorTwo;
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half _SunGradStrength;
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half _SunGradHeight;
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half _SunMaskSize;
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half _FogHeight;
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half _FogPower;
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half _FogContrast;
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half _StarDensity;
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half _StarSize;
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half4 _StarColor;
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CBUFFER_END
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TEXTURE2D(_SunMask); SAMPLER(sampler_SunMask);
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// [TA Optimize] Fast 3D Hash returning float3 for Star Placement
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float3 FastHash3D_vec3(float3 p)
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{
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p = frac(p * float3(0.1031, 0.1030, 0.0973));
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p += dot(p, p.yxz + 33.33);
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return frac((p.xxy + p.yxx) * p.zyx);
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}
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Varyings vert(Attributes input)
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{
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Varyings output;
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// Unity standard skybox space
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output.positionCS = TransformObjectToHClip(input.positionOS.xyz);
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output.viewDirWS = input.positionOS.xyz;
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return output;
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}
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half4 frag(Varyings input) : SV_Target
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{
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// Must normalize local vertex pos to form spherical ray
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float3 vDir = normalize(input.viewDirWS);
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// ===================================
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// 1. SKY & HORIZON (Restored mapping scale)
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// ===================================
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// 恢复使用 asin 以保证与原版天空盒参数的非线性渐变弧度绝对一致
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// 半个圆周的 asin 值域映射常数: 1.0 / (PI / 2.0) = 0.63661977
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float skyY = asin(clamp(vDir.y, -1.0, 1.0)) * 0.63661977;
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// 去除此处的 saturate，使得 _HorizonStrength>1 时可以向天空顶部延展色彩 (原版默认行为)
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float skyMask = skyY * _HorizonStrength + _HorizonHeight;
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half3 finalColor = lerp(_HorizonColor.rgb, _SkyColor.rgb, skyMask);
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// ===================================
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// 2. PROCEDURAL SUN (Zero Acos)
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// ===================================
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half3 sunColor = half3(0,0,0);
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float sunOpacity = 0;
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#if defined(_HAVESUN_ON)
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Light mainLight = GetMainLight();
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float3 lDir = normalize(mainLight.direction);
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// [TA Optimize] Replace acos(dot) with raw dot + smoothstep
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float NdotL = dot(vDir, lDir);
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// Maps [0.001, 1.0] scale to a reasonable threshold for Dot Product
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float sunThreshold = lerp(1.0, 0.8, _SunSize);
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// Anti-aliased disc edge
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float sunFw = fwidth(NdotL);
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float sunMask = smoothstep(sunThreshold - sunFw, sunThreshold + sunFw, NdotL);
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// Vertical Local Gradient
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float localSunY = saturate(((vDir.y - lDir.y + (1.0 - sunThreshold)) / ((1.0 - sunThreshold) * 2.0)) * _SunGradStrength - _SunGradHeight);
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half3 rawSunColor = lerp(_SunColorTwo.rgb, _SunColorOne.rgb, localSunY);
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// [TA Optimize] Planar Projection UV for Sun Mask (Zero Trigo, No Spherical Math)
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float3 up = abs(lDir.y) > 0.999 ? float3(0,0,1) : float3(0,1,0); // Prevent gimbal lock
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float3 right = normalize(cross(up, lDir));
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float3 sunUp = cross(lDir, right);
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float2 sunUV = float2(dot(vDir, right), dot(vDir, sunUp));
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// 修正点：根据太阳真实的半径跨度进行缩放，映射到完美填充正负1的圆形
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float sunRadius = sqrt(max(0.0001, 1.0 - sunThreshold * sunThreshold));
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float2 sunUVNorm = sunUV / sunRadius;
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// 应用暴露出的原生 Mask 控制参数
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sunUVNorm = sunUVNorm * (1.0 - _SunMaskSize) * 0.5 + 0.5;
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half gridMask = SAMPLE_TEXTURE2D(_SunMask, sampler_SunMask, sunUVNorm).r;
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sunOpacity = gridMask * sunMask;
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sunColor = rawSunColor * sunOpacity;
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#endif
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// ===================================
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// 3. PROCEDURAL STARS (Single-Tap Cellular Noise)
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// ===================================
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half3 starFinal = half3(0,0,0);
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// [TA Optimize] 用单次计算的 3D Cell Noise 平替 9-Tap Voronoi
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// 乘以 8 是为了还原老版本在 X轴上乘 8 带来的高密度视觉错觉
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float3 scaledPos = vDir * (_StarDensity * 8.0);
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float3 cell = floor(scaledPos);
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float3 local = frac(scaledPos);
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// 获取晶格内随机星星偏移点与亮暗随机种子
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float3 randProps = FastHash3D_vec3(cell);
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// 计算当前像素到该单个星星的距离
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float dist = length(local - randProps);
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// 构造出锐利的星星斑点 (类似 Voronoi 的山峰距离场)
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float starVal = max(0.0, 1.0 - dist * 1.5); // 1.5 增强锐利度
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starVal = pow(starVal, max(1.0, max(75, _StarSize) / 10));
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// 随机让 40% 的晶格变空或变亮，使其显得自然参差不齐
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float brightness = FastHash3D_vec3(cell + 123.0).x;
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starVal *= (brightness > 0.4 ? brightness : 0.0);
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starFinal = starVal * _StarColor.rgb;
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#if defined(_PREVENTSTARS_ON)
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starFinal *= (1.0 - sunOpacity);
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#endif
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// Add everything up
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finalColor += starFinal;
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finalColor += sunColor;
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// ===================================
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// 4. GLOBAL FOG BLEND (Restored)
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// ===================================
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// 还原原版 Shader Graph 在地平线处覆盖的全局雾气混合机制
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float fogVal = saturate(_FogHeight - skyY * _FogContrast) * _FogPower;
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finalColor = lerp(finalColor, unity_FogColor.rgb, saturate(fogVal));
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return half4(finalColor, 1.0);
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}
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ENDHLSL
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}
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}
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}
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