修改水

Packages/com.waveharmonic.crest/Runtime/Shaders/Library/Utility/Depth.hlsl

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+// Crest Water System
+// Copyright © 2024 Wave Harmonic. All rights reserved.
+
+// Helpers that will only be used for shaders (eg depth, lighting etc).
+
+#ifndef d_WaveHarmonic_Utility_Depth
+#define d_WaveHarmonic_Utility_Depth
+
+#include "Packages/com.waveharmonic.crest/Runtime/Shaders/Library/Utility/Macros.hlsl"
+
+// Silence Unity errors in SG editor.
+#ifdef SHADERGRAPH_PREVIEW
+#define LOAD_DEPTH_TEXTURE_X(a, b) 0
+#define TEXTURE2D_X(t) Texture2D t
+#else
+#define LOAD_DEPTH_TEXTURE_X(textureName, coord2) LOAD_TEXTURE2D_X(textureName, coord2).r
+#endif
+
+m_UtilityNameSpace
+
+// Taken from:
+// https://www.cyanilux.com/tutorials/depth/#depth-output
+float LinearDepthToNonLinear(float depth, float4 zBufferParameters)
+{
+    return (1.0 - depth * zBufferParameters.y) / (depth * zBufferParameters.x);
+}
+
+// Taken from:
+// https://www.cyanilux.com/tutorials/depth/#depth-output
+float EyeDepthToNonLinear(float depth, float4 zBufferParameters)
+{
+    return (1.0 - depth * zBufferParameters.w) / (depth * zBufferParameters.z);
+}
+
+// Same as LinearEyeDepth except supports orthographic projection. Use projection keywords to restrict support to either
+// of these modes as an optimisation.
+float CrestLinearEyeDepth(const float i_rawDepth)
+{
+#if !defined(_PROJECTION_ORTHOGRAPHIC)
+    // Handles UNITY_REVERSED_Z for us.
+#if defined(UNITY_CG_INCLUDED)
+    float perspective = LinearEyeDepth(i_rawDepth);
+#elif defined(UNITY_COMMON_INCLUDED)
+    float perspective = LinearEyeDepth(i_rawDepth, _ZBufferParams);
+#endif
+#endif // _PROJECTION
+
+#if !defined(_PROJECTION_PERSPECTIVE)
+    // Orthographic Depth taken and modified from:
+    // https://github.com/keijiro/DepthInverseProjection/blob/master/Assets/InverseProjection/Resources/InverseProjection.shader
+    float near = _ProjectionParams.y;
+    float far  = _ProjectionParams.z;
+    float isOrthographic = unity_OrthoParams.w;
+
+#if defined(UNITY_REVERSED_Z)
+    float orthographic = lerp(far, near, i_rawDepth);
+#else
+    float orthographic = lerp(near, far, i_rawDepth);
+#endif // UNITY_REVERSED_Z
+#endif // _PROJECTION
+
+#if defined(_PROJECTION_ORTHOGRAPHIC)
+    return orthographic;
+#elif defined(_PROJECTION_PERSPECTIVE)
+    return perspective;
+#else
+    // If a shader does not have the projection enumeration, then assume they want to support both projection modes.
+    return lerp(perspective, orthographic, isOrthographic);
+#endif // _PROJECTION
+}
+
+m_UtilityNameSpaceEnd
+
+#endif // d_WaveHarmonic_Utility_Depth