47 lines
1.2 KiB
HLSL
47 lines
1.2 KiB
HLSL
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#ifndef PDEPTH_INCLUDED
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#define PDEPTH_INCLUDED
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#include "PCommon.cginc"
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#if !defined(POSEIDON_SRP)
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UNITY_DECLARE_DEPTH_TEXTURE(_CameraDepthTexture);
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float4 _CameraDepthTexture_TexelSize;
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#endif
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float GetSceneDepth(float4 screenPos)
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{
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#if !defined(POSEIDON_SRP)
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screenPos = float4(screenPos.xyz, screenPos.w + 0.00000000001);
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float depth01 = SAMPLE_DEPTH_TEXTURE_PROJ(_CameraDepthTexture, UNITY_PROJ_COORD(screenPos));
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float perpsDepth = LinearEyeDepth(depth01);
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#else
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float2 uv = float2(screenPos.xy / screenPos.w);
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uv = UnityStereoTransformScreenSpaceTex(uv);
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float depth01 = SHADERGRAPH_SAMPLE_SCENE_DEPTH(uv);
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float perpsDepth = LinearEyeDepth(depth01, _ZBufferParams);
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#endif
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#if defined(UNITY_REVERSED_Z)
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depth01 = 1 - depth01;
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#endif
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float orthoDepth = lerp(GetNearPlane(), GetFarPlane(), depth01);
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float depth = lerp(perpsDepth, orthoDepth, IsOrtho());
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return depth;
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}
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float GetSurfaceDepth(float4 worldPos)
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{
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float4 viewPos = mul(UNITY_MATRIX_V, worldPos);
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return - viewPos.z;
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}
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float GetDepthFade(float sceneDepth, float surfaceDepth, float maxDepth)
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{
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float waterDepth = sceneDepth - surfaceDepth;
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float depthFade = 1 - saturate(InverseLerpUnclamped(0, maxDepth, waterDepth));
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return depthFade;
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}
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#endif
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