116 lines
3.8 KiB
HLSL
116 lines
3.8 KiB
HLSL
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#ifndef VOLUMETRIC_FOG_2_COMMONS_URP
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#define VOLUMETRIC_FOG_2_COMMONS_URP
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/DeclareDepthTexture.hlsl"
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// ***** Custom options ************
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//#define ORTHO_SUPPORT
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//#define USE_ALTERNATE_RECONSTRUCT_API
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// Specify max raymarch iterations
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#define MAX_ITERATIONS 500
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// Uncomment to enable blue noise
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#define FOG_BLUE_NOISE
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// Uncomment to improve compatibility with WebGL
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//#define WEBGL_COMPATIBILITY_MODE
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// ***** Common URP code ***********
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#if defined(USE_ALTERNATE_RECONSTRUCT_API)
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#define CLAMP_RAY_DEPTH(rayStart, scrPos, t1) ClampRayDepthAlt(rayStart, scrPos, t1)
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#else
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#define CLAMP_RAY_DEPTH(rayStart, scrPos, t1) ClampRayDepth(rayStart, scrPos, t1)
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#endif
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TEXTURE2D(_CustomDepthTexture);
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SAMPLER(sampler_CustomDepthTexture);
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int VF2_FLIP_DEPTH_TEXTURE;
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inline float GetRawDepth(float2 uv) {
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float sceneDepth = SampleSceneDepth(VF2_FLIP_DEPTH_TEXTURE ? float2(uv.x, 1.0 - uv.y) : uv);
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#if VF2_DEPTH_PREPASS
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float customDepth = SAMPLE_DEPTH_TEXTURE(_CustomDepthTexture, sampler_CustomDepthTexture, uv );
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#if UNITY_REVERSED_Z
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sceneDepth = max(sceneDepth, customDepth);
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#else
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sceneDepth = min(sceneDepth, customDepth);
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#endif
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#endif
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return sceneDepth;
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}
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void ClampRayDepth(float3 rayStart, float4 scrPos, inout float t1) {
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float2 uv = scrPos.xy / scrPos.w;
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// World position reconstruction
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float depth = GetRawDepth(uv);
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float4 raw = mul(UNITY_MATRIX_I_VP, float4(uv * 2.0 - 1.0, depth, 1.0));
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float3 worldPos = raw.xyz / raw.w;
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float z = distance(rayStart, worldPos.xyz);
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t1 = min(t1, z);
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}
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// Alternate reconstruct API; URP 7.4 doesn't set UNITY_MATRIX_I_VP correctly in VR, so we need to use this alternate method
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inline float GetLinearEyeDepth(float2 uv) {
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float rawDepth = SampleSceneDepth(VF2_FLIP_DEPTH_TEXTURE ? float2(uv.x, 1.0 - uv.y) : uv);
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float sceneLinearDepth = LinearEyeDepth(rawDepth, _ZBufferParams);
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#if defined(ORTHO_SUPPORT)
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#if UNITY_REVERSED_Z
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rawDepth = 1.0 - rawDepth;
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#endif
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float orthoDepth = lerp(_ProjectionParams.y, _ProjectionParams.z, rawDepth);
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sceneLinearDepth = lerp(sceneLinearDepth, orthoDepth, unity_OrthoParams.w);
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#endif
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#if VF2_DEPTH_PREPASS
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float customRawDepth = SAMPLE_DEPTH_TEXTURE(_CustomDepthTexture, sampler_CustomDepthTexture, uv);
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float customLinearDepth = LinearEyeDepth(customRawDepth, _ZBufferParams);
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#if defined(ORTHO_SUPPORT)
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#if UNITY_REVERSED_Z
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customRawDepth = 1.0 - customRawDepth;
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#endif
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float customOrthoDepth = lerp(_ProjectionParams.y, _ProjectionParams.z, customRawDepth);
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customLinearDepth = lerp(customLinearDepth, customOrthoDepth, unity_OrthoParams.w);
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#endif
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sceneLinearDepth = min(sceneLinearDepth, customLinearDepth);
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#endif
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return sceneLinearDepth;
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}
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void ClampRayDepthAlt(float3 rayStart, float4 scrPos, inout float t1) {
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float2 uv = scrPos.xy / scrPos.w;
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float vz = GetLinearEyeDepth(uv);
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#if defined(ORTHO_SUPPORT)
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if (unity_OrthoParams.w) {
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t1 = min(t1, vz);
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return;
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}
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#endif
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float2 p11_22 = float2(unity_CameraProjection._11, unity_CameraProjection._22);
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float2 suv = uv;
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#if UNITY_SINGLE_PASS_STEREO
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// If Single-Pass Stereo mode is active, transform the
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// coordinates to get the correct output UV for the current eye.
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float4 scaleOffset = unity_StereoScaleOffset[unity_StereoEyeIndex];
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suv = (suv - scaleOffset.zw) / scaleOffset.xy;
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#endif
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float3 vpos = float3((suv * 2 - 1) / p11_22, -1) * vz;
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float4 wpos = mul(unity_CameraToWorld, float4(vpos, 1));
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float z = distance(rayStart, wpos.xyz);
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t1 = min(t1, z);
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}
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#endif // VOLUMETRIC_FOG_2_COMMONS_URP
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