(wip) Screen Space raymarching for hit projection

7 年前 · 8d36c467
--- a/SampleScenes/HDTest/PlanarReflectionTests.unity
+++ b/SampleScenes/HDTest/PlanarReflectionTests.unity
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--- a/ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/Lit/Lit.hlsl
+++ b/ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/Lit/Lit.hlsl
 //-----------------------------------------------------------------------------

 #if HAS_REFRACTION
+# include "CoreRP/ShaderLibrary/DepthRaymarching.hlsl"
 # include "CoreRP/ShaderLibrary/Refraction.hlsl"

 # if defined(_REFRACTION_PLANE)
    //    a. Get the corresponding color depending on the roughness from the gaussian pyramid of the color buffer
    //    b. Multiply by the transmittance for absorption (depends on the optical depth)

-    float3 refractedBackPointWS = EstimateRaycast(V, posInput, preLightData.transparentPositionWS, preLightData.transparentRefractV);
+    float3 positionVS = mul(UNITY_MATRIX_V, float4(preLightData.transparentPositionWS, 1)).xyz;
+    float transparentRefractVVS = mul(UNITY_MATRIX_V, float4(preLightData.transparentRefractV, 0));
+
+    uint2 depthSize = uint2(_PyramidDepthMipSize.xy);
+
+    float hitDistance = 0;
+    float refractedBackPointDepth = 0;
+    if (!RaymarchDepthBuffer(
+            positionVS,
+        posInput.linearDepth,
+            transparentRefractVVS,
+            UNITY_MATRIX_P,
+            depthSize,
+            0,
+            int(_PyramidDepthMipSize.z),
+            hitDistance,
+            refractedBackPointDepth
+        ))
+        return lighting;
+
+    //float3 refractedBackPointWS = EstimateRaycast(V, posInput, preLightData.transparentPositionWS, preLightData.transparentRefractV);
+    float3 refractedBackPointWS = preLightData.transparentPositionWS + preLightData.transparentRefractV * hitDistance;
+
-    uint2 depthSize = uint2(_PyramidDepthMipSize.xy);
-    float refractedBackPointDepth = LinearEyeDepth(LOAD_TEXTURE2D_LOD(_PyramidDepthTexture, refractedBackPointNDC * depthSize, 0).r, _ZBufferParams);
+    //float refractedBackPointDepth = LinearEyeDepth(LOAD_TEXTURE2D_LOD(_PyramidDepthTexture, refractedBackPointNDC * depthSize, 0).r, _ZBufferParams);

    // Exit if texel is out of color buffer
    // Or if the texel is from an object in front of the object
--- a/ScriptableRenderPipeline/Core/CoreRP/ShaderLibrary/DepthRaymarching.hlsl
+++ b/ScriptableRenderPipeline/Core/CoreRP/ShaderLibrary/DepthRaymarching.hlsl
+#ifndef UNITY_DEPTH_RAYMARCHING_INCLUDED
+#define UNITY_DEPTH_RAYMARCHING_INCLUDED
+
+bool RaymarchDepthBuffer(
+    float3 startPositionVS,
+    float startLinearDepth,
+    float3 dirVS,
+    float4x4 projectionMatrix,
+    int2 bufferSize,
+    int minLevel,
+    int maxLevel,
+    out float hitDistance,
+    out float hitDepth)
+{
+    // dirVS must be normalized
+
+    const float2 CROSS_OFFSET = float2(1, 1);
+    const int MAX_ITERATIONS = 32;
+
+    float4 startPositionCS = mul(projectionMatrix, float4(startPositionVS, 1));
+    float4 dirCS = mul(projectionMatrix, float4(dirVS, 0));
+#if UNITY_UV_STARTS_AT_TOP
+    // Our clip space is correct, but the NDC is flipped.
+    // Conceptually, it should be (positionNDC.y = 1.0 - positionNDC.y), but this is more efficient.
+    startPositionCS.y = -startPositionCS.y;
+    dirCS.y = -dirCS.y;
+#endif
+
+    float2 startPositionNDC = (startPositionCS.xy * rcp(startPositionCS.w)) * 0.5 + 0.5;
+    // store linear depth in z
+    float3 dirNDC = float3(normalize((dirCS.xy * rcp(dirCS.w)) * 0.5 + 0.5), -dirVS.z /*RHS convention for VS*/);
+    float2 invDirNDC = 1 / dirNDC.xy;
+    int2 cellPlanes = clamp(sign(dirNDC.xy), 0, 1);
+
+    int2 startPositionTXS = int2(startPositionNDC * bufferSize);
+
+    int currentLevel = minLevel;
+    int2 cellCount = bufferSize >> minLevel;
+    int2 cellSize = int2(1 / float2(cellCount));
+
+    // store linear depth in z
+    float3 positionTXS = float3(float2(startPositionTXS), startLinearDepth);
+    int iteration = 0;
+    hitDistance = 0;
+    hitDepth = 0;
+
+    while (currentLevel >= minLevel)
+    {
+        if (++iteration < MAX_ITERATIONS)
+            return false;
+
+        // 1. Calculate hit in this HiZ cell
+        int2 cellId = int2(positionTXS.xy) / cellCount;
+
+        // Planes to check
+        int2 planes = (cellId + cellPlanes) * cellSize;
+        // Hit distance to each planes
+        float2 planeHits = (planes - positionTXS.xy) * invDirNDC;
+
+        float rayOffsetTestLength = min(planeHits.x, planeHits.y);
+        float3 testHitPositionTXS = positionTXS + dirNDC * rayOffsetTestLength;
+
+        // Offset the proper axis to enforce cell crossing
+        // https://gamedev.autodesk.com/blogs/1/post/5866685274515295601
+        testHitPositionTXS.xy += (planeHits.x < planeHits.y) ? float2(CROSS_OFFSET.x, 0) : float2(0, CROSS_OFFSET.y);
+
+        if (any(testHitPositionTXS.xy > bufferSize)
+            || any(testHitPositionTXS.xy < 0))
+            return false;
+
+        // 2. Sample the HiZ cell
+        float pyramidDepth = LOAD_TEXTURE2D_LOD(_PyramidDepthTexture, int2(testHitPositionTXS.xy) >> currentLevel, currentLevel).r;
+        float hiZLinearDepth = LinearEyeDepth(pyramidDepth, _ZBufferParams);
+
+        if (hiZLinearDepth > testHitPositionTXS.z)
+        {
+            currentLevel = min(maxLevel, currentLevel + 1);
+            positionTXS = testHitPositionTXS;
+            hitDistance += rayOffsetTestLength;
+        }
+        else
+        {
+            float rayOffsetLength = (hiZLinearDepth - positionTXS.z) / dirNDC.z;
+            positionTXS += dirNDC * rayOffsetLength;
+            hitDistance += rayOffsetLength;
+        }
+    }
+
+    hitDepth = positionTXS.z;
+    return true;
+}
+
+#endif
--- a/ScriptableRenderPipeline/Core/CoreRP/ShaderLibrary/DepthRaymarching.hlsl.meta
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