GitHub
6 年前
当前提交
9a93b084
共有 14 个文件被更改，包括 383 次插入 和 187 次删除
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34com.unity.render-pipelines.core/CoreRP/ShaderLibrary/CommonLighting.hlsl
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18com.unity.render-pipelines.core/CoreRP/ShaderLibrary/CommonMaterial.hlsl
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12com.unity.render-pipelines.high-definition/CHANGELOG.md
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2com.unity.render-pipelines.high-definition/HDRP/Editor/AssetProcessors/NormalMapFilteringTexturePostprocessor.cs.meta
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2com.unity.render-pipelines.high-definition/HDRP/Editor/Lighting/HDLightExplorerExtension.cs
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6com.unity.render-pipelines.high-definition/HDRP/Material/LayeredLit/LayeredLitData.hlsl
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8com.unity.render-pipelines.high-definition/HDRP/Material/Lit/Lit.hlsl
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20com.unity.render-pipelines.high-definition/HDRP/Material/Lit/LitData.hlsl
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16com.unity.render-pipelines.high-definition/HDRP/Material/Lit/LitDataIndividualLayer.hlsl
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40com.unity.render-pipelines.high-definition/HDRP/Material/MaterialEvaluation.hlsl
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16com.unity.render-pipelines.high-definition/HDRP/RenderPipeline/HDRenderPipeline.cs
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272com.unity.render-pipelines.high-definition/HDRP/Editor/AssetProcessors/NormalMapFilteringTexturePostprocessor.cs
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124com.unity.render-pipelines.high-definition/HDRP/Editor/AssetProcessors/NormalMapAverageLengthTexturePostprocessor.cs
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0/com.unity.render-pipelines.high-definition/HDRP/Editor/AssetProcessors/NormalMapFilteringTexturePostprocessor.cs.meta
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using System; |
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using UnityEngine; |
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using System.IO; |
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namespace UnityEditor.Experimental.Rendering.HDPipeline |
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{ |
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public class NormalMapFilteringTexturePostprocessor : AssetPostprocessor |
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{ |
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// This class will process a normal map and add the value of average normal length to the blue or alpha channel
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// The texture is saved as BC7.
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// Tangent space normal map: BC7 RGB (normal xy - encoded variance)
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// Object space normal map: BC7 RGBA (normal xyz - encoded variance)
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static string s_Suffix = "_NF"; |
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static string s_SuffixOS = "_OSNF"; // Suffix for object space case
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bool IsAssetTaggedAsTangentSpaceNormalMap() |
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{ |
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return Path.GetFileNameWithoutExtension(assetPath).EndsWith(s_Suffix, StringComparison.InvariantCultureIgnoreCase); |
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} |
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bool IsAssetTaggedAsObjectSpaceNormalMap() |
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{ |
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return Path.GetFileNameWithoutExtension(assetPath).EndsWith(s_SuffixOS, StringComparison.InvariantCultureIgnoreCase); |
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} |
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void OnPreprocessTexture() |
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{ |
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bool isNormalMapTangentSpace = IsAssetTaggedAsTangentSpaceNormalMap(); |
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bool isNormalMapObjectSpace = isNormalMapTangentSpace ? false : IsAssetTaggedAsObjectSpaceNormalMap(); |
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if (isNormalMapTangentSpace || isNormalMapObjectSpace) |
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{ |
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// Make sure we don't convert as a normal map.
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TextureImporter textureImporter = (TextureImporter)assetImporter; |
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textureImporter.convertToNormalmap = false; |
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//textureImporter.alphaSource = isNormalMapTangentSpace ? TextureImporterAlphaSource.None : TextureImporterAlphaSource.FromInput;
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//bool inputHasAlphaChannel = textureImporter.DoesSourceTextureHaveAlpha();
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// Hack:
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// We need Unity to create an alpha channel when using object space normal maps!
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// If it doesn't find one in input, and we set TextureImporterAlphaSource.FromInput, it will ignore our alpha values we
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// set with SetPixels in OnPostProcess, even if the Texture2D format is eg RGBA.
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// So here, we force it to create a dummy one in all cases (from gray scale)
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textureImporter.alphaSource = isNormalMapTangentSpace ? TextureImporterAlphaSource.None : TextureImporterAlphaSource.FromGrayScale; |
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textureImporter.alphaIsTransparency = false; |
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textureImporter.mipmapEnabled = true; |
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textureImporter.textureCompression = TextureImporterCompression.CompressedHQ; // This is BC7 for Mac/PC
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//textureImporter.textureCompression = TextureImporterCompression.Uncompressed;
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// We can also force a format like TextureImporterFormat.BC6H or TextureImporterFormat.BC7:
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var settings = textureImporter.GetPlatformTextureSettings("Standalone"); |
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settings.format = TextureImporterFormat.BC7; |
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settings.overridden = true; |
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textureImporter.SetPlatformTextureSettings(settings); |
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textureImporter.isReadable = true; |
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// ...works without, but Unity doc says to set it if we need read access during OnPostProcess:
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// https://docs.unity3d.com/ScriptReference/AssetPostprocessor.OnPostprocessTexture.html
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#pragma warning disable 618 // remove obsolete warning for this one
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textureImporter.linearTexture = true; // Says deprecated but won't work without it.
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#pragma warning restore 618
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textureImporter.sRGBTexture = false; // But we're setting the new property just in case it changes later...
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} |
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} |
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private static Color GetColor(Color[] source, int x, int y, int width, int height) |
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{ |
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x = (x + width) % width; // for NPOT textures
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y = (y + height) % height; |
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int index = y * width + x; |
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var c = source[index]; |
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return c; |
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} |
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private static Vector3 GetNormal(Color[] source, int x, int y, int width, int height) |
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{ |
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Vector3 n = (Vector4)GetColor(source, x, y, width, height); |
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n = 2.0f * n - Vector3.one; |
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n.Normalize(); |
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return n; |
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} |
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private static Vector3 GetAverageNormal(Color[] source, int x, int y, int width, int height, int texelFootprintW, int texelFootprintH) |
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{ |
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Vector3 averageNormal = new Vector3(0, 0, 0); |
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// Calculate the average color over the texel footprint.
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for (int i = 0; i < texelFootprintH; ++i) |
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{ |
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for (int j = 0; j < texelFootprintW; ++j) |
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{ |
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averageNormal += GetNormal(source, x + j, y + i, width, height); |
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} |
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} |
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averageNormal /= (texelFootprintW * texelFootprintH); |
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return averageNormal; |
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} |
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// Converts averageNormalLength to variance and
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// thresholds and remaps variance from [0, highestVarianceAllowed] to [0, 1]
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private static float GetEncodedVariance(float averageNormalLength) |
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{ |
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// Caution: This constant must be in sync with CommonMaterial.hlsl #define NORMALMAP_HIGHEST_VARIANCE
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const float highestVarianceAllowed = 0.03125f; // 0.25 * 0.25 / 2 = 0.0625 / 2 = 0.03125;
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// To decide to store or not the averageNormalLength directly we need to consider:
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//
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// 1) useful range vs block compression and bit encoding of that range,
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// 2) the possibly nonlinear conversion to variance,
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// 3) computation in the shader.
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//
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// For 2) we need something that can be linearly filtered by the hardware as much as possible.
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// Averages of length(average normal) are obviously not equal to length( of averages of normal)
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// (that's the point of normal map inferred-NDF filtering vs just using mip-mapping hardware on normal maps),
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// and the formula to get to variance via the vMF lobe fit is also quite nonlinear, although not
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// everywhere. We show below that the most useful part of this fit (near the 1.0 end of the length
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// of the average normal) is linear and so if we would store and filter averageNormalLength anyway
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// but limit our range to that part, we could just store and filter directly the variance in that
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// range too. (Note though that moments are linearly filterable cf LEAN, LEADR).
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// For 1), compression can further compound artifacts too so we need to consider the useful range.
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//
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// We recall:
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//
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// Ref: Frequency Domain Normal Map Filtering - http://www.cs.columbia.edu/cg/normalmap/normalmap.pdf
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// (equation 21)
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// The relationship between between the standard deviation of a Gaussian distribution and
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// the roughness parameter of a Beckmann distribution.is roughness^2 = 2 variance
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// Ref: Filtering Distributions of Normals for Shading Antialiasing, equation just after (14).
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// Relationship between gaussian lobe and vMF lobe is 2 * variance = 1 / (2 * kappa) = roughness^2
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// (Equation 36 of Normal map filtering based on The Order : 1886 SIGGRAPH course notes implementation).
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//
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// So to get variance we must use variance = 1 / (4 * kappa)
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// where
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// kappa = (averageNormalLength*(3.0f - averageNormalLengthSquared)) / (1.0f - averageNormalLengthSquared);
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//
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float averageNormalLengthSquared = averageNormalLength * averageNormalLength; |
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float variance = 0.0f; |
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if (averageNormalLengthSquared < 1.0f) |
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{ |
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float kappa = (averageNormalLength * (3.0f - averageNormalLengthSquared)) / (1.0f - averageNormalLengthSquared); |
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variance = 1.0f / (4.0f * kappa); |
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} |
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// The variance as a function of (averageNormalLength) is quite steep near 0 length, and
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// from about averageNormalLength = 0.376, variance stays under 0.2, and
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// from about averageNormalLength = 0.603, variance stays under 0.1, and goes to 0 quite
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// linearly as averageNormalLength goes to 1 with a slope of -1/4
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// http://www.wolframalpha.com/input/?i=y(x)+:%3D+(1+-+x*x)%2F(4*(3x+-+x*x*x));+x+from+0+to+1
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// Remember we do "+ min(2.0 * variance, threshold * threshold)" in NormalFiltering of CommonMaterial.hlsl
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// to effectively limit the added_roughness^2
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// when doing normal map filtering by modifying underlying BSDF roughness.
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//
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// An added variance of 0.1 gives an increase of roughness = sqrt(2 * 0.1) = 0.447, which is a huge increase already.
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// An added variance of 0.03125 gives an increase of roughness = sqrt(2 * 0.03125) = 0.25, which still a lot
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//
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// Also remember that we use a user specified threshold to effectively limit the added_roughness^2,
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// as shown above with + min(2.0 * variance, threshold * threshold)).
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// We consider the relationship between the considered range of useful added variance vs that threshold:
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// We have
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// 2*variance_max_allowed = roughness_threshold_max_allowed^2
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// variance_max_allowed = 0.5 * roughness_threshold_max_allowed^2
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//
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// Let's say we think an increased roughness^2 of threshold * threshold = 0.250^2 is enough such
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// that we will never set the threshold in the UI to anything higher than 0.250.
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// We then have:
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//
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// (0.250)^2 = (2 * variance_max_allowed)
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// variance_max_allowed = 0.25*0.25 / 2 = 0.0625/2 = 0.03125
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// 0.03125 = (1-xx)/(4*(3*x-x*x*x)) where x is lowestAverageNormalLengthAllowed
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// http://www.wolframalpha.com/input/?i=0.03125+%3D++(1+-+x*x)%2F(4*(3x+-+x*x*x));+solve+for+x+from+0+to+1
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// which gives our constants:
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//
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// highestVarianceAllowed = 0.03125f
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// lowestAverageNormalLengthAllowed = 0.8695f;
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//
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float encodedVariance = Math.Min(variance, highestVarianceAllowed) / highestVarianceAllowed; |
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return encodedVariance; |
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} |
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void OnPostprocessTexture(Texture2D texture) |
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{ |
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bool isNormalMapTangentSpace = IsAssetTaggedAsTangentSpaceNormalMap(); |
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bool isNormalMapObjectSpace = isNormalMapTangentSpace ? false : IsAssetTaggedAsObjectSpaceNormalMap(); |
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if (isNormalMapTangentSpace || isNormalMapObjectSpace) |
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{ |
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// Based on The Order : 1886 SIGGRAPH course notes implementation. Sample all normal map
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// texels from the base mip level that are within the footprint of the current mipmap texel.
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Color[] source = texture.GetPixels(0); |
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for (int m = 1; m < texture.mipmapCount; m++) |
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{ |
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Color[] c = texture.GetPixels(m); |
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int mipWidth = Math.Max(1, texture.width >> m); |
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int mipHeight = Math.Max(1, texture.height >> m); |
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int texelFootprintW = texture.width / mipWidth; |
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int texelFootprintH = texture.height / mipHeight; |
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for (int y = 0; y < mipHeight; ++y) |
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{ |
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for (int x = 0; x < mipWidth; ++x) |
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{ |
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Vector3 averageNormal = GetAverageNormal(source, x * texelFootprintW, y * texelFootprintH, |
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texture.width, texture.height, texelFootprintW, texelFootprintH); |
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int outputPosition = y * mipWidth + x; |
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// Note: As an optimization we could check what is generated in the mipmap (as it is suppose to be the average already)
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// TODO: Do some test and see if it is equivalent, for now reprocess all normal from top mips.
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// Vector3 existingAverageNormal = (Vector4)c[outputPosition];
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// existingAverageNormal = 2.0f * existingAverageNormal - Vector3.one;
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// Clamp to avoid any issue (shouldn't be required but sanitizes the normal map if needed)
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// We will also write the custom data into the blue channel to streamline the unpacking
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// shader code to fetch a 2 channel normal in RG whether we use normal map filtering or not.
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float averageNormalLength = Math.Max(0.0f, Math.Min(1.0f, averageNormal.magnitude)); |
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float outputValue = GetEncodedVariance(averageNormalLength); |
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// Finally, note that since we need to add custom data in a map channel, we can't use the Unity
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// importer UI settings TextureType == NormalMap, since it leaves channel control to Unity in
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// that case and will make it interpret the x,y,z input as the normal to compress (which it might
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// do eg in 2 channels BC5)
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//
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// We need to normalize the resulting average normal and store the x,y components in the
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// proper (n + 1)/2 range encoded values in the R,G channels:
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averageNormal.Normalize(); |
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c[outputPosition].r = (averageNormal.x + 1.0f) / 2.0f; |
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c[outputPosition].g = (averageNormal.y + 1.0f) / 2.0f; |
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if (isNormalMapTangentSpace) |
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{ |
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c[outputPosition].b = outputValue; |
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c[outputPosition].a = 1.0f; |
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} |
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else |
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{ |
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// Object space normal map needs 3 channels
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c[outputPosition].b = (averageNormal.z + 1.0f) / 2.0f; |
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c[outputPosition].a = outputValue; |
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} |
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} |
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} |
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texture.SetPixels(c, m); |
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} |
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// Now overwrite the first mip average normal channel - order is important as above we read the mip0
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// For mip 0, set the normal length to 1.
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{ |
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Color[] c = texture.GetPixels(0); |
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float outputValue = GetEncodedVariance(1.0f); |
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for (int i = 0; i < c.Length; i++) |
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{ |
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if (isNormalMapTangentSpace) |
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{ |
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c[i].b = outputValue; |
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c[i].a = 1.0f; |
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} |
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else |
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{ |
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c[i].a = outputValue; |
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} |
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} |
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texture.SetPixels(c, 0); |
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} |
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// Compression will be apply after this.
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texture.Apply(updateMipmaps: false, makeNoLongerReadable: true); |
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} |
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} |
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} |
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} |
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using System; |
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using UnityEngine; |
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using System.IO; |
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namespace UnityEditor.Experimental.Rendering.HDPipeline |
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{ |
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public class NormalMapAverageLengthTexturePostprocessor : AssetPostprocessor |
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{ |
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// This class will process a normal map and add the value of average normal length to the blue or alpha channel
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// The texture is save as BC7.
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// Tangent space normal map: BC7 RGB (normal xy - average normal length)
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// Object space normal map: BC7 RGBA (normal xyz - average normal length)
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static string s_Suffix = "_NA"; |
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//static string s_SuffixOS = "_OSNA"; // Suffix for object space case - TODO
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void OnPreprocessTexture() |
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{ |
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// Any texture with _NA suffix will store average normal lenght in alpha
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if (Path.GetFileNameWithoutExtension(assetPath).EndsWith(s_Suffix, StringComparison.InvariantCultureIgnoreCase)) |
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{ |
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// Make sure we don't convert as a normal map.
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TextureImporter textureImporter = (TextureImporter)assetImporter; |
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textureImporter.convertToNormalmap = false; |
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textureImporter.alphaSource = TextureImporterAlphaSource.None; |
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textureImporter.mipmapEnabled = true; |
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textureImporter.textureCompression = TextureImporterCompression.CompressedHQ; // This is BC7 for Mac/PC
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#pragma warning disable 618 // remove obsolete warning for this one
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textureImporter.linearTexture = true; // Says deprecated but won't work without it.
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#pragma warning restore 618
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textureImporter.sRGBTexture = false; // But we're setting the new property just in case it changes later...
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} |
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} |
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private static Color GetColor(Color[] source, int x, int y, int width, int height) |
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{ |
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x = (x + width) % width; |
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y = (y + height) % height; |
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int index = y * width + x; |
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var c = source[index]; |
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return c; |
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} |
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private static Vector3 GetNormal(Color[] source, int x, int y, int width, int height) |
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{ |
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Vector3 n = (Vector4)GetColor(source, x, y, width, height); |
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n = 2.0f * n - Vector3.one; |
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n.Normalize(); |
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return n; |
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} |
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private static Vector3 GetAverageNormal(Color[] source, int x, int y, int width, int height, int texelFootprint) |
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{ |
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Vector3 averageNormal = new Vector3(0, 0, 0); |
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// Calculate the average color over the texel footprint.
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for (int i = 0; i < texelFootprint; ++i) |
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{ |
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for (int j = 0; j < texelFootprint; ++j) |
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{ |
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averageNormal += GetNormal(source, x + i, y + j, width, height); |
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} |
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} |
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averageNormal /= (texelFootprint * texelFootprint); |
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return averageNormal; |
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} |
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void OnPostprocessTexture(Texture2D texture) |
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{ |
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if (Path.GetFileNameWithoutExtension(assetPath).EndsWith(s_Suffix, StringComparison.InvariantCultureIgnoreCase)) |
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{ |
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// Based on The Order : 1886 SIGGRAPH course notes implementation. Sample all normal map
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// texels from the base mip level that are within the footprint of the current mipmap texel.
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Color[] source = texture.GetPixels(0); |
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for (int m = 1; m < texture.mipmapCount; m++) |
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{ |
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Color[] c = texture.GetPixels(m); |
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int mipWidth = Math.Max(1, texture.width >> m); |
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int mipHeight = Math.Max(1, texture.height >> m); |
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for (int x = 0; x < mipWidth; ++x) |
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{ |
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for (int y = 0; y < mipHeight; ++y) |
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{ |
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int texelFootprint = 1 << m; |
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Vector3 averageNormal = GetAverageNormal(source, x * texelFootprint, y * texelFootprint, |
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texture.width, texture.height, texelFootprint); |
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// Store the normal length for the average normal.
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int outputPosition = y * mipWidth + x; |
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// Clamp to avoid any issue (TODO: Check this)
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// Write into the blue channel
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float averageNormalLength = Math.Max(0.0f, Math.Min(1.0f, averageNormal.magnitude)); |
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c[outputPosition].b = averageNormalLength; |
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c[outputPosition].a = 1.0f; |
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} |
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} |
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texture.SetPixels(c, m); |
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} |
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// Now overwrite the first mip average normal channel - order is important as above we read the mip0
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// For mip 0, set the normal length to 1.
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{ |
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Color[] c = texture.GetPixels(0); |
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for (int i = 0; i < c.Length; i++) |
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{ |
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c[i].b = 1.0f; |
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c[i].a = 1.0f; |
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} |
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texture.SetPixels(c, 0); |
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} |
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} |
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} |
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} |
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} |
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