xatlas: Sync with upstream 5571fc7

Fixes #44017 by changing the `normalize()` function to check for non-negative rather than non-zero via an epsilon check.

(cherry picked from commit 23c754360a)

modules/xatlas_unwrap/register_types.cpp

@@ -64,11 +64,11 @@ bool xatlas_mesh_lightmap_unwrap_callback(float p_texel_size, const float *p_ver
 
 	xatlas::Atlas *atlas = xatlas::Create();
 	printf("Adding mesh..\n");
-	xatlas::AddMeshError::Enum err = xatlas::AddMesh(atlas, input_mesh, 1);
-	ERR_FAIL_COND_V_MSG(err != xatlas::AddMeshError::Enum::Success, false, xatlas::StringForEnum(err));
+	xatlas::AddMeshError err = xatlas::AddMesh(atlas, input_mesh, 1);
+	ERR_FAIL_COND_V_MSG(err != xatlas::AddMeshError::Success, false, xatlas::StringForEnum(err));
 
 	printf("Generate..\n");
-	xatlas::Generate(atlas, chart_options, xatlas::ParameterizeOptions(), pack_options);
+	xatlas::Generate(atlas, chart_options, xatlas::PackOptions());
 
 	*r_size_hint_x = atlas->width;
 	*r_size_hint_y = atlas->height;

thirdparty/README.md

@@ -488,7 +488,7 @@ File extracted from upstream release tarball:
 ## xatlas
 
 - Upstream: https://github.com/jpcy/xatlas
-- Version: git (470576d3516f7e6d8b4554e7c941194a935969fd, 2020)
+- Version: git (5571fc7ef0d06832947c0a935ccdcf083f7a9264, 2020)
 - License: MIT
 
 Files extracted from upstream source:

thirdparty/xatlas/xatlas.h

@@ -31,35 +31,30 @@ Copyright NVIDIA Corporation 2006 -- Ignacio Castano <icastano@nvidia.com>
 #pragma once
 #ifndef XATLAS_H
 #define XATLAS_H
+#include <stddef.h>
 #include <stdint.h>
 
 namespace xatlas {
 
-struct ChartType
-{
-	enum Enum
-	{
+enum class ChartType {
 	Planar,
 	Ortho,
 	LSCM,
 	Piecewise,
 	Invalid
 };
-};
 
 // A group of connected faces, belonging to a single atlas.
-struct Chart
-{
+struct Chart {
 	uint32_t *faceArray;
 	uint32_t atlasIndex; // Sub-atlas index.
 	uint32_t faceCount;
-	ChartType::Enum type;
+	ChartType type;
 	uint32_t material;
 };
 
 // Output vertex.
-struct Vertex
-{
+struct Vertex {
 	int32_t atlasIndex; // Sub-atlas index. -1 if the vertex doesn't exist in any atlas.
 	int32_t chartIndex; // -1 if the vertex doesn't exist in any chart.
 	float uv[2]; // Not normalized - values are in Atlas width and height range.
@@ -67,8 +62,7 @@ struct Vertex
 };
 
 // Output mesh.
-struct Mesh
-{
+struct Mesh {
 	Chart *chartArray;
 	uint32_t *indexArray;
 	Vertex *vertexArray;
@@ -83,16 +77,15 @@ static const uint32_t kImageIsBilinearBit = 0x40000000;
 static const uint32_t kImageIsPaddingBit = 0x20000000;
 
 // Empty on creation. Populated after charts are packed.
-struct Atlas
-{
+struct Atlas {
 	uint32_t *image;
 	Mesh *meshes; // The output meshes, corresponding to each AddMesh call.
+	float *utilization; // Normalized atlas texel utilization array. E.g. a value of 0.8 means 20% empty space. atlasCount in length.
 	uint32_t width; // Atlas width in texels.
 	uint32_t height; // Atlas height in texels.
 	uint32_t atlasCount; // Number of sub-atlases. Equal to 0 unless PackOptions resolution is changed from default (0).
 	uint32_t chartCount; // Total number of charts in all meshes.
 	uint32_t meshCount; // Number of output meshes. Equal to the number of times AddMesh was called.
-	float *utilization; // Normalized atlas texel utilization array. E.g. a value of 0.8 means 20% empty space. atlasCount in length.
 	float texelsPerUnit; // Equal to PackOptions texelsPerUnit if texelsPerUnit > 0, otherwise an estimated value to match PackOptions resolution.
 };
 
@@ -101,73 +94,76 @@ Atlas *Create();
 
 void Destroy(Atlas *atlas);
 
-struct IndexFormat
-{
-	enum Enum
-	{
+enum class IndexFormat {
 	UInt16,
 	UInt32
 };
-};
 
 // Input mesh declaration.
-struct MeshDecl
-{
+struct MeshDecl {
 	const void *vertexPositionData = nullptr;
 	const void *vertexNormalData = nullptr; // optional
 	const void *vertexUvData = nullptr; // optional. The input UVs are provided as a hint to the chart generator.
 	const void *indexData = nullptr; // optional
 
-	// Optional. indexCount / 3 (triangle count) in length.
+	// Optional. Must be faceCount in length.
 	// Don't atlas faces set to true. Ignored faces still exist in the output meshes, Vertex uv is set to (0, 0) and Vertex atlasIndex to -1.
 	const bool *faceIgnoreData = nullptr;
 
+	// Optional. Must be faceCount in length.
+	// Only faces with the same material will be assigned to the same chart.
+	const uint32_t *faceMaterialData = nullptr;
+
+	// Optional. Must be faceCount in length.
+	// Polygon / n-gon support. Faces are assumed to be triangles if this is null.
+	const uint8_t *faceVertexCount = nullptr;
+
 	uint32_t vertexCount = 0;
 	uint32_t vertexPositionStride = 0;
 	uint32_t vertexNormalStride = 0; // optional
 	uint32_t vertexUvStride = 0; // optional
 	uint32_t indexCount = 0;
 	int32_t indexOffset = 0; // optional. Add this offset to all indices.
-	IndexFormat::Enum indexFormat = IndexFormat::UInt16;
+	uint32_t faceCount = 0; // Optional if faceVertexCount is null. Otherwise assumed to be indexCount / 3.
+	IndexFormat indexFormat = IndexFormat::UInt16;
 
 	// Vertex positions within epsilon distance of each other are considered colocal.
 	float epsilon = 1.192092896e-07F;
 };
 
-struct AddMeshError
-{
-	enum Enum
-	{
+enum class AddMeshError {
 	Success, // No error.
 	Error, // Unspecified error.
 	IndexOutOfRange, // An index is >= MeshDecl vertexCount.
+	InvalidFaceVertexCount, // Must be >= 3.
 	InvalidIndexCount // Not evenly divisible by 3 - expecting triangles.
 };
-};
 
 // Add a mesh to the atlas. MeshDecl data is copied, so it can be freed after AddMesh returns.
-AddMeshError::Enum AddMesh(Atlas *atlas, const MeshDecl &meshDecl, uint32_t meshCountHint = 0);
+AddMeshError AddMesh(Atlas *atlas, const MeshDecl &meshDecl, uint32_t meshCountHint = 0);
 
 // Wait for AddMesh async processing to finish. ComputeCharts / Generate call this internally.
 void AddMeshJoin(Atlas *atlas);
 
-struct UvMeshDecl
-{
+struct UvMeshDecl {
 	const void *vertexUvData = nullptr;
 	const void *indexData = nullptr; // optional
-	const uint32_t *faceMaterialData = nullptr; // Optional. Faces with different materials won't be assigned to the same chart. Must be indexCount / 3 in length.
+	const uint32_t *faceMaterialData = nullptr; // Optional. Overlapping UVs should be assigned a different material. Must be indexCount / 3 in length.
 	uint32_t vertexCount = 0;
 	uint32_t vertexStride = 0;
 	uint32_t indexCount = 0;
 	int32_t indexOffset = 0; // optional. Add this offset to all indices.
-	IndexFormat::Enum indexFormat = IndexFormat::UInt16;
-	bool rotateCharts = true;
+	IndexFormat indexFormat = IndexFormat::UInt16;
 };
 
-AddMeshError::Enum AddUvMesh(Atlas *atlas, const UvMeshDecl &decl);
+AddMeshError AddUvMesh(Atlas *atlas, const UvMeshDecl &decl);
+
+// Custom parameterization function. texcoords initial values are an orthogonal parameterization.
+typedef void (*ParameterizeFunc)(const float *positions, float *texcoords, uint32_t vertexCount, const uint32_t *indices, uint32_t indexCount);
+
+struct ChartOptions {
+	ParameterizeFunc paramFunc = nullptr;
 
-struct ChartOptions
-{
 	float maxChartArea = 0.0f; // Don't grow charts to be larger than this. 0 means no limit.
 	float maxBoundaryLength = 0.0f; // Don't grow charts to have a longer boundary than this. 0 means no limit.
 
@@ -180,38 +176,15 @@ struct ChartOptions
 
 	float maxCost = 2.0f; // If total of all metrics * weights > maxCost, don't grow chart. Lower values result in more charts.
 	uint32_t maxIterations = 1; // Number of iterations of the chart growing and seeding phases. Higher values result in better charts.
+
+	bool useInputMeshUvs = false; // Use MeshDecl::vertexUvData for charts.
+	bool fixWinding = false; // Enforce consistent texture coordinate winding.
 };
 
 // Call after all AddMesh calls. Can be called multiple times to recompute charts with different options.
 void ComputeCharts(Atlas *atlas, ChartOptions options = ChartOptions());
 
-// Custom parameterization function. texcoords initial values are an orthogonal parameterization.
-typedef void (*ParameterizeFunc)(const float *positions, float *texcoords, uint32_t vertexCount, const uint32_t *indices, uint32_t indexCount);
-
-struct ParameterizeOptions
-{
-	ParameterizeFunc func = nullptr;
-	bool closeHoles = true; // If the custom parameterization function works with multiple boundaries, this can be set to false to improve performance.
-	bool fixTJunctions = true; // If meshes don't have T-junctions, this can be set to false to improve performance.
-};
-
-// Call after ComputeCharts. Can be called multiple times to re-parameterize charts with a different ParameterizeFunc.
-void ParameterizeCharts(Atlas *atlas, ParameterizeOptions options = ParameterizeOptions());
-
-struct PackOptions
-{
-	// Leave space around charts for texels that would be sampled by bilinear filtering.
-	bool bilinear = true;
-
-	// Align charts to 4x4 blocks. Also improves packing speed, since there are fewer possible chart locations to consider.
-	bool blockAlign = false;
-
-	// Slower, but gives the best result. If false, use random chart placement.
-	bool bruteForce = false;
-
-	// Create Atlas::image
-	bool createImage = false;
-
+struct PackOptions {
 	// Charts larger than this will be scaled down. 0 means no limit.
 	uint32_t maxChartSize = 0;
 
@@ -227,29 +200,42 @@ struct PackOptions
 	// If not 0, and texelsPerUnit is not 0, generate one or more atlases with that exact resolution.
 	// If not 0, and texelsPerUnit is 0, texelsPerUnit is estimated to approximately match the resolution.
 	uint32_t resolution = 0;
+
+	// Leave space around charts for texels that would be sampled by bilinear filtering.
+	bool bilinear = true;
+
+	// Align charts to 4x4 blocks. Also improves packing speed, since there are fewer possible chart locations to consider.
+	bool blockAlign = false;
+
+	// Slower, but gives the best result. If false, use random chart placement.
+	bool bruteForce = false;
+
+	// Create Atlas::image
+	bool createImage = false;
+
+	// Rotate charts to the axis of their convex hull.
+	bool rotateChartsToAxis = true;
+
+	// Rotate charts to improve packing.
+	bool rotateCharts = true;
 };
 
-// Call after ParameterizeCharts. Can be called multiple times to re-pack charts with different options.
+// Call after ComputeCharts. Can be called multiple times to re-pack charts with different options.
 void PackCharts(Atlas *atlas, PackOptions packOptions = PackOptions());
 
-// Equivalent to calling ComputeCharts, ParameterizeCharts and PackCharts in sequence. Can be called multiple times to regenerate with different options.
-void Generate(Atlas *atlas, ChartOptions chartOptions = ChartOptions(), ParameterizeOptions parameterizeOptions = ParameterizeOptions(), PackOptions packOptions = PackOptions());
+// Equivalent to calling ComputeCharts and PackCharts in sequence. Can be called multiple times to regenerate with different options.
+void Generate(Atlas *atlas, ChartOptions chartOptions = ChartOptions(), PackOptions packOptions = PackOptions());
 
 // Progress tracking.
-struct ProgressCategory
-{
-	enum Enum
-	{
+enum class ProgressCategory {
 	AddMesh,
 	ComputeCharts,
-		ParameterizeCharts,
 	PackCharts,
 	BuildOutputMeshes
 };
-};
 
 // May be called from any thread. Return false to cancel.
-typedef bool (*ProgressFunc)(ProgressCategory::Enum category, int progress, void *userData);
+typedef bool (*ProgressFunc)(ProgressCategory category, int progress, void *userData);
 
 void SetProgressCallback(Atlas *atlas, ProgressFunc progressFunc = nullptr, void *progressUserData = nullptr);
 
@@ -263,8 +249,8 @@ typedef int (*PrintFunc)(const char *, ...);
 void SetPrint(PrintFunc print, bool verbose);
 
 // Helper functions for error messages.
-const char *StringForEnum(AddMeshError::Enum error);
-const char *StringForEnum(ProgressCategory::Enum category);
+const char *StringForEnum(AddMeshError error);
+const char *StringForEnum(ProgressCategory category);
 
 } // namespace xatlas