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.
This commit is contained in:
Adam Brown 2020-12-01 15:49:39 -08:00
parent ba51af7904
commit 23c754360a
4 changed files with 2715 additions and 3294 deletions

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@ -141,11 +141,11 @@ 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;

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@ -671,7 +671,7 @@ 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:

File diff suppressed because it is too large Load Diff

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@ -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
{
Planar,
Ortho,
LSCM,
Piecewise,
Invalid
};
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
{
UInt16,
UInt32
};
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
{
Success, // No error.
Error, // Unspecified error.
IndexOutOfRange, // An index is >= MeshDecl vertexCount.
InvalidIndexCount // Not evenly divisible by 3 - expecting triangles.
};
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
{
AddMesh,
ComputeCharts,
ParameterizeCharts,
PackCharts,
BuildOutputMeshes
};
enum class ProgressCategory {
AddMesh,
ComputeCharts,
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