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feat: add OpenNest.Gpu project with PartBitmap rasterizer

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Introduces the OpenNest.Gpu class library with ILGPU dependencies and a
PartBitmap class that rasterizes Drawing closed shapes into integer grids
for GPU-based overlap testing. Supports rotation and spacing dilation.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
AJ Isaacs
2026-03-07 18:21:04 -05:00
parent b83d09c3a7
commit 8d28167b2f
3 changed files with 212 additions and 0 deletions
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15
OpenNest.Gpu/OpenNest.Gpu.csproj Normal file
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@@ -0,0 +1,15 @@
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net8.0-windows</TargetFramework>
<RootNamespace>OpenNest.Gpu</RootNamespace>
<AssemblyName>OpenNest.Gpu</AssemblyName>
</PropertyGroup>
<ItemGroup>
<ProjectReference Include="..\OpenNest.Core\OpenNest.Core.csproj" />
<ProjectReference Include="..\OpenNest.Engine\OpenNest.Engine.csproj" />
</ItemGroup>
<ItemGroup>
<PackageReference Include="ILGPU" Version="1.5.1" />
<PackageReference Include="ILGPU.Algorithms" Version="1.5.1" />
</ItemGroup>
</Project>

155
OpenNest.Gpu/PartBitmap.cs Normal file
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@@ -0,0 +1,155 @@
using System;
using System.Collections.Generic;
using System.Linq;
using OpenNest.Converters;
using OpenNest.Geometry;
using OpenNest.Math;
namespace OpenNest.Gpu
{
public class PartBitmap
{
public int[] Cells { get; set; }
public int Width { get; set; }
public int Height { get; set; }
public double CellSize { get; set; }
public double OriginX { get; set; }
public double OriginY { get; set; }
public const double DefaultCellSize = 0.05;
public static PartBitmap FromDrawing(Drawing drawing, double cellSize = DefaultCellSize, double spacingDilation = 0)
{
var polygons = GetClosedPolygons(drawing);
return Rasterize(polygons, cellSize, spacingDilation);
}
public static PartBitmap FromDrawingRotated(Drawing drawing, double rotation, double cellSize = DefaultCellSize, double spacingDilation = 0)
{
var polygons = GetClosedPolygons(drawing);
if (!rotation.IsEqualTo(0))
{
foreach (var poly in polygons)
poly.Rotate(rotation);
}
return Rasterize(polygons, cellSize, spacingDilation);
}
private static PartBitmap Rasterize(List<Polygon> polygons, double cellSize, double spacingDilation)
{
if (polygons.Count == 0)
return new PartBitmap { Cells = Array.Empty<int>(), Width = 0, Height = 0, CellSize = cellSize };
var minX = double.MaxValue;
var minY = double.MaxValue;
var maxX = double.MinValue;
var maxY = double.MinValue;
foreach (var poly in polygons)
{
poly.UpdateBounds();
var bb = poly.BoundingBox;
if (bb.Left < minX) minX = bb.Left;
if (bb.Bottom < minY) minY = bb.Bottom;
if (bb.Right > maxX) maxX = bb.Right;
if (bb.Top > maxY) maxY = bb.Top;
}
minX -= spacingDilation;
minY -= spacingDilation;
maxX += spacingDilation;
maxY += spacingDilation;
var width = (int)System.Math.Ceiling((maxX - minX) / cellSize);
var height = (int)System.Math.Ceiling((maxY - minY) / cellSize);
if (width <= 0 || height <= 0)
return new PartBitmap { Cells = Array.Empty<int>(), Width = 0, Height = 0, CellSize = cellSize };
var cells = new int[width * height];
for (var y = 0; y < height; y++)
{
for (var x = 0; x < width; x++)
{
var px = minX + (x + 0.5) * cellSize;
var py = minY + (y + 0.5) * cellSize;
var pt = new Vector(px, py);
foreach (var poly in polygons)
{
if (poly.ContainsPoint(pt))
{
cells[y * width + x] = 1;
break;
}
}
}
}
var dilationCells = (int)System.Math.Ceiling(spacingDilation / cellSize);
if (dilationCells > 0)
Dilate(cells, width, height, dilationCells);
return new PartBitmap
{
Cells = cells,
Width = width,
Height = height,
CellSize = cellSize,
OriginX = minX,
OriginY = minY
};
}
private static List<Polygon> GetClosedPolygons(Drawing drawing)
{
var entities = ConvertProgram.ToGeometry(drawing.Program)
.Where(e => e.Layer != SpecialLayers.Rapid);
var shapes = Helper.GetShapes(entities);
var polygons = new List<Polygon>();
foreach (var shape in shapes)
{
if (!shape.IsClosed())
continue;
var polygon = shape.ToPolygonWithTolerance(0.05);
polygon.Close();
polygons.Add(polygon);
}
return polygons;
}
private static void Dilate(int[] cells, int width, int height, int radius)
{
var source = (int[])cells.Clone();
for (var y = 0; y < height; y++)
{
for (var x = 0; x < width; x++)
{
if (source[y * width + x] != 1)
continue;
for (var dy = -radius; dy <= radius; dy++)
{
for (var dx = -radius; dx <= radius; dx++)
{
var nx = x + dx;
var ny = y + dy;
if (nx >= 0 && nx < width && ny >= 0 && ny < height)
cells[ny * width + nx] = 1;
}
}
}
}
}
}
}

42
OpenNest.sln
View File

@@ -9,24 +9,66 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "OpenNest.Core", "OpenNest.C
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "OpenNest.Engine", "OpenNest.Engine\OpenNest.Engine.csproj", "{0083B9CC-54AD-4085-A30D-56BC6834B71A}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "OpenNest.Gpu", "OpenNest.Gpu\OpenNest.Gpu.csproj", "{1F0DD58E-9E83-4F78-A9D9-0557C0B2D96F}"
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