initial commit

.gitignore

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+## Ignore Visual Studio temporary files, build results, and
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+##
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+# Backup folder for Package Reference Convert tool in Visual Studio 2017
+MigrationBackup/
+
+# Ionide (cross platform F# VS Code tools) working folder
+.ionide/

Importer.cs

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+using System.Collections.Generic;
+using System.IO;
+using System.Numerics;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace Smuggler
+{
+    public static class Importer
+    {
+        public static Model ImportGLTF(GraphicsDevice graphicsDevice, Stream stream)
+        {
+            var sharpModel = SharpGLTF.Schema2.ModelRoot.ReadGLB(stream);
+
+            var meshes = new List<Mesh>();
+
+            foreach (var mesh in sharpModel.LogicalMeshes)
+            {
+                var meshParts = new List<MeshPart>();
+
+                foreach (var primitive in mesh.Primitives)
+                {
+                    var positionAccessor = primitive.GetVertexAccessor("POSITION").AsVector3Array();
+                    var normalAccessor = primitive.GetVertexAccessor("NORMAL").AsVector3Array();
+                    var texcoordAccessor = primitive.GetVertexAccessor("TEXCOORD_0").AsVector2Array();
+                    var indexAccessor = primitive.GetIndexAccessor().AsIndicesArray();
+
+                    var positions = new Vector3[positionAccessor.Count];
+                    var normals = new Vector3[normalAccessor.Count];
+                    var texcoords = new Vector2[texcoordAccessor.Count];
+                    var triangles = new List<Triangle>();
+
+                    for (int i = 0; i < positions.Length; i++)
+                    {
+                        var position = positionAccessor[i];
+                        positions[i] = new Vector3(-position.X, -position.Z, position.Y);
+                    }
+
+                    for (int i = 0; i < normals.Length; i++)
+                    {
+                        var normal = normalAccessor[i];
+                        normals[i] = -new Vector3(normal.X, normal.Z, normal.Y);
+                    }
+                    
+                    foreach (var (a, b, c) in primitive.GetTriangleIndices())
+                    {
+                        triangles.Add(new Triangle(a, b, c));
+                    }
+
+                    var vertexBuffer = new VertexBuffer(
+                        graphicsDevice,
+                        typeof(VertexPositionNormalTexture),
+                        positions.Length,
+                        BufferUsage.WriteOnly
+                    );
+
+                    var indexBuffer = new IndexBuffer(
+                        graphicsDevice,
+                        IndexElementSize.ThirtyTwoBits,
+                        indexAccessor.Count,
+                        BufferUsage.WriteOnly
+                    );
+
+                    var vertices = new VertexPositionNormalTexture[primitive.IndexAccessor.Count];
+                    var indices = new uint[primitive.IndexAccessor.Count];
+                    var indexCounter = 0;
+
+                    foreach (var index in primitive.GetIndices())
+                    {
+                        var position = positions[index];
+                        var normal = normals[index];
+                        var texcoord = texcoords[index];
+
+                        indices[indexCounter] = index;
+                        vertices[index] = new VertexPositionNormalTexture(
+                            new Microsoft.Xna.Framework.Vector3(position.X, position.Y, position.Z), 
+                            new Microsoft.Xna.Framework.Vector3(normal.X, normal.Y, normal.Z),
+                            new Microsoft.Xna.Framework.Vector2(texcoord.X, texcoord.Y)
+                        );
+
+                        indexCounter++;
+                    }
+
+                    indexBuffer.SetData(indices);
+                    vertexBuffer.SetData(vertices);
+
+                    meshParts.Add(
+                        new MeshPart(
+                            vertexBuffer, 
+                            indexBuffer,
+                            triangles.ToArray(),
+                            new BasicEffect(graphicsDevice)
+                        )
+                    );
+                }
+
+                meshes.Add(new Mesh(meshParts.ToArray()));
+            }
+
+            return new Model(meshes.ToArray());
+        }
+    }
+}

Mesh.cs

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+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace Smuggler
+{
+    public class Mesh
+    {
+        public MeshPart[] MeshParts { get; }
+
+        public Mesh(MeshPart[] meshParts)
+        {
+            MeshParts = meshParts;
+        }
+
+        public void Draw(GraphicsDevice graphicsDevice, Matrix world, Matrix view, Matrix projection)
+        {
+            foreach (var meshPart in MeshParts)
+            {
+                meshPart.Draw(graphicsDevice, world, view, projection);
+            }
+        }
+    }
+}

MeshPart.cs

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+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace Smuggler
+{
+    public class MeshPart
+    {
+        public IndexBuffer IndexBuffer { get; }
+        public VertexBuffer VertexBuffer { get; }
+        public Triangle[] Triangles { get; }
+        public BasicEffect Effect { get; }
+
+        public MeshPart(VertexBuffer vertexBuffer, IndexBuffer indexBuffer, Triangle[] triangles, BasicEffect effect)
+        {
+            VertexBuffer = vertexBuffer;
+            IndexBuffer = indexBuffer;
+            Triangles = triangles;
+            Effect = effect;
+        }
+
+        public void Draw(GraphicsDevice graphicsDevice, Matrix world, Matrix view, Matrix projection)
+        {
+            graphicsDevice.SetVertexBuffer(VertexBuffer);
+            graphicsDevice.Indices = IndexBuffer;
+
+            Effect.World = world;
+            Effect.View = view;
+            Effect.Projection = projection;
+
+            foreach (var pass in Effect.CurrentTechnique.Passes)
+            {
+                pass.Apply();
+                
+                graphicsDevice.DrawIndexedPrimitives(
+                    PrimitiveType.TriangleList,
+                    0,
+                    0,
+                    VertexBuffer.VertexCount,
+                    0,
+                    Triangles.Length
+                );
+            }
+        }
+    }
+}

Model.cs

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+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace Smuggler
+{
+    public class Model
+    {
+        public Mesh[] Meshes { get; }
+
+        public Model(Mesh[] meshes)
+        {
+            Meshes = meshes;
+        }
+
+        public void Draw(GraphicsDevice graphicsDevice, Matrix world, Matrix view, Matrix projection)
+        {
+            foreach (var mesh in Meshes)
+            {
+                mesh.Draw(graphicsDevice, world, view, projection);
+            }
+        }
+    }
+}

README.md

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+# Smuggler
+
+A 3D model library for sneaking around the XNA content pipeline.

Smuggler.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <RootNamespace>Smuggler</RootNamespace>
+    <Version>0.1.0</Version>
+    <Authors>Cassandra Lugo; Evan Hemsley</Authors>
+    <Copyright>Cassandra Lugo and Evan Hemsley 2020</Copyright>
+    <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
+    <AssemblyName>Smuggler</AssemblyName>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="SharpGLTF.Core" Version="1.0.0-alpha0018" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\FNA\FNA.Core.csproj"/>
+  </ItemGroup>
+  
+</Project>

Triangle.cs

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+namespace Smuggler
+{
+    public struct Triangle
+    {
+        public int A { get; }
+        public int B { get; }
+        public int C { get; }
+
+        public Triangle(int a, int b, int c)
+        {
+            A = a;
+            B = b;
+            C = c;
+        }
+    }
+}