From 05bc0341a8386149e09ed0b849c6ef40d53d9076 Mon Sep 17 00:00:00 2001
From: Evan Hemsley <evan@moonside.games>
Date: Wed, 29 Jul 2020 01:35:11 -0700
Subject: [PATCH] enable reading texture from GLB

---
 Importer.cs | 22 +++++++++++++++++++---
 Model.cs    | 13 +++++++++++++
 2 files changed, 32 insertions(+), 3 deletions(-)

diff --git a/Importer.cs b/Importer.cs
index 394b3e1..1369802 100644
--- a/Importer.cs
+++ b/Importer.cs
@@ -30,7 +30,17 @@ namespace Smuggler
                 meshes.Add(new Mesh(meshParts.ToArray()));
             }
 
-            return new Model(meshes.ToArray());
+            var model = new Model(meshes.ToArray());
+
+            /* TODO: BasicEffect only supports one texture but GLTF supports several */
+
+            if (sharpModel.LogicalTextures.Count > 0)
+            {
+                var fnaTexture = Texture2D.FromStream(graphicsDevice, sharpModel.LogicalTextures[0].PrimaryImage.Content.Open());
+                model.SetTexture(fnaTexture);
+            }
+
+            return model;
         }
 
         private static System.Type InferVertexType(SharpGLTF.Schema2.ModelRoot model)
@@ -135,17 +145,23 @@ namespace Smuggler
                 ImportVertexPositionTexture(primitive, vertexBuffer, indices, positions);
             }
 
+            /* TODO: We need a new Effect subclass to support some GLTF features */
+
+            var effect = new BasicEffect(graphicsDevice);
+            effect.EnableDefaultLighting();
+            effect.PreferPerPixelLighting = true;
+
             return new MeshPart(
                 vertexBuffer,
                 indexBuffer,
                 positions,
                 triangles,
-                new BasicEffect(graphicsDevice)
+                effect
             );
         }
 
         /* Attribute Getters */
-        
+
         private static Vector3[] Positions(SharpGLTF.Schema2.MeshPrimitive primitive)
         {
             var positionAccessor = primitive.GetVertexAccessor("POSITION").AsVector3Array();
diff --git a/Model.cs b/Model.cs
index abdbf3e..ed3ec25 100644
--- a/Model.cs
+++ b/Model.cs
@@ -6,12 +6,25 @@ namespace Smuggler
     public class Model
     {
         public Mesh[] Meshes { get; }
+        public Texture2D[] Textures { get; }
 
         public Model(Mesh[] meshes)
         {
             Meshes = meshes;
         }
 
+        public void SetTexture(Texture2D texture)
+        {
+            foreach (var mesh in Meshes)
+            {
+                foreach (var meshPart in mesh.MeshParts)
+                {
+                    meshPart.Effect.TextureEnabled = true;
+                    meshPart.Effect.Texture = texture;
+                }
+            }
+        }
+
         public void Draw(GraphicsDevice graphicsDevice, Matrix world, Matrix view, Matrix projection)
         {
             foreach (var mesh in Meshes)