From 0dca47881779f3eee4b0daec26f803a42a53f57e Mon Sep 17 00:00:00 2001
From: "Arthur Brainville (Ybalrid)" <ybalrid@ybalrid.info>
Date: Wed, 21 Feb 2018 10:02:04 +0100
Subject: [PATCH] load texture coordinates

Signed-off by: Arthur Brainville (Ybalrid) <ybalrid@ybalrid.info>
---
 examples/raytrace/gltf-loader.cc | 37 ++++++++++++++++++++++++++++++++
 examples/raytrace/gltf-loader.h  | 16 ++++++++++++++
 2 files changed, 53 insertions(+)

diff --git a/examples/raytrace/gltf-loader.cc b/examples/raytrace/gltf-loader.cc
index 1553166..57d6a95 100644
--- a/examples/raytrace/gltf-loader.cc
+++ b/examples/raytrace/gltf-loader.cc
@@ -240,6 +240,43 @@ bool LoadGLTF(const std::string &filename, float scale,
                   break;
               }
             }
+
+            if (attribute.first == "TEXCOORD_0") {
+              std::cout << "Found texture coordinates\n";
+
+              switch (attribAccessor.type) {
+                case TINYGLTF_TYPE_VEC2: {
+                  switch (attribAccessor.componentType) {
+                    case TINYGLTF_COMPONENT_TYPE_FLOAT: {
+                      v2fArray uvs(
+                          arrayAdapter<v2f>(dataPtr, count, byte_stride));
+                      for (size_t i{0}; i < uvs.size(); ++i) {
+                        const auto v = uvs[i];
+                        std::cout << '(' << v.x << ", " << v.y << ")\n";
+
+                        loadedMesh.facevarying_uvs.push_back(v.x);
+                        loadedMesh.facevarying_uvs.push_back(v.y);
+                      }
+                    } break;
+                    case TINYGLTF_COMPONENT_TYPE_DOUBLE: {
+                      v2dArray uvs(
+                          arrayAdapter<v2d>(dataPtr, count, byte_stride));
+                      for (size_t i{0}; i < uvs.size(); ++i) {
+                        const auto v = uvs[i];
+                        std::cout << '(' << v.x << ", " << v.y << ")\n";
+
+                        loadedMesh.facevarying_uvs.push_back(v.x);
+                        loadedMesh.facevarying_uvs.push_back(v.y);
+                      }
+                    } break;
+                    default:
+                      break;
+                  }
+                } break;
+                default:
+                  break;
+              }
+            }
           }
         }
 
diff --git a/examples/raytrace/gltf-loader.h b/examples/raytrace/gltf-loader.h
index 83a1f6b..567ebd8 100644
--- a/examples/raytrace/gltf-loader.h
+++ b/examples/raytrace/gltf-loader.h
@@ -104,6 +104,14 @@ using v2d = v2<double>;
 using v3d = v3<double>;
 using v4d = v4<double>;
 
+struct v2fArray {
+  arrayAdapter<v2f> adapter;
+  v2fArray(const arrayAdapter<v2f> &a) : adapter(a) {}
+
+  v2f operator[](size_t position) const { return adapter[position]; }
+  size_t size() const { return adapter.elemCount; }
+};
+
 struct v3fArray {
   arrayAdapter<v3f> adapter;
   v3fArray(const arrayAdapter<v3f> &a) : adapter(a) {}
@@ -120,6 +128,14 @@ struct v4fArray {
   size_t size() const { return adapter.elemCount; }
 };
 
+struct v2dArray {
+  arrayAdapter<v2d> adapter;
+  v2dArray(const arrayAdapter<v2d> &a) : adapter(a) {}
+
+  v2d operator[](size_t position) const { return adapter[position]; }
+  size_t size() const { return adapter.elemCount; }
+};
+
 struct v3dArray {
   arrayAdapter<v3d> adapter;
   v3dArray(const arrayAdapter<v3d> &a) : adapter(a) {}