Add a texcoord unit test.

test/models/glTF2/BoxTexcoords-glTF/boxTexcoords.gltf

@@ -0,0 +1,172 @@
+{
+    "asset" : {
+        "generator" : "Khronos glTF Blender I/O v1.0.5",
+        "version" : "2.0"
+    },
+    "scene" : 0,
+    "scenes" : [
+        {
+            "name" : "Scene",
+            "nodes" : [
+                0,
+                1,
+                2
+            ]
+        }
+    ],
+    "nodes" : [
+        {
+            "mesh" : 0,
+            "name" : "Cube"
+        },
+        {
+            "name" : "Light",
+            "rotation" : [
+                0.16907575726509094,
+                0.7558803558349609,
+                -0.27217137813568115,
+                0.570947527885437
+            ],
+            "translation" : [
+                4.076245307922363,
+                5.903861999511719,
+                -1.0054539442062378
+            ]
+        },
+        {
+            "name" : "Camera",
+            "rotation" : [
+                0.483536034822464,
+                0.33687159419059753,
+                -0.20870360732078552,
+                0.7804827094078064
+            ],
+            "translation" : [
+                7.358891487121582,
+                4.958309173583984,
+                6.925790786743164
+            ]
+        }
+    ],
+    "materials" : [
+        {
+            "doubleSided" : true,
+            "name" : "Material",
+            "pbrMetallicRoughness" : {
+                "baseColorTexture" : {
+                    "index" : 0,
+                    "texCoord" : 0
+                },
+                "metallicFactor" : 0,
+                "metallicRoughnessTexture" : {
+                    "index" : 0,
+                    "texCoord" : 1
+                }
+            }
+        }
+    ],
+    "meshes" : [
+        {
+            "name" : "Cube",
+            "primitives" : [
+                {
+                    "attributes" : {
+                        "POSITION" : 0,
+                        "NORMAL" : 1,
+                        "TEXCOORD_0" : 2,
+                        "TEXCOORD_1" : 3
+                    },
+                    "indices" : 4,
+                    "material" : 0
+                }
+            ]
+        }
+    ],
+    "textures" : [
+        {
+            "source" : 0
+        }
+    ],
+    "images" : [
+        {
+            "mimeType" : "image/png",
+            "name" : "Material Base Color",
+            "uri" : "texture.png"
+        }
+    ],
+    "accessors" : [
+        {
+            "bufferView" : 0,
+            "componentType" : 5126,
+            "count" : 24,
+            "max" : [
+                1,
+                1,
+                1
+            ],
+            "min" : [
+                -1,
+                -1,
+                -1
+            ],
+            "type" : "VEC3"
+        },
+        {
+            "bufferView" : 1,
+            "componentType" : 5126,
+            "count" : 24,
+            "type" : "VEC3"
+        },
+        {
+            "bufferView" : 2,
+            "componentType" : 5126,
+            "count" : 24,
+            "type" : "VEC2"
+        },
+        {
+            "bufferView" : 3,
+            "componentType" : 5126,
+            "count" : 24,
+            "type" : "VEC2"
+        },
+        {
+            "bufferView" : 4,
+            "componentType" : 5123,
+            "count" : 36,
+            "type" : "SCALAR"
+        }
+    ],
+    "bufferViews" : [
+        {
+            "buffer" : 0,
+            "byteLength" : 288,
+            "byteOffset" : 0
+        },
+        {
+            "buffer" : 0,
+            "byteLength" : 288,
+            "byteOffset" : 288
+        },
+        {
+            "buffer" : 0,
+            "byteLength" : 192,
+            "byteOffset" : 576
+        },
+        {
+            "buffer" : 0,
+            "byteLength" : 192,
+            "byteOffset" : 768
+        },
+        {
+            "buffer" : 0,
+            "byteLength" : 72,
+            "byteOffset" : 960
+        }
+    ],
+    "buffers" : [
+        {
+            "byteLength" : 1032,
+            "uri" : "boxTexcoords.bin"
+        }
+    ]
+}

test/unit/utglTF2ImportExport.cpp

@@ -47,6 +47,8 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <assimp/scene.h>
 #include <array>
 
+#include <assimp/pbrmaterial.h>
+
 using namespace Assimp;
 
 class utglTF2ImportExport : public AbstractImportExportBase {
@@ -436,3 +438,30 @@ TEST_F(utglTF2ImportExport, error_string_preserved) {
 }
 
 #endif // ASSIMP_BUILD_NO_EXPORT
+
+TEST_F(utglTF2ImportExport, texcoords) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/glTF2/BoxTexcoords-glTF/boxTexcoords.gltf",
+        aiProcess_ValidateDataStructure);
+    ASSERT_NE(scene, nullptr);
+
+    ASSERT_TRUE(scene->HasMaterials());
+    const aiMaterial *material = scene->mMaterials[0];
+
+    aiString path;
+    aiTextureMapMode modes[2];
+    EXPECT_EQ(aiReturn_SUCCESS, material->GetTexture(aiTextureType_DIFFUSE, 0, &path, nullptr, nullptr,
+        nullptr, nullptr, modes));
+    EXPECT_STREQ(path.C_Str(), "texture.png");
+
+    int uvIndex = -1;
+    EXPECT_EQ(aiGetMaterialInteger(material, AI_MATKEY_GLTF_TEXTURE_TEXCOORD(aiTextureType_DIFFUSE, 0), &uvIndex), aiReturn_SUCCESS);
+    EXPECT_EQ(uvIndex, 0);
+
+    // Using manual macro expansion of AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_METALLICROUGHNESS_TEXTURE here.
+    // The following works with some but not all compilers:
+    // #define APPLY(X, Y) X(Y)
+    // ..., APPLY(AI_MATKEY_GLTF_TEXTURE_TEXCOORD, AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_METALLICROUGHNESS_TEXTURE), ...
+    EXPECT_EQ(aiGetMaterialInteger(material, AI_MATKEY_GLTF_TEXTURE_TEXCOORD(aiTextureType_UNKNOWN, 0), &uvIndex), aiReturn_SUCCESS);
+    EXPECT_EQ(uvIndex, 1);
+}