Unit tests for TriangleExtractor

Change-Id: Iab3c5690a18edc652f314b6bf758eea7f73a1c50
Reviewed-by: Andy Nichols <andy.nichols@theqtcompany.com>

3 files changed, 414 insertions, 1 deletions

diff --git a/tests/auto/render/render.pro b/tests/auto/render/render.pro
index ac9633618..2aa837edb 100644
--- a/tests/auto/render/render.pro
+++ b/tests/auto/render/render.pro
@@ -40,5 +40,6 @@ contains(QT_CONFIG, private_tests) {
         picking \
         qboundingvolumedebug \
         boundingvolumedebug \
-        qdefaultmeshes
+        qdefaultmeshes \
+        trianglesextractor
 }
diff --git a/tests/auto/render/trianglesextractor/trianglesextractor.pro b/tests/auto/render/trianglesextractor/trianglesextractor.pro
new file mode 100644
index 000000000..d10d6c708
--- /dev/null
+++ b/tests/auto/render/trianglesextractor/trianglesextractor.pro
@@ -0,0 +1,9 @@
+TEMPLATE = app
+
+TARGET = tst_trianglesextractor
+
+QT += core-private 3dcore 3dcore-private 3drender 3drender-private testlib
+
+CONFIG += testcase
+
+SOURCES += tst_trianglesextractor.cpp
diff --git a/tests/auto/render/trianglesextractor/tst_trianglesextractor.cpp b/tests/auto/render/trianglesextractor/tst_trianglesextractor.cpp
new file mode 100644
index 000000000..0dd06dc20
--- /dev/null
+++ b/tests/auto/render/trianglesextractor/tst_trianglesextractor.cpp
@@ -0,0 +1,403 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 Klaralvdalens Datakonsult AB (KDAB).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt3D module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtTest/QTest>
+#include <Qt3DRender/private/shader_p.h>
+#include <Qt3DRender/qshaderprogram.h>
+#include <Qt3DRender/private/nodemanagers_p.h>
+#include <Qt3DRender/private/renderer_p.h>
+#include <Qt3DRender/private/qrenderaspect_p.h>
+#include <Qt3DRender/qrenderaspect.h>
+#include <Qt3DRender/private/geometryrenderermanager_p.h>
+#include <Qt3DRender/private/buffermanager_p.h>
+#include <Qt3DRender/private/geometryrenderer_p.h>
+#include <Qt3DRender/private/geometry_p.h>
+#include <Qt3DRender/private/buffer_p.h>
+#include <Qt3DRender/private/attribute_p.h>
+#include <Qt3DRender/private/triangleboundingvolume_p.h>
+#include <Qt3DRender/private/trianglesextractor_p.h>
+#include <Qt3DRender/qattribute.h>
+#include <Qt3DRender/qbuffer.h>
+#include <Qt3DRender/qgeometry.h>
+#include <Qt3DRender/qgeometryrenderer.h>
+#include <Qt3DCore/qnodevisitor.h>
+
+Qt3DRender::QGeometryRenderer *customIndexedGeometryRenderer()
+{
+    Qt3DRender::QGeometryRenderer *customMeshRenderer = new Qt3DRender::QGeometryRenderer;
+    Qt3DRender::QGeometry *customGeometry = new Qt3DRender::QGeometry(customMeshRenderer);
+
+    Qt3DRender::QBuffer *vertexDataBuffer = new Qt3DRender::QBuffer(Qt3DRender::QBuffer::VertexBuffer, customGeometry);
+    Qt3DRender::QBuffer *indexDataBuffer = new Qt3DRender::QBuffer(Qt3DRender::QBuffer::IndexBuffer, customGeometry);
+
+    // vec3 for position
+    // vec3 for colors
+    // vec3 for normals
+
+    /*          2
+               /|\
+              / | \
+             / /3\ \
+             0/___\ 1
+    */
+
+    // 4 distinct vertices
+    QByteArray vertexBufferData;
+    vertexBufferData.resize(4 * (3 + 3 + 3) * sizeof(float));
+
+    // Vertices
+    QVector3D v0(-1.0f, 0.0f, -1.0f);
+    QVector3D v1(1.0f, 0.0f, -1.0f);
+    QVector3D v2(0.0f, 1.0f, 0.0f);
+    QVector3D v3(0.0f, 0.0f, 1.0f);
+
+    // Faces Normals
+    QVector3D n023 = QVector3D::normal(v0, v2, v3);
+    QVector3D n012 = QVector3D::normal(v0, v1, v2);
+    QVector3D n310 = QVector3D::normal(v3, v1, v0);
+    QVector3D n132 = QVector3D::normal(v1, v3, v2);
+
+    // Vector Normals
+    QVector3D n0 = QVector3D(n023 + n012 + n310).normalized();
+    QVector3D n1 = QVector3D(n132 + n012 + n310).normalized();
+    QVector3D n2 = QVector3D(n132 + n012 + n023).normalized();
+    QVector3D n3 = QVector3D(n132 + n310 + n023).normalized();
+
+    // Colors
+    QVector3D red(1.0f, 0.0f, 0.0f);
+    QVector3D green(0.0f, 1.0f, 0.0f);
+    QVector3D blue(0.0f, 0.0f, 1.0f);
+    QVector3D white(1.0f, 1.0f, 1.0f);
+
+    QVector<QVector3D> vertices = QVector<QVector3D>()
+            << v0 << n0 << red
+            << v1 << n1 << blue
+            << v2 << n2 << green
+            << v3 << n3 << white;
+
+    float *rawVertexArray = reinterpret_cast<float *>(vertexBufferData.data());
+    int idx = 0;
+
+    Q_FOREACH (const QVector3D &v, vertices) {
+        rawVertexArray[idx++] = v.x();
+        rawVertexArray[idx++] = v.y();
+        rawVertexArray[idx++] = v.z();
+    }
+
+    // Indices (12)
+    QByteArray indexBufferData;
+    indexBufferData.resize(4 * 3 * sizeof(ushort));
+    ushort *rawIndexArray = reinterpret_cast<ushort *>(indexBufferData.data());
+
+    // Front
+    rawIndexArray[0] = 0;
+    rawIndexArray[1] = 1;
+    rawIndexArray[2] = 2;
+    // Bottom
+    rawIndexArray[3] = 3;
+    rawIndexArray[4] = 1;
+    rawIndexArray[5] = 0;
+    // Left
+    rawIndexArray[6] = 0;
+    rawIndexArray[7] = 2;
+    rawIndexArray[8] = 3;
+    // Right
+    rawIndexArray[9] = 1;
+    rawIndexArray[10] = 3;
+    rawIndexArray[11] = 2;
+
+    vertexDataBuffer->setData(vertexBufferData);
+    indexDataBuffer->setData(indexBufferData);
+
+    // Attributes
+    Qt3DRender::QAttribute *positionAttribute = new Qt3DRender::QAttribute();
+    positionAttribute->setAttributeType(Qt3DRender::QAttribute::VertexAttribute);
+    positionAttribute->setBuffer(vertexDataBuffer);
+    positionAttribute->setDataType(Qt3DRender::QAttribute::Float);
+    positionAttribute->setDataSize(3);
+    positionAttribute->setByteOffset(0);
+    positionAttribute->setByteStride(9 * sizeof(float));
+    positionAttribute->setCount(4);
+    positionAttribute->setName(Qt3DRender::QAttribute::defaultPositionAttributeName());
+
+    Qt3DRender::QAttribute *normalAttribute = new Qt3DRender::QAttribute();
+    normalAttribute->setAttributeType(Qt3DRender::QAttribute::VertexAttribute);
+    normalAttribute->setBuffer(vertexDataBuffer);
+    normalAttribute->setDataType(Qt3DRender::QAttribute::Float);
+    normalAttribute->setDataSize(3);
+    normalAttribute->setByteOffset(3 * sizeof(float));
+    normalAttribute->setByteStride(9 * sizeof(float));
+    normalAttribute->setCount(4);
+    normalAttribute->setName(Qt3DRender::QAttribute::defaultNormalAttributeName());
+
+    Qt3DRender::QAttribute *colorAttribute = new Qt3DRender::QAttribute();
+    colorAttribute->setAttributeType(Qt3DRender::QAttribute::VertexAttribute);
+    colorAttribute->setBuffer(vertexDataBuffer);
+    colorAttribute->setDataType(Qt3DRender::QAttribute::Float);
+    colorAttribute->setDataSize(3);
+    colorAttribute->setByteOffset(6 * sizeof(float));
+    colorAttribute->setByteStride(9 * sizeof(float));
+    colorAttribute->setCount(4);
+    colorAttribute->setName(Qt3DRender::QAttribute::defaultColorAttributeName());
+
+    Qt3DRender::QAttribute *indexAttribute = new Qt3DRender::QAttribute();
+    indexAttribute->setAttributeType(Qt3DRender::QAttribute::IndexAttribute);
+    indexAttribute->setBuffer(indexDataBuffer);
+    indexAttribute->setDataType(Qt3DRender::QAttribute::UnsignedShort);
+    indexAttribute->setDataSize(1);
+    indexAttribute->setByteOffset(0);
+    indexAttribute->setByteStride(0);
+    indexAttribute->setCount(12);
+
+    customGeometry->addAttribute(positionAttribute);
+    customGeometry->addAttribute(normalAttribute);
+    customGeometry->addAttribute(colorAttribute);
+    customGeometry->addAttribute(indexAttribute);
+
+    customMeshRenderer->setInstanceCount(1);
+    customMeshRenderer->setBaseVertex(0);
+    customMeshRenderer->setBaseInstance(0);
+    customMeshRenderer->setPrimitiveType(Qt3DRender::QGeometryRenderer::Triangles);
+    customMeshRenderer->setGeometry(customGeometry);
+    // 4 faces of 3 points
+    customMeshRenderer->setPrimitiveCount(12);
+
+    return customMeshRenderer;
+}
+
+Qt3DRender::QGeometryRenderer *customNonIndexedGeometryRenderer()
+{
+    Qt3DRender::QGeometryRenderer *customMeshRenderer = new Qt3DRender::QGeometryRenderer;
+    Qt3DRender::QGeometry *customGeometry = new Qt3DRender::QGeometry(customMeshRenderer);
+
+    Qt3DRender::QBuffer *vertexDataBuffer = new Qt3DRender::QBuffer(Qt3DRender::QBuffer::VertexBuffer, customGeometry);
+
+    // vec3 for position
+    // vec3 for colors
+    // vec3 for normals
+
+    /*          2
+               /|\
+              / | \
+             / /3\ \
+             0/___\ 1
+    */
+
+    // 12 distinct vertices formaing 4 triangles
+    QByteArray vertexBufferData;
+    vertexBufferData.resize(4 * 3 * (3 + 3 + 3) * sizeof(float));
+
+    // Vertices
+    QVector3D v0(-1.0f, 0.0f, -1.0f);
+    QVector3D v1(1.0f, 0.0f, -1.0f);
+    QVector3D v2(0.0f, 1.0f, 0.0f);
+    QVector3D v3(0.0f, 0.0f, 1.0f);
+
+    // Faces Normals
+    QVector3D n023 = QVector3D::normal(v0, v2, v3);
+    QVector3D n012 = QVector3D::normal(v0, v1, v2);
+    QVector3D n310 = QVector3D::normal(v3, v1, v0);
+    QVector3D n132 = QVector3D::normal(v1, v3, v2);
+
+    // Vector Normals
+    QVector3D n0 = QVector3D(n023 + n012 + n310).normalized();
+    QVector3D n1 = QVector3D(n132 + n012 + n310).normalized();
+    QVector3D n2 = QVector3D(n132 + n012 + n023).normalized();
+    QVector3D n3 = QVector3D(n132 + n310 + n023).normalized();
+
+    // Colors
+    QVector3D red(1.0f, 0.0f, 0.0f);
+    QVector3D green(0.0f, 1.0f, 0.0f);
+    QVector3D blue(0.0f, 0.0f, 1.0f);
+    QVector3D white(1.0f, 1.0f, 1.0f);
+
+    QVector<QVector3D> vertices = QVector<QVector3D>()
+            << v0 << n0 << red
+            << v1 << n1 << blue
+            << v2 << n2 << green
+
+            << v3 << n3 << white
+            << v1 << n1 << blue
+            << v0 << n0 << red
+
+            << v0 << n0 << red
+            << v2 << n2 << green
+            << v3 << n3 << white
+
+            << v1 << n1 << blue
+            << v3 << n3 << white
+            << v2 << n2 << green;
+
+
+    float *rawVertexArray = reinterpret_cast<float *>(vertexBufferData.data());
+    int idx = 0;
+
+    Q_FOREACH (const QVector3D &v, vertices) {
+        rawVertexArray[idx++] = v.x();
+        rawVertexArray[idx++] = v.y();
+        rawVertexArray[idx++] = v.z();
+    }
+
+    vertexDataBuffer->setData(vertexBufferData);
+
+    // Attributes
+    Qt3DRender::QAttribute *positionAttribute = new Qt3DRender::QAttribute();
+    positionAttribute->setAttributeType(Qt3DRender::QAttribute::VertexAttribute);
+    positionAttribute->setBuffer(vertexDataBuffer);
+    positionAttribute->setDataType(Qt3DRender::QAttribute::Float);
+    positionAttribute->setDataSize(3);
+    positionAttribute->setByteOffset(0);
+    positionAttribute->setByteStride(9 * sizeof(float));
+    positionAttribute->setCount(12);
+    positionAttribute->setName(Qt3DRender::QAttribute::defaultPositionAttributeName());
+
+    Qt3DRender::QAttribute *normalAttribute = new Qt3DRender::QAttribute();
+    normalAttribute->setAttributeType(Qt3DRender::QAttribute::VertexAttribute);
+    normalAttribute->setBuffer(vertexDataBuffer);
+    normalAttribute->setDataType(Qt3DRender::QAttribute::Float);
+    normalAttribute->setDataSize(3);
+    normalAttribute->setByteOffset(3 * sizeof(float));
+    normalAttribute->setByteStride(9 * sizeof(float));
+    normalAttribute->setCount(12);
+    normalAttribute->setName(Qt3DRender::QAttribute::defaultNormalAttributeName());
+
+    Qt3DRender::QAttribute *colorAttribute = new Qt3DRender::QAttribute();
+    colorAttribute->setAttributeType(Qt3DRender::QAttribute::VertexAttribute);
+    colorAttribute->setBuffer(vertexDataBuffer);
+    colorAttribute->setDataType(Qt3DRender::QAttribute::Float);
+    colorAttribute->setDataSize(3);
+    colorAttribute->setByteOffset(6 * sizeof(float));
+    colorAttribute->setByteStride(9 * sizeof(float));
+    colorAttribute->setCount(12);
+    colorAttribute->setName(Qt3DRender::QAttribute::defaultColorAttributeName());
+
+    customGeometry->addAttribute(positionAttribute);
+    customGeometry->addAttribute(normalAttribute);
+    customGeometry->addAttribute(colorAttribute);
+
+    customMeshRenderer->setInstanceCount(1);
+    customMeshRenderer->setBaseVertex(0);
+    customMeshRenderer->setBaseInstance(0);
+    customMeshRenderer->setPrimitiveType(Qt3DRender::QGeometryRenderer::Triangles);
+    customMeshRenderer->setGeometry(customGeometry);
+    // 4 faces of 3 points
+    customMeshRenderer->setPrimitiveCount(12);
+
+    return customMeshRenderer;
+}
+
+class TestAspect : public Qt3DRender::QRenderAspect
+{
+public:
+    TestAspect(Qt3DCore::QNode *root)
+        : Qt3DRender::QRenderAspect()
+    {
+        Qt3DCore::QNodeVisitor visitor;
+        visitor.traverse(root, this, &TestAspect::visitNode);
+    }
+
+    Qt3DRender::Render::NodeManagers *nodeManagers() const
+    {
+        return d_func()->m_renderer->nodeManagers();
+    }
+
+    void visitNode(Qt3DCore::QNode *node)
+    {
+        QAbstractAspect::createBackendNode(node);
+    }
+};
+
+class tst_TrianglesExtractor : public QObject
+{
+    Q_OBJECT
+private Q_SLOTS:
+
+    void triangles_data()
+    {
+        QTest::addColumn<Qt3DRender::QGeometryRenderer *>("geomRenderer");
+        QTest::addColumn<QVector<Qt3DRender::Render::TriangleBoundingVolume *> >("expectedVolumes");
+
+        QVector<Qt3DRender::Render::TriangleBoundingVolume *> v =
+                QVector<Qt3DRender::Render::TriangleBoundingVolume *>()
+                << new Qt3DRender::Render::TriangleBoundingVolume(Qt3DCore::QNodeId(), QVector3D(0, 1, 0), QVector3D(1, 0, -1), QVector3D(-1, 0, -1))
+                << new Qt3DRender::Render::TriangleBoundingVolume(Qt3DCore::QNodeId(), QVector3D(-1, 0, -1), QVector3D(1, 0, -1), QVector3D(0, 0, 1))
+                << new Qt3DRender::Render::TriangleBoundingVolume(Qt3DCore::QNodeId(), QVector3D(0, 0, 1), QVector3D(0, 1, 0), QVector3D(-1, 0, -1))
+                << new Qt3DRender::Render::TriangleBoundingVolume(Qt3DCore::QNodeId(), QVector3D(0, 1, 0), QVector3D(0, 0, 1), QVector3D(1, 0, -1));
+
+        QTest::newRow("indexedMesh") << customIndexedGeometryRenderer() << v;
+        QTest::newRow("nonIndexedMesh") << customNonIndexedGeometryRenderer() << v;
+    }
+
+    void triangles()
+    {
+        // GIVEN
+        QFETCH(Qt3DRender::QGeometryRenderer *, geomRenderer);
+        QFETCH(QVector<Qt3DRender::Render::TriangleBoundingVolume *>, expectedVolumes);
+        TestAspect aspect(geomRenderer);
+        Qt3DRender::Render::NodeManagers *manager = aspect.nodeManagers();
+
+        // WHEN
+        Qt3DRender::Render::GeometryRenderer *bGeomRenderer =
+                manager->lookupResource
+                <Qt3DRender::Render::GeometryRenderer,
+                Qt3DRender::Render::GeometryRendererManager>
+                (geomRenderer->id());
+        // THEN
+        QVERIFY(bGeomRenderer);
+
+        // WHEN
+        Qt3DRender::Render::TrianglesExtractor extractor(bGeomRenderer, manager);
+        QVector<Qt3DCore::QBoundingVolume *> volumes = extractor.extract(Qt3DCore::QNodeId());
+
+        // THEN
+        QVERIFY(!volumes.empty());
+        QCOMPARE(volumes.size(), expectedVolumes.size());
+        for (int i = 0, m = volumes.size(); i < m; ++i) {
+            const Qt3DRender::Render::TriangleBoundingVolume *expectedVolume = expectedVolumes.at(i);
+            const Qt3DRender::Render::TriangleBoundingVolume *actualVolume = static_cast<Qt3DRender::Render::TriangleBoundingVolume *>(volumes.at(i));
+
+            QCOMPARE(expectedVolume->id(), actualVolume->id());
+            QCOMPARE(expectedVolume->a(), actualVolume->a());
+            QCOMPARE(expectedVolume->b(), actualVolume->b());
+            QCOMPARE(expectedVolume->c(), actualVolume->c());
+        }
+    }
+};
+
+
+QTEST_MAIN(tst_TrianglesExtractor)
+
+#include "tst_trianglesextractor.moc"