Add QCuboidMesh and use it in rollerball as the walls

Change-Id: If2b83a7f949464760a7e98381eccc5f2f57491a5
Reviewed-by: Paul Lemire <paul.lemire@kdab.com>

1 files changed, 501 insertions, 0 deletions

diff --git a/src/render/frontend/qcuboidmesh.cpp b/src/render/frontend/qcuboidmesh.cpp
new file mode 100644
index 000000000..5577cc314
--- /dev/null
+++ b/src/render/frontend/qcuboidmesh.cpp
@@ -0,0 +1,501 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt3D module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qcuboidmesh.h"
+#include "qcuboidmesh_p.h"
+
+#include <Qt3DRenderer/renderlogging.h>
+#include <Qt3DRenderer/qattribute.h>
+#include <Qt3DRenderer/qbuffer.h>
+#include <Qt3DRenderer/meshdata.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace Qt3D {
+
+QCuboidMeshPrivate::QCuboidMeshPrivate(QCuboidMesh *qq)
+    : QAbstractShapeMeshPrivate(qq)
+    , m_xExtent(1.0)
+    , m_yExtent(1.0)
+    , m_zExtent(1.0)
+    , m_yzFaceResolution(2, 2)
+    , m_xzFaceResolution(2, 2)
+    , m_xyFaceResolution(2, 2)
+{
+}
+
+QCuboidMesh::QCuboidMesh(QNode *parent)
+    : QAbstractShapeMesh(*new QCuboidMeshPrivate(this), parent)
+{
+    setDirty(true);
+}
+
+QCuboidMesh::QCuboidMesh(QCuboidMeshPrivate &dd, QNode *parent)
+    : QAbstractShapeMesh(dd, parent)
+{
+    setDirty(true);
+}
+
+void QCuboidMesh::setXExtent(float xExtent)
+{
+    Q_D(QCuboidMesh);
+    if (d->m_xExtent != xExtent) {
+        d->m_xExtent = xExtent;
+        emit xExtentChanged();
+        setDirty(true);
+    }
+}
+
+float QCuboidMesh::xExtent() const
+{
+    Q_D(const QCuboidMesh);
+    return d->m_xExtent;
+}
+
+void QCuboidMesh::setYExtent(float yExtent)
+{
+    Q_D(QCuboidMesh);
+    if (d->m_yExtent != yExtent) {
+        d->m_yExtent = yExtent;
+        emit yExtentChanged();
+        setDirty(true);
+    }
+}
+
+float QCuboidMesh::yExtent() const
+{
+    Q_D(const QCuboidMesh);
+    return d->m_yExtent;
+}
+
+void QCuboidMesh::setZExtent(float zExtent)
+{
+    Q_D(QCuboidMesh);
+    if (d->m_zExtent != zExtent) {
+        d->m_zExtent = zExtent;
+        emit zExtentChanged();
+        setDirty(true);
+    }
+}
+
+float QCuboidMesh::zExtent() const
+{
+    Q_D(const QCuboidMesh);
+    return d->m_zExtent;
+}
+
+void QCuboidMesh::setYZMeshResolution(const QSize &resolution)
+{
+    Q_D(QCuboidMesh);
+    if (d->m_yzFaceResolution != resolution) {
+        d->m_yzFaceResolution = resolution;
+        emit yzMeshResolutionChanged();
+        setDirty(true);
+    }
+}
+
+QSize QCuboidMesh::yzMeshResolution() const
+{
+    Q_D(const QCuboidMesh);
+    return d->m_yzFaceResolution;
+}
+
+void QCuboidMesh::setXZMeshResolution(const QSize &resolution)
+{
+    Q_D(QCuboidMesh);
+    if (d->m_xzFaceResolution != resolution) {
+        d->m_xzFaceResolution = resolution;
+        emit xzMeshResolutionChanged();
+        setDirty(true);
+    }
+}
+
+QSize QCuboidMesh::xzMeshResolution() const
+{
+    Q_D(const QCuboidMesh);
+    return d->m_xzFaceResolution;
+}
+
+void QCuboidMesh::setXYMeshResolution(const QSize &resolution)
+{
+    Q_D(QCuboidMesh);
+    if (d->m_xyFaceResolution != resolution) {
+        d->m_xyFaceResolution = resolution;
+        emit xyMeshResolutionChanged();
+        setDirty(true);
+    }
+}
+
+QSize QCuboidMesh::xyMeshResolution() const
+{
+    Q_D(const QCuboidMesh);
+    return d->m_xyFaceResolution;
+}
+
+MeshDataPtr createCuboidMesh(float xExtent,
+                             float yExtent,
+                             float zExtent,
+                             const QSize &yzResolution,
+                             const QSize &xzResolution,
+                             const QSize &xyResolution);
+
+class CuboidMeshFunctor : public QAbstractMeshFunctor
+{
+public:
+    CuboidMeshFunctor(const QCuboidMesh &c)
+        : QAbstractMeshFunctor()
+        , m_xExtent(c.xExtent())
+        , m_yExtent(c.yExtent())
+        , m_zExtent(c.zExtent())
+        , m_yzFaceResolution(c.yzMeshResolution())
+        , m_xzFaceResolution(c.xzMeshResolution())
+        , m_xyFaceResolution(c.xyMeshResolution())
+    {
+    }
+
+    QAbstractMeshDataPtr operator ()() Q_DECL_OVERRIDE
+    {
+        return createCuboidMesh(m_xExtent, m_yExtent, m_zExtent,
+                                m_yzFaceResolution,
+                                m_xzFaceResolution,
+                                m_xyFaceResolution);
+    }
+
+private:
+    // Dimensions
+    float m_xExtent;
+    float m_yExtent;
+    float m_zExtent;
+
+    // Resolutions of faces with normal x, y, and z
+    QSize m_yzFaceResolution;
+    QSize m_xzFaceResolution;
+    QSize m_xyFaceResolution;
+};
+
+QAbstractMeshFunctorPtr QCuboidMesh::meshFunctor() const
+{
+    return QAbstractMeshFunctorPtr(new CuboidMeshFunctor(*this));
+}
+
+enum PlaneNormal {
+    PositiveX,
+    NegativeX,
+    PositiveY,
+    NegativeY,
+    PositiveZ,
+    NegativeZ
+};
+
+void generatePlaneData(float w, float h, const QSize &resolution,
+                       PlaneNormal normal, float planeDistance,
+                       float *vertices, quint16 *indices,
+                       quint16 &baseVertex)
+{
+    const float a0 = -w / 2.0f;
+    const float b0 = -h / 2.0f;
+    const float da = w / (resolution.width() - 1);
+    const float db = h / (resolution.height() - 1);
+    const float du = 1.0 / (resolution.width() - 1);
+    const float dv = 1.0 / (resolution.height() - 1);
+    float n = 1.0f;
+
+    switch (normal) {
+    case NegativeX:
+        n = -1.0f; // fall through
+    case PositiveX: {
+        // Iterate over z
+        for (int j = 0; j < resolution.height(); ++j) {
+            const float b = b0 + static_cast<float>(j) * db;
+            const float v = static_cast<float>(j) * dv;
+
+            // Iterate over y
+            for (int i = 0; i < resolution.width(); ++i) {
+                const float a = a0 + static_cast<float>(i) * da;
+                const float u = static_cast<float>(i) * du;
+
+                // position
+                *vertices++ = planeDistance;
+                *vertices++ = a;
+                *vertices++ = b;
+
+                // texture coordinates
+                *vertices++ = u;
+                *vertices++ = v;
+
+                // normal
+                *vertices++ = n;
+                *vertices++ = 0.0f;
+                *vertices++ = 0.0f;
+
+                // tangent
+                *vertices++ = 0.0f;
+                *vertices++ = 0.0f;
+                *vertices++ = 1.0f;
+                *vertices++ = 1.0f;
+            }
+        }
+        break;
+    }
+
+    case NegativeY:
+        n = -1.0f;
+    case PositiveY: {
+        // Iterate over z
+        for (int j = 0; j < resolution.height(); ++j) {
+            const float b = b0 + static_cast<float>(j) * db;
+            const float v = static_cast<float>(j) * dv;
+
+            // Iterate over x
+            // This iterates in the opposite sense to the other directions
+            // so that the winding order is correct
+            for (int i = resolution.width() - 1; i >= 0; --i) {
+                const float a = a0 + static_cast<float>(i) * da;
+                const float u = static_cast<float>(i) * du;
+
+                // position
+                *vertices++ = a;
+                *vertices++ = planeDistance;
+                *vertices++ = b;
+
+                // texture coordinates
+                *vertices++ = u;
+                *vertices++ = v;
+
+                // normal
+                *vertices++ = 0.0f;
+                *vertices++ = n;
+                *vertices++ = 0.0f;
+
+                // tangent
+                *vertices++ = 1.0f;
+                *vertices++ = 0.0f;
+                *vertices++ = 0.0f;
+                *vertices++ = 1.0f;
+            }
+        }
+        break;
+    }
+
+    case NegativeZ:
+        n = -1.0f;
+    case PositiveZ: {
+        // Iterate over y
+        for (int j = 0; j < resolution.height(); ++j) {
+            const float b = b0 + static_cast<float>(j) * db;
+            const float v = static_cast<float>(j) * dv;
+
+            // Iterate over x
+            for (int i = 0; i < resolution.width(); ++i) {
+                const float a = a0 + static_cast<float>(i) * da;
+                const float u = static_cast<float>(i) * du;
+
+                // position
+                *vertices++ = a;
+                *vertices++ = b;
+                *vertices++ = planeDistance;
+
+                // texture coordinates
+                *vertices++ = u;
+                *vertices++ = v;
+
+                // normal
+                *vertices++ = 0.0f;
+                *vertices++ = 0.0f;
+                *vertices++ = n;
+
+                // tangent
+                *vertices++ = 1.0f;
+                *vertices++ = 0.0f;
+                *vertices++ = 0.0f;
+                *vertices++ = 1.0f;
+            }
+        }
+        break;
+    }
+    } // switch (normal)
+
+    // Populate indices taking care to get correct CCW winding on all faces
+    if (n > 0.0) {
+        for (int j = 0; j < resolution.height() - 1; ++j) {
+            const int rowStartIndex = j * resolution.width() + baseVertex;
+            const int nextRowStartIndex = (j + 1) * resolution.width() + baseVertex;
+
+            // Iterate over x
+            for (int i = 0; i < resolution.width() - 1; ++i) {
+                // Split quad into two triangles
+                *indices++ = rowStartIndex + i;
+                *indices++ = rowStartIndex + i + 1;
+                *indices++ = nextRowStartIndex + i;
+
+                *indices++ = nextRowStartIndex + i;
+                *indices++ = rowStartIndex + i + 1;
+                *indices++ = nextRowStartIndex + i + 1;
+            }
+        }
+    } else {
+        for (int j = 0; j < resolution.height() - 1; ++j) {
+            const int rowStartIndex = j * resolution.width() + baseVertex;
+            const int nextRowStartIndex = (j + 1) * resolution.width() + baseVertex;
+
+            // Iterate over x
+            for (int i = 0; i < resolution.width() - 1; ++i) {
+                // Split quad into two triangles
+                *indices++ = rowStartIndex + i;
+                *indices++ = nextRowStartIndex + i;
+                *indices++ = rowStartIndex + i + 1;
+
+                *indices++ = nextRowStartIndex + i;
+                *indices++ = nextRowStartIndex + i + 1;
+                *indices++ = rowStartIndex + i + 1;
+            }
+        }
+    }
+
+    baseVertex += resolution.width() * resolution.height();
+}
+
+MeshDataPtr createCuboidMesh(float xExtent,
+                             float yExtent,
+                             float zExtent,
+                             const QSize &yzResolution,
+                             const QSize &xzResolution,
+                             const QSize &xyResolution)
+{
+    Q_ASSERT(xExtent > 0.0f && yExtent > 0.0f && zExtent > 0.0);
+    Q_ASSERT(yzResolution.width() >= 2 && yzResolution.height() >=2);
+    Q_ASSERT(xzResolution.width() >= 2 && xzResolution.height() >=2);
+    Q_ASSERT(xyResolution.width() >= 2 && xyResolution.height() >=2);
+
+    const int yzVerts = yzResolution.width() * yzResolution.height();
+    const int xzVerts = xzResolution.width() * xzResolution.height();
+    const int xyVerts = xyResolution.width() * xyResolution.height();
+    const int nVerts = 2 * (yzVerts + xzVerts + xyVerts);
+
+    // Allocate a buffer with the interleaved per-vertex data with
+    // vec3 pos, vec2 texCoord, vec3 normal, vec4 tangent
+    const quint32 elementSize = 3 + 2 + 3 + 4;
+    const quint32 stride = elementSize * sizeof(float);
+    QByteArray vertexBytes;
+    vertexBytes.resize(stride * nVerts);
+    float* vertices = reinterpret_cast<float*>(vertexBytes.data());
+
+    // Allocate a buffer for the index data
+    const int yzIndices = 2 * 3 * (yzResolution.width() - 1) * (yzResolution.height() - 1);
+    const int xzIndices = 2 * 3 * (xzResolution.width() - 1) * (xzResolution.height() - 1);
+    const int xyIndices = 2 * 3 * (xyResolution.width() - 1) * (xyResolution.height() - 1);
+    const int indexCount = 2 * (yzIndices + xzIndices + xyIndices);
+    Q_ASSERT(indexCount < std::numeric_limits<quint16>::max());
+    QByteArray indexBytes;
+    indexBytes.resize(indexCount * sizeof(quint16));
+    quint16* indices = reinterpret_cast<quint16*>(indexBytes.data());
+
+    // Populate vertex and index buffers
+    quint16 baseVertex = 0;
+    generatePlaneData(yExtent, zExtent, yzResolution,
+                      PositiveX, xExtent / 2.0f,
+                      vertices, indices, baseVertex);
+
+    vertices += yzVerts * elementSize;
+    indices += yzIndices;
+    generatePlaneData(yExtent, zExtent, yzResolution,
+                      NegativeX, -xExtent / 2.0f,
+                      vertices, indices, baseVertex);
+    vertices += yzVerts * elementSize;
+    indices += yzIndices;
+
+    generatePlaneData(xExtent, zExtent, xzResolution,
+                      PositiveY, yExtent / 2.0f,
+                      vertices, indices, baseVertex);
+    vertices += xzVerts * elementSize;
+    indices += xzIndices;
+    generatePlaneData(xExtent, zExtent, xzResolution,
+                      NegativeY, -yExtent / 2.0f,
+                      vertices, indices, baseVertex);
+    vertices += xzVerts * elementSize;
+    indices += xzIndices;
+
+    generatePlaneData(xExtent, yExtent, xyResolution,
+                      PositiveZ, zExtent / 2.0f,
+                      vertices, indices, baseVertex);
+    vertices += xyVerts * elementSize;
+    indices += xyIndices;
+    generatePlaneData(xExtent, yExtent, xyResolution,
+                      NegativeZ, -zExtent / 2.0f,
+                      vertices, indices, baseVertex);
+
+    // Wrap the raw bytes in buffers and set attributes/indices on the mesh
+    BufferPtr vertexBuffer(new Buffer(QOpenGLBuffer::VertexBuffer));
+    vertexBuffer->setUsage(QOpenGLBuffer::StaticDraw);
+    vertexBuffer->setData(vertexBytes);
+
+    BufferPtr indexBuffer(new Buffer(QOpenGLBuffer::IndexBuffer));
+    indexBuffer->setUsage(QOpenGLBuffer::StaticDraw);
+    indexBuffer->setData(indexBytes);
+
+    MeshDataPtr mesh(new MeshData(GL_TRIANGLES));
+    quint32 offset = 0;
+    mesh->addAttribute(QAbstractMeshData::defaultPositionAttributeName(),
+                       AttributePtr(new Attribute(vertexBuffer, GL_FLOAT_VEC3, nVerts, offset, stride)));
+    offset += 3 * sizeof(float);
+
+    mesh->addAttribute(QAbstractMeshData::defaultTextureCoordinateAttributeName(),
+                       AttributePtr(new Attribute(vertexBuffer, GL_FLOAT_VEC2, nVerts, offset, stride)));
+    offset += 2 * sizeof(float);
+
+    mesh->addAttribute(QAbstractMeshData::defaultNormalAttributeName(),
+                       AttributePtr(new Attribute(vertexBuffer, GL_FLOAT_VEC3, nVerts, offset, stride)));
+    offset += 3 * sizeof(float);
+
+    mesh->addAttribute(QAbstractMeshData::defaultTangentAttributeName(),
+                       AttributePtr(new Attribute(vertexBuffer, GL_FLOAT_VEC4, nVerts, offset, stride)));
+
+    mesh->setIndexAttribute(AttributePtr(new Attribute(indexBuffer, GL_UNSIGNED_SHORT, indexCount, 0, 0)));
+
+    mesh->computeBoundsFromAttribute(QAbstractMeshData::defaultPositionAttributeName());
+    qCDebug(Render::Frontend) << "computed axis-aligned bounding box is:" << mesh->boundingBox();
+
+    return mesh;
+}
+
+} // namespace Qt3D
+
+QT_END_NAMESPACE