Added QPointSize RenderState

Point Sizes may be specified 2 ways: either statically via
glPointSize() (OpenGL 2.0+) or by enabling GL_PROGRAM_POINT_SIZE.

Task-number: QTBUG-49997
Change-Id: I98887484cf31df01b98801e1f324487ee7bf7492
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

1 files changed, 124 insertions, 0 deletions

diff --git a/src/render/renderstates/qpointsize.cpp b/src/render/renderstates/qpointsize.cpp
new file mode 100644
index 000000000..69bb8c8e6
--- /dev/null
+++ b/src/render/renderstates/qpointsize.cpp
@@ -0,0 +1,124 @@
+/****************************************************************************
+**
+** 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 "qpointsize.h"
+#include "qrenderstate_p.h"
+
+QT_BEGIN_NAMESPACE
+
+namespace Qt3DRender {
+
+class QPointSizePrivate : public QRenderStatePrivate
+{
+public:
+    QPointSizePrivate(QPointSize::Specification spec, float value)
+        : QRenderStatePrivate(QRenderState::PointSize)
+        , m_specification(spec)
+        , m_value(value)
+    {}
+
+    QPointSize::Specification m_specification;
+    float m_value;
+
+    Q_DECLARE_PUBLIC(QPointSize)
+};
+
+/*!
+    \class Qt3DRender::QPointSize
+    \inmodule Qt3DRender
+    \brief Specifies the size of rasterized points. May either be set statically
+    or by shader programs.
+
+    When using StaticValue, the value is set using glPointSize(), if available.
+    When using Programmable, gl_PointSize must be set within shader programs,
+    the value provided to this RenderState is ignored in that case.
+ */
+
+QPointSize::QPointSize(Qt3DCore::QNode *parent)
+    : QRenderState(*new QPointSizePrivate(Specification::Programmable, 0.f), parent)
+{
+}
+
+QPointSize::~QPointSize()
+{
+    QNode::cleanup();
+}
+
+QPointSize::Specification QPointSize::specification() const
+{
+    Q_D(const QPointSize);
+    return d->m_specification;
+}
+
+float QPointSize::value() const
+{
+    Q_D(const QPointSize);
+    return d->m_value;
+}
+
+bool QPointSize::isProgrammable() const
+{
+    return (specification() == QPointSize::Specification::Programmable);
+}
+
+void QPointSize::setSpecification(Specification spec)
+{
+    Q_D(QPointSize);
+    d->m_specification = spec;
+    emit specificationChanged(spec);
+}
+
+void QPointSize::setValue(float size)
+{
+    Q_D(QPointSize);
+    d->m_value = size;
+    emit valueChanged(size);
+}
+
+void QPointSize::copy(const Qt3DCore::QNode *ref)
+{
+    const QPointSize *refState = static_cast<const QPointSize *>(ref);
+
+    QRenderState::copy(ref);
+
+    Q_D(QPointSize);
+    d->m_value = refState->d_func()->m_value;
+    d->m_specification = refState->d_func()->m_specification;
+}
+
+} // namespace Qt3DRender
+
+QT_END_NAMESPACE
+