Added QSGRenderNode class.

Change-Id: I8c903cae490158b864af60f53c10c10f2faea7c0
Reviewed-by: Gunnar Sletta <gunnar.sletta@nokia.com>

1 files changed, 122 insertions, 0 deletions

diff --git a/src/quick/scenegraph/coreapi/qsgrendernode.cpp b/src/quick/scenegraph/coreapi/qsgrendernode.cpp
new file mode 100644
index 0000000000..0697fbe630
--- /dev/null
+++ b/src/quick/scenegraph/coreapi/qsgrendernode.cpp
@@ -0,0 +1,122 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the QtDeclarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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, Nokia gives you certain additional
+** rights. These rights are described in the Nokia 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.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qsgrendernode_p.h"
+
+QT_BEGIN_NAMESPACE
+
+QSGRenderNode::QSGRenderNode()
+    : QSGNode(RenderNodeType)
+    , m_matrix(0)
+    , m_clip_list(0)
+    , m_opacity(1)
+{
+}
+
+void QSGRenderNode::setInheritedOpacity(qreal opacity)
+{
+    Q_ASSERT(opacity >= 0 && opacity <= 1);
+    m_opacity = opacity;
+}
+
+/*!
+    \fn QSGRenderNode::StateFlags QSGRenderNode::changedStates()
+
+    This function should return a mask where each bit represents OpenGL states changed by
+    the \l render() function:
+    \list
+    \o DepthState - depth write mask, depth test enabled, depth comparison function
+    \o StencilState - stencil write masks, stencil test enabled, stencil operations,
+                      stencil comparison functions
+    \o ScissorState - scissor enabled, scissor test enabled
+    \o ColorState - clear color, color write mask
+    \o BlendState - blend enabled, blend function
+    \o CullState - front face, cull face enabled
+    \o ViewportState - viewport
+    \endlist
+
+    The function is called by the renderer so it can reset the OpenGL states after rendering this
+    node.
+
+    \internal
+  */
+
+/*!
+    \fn void QSGRenderNode::render(const RenderState &state)
+
+    This function is called by the renderer and should paint this node with OpenGL commands.
+
+    The states necessary for clipping has already been set before the function is called.
+    The clip is a combination of a stencil clip and scissor clip. Information about the clip is
+    found in \a state.
+
+    The effective opacity can be retrieved with \l inheritedOpacity().
+
+    The projection matrix is available through \a state, while the model-view matrix can be
+    fetched with \l matrix(). The combined matrix is then the projection matrix times the
+    model-view matrix.
+
+    The following states are set before this function is called:
+    \list
+    \o glDepthMask(false)
+    \o glDisable(GL_DEPTH_TEST)
+    \o glStencilMask(0)
+    \o glEnable(GL_STENCIL_TEST)/glDisable(GL_STENCIL_TEST) depending on clip
+    \o glStencilFunc(GL_EQUAL, state.stencilValue, 0xff) depending on clip
+    \o glEnable(GL_SCISSOR_TEST)/glDisable(GL_SCISSOR_TEST) depending on clip
+    \o glScissor(state.scissorRect.x(), state.scissorRect.y(),
+                 state.scissorRect.width(), state.scissorRect.height()) depending on clip
+    \o glEnable(GL_BLEND)
+    \o glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA)
+    \o glDisable(GL_CULL_FACE)
+    \endlist
+
+    States that are not listed above, but are included in \l StateFlags, can have arbitrary
+    values.
+
+    \l changedStates() should return which states this function has changed. If a state is not
+    covered by \l StateFlags, the state should be set to the default value according to the
+    OpenGL specification.
+
+    \internal
+  */
+
+QT_END_NAMESPACE