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  **
  ** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
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  ****************************************************************************/
  
  #ifndef QSGRENDERNODE_P_H
  #define QSGRENDERNODE_P_H
  
  //
  //  W A R N I N G
  //  -------------
  //
  // This file is not part of the Qt API.  It exists purely as an
  // implementation detail.  This header file may change from version to
  // version without notice, or even be removed.
  //
  // We mean it.
  //
  
  #include "qsgnode.h"
  #include <private/qtquickglobal_p.h>
  
  QT_BEGIN_NAMESPACE
  
  namespace QSGBatchRenderer {
      class Renderer;
  }
  
  class Q_QUICK_PRIVATE_EXPORT QSGRenderNode : public QSGNode
  {
  public:
      enum StateFlag
      {
          DepthState = 0x01, // depth mask, depth test enable, depth func, clear depth
          StencilState = 0x02, // stencil mask, stencil test enable, stencil op, stencil func, clear stencil
          ScissorState = 0x04, // scissor enable, scissor test enable
          ColorState = 0x08, // clear color, color mask
          BlendState = 0x10, // blend enable, blend func
          CullState = 0x20, // front face, cull face enable
          ViewportState = 0x40 // viewport
      };
      Q_DECLARE_FLAGS(StateFlags, StateFlag)
  
      struct RenderState
      {
          // The model-view matrix can be retrieved with matrix().
          // The opacity can be retrieved with inheritedOpacity().
          const QMatrix4x4 *projectionMatrix;
          QRect scissorRect;
          int stencilValue;
  
          bool stencilEnabled;
          bool scissorEnabled;
      };
  
      QSGRenderNode();
  
      virtual StateFlags changedStates() = 0;
      virtual void render(const RenderState &state) = 0;
  
      const QMatrix4x4 *matrix() const { return m_matrix; }
      const QSGClipNode *clipList() const { return m_clip_list; }
  
      void setInheritedOpacity(qreal opacity);
      qreal inheritedOpacity() const { return m_opacity; }
  
  private:
      friend class QSGNodeUpdater;
      friend class QSGBatchRenderer::Renderer;
  
      const QMatrix4x4 *m_matrix;
      const QSGClipNode *m_clip_list;
      qreal m_opacity;
  };
  
  Q_DECLARE_OPERATORS_FOR_FLAGS(QSGRenderNode::StateFlags)
  
  QT_END_NAMESPACE
  
  #endif
  