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/****************************************************************************
**
** 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.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QGRAPHICSCONTEXT_H
#define QGRAPHICSCONTEXT_H
#include <QOpenGLContext>
#include <QOpenGLBuffer>
#include <QOpenGLVertexArrayObject>
#include <QHash>
#include <QMatrix4x4>
#include <QBitArray>
#include <rendercamera.h>
#include <meshdata.h>
class QOpenGLShaderProgram;
class QOpenGLFunctions_3_3_Core;
namespace Qt3D
{
class RenderShader;
class RenderCamera;
class RenderMaterial;
class RenderTexture;
class DrawStateSet;
enum TextureScope
{
TextureScopeMaterial = 0,
TextureScopeTechnique
// per-pass for deferred rendering?
};
class QGraphicsContext
{
public:
QGraphicsContext();
~QGraphicsContext();
void setSurface(QSurface* s);
int id() const; // unique, small integer ID of this context
void beginDrawing();
void endDrawing();
void setCamera(RenderCamera* rcam);
RenderCamera* camera() const;
QMatrix4x4 projectionMatrix() const;
QMatrix4x4 viewMatrix() const;
/**
* @brief releaseGL - release all OpenGL objects associated with
* this context
*/
void releaseOpenGL();
void setOpenGLContext(QOpenGLContext* ctx);
QOpenGLContext *openGLContext() { return m_gl; }
void activateShader(RenderShader* shader);
RenderMaterial* activeMaterial() const
{ return m_material; }
void setActiveMaterial(RenderMaterial* rmat);
/**
* @brief activeShader
* @return
*/
QOpenGLShaderProgram* activeShader();
void specifyAttribute(QString nm, AttributePtr attr);
void specifyIndices(AttributePtr attr);
/**
* @brief glBufferFor - given a client-side (CPU) buffer, provide the
* context-specific object. Initial call will create the buffer.
* @param buf
* @return
*/
QOpenGLBuffer glBufferFor(BufferPtr buf);
void setModelMatrix(const QMatrix4x4 &modelMat);
/**
* @brief activateTexture - make a texture active on a hardware unit
* @param tex - the texture to activate
* @param onUnit - option, specify the explicit unit to activate on
* @return - the unit the texture was activated on
*/
int activateTexture(TextureScope scope, RenderTexture* tex, int onUnit = -1);
void deactivateTexture(RenderTexture *tex);
void setCurrentStateSet(DrawStateSet* ss);
DrawStateSet* currentStateSet() const;
private:
void initialize();
void decayTextureScores();
GLint assignUnitForTexture(RenderTexture* tex);
void deactivateTexturesWithScope(TextureScope ts);
bool m_initialized;
const unsigned int m_id;
QOpenGLContext* m_gl;
QSurface* m_surface;
QOpenGLFunctions_3_3_Core *m_funcs;
RenderShader* m_activeShader;
QHash<RenderShader*, QOpenGLShaderProgram*> m_shaderHash;
QHash<BufferPtr,QOpenGLBuffer> m_bufferHash;
// active textures, indexed by texture unit
QVector<RenderTexture*> m_activeTextures;
QBitArray m_pinnedTextureUnits;
QVector<TextureScope> m_textureScopes;
// recency score for all render-textures we've seen. Higher scores
// mean more recently used.
QHash<RenderTexture*, int> m_textureScores;
RenderCamera* m_camera;
RenderMaterial* m_material;
DrawStateSet* m_stateSet;
};
}
#endif // QGRAPHICSCONTEXT_H
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