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/****************************************************************************
**
** Copyright (C) 2015 Jolla Ltd, author: <gunnar.sletta@jollamobile.com>
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt Quick Sceneground Playground.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QSGBASICSHADERMANAGER_P_H
#define QSGBASICSHADERMANAGER_P_H
#include <qsgmaterial.h>
#include <QtGui/qopenglfunctions.h>
#if QT_VERSION >= 0x050800
#include <private/qsgdefaultcontext_p.h>
#include <private/qsgdefaultrendercontext_p.h>
#else
#include <private/qsgcontext_p.h>
#endif
#include <private/qsgrenderer_p.h>
class QSGDefaultRenderContext;
class QSGBasicShaderManager : public QObject
{
Q_OBJECT
public:
QSGBasicShaderManager(QSGRenderContext *context)
: QObject(context)
#if QT_VERSION >= 0x050800
, m_context(static_cast<QSGDefaultRenderContext *>(context))
#else
, m_context(context)
#endif
, m_currentShader(0)
, m_currentMaterial(0)
, m_previousMaterial(0)
, m_currentAttributeCount(0)
{
connect(context, SIGNAL(invalidated()), this, SLOT(invalidate()));
}
static QSGBasicShaderManager *from(QSGRenderContext *context)
{
const QString name = QStringLiteral("qsg_basic_shadermanager");
QSGBasicShaderManager *sm = context->findChild<QSGBasicShaderManager *>(name);
if (!sm) {
sm = new QSGBasicShaderManager(context);
sm->setObjectName(name);
}
return sm;
}
QSGMaterialShader *prepare(const QSGMaterial *material)
{
Q_ASSERT(material);
QSGMaterialType *type = material->type();
QSGMaterialShader *shader = m_shaders.value(type);
if (shader)
return shader;
shader = static_cast<QSGMaterialShader *>(material->createShader());
#if QT_VERSION >= 0x050800
m_context->compileShader(shader, const_cast<QSGMaterial *>(material));
m_context->initializeShader(shader);
#else
m_context->compile(shader, const_cast<QSGMaterial *>(material));
m_context->initialize(shader);
#endif
m_shaders[type] = shader;
return shader;
}
static int countAttributes(QSGMaterialShader *shader)
{
const char * const *names = shader->attributeNames();
Q_ASSERT(names);
int count = 0;
while (names[count])
++count;
return count;
}
void activate(const QSGMaterial *m, QSGMaterialShader::RenderState::DirtyStates states, QSGRenderer *renderer, QOpenGLFunctions *gl)
{
Q_ASSERT(m);
QSGMaterialShader *shader = prepare(m);
Q_ASSERT(shader);
m_previousMaterial = m_currentMaterial;
m_currentMaterial = m;
if (shader != m_currentShader) {
if (m_currentShader)
m_currentShader->deactivate();
m_currentShader = shader;
m_currentShader->program()->bind();
m_currentShader->activate();
m_previousMaterial = 0;
states |=(QSGMaterialShader::RenderState::DirtyOpacity | QSGMaterialShader::RenderState::DirtyMatrix);
setEnabledVertexAttribArrays(countAttributes(m_currentShader), gl);
}
m_currentShader->updateState(renderer->state(states),
const_cast<QSGMaterial *>(m_currentMaterial),
const_cast<QSGMaterial *>(m_previousMaterial));
}
void setEnabledVertexAttribArrays(int howMany, QOpenGLFunctions *gl) {
for (int i=m_currentAttributeCount; i<howMany; ++i)
gl->glEnableVertexAttribArray(i);
for (int i=m_currentAttributeCount-1; i>=howMany; --i)
gl->glDisableVertexAttribArray(i);
m_currentAttributeCount = howMany;
}
void deactivate() {
if (m_currentShader) {
m_currentShader->deactivate();
m_currentShader = 0;
}
m_previousMaterial = 0;
m_currentMaterial = 0;
}
QSGMaterialShader *currentShader() const { return m_currentShader; }
int currentAttributeCount() const { return m_currentAttributeCount; }
void endFrame(QOpenGLFunctions *gl) {
// Reset shader and potential shader state
if (m_currentShader) {
m_currentShader->deactivate();
m_currentShader = 0;
}
m_currentMaterial = 0;
m_previousMaterial = 0;
// Disable all attribute arrays.
while (m_currentAttributeCount > 0)
gl->glDisableVertexAttribArray(--m_currentAttributeCount);
}
public Q_SLOTS:
void invalidate() {
qDeleteAll(m_shaders.values());
m_shaders.clear();
}
private:
QHash<QSGMaterialType *, QSGMaterialShader *> m_shaders;
#if QT_VERSION >= 0x050800
QSGDefaultRenderContext *m_context;
#else
QSGRenderContext *m_context;
#endif
QSGMaterialShader *m_currentShader;
const QSGMaterial *m_currentMaterial;
const QSGMaterial *m_previousMaterial;
int m_currentAttributeCount;
};
#endif
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