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/****************************************************************************
**
** Copyright (C) 2008-2012 NVIDIA Corporation.
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt 3D Studio.
**
** $QT_BEGIN_LICENSE:GPL$
** 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 https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#pragma once
#ifndef QT3DS_RENDER_RENDER_LIST_H
#define QT3DS_RENDER_RENDER_LIST_H
#include "Qt3DSRender.h"
#include "foundation/Qt3DSRefCounted.h"
#include "render/Qt3DSRenderBaseTypes.h"
namespace qt3ds {
namespace render {
class IRenderTask
{
public:
virtual ~IRenderTask() {}
virtual void Run() = 0;
virtual bool persistent() const
{
return false;
}
};
/**
* The render list exists so that dependencies of the main render target can render themselves
* completely before the main render target renders. From Maxwell GPU's on, we have a tiled
* architecture. This tiling mechanism is sensitive to switching the render target, so we would
* really like to render completely to a single render target and then switch. With our layered
* render architecture, this is not very feasible unless dependencies render themselves before
* the
* main set of layers render themselves. Furthermore it benefits the overall software
* architecture
* to have a distinct split between the prepare for render step and the render step and using
* this
* render list allows us to avoid some level of repeated tree traversal at the cost of some
* minimal
* per frame allocation. The rules for using the render list are that you need to add yourself
* before
* your dependencies do; the list is iterated in reverse during RunRenderTasks. So a layer adds
* itself
* (if it is going to render offscreen) before it runs through its renderable list to prepare
* each object
* because it is during the renderable prepare traversale that subpresentations will get added
* by
* the offscreen render manager.
*/
class IRenderList : public NVRefCounted
{
public:
// Called by the render context, do not call this.
virtual void BeginFrame() = 0;
// Next tell all sub render target rendering systems to add themselves to the render list.
// At this point
// we agree to *not* have rendered anything, no clears or anything so if you are caching
// render state and you detect nothing has changed it may not be necessary to swap egl
// buffers.
virtual QT3DSU32 AddRenderTask(IRenderTask &inTask) = 0;
virtual void DiscardRenderTask(QT3DSU32 inTaskId) = 0;
// This runs through the added tasks in reverse order. This is used to render dependencies
// before rendering to the main render target.
virtual void RunRenderTasks() = 0;
// We used to use GL state to pass information down the callstack.
// I have replaced those calls with this state here because that information
// controls how layers size themselves (which is quite a complicated process).
virtual void SetScissorTestEnabled(bool enabled) = 0;
virtual void SetScissorRect(NVRenderRect rect) = 0;
virtual void SetViewport(NVRenderRect rect) = 0;
virtual bool IsScissorTestEnabled() const = 0;
virtual NVRenderRect GetScissor() const = 0;
virtual NVRenderRect GetViewport() const = 0;
static IRenderList &CreateRenderList(NVFoundationBase &inFnd);
};
// Now for scoped property access.
template <typename TDataType>
struct SRenderListScopedProperty
: public qt3ds::render::NVRenderGenericScopedProperty<IRenderList, TDataType>
{
typedef qt3ds::render::NVRenderGenericScopedProperty<IRenderList, TDataType> TBaseType;
typedef typename TBaseType::TGetter TGetter;
typedef typename TBaseType::TSetter TSetter;
SRenderListScopedProperty(IRenderList &ctx, TGetter getter, TSetter setter)
: TBaseType(ctx, getter, setter)
{
}
SRenderListScopedProperty(IRenderList &ctx, TGetter getter, TSetter setter,
const TDataType &inNewValue)
: TBaseType(ctx, getter, setter, inNewValue)
{
}
};
}
}
#endif
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