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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
#include "Qt3DSRender.h"
#include "foundation/Qt3DSVec2.h"
#include "render/Qt3DSRenderBaseTypes.h"
#include "Qt3DSRenderCamera.h"
#include "Qt3DSRenderContextCore.h"
namespace qt3ds {
namespace render {
/** An independent, testable entity to encapsulate taking at least:
* layer, current viewport rect, current scissor rect, presentation design dimensions
* and producing a set of rectangles:
* layer viewport rect (inside viewport rect and calculated using outer viewport rect info)
* layer scissor rect (inside current scissor rect)
* layer camera rect (may be the viewport rect)
*
* In the case where we have to render offscreen for this layer then we need to handle produce
* a set of texture dimensions and the layer camera rect ends up being same size but with no
*offsets.
*
* This object should handle part of any translation from screenspace to global space.
* I am using language level access control on this object because it needs specific
* interface design that will enable future modifications.
*/
struct SLayerRenderHelper
{
private:
NVRenderRectF m_PresentationViewport;
NVRenderRectF m_PresentationScissor;
QT3DSVec2 m_PresentationDesignDimensions;
SLayer *m_Layer;
SCamera *m_Camera;
bool m_Offscreen;
NVRenderRectF m_Viewport;
NVRenderRectF m_Scissor;
ScaleModes::Enum m_ScaleMode;
QT3DSVec2 m_ScaleFactor;
public:
SLayerRenderHelper();
SLayerRenderHelper(const NVRenderRectF &inPresentationViewport,
const NVRenderRectF &inPresentationScissor,
const QT3DSVec2 &inPresentationDesignDimensions, SLayer &inLayer,
bool inOffscreen, qt3ds::render::ScaleModes::Enum inScaleMode,
qt3ds::QT3DSVec2 inScaleFactor);
NVRenderRectF GetPresentationViewport() const { return m_PresentationViewport; }
NVRenderRectF GetPresentationScissor() const { return m_PresentationScissor; }
QT3DSVec2 GetPresentationDesignDimensions() const { return m_PresentationDesignDimensions; }
SLayer *GetLayer() const { return m_Layer; }
SCamera *GetCamera() const { return m_Camera; }
bool IsOffscreen() const { return m_Offscreen; }
// Does not differ whether offscreen or not, simply states how this layer maps to the
// presentation
NVRenderRectF GetLayerToPresentationViewport() const { return m_Viewport; }
// Does not differ whether offscreen or not, scissor rect of how this layer maps to
// presentation.
NVRenderRectF GetLayerToPresentationScissorRect() const { return m_Scissor; }
QSize GetTextureDimensions() const;
SCameraGlobalCalculationResult SetupCameraForRender(SCamera &inCamera);
Option<QT3DSVec2> GetLayerMouseCoords(const QT3DSVec2 &inMouseCoords,
const QT3DSVec2 &inWindowDimensions,
bool inForceIntersect) const;
Option<SRay> GetPickRay(const QT3DSVec2 &inMouseCoords, const QT3DSVec2 &inWindowDimensions,
bool inForceIntersect) const;
// Checks the various viewports and determines if the layer is visible or not.
bool IsLayerVisible() const;
private:
// Viewport used when actually rendering. In the case where this is an offscreen item then
// it may be
// different than the layer to presentation viewport.
NVRenderRectF GetLayerRenderViewport() const;
};
}
}
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