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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_CAMERA_H
#define QT3DS_RENDER_CAMERA_H
#include "Qt3DSRenderNode.h"
#include "Qt3DSRenderRay.h"
namespace qt3ds {
namespace render {
struct SCameraGlobalCalculationResult
{
bool m_WasDirty;
bool m_ComputeFrustumSucceeded;
SCameraGlobalCalculationResult(bool inWasDirty, bool inComputeSucceeded = true)
: m_WasDirty(inWasDirty)
, m_ComputeFrustumSucceeded(inComputeSucceeded)
{
}
};
struct CameraScaleModes
{
enum Enum {
Fit = 0,
SameSize,
FitHorizontal,
FitVertical,
};
};
struct CameraScaleAnchors
{
enum Enum {
Center = 0,
North,
NorthEast,
East,
SouthEast,
South,
SouthWest,
West,
NorthWest,
};
};
struct SCuboidRect
{
QT3DSF32 m_Left;
QT3DSF32 m_Top;
QT3DSF32 m_Right;
QT3DSF32 m_Bottom;
SCuboidRect(QT3DSF32 l = 0.0f, QT3DSF32 t = 0.0f, QT3DSF32 r = 0.0f, QT3DSF32 b = 0.0f)
: m_Left(l)
, m_Top(t)
, m_Right(r)
, m_Bottom(b)
{
}
void Translate(QT3DSVec2 inTranslation)
{
m_Left += inTranslation.x;
m_Right += inTranslation.x;
m_Top += inTranslation.y;
m_Bottom += inTranslation.y;
}
};
struct SCamera : public SNode
{
// Setting these variables should set dirty on the camera.
QT3DSF32 m_ClipNear;
QT3DSF32 m_ClipFar;
QT3DSF32 m_FOV; // Radians
bool m_FOVHorizontal;
QT3DSMat44 m_Projection;
CameraScaleModes::Enum m_ScaleMode;
CameraScaleAnchors::Enum m_ScaleAnchor;
// Record some values from creating the projection matrix
// to use during mouse picking.
QT3DSVec2 m_FrustumScale;
bool m_EnableFrustumCulling;
SCamera();
QT3DSMat33 GetLookAtMatrix(const QT3DSVec3 &inUpDir, const QT3DSVec3 &inDirection) const;
// Set our position, rotation member variables based on the lookat target
// Marks this object as dirty.
// Need to test this when the camera's local transform is null.
// Assumes parent's local transform is the identity, meaning our local transform is
// our global transform.
void LookAt(const QT3DSVec3 &inCameraPos, const QT3DSVec3 &inUpDir, const QT3DSVec3 &inTargetPos);
SCameraGlobalCalculationResult CalculateGlobalVariables(const NVRenderRectF &inViewport,
const QT3DSVec2 &inDesignDimensions);
bool CalculateProjection(const NVRenderRectF &inViewport, const QT3DSVec2 &inDesignDimensions);
bool ComputeFrustumOrtho(const NVRenderRectF &inViewport, const QT3DSVec2 &inDesignDimensions);
// Used when rendering the widgets in studio. This scales the widget when in orthographic
// mode in order to have
// constant size on screen regardless.
// Number is always greater than one
QT3DSF32 GetOrthographicScaleFactor(const NVRenderRectF &inViewport,
const QT3DSVec2 &inDesignDimensions) const;
bool ComputeFrustumPerspective(const NVRenderRectF &inViewport,
const QT3DSVec2 &inDesignDimensions);
// Text may be scaled so that it doesn't appear pixellated when the camera itself is doing
// the scaling.
QT3DSF32 GetTextScaleFactor(const NVRenderRectF &inViewport,
const QT3DSVec2 &inDesignDimensions) const;
void CalculateViewProjectionMatrix(QT3DSMat44 &outMatrix) const;
// If this is an orthographic camera, the cuboid properties are the distance from the center
// point
// to the left, top, right, and bottom edges of the view frustum in world units.
// If this is a perspective camera, the cuboid properties are the FOV angles
// (left,top,right,bottom)
// of the view frustum.
// Return a normalized rect that describes the area the camera is rendering to.
// This takes into account the various camera properties (scale mode, scale anchor).
SCuboidRect GetCameraBounds(const NVRenderRectF &inViewport,
const QT3DSVec2 &inDesignDimensions) const;
// Setup a camera VP projection for rendering offscreen.
static void SetupOrthographicCameraForOffscreenRender(NVRenderTexture2D &inTexture,
QT3DSMat44 &outVP);
static void SetupOrthographicCameraForOffscreenRender(NVRenderTexture2D &inTexture,
QT3DSMat44 &outVP, SCamera &outCamera);
// Unproject a point (x,y) in viewport relative coordinates meaning
// left, bottom is 0,0 and values are increasing right,up respectively.
SRay Unproject(const QT3DSVec2 &inLayerRelativeMouseCoords, const NVRenderRectF &inViewport,
const QT3DSVec2 &inDesignDimensions, bool sceneCameraView = false) const;
// Unproject a given coordinate to a 3d position that lies on the same camera
// plane as inGlobalPos.
// Expects CalculateGlobalVariables has been called or doesn't need to be.
QT3DSVec3 UnprojectToPosition(const QT3DSVec3 &inGlobalPos, const SRay &inRay) const;
QT3DSF32 verticalFov(QT3DSF32 aspectRatio) const;
QT3DSF32 verticalFov(const NVRenderRectF &inViewport) const;
};
}
}
#endif
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