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136 lines
6.5 KiB
136 lines
6.5 KiB
#ifndef Magnum_SceneGraph_Camera_hpp |
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#define Magnum_SceneGraph_Camera_hpp |
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/* |
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This file is part of Magnum. |
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Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 |
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Vladimír Vondruš <mosra@centrum.cz> |
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Permission is hereby granted, free of charge, to any person obtaining a |
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copy of this software and associated documentation files (the "Software"), |
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to deal in the Software without restriction, including without limitation |
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the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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and/or sell copies of the Software, and to permit persons to whom the |
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Software is furnished to do so, subject to the following conditions: |
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The above copyright notice and this permission notice shall be included |
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in all copies or substantial portions of the Software. |
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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DEALINGS IN THE SOFTWARE. |
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*/ |
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/** @file |
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* @brief @ref compilation-speedup-hpp "Template implementation" for @ref Camera.h |
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*/ |
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#include "Magnum/Math/Functions.h" |
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#include "Magnum/SceneGraph/Camera.h" |
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#include "Magnum/SceneGraph/Drawable.h" |
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namespace Magnum { namespace SceneGraph { |
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namespace Implementation { |
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template<UnsignedInt dimensions, class T> MatrixTypeFor<dimensions, T> aspectRatioFix(AspectRatioPolicy aspectRatioPolicy, const Math::Vector2<T>& projectionScale, const Vector2i& viewport) { |
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/* Don't divide by zero / don't preserve anything */ |
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if(projectionScale.x() == 0 || projectionScale.y() == 0 || viewport.x() == 0 || viewport.y() == 0 || aspectRatioPolicy == AspectRatioPolicy::NotPreserved) |
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return {}; |
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CORRADE_INTERNAL_ASSERT((projectionScale > Math::Vector2<T>(0)).all() && (viewport > Vector2i(0)).all()); |
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Math::Vector2<T> relativeAspectRatio = Math::Vector2<T>(viewport)*projectionScale; |
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/* Extend on larger side = scale larger side down |
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Clip on smaller side = scale smaller side up */ |
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return MatrixTypeFor<dimensions, T>::scaling(Math::Vector<dimensions, T>::pad( |
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(relativeAspectRatio.x() > relativeAspectRatio.y()) == (aspectRatioPolicy == AspectRatioPolicy::Extend) ? |
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Math::Vector2<T>(relativeAspectRatio.y()/relativeAspectRatio.x(), T(1)) : |
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Math::Vector2<T>(T(1), relativeAspectRatio.x()/relativeAspectRatio.y()), T(1))); |
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} |
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} |
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template<UnsignedInt dimensions, class T> Camera<dimensions, T>::Camera(AbstractObject<dimensions, T>& object): AbstractFeature<dimensions, T>(object), _aspectRatioPolicy(AspectRatioPolicy::NotPreserved) { |
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AbstractFeature<dimensions, T>::setCachedTransformations(CachedTransformation::InvertedAbsolute); |
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} |
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template<UnsignedInt dimensions, class T> Camera<dimensions, T>::~Camera() = default; |
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template<UnsignedInt dimensions, class T> void Camera<dimensions, T>::fixAspectRatio() { |
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_projectionMatrix = Implementation::aspectRatioFix<dimensions, T>(_aspectRatioPolicy, {Math::abs(_rawProjectionMatrix[0].x()), Math::abs(_rawProjectionMatrix[1].y())}, _viewport)*_rawProjectionMatrix; |
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} |
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template<UnsignedInt dimensions, class T> Camera<dimensions, T>& Camera<dimensions, T>::setAspectRatioPolicy(AspectRatioPolicy policy) { |
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_aspectRatioPolicy = policy; |
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fixAspectRatio(); |
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return *this; |
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} |
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template<UnsignedInt dimensions, class T> Camera<dimensions, T>& Camera<dimensions, T>::setProjectionMatrix(const MatrixTypeFor<dimensions, T>& matrix) { |
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_rawProjectionMatrix = matrix; |
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fixAspectRatio(); |
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return *this; |
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} |
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template<UnsignedInt dimensions, class T> void Camera<dimensions, T>::setViewport(const Vector2i& size) { |
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_viewport = size; |
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fixAspectRatio(); |
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} |
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template<UnsignedInt dimensions, class T> std::vector<std::pair<std::reference_wrapper<Drawable<dimensions, T>>, MatrixTypeFor<dimensions, T>>> Camera<dimensions, T>::drawableTransformations(DrawableGroup<dimensions, T>& group) { |
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AbstractObject<dimensions, T>* scene = AbstractFeature<dimensions, T>::object().scene(); |
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CORRADE_ASSERT(scene, "Camera::draw(): cannot draw when camera is not part of any scene", {}); |
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/* Compute camera matrix */ |
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AbstractFeature<dimensions, T>::object().setClean(); |
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/* Compute transformations of all objects in the group relative to the camera */ |
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std::vector<std::reference_wrapper<AbstractObject<dimensions, T>>> objects; |
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objects.reserve(group.size()); |
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for(std::size_t i = 0; i != group.size(); ++i) |
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objects.push_back(group[i].object()); |
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std::vector<MatrixTypeFor<dimensions, T>> transformations = |
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scene->transformationMatrices(objects, _cameraMatrix); |
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/* Combine drawable references and transformation matrices */ |
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std::vector<std::pair<std::reference_wrapper<Drawable<dimensions, T>>, MatrixTypeFor<dimensions, T>>> combined; |
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combined.reserve(group.size()); |
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for(std::size_t i = 0; i != group.size(); ++i) |
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combined.emplace_back(group[i], transformations[i]); |
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return combined; |
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} |
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template<UnsignedInt dimensions, class T> void Camera<dimensions, T>::draw(DrawableGroup<dimensions, T>& group) { |
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AbstractObject<dimensions, T>* scene = AbstractFeature<dimensions, T>::object().scene(); |
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CORRADE_ASSERT(scene, "SceneGraph::Camera::draw(): cannot draw when camera is not part of any scene", ); |
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/* Compute camera matrix */ |
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AbstractFeature<dimensions, T>::object().setClean(); |
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/* Compute transformations of all objects in the group relative to the camera */ |
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std::vector<std::reference_wrapper<AbstractObject<dimensions, T>>> objects; |
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objects.reserve(group.size()); |
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for(std::size_t i = 0; i != group.size(); ++i) |
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objects.push_back(group[i].object()); |
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std::vector<MatrixTypeFor<dimensions, T>> transformations = |
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scene->transformationMatrices(objects, _cameraMatrix); |
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/* Perform the drawing */ |
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for(std::size_t i = 0; i != transformations.size(); ++i) |
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group[i].draw(transformations[i], *this); |
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} |
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template<UnsignedInt dimensions, class T> void Camera<dimensions, T>::draw(const std::vector<std::pair<std::reference_wrapper<Drawable<dimensions, T>>, MatrixTypeFor<dimensions, T>>>& drawableTransformations) { |
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for(auto&& drawableTransformation: drawableTransformations) |
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drawableTransformation.first.get().draw(drawableTransformation.second, *this); |
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} |
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}} |
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#endif
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