💿🐜 Antkeeper source code
https://antkeeper.com
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312 lines
8.6 KiB
312 lines
8.6 KiB
/*
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* Copyright (C) 2023 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ANTKEEPER_SCENE_CAMERA_HPP
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#define ANTKEEPER_SCENE_CAMERA_HPP
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#include <engine/scene/object.hpp>
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#include <engine/geom/primitives/view-frustum.hpp>
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#include <engine/geom/primitives/ray.hpp>
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#include <engine/math/vector.hpp>
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#include <engine/render/compositor.hpp>
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#include <engine/math/numbers.hpp>
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namespace scene {
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/**
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*
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*/
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class camera: public object<camera>
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{
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public:
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/// Camera view frustum type.
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using view_frustum_type = geom::view_frustum<float>;
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/**
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* Constructs a picking ray from normalized device coordinates (NDC).
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*
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* @param ndc NDC coordinates.
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*
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* @return Picking ray.
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*/
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[[nodiscard]] geom::ray<float, 3> pick(const math::fvec2& ndc) const;
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/**
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* Maps object coordinates to window coordinates.
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*
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* @param object Object coordinates.
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* @param viewport Vector containing the `x`, `y`, `w`, and `h` of the viewport.
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* @return Projected window coordinates.
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*/
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[[nodiscard]] math::fvec3 project(const math::fvec3& object, const math::fvec4& viewport) const;
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/**
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* Maps window coordinates to object coordinates.
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*
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* @param window Window coordinates.
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* @param viewport Vector containing the `x`, `y`, `w`, and `h` of the viewport.
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* @return Unprojected object coordinates.
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*/
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[[nodiscard]] math::fvec3 unproject(const math::fvec3& window, const math::fvec4& viewport) const;
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/**
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* Sets the camera's projection matrix using perspective projection.
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*
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* @param vertical_fov Vertical field of view, in radians.
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* @param aspect_ratio Aspect ratio.
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* @param near Distance to near clipping plane.
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* @param far Distance to far clipping plane.
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*/
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void set_perspective(float vertical_fov, float aspect_ratio, float near, float far = std::numeric_limits<float>::infinity());
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/**
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* Sets the camera's vertical field of view.
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*
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* @param vertical_fov Vertical field of view, in radians.
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*/
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void set_vertical_fov(float vertical_fov);
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/**
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* Sets the camera's aspect ratio.
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*
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* @param aspect_ratio Aspect ratio.
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*/
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void set_aspect_ratio(float aspect_ratio);
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/**
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* Sets the camera's projection matrix using orthographic projection.
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*
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* @param clip_left Signed distance to left clipping plane.
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* @param clip_right Signed distance to right clipping plane.
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* @param clip_bottom Signed distance to bottom clipping plane.
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* @param clip_top Signed distance to top clipping plane.
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* @param clip_near Signed distance to near clipping plane.
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* @param clip_far Signed distance to far clipping plane.
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*/
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void set_orthographic(float clip_left, float clip_right, float clip_bottom, float clip_top, float clip_near, float clip_far);
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/**
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* Sets the camera's ISO 100 exposure value.
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*
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* @param ev100 ISO 100 exposure value.
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*/
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void set_exposure_value(float ev100);
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/**
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* Sets the camera's compositor.
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*
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* @param compositor Compositor.
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*/
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inline void set_compositor(render::compositor* compositor) noexcept
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{
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m_compositor = compositor;
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}
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/**
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* Sets the composite index of the camera.
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*
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* @param index Composite index.
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*/
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inline void set_composite_index(int index) noexcept
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{
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m_composite_index = index;
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}
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/**
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* Returns the camera's compositor.
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*/
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/// @{
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[[nodiscard]] inline constexpr const render::compositor* get_compositor() const noexcept
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{
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return m_compositor;
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}
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[[nodiscard]] inline constexpr render::compositor* get_compositor() noexcept
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{
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return m_compositor;
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}
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/// @}
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/// Returns the composite index of the camera.
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[[nodiscard]] inline constexpr int get_composite_index() const noexcept
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{
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return m_composite_index;
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}
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[[nodiscard]] inline constexpr const aabb_type& get_bounds() const noexcept override
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{
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return m_bounds;
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}
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/// Returns `true` if the camera uses an orthographic projection matrix, `false` otherwise.
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[[nodiscard]] inline constexpr bool is_orthographic() const noexcept
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{
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return m_orthographic;
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}
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/// Returns the signed distance to the camera's left clipping plane.
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[[nodiscard]] inline constexpr float get_clip_left() const noexcept
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{
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return m_clip_left;
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}
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/// Returns the signed distance to the camera's right clipping plane.
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[[nodiscard]] inline constexpr float get_clip_right() const noexcept
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{
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return m_clip_right;
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}
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/// Returns the signed distance to the camera's bottom clipping plane.
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[[nodiscard]] inline constexpr float get_clip_bottom() const noexcept
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{
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return m_clip_bottom;
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}
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/// Returns the signed distance to the camera's top clipping plane.
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[[nodiscard]] inline constexpr float get_clip_top() const noexcept
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{
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return m_clip_top;
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}
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/// Returns the signed distance to the camera's near clipping plane.
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[[nodiscard]] inline constexpr float get_clip_near() const noexcept
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{
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return m_clip_near;
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}
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/// Returns the signed distance to the camera's far clipping plane.
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[[nodiscard]] inline constexpr float get_clip_far() const noexcept
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{
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return m_clip_far;
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}
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/// Returns the camera's vertical field of view, in radians.
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[[nodiscard]] inline constexpr float get_vertical_fov() const noexcept
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{
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return m_vertical_fov;
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}
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/// Returns the camera's aspect ratio.
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[[nodiscard]] inline constexpr float get_aspect_ratio() const noexcept
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{
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return m_aspect_ratio;
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}
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/// Returns the camera's ISO 100 exposure value.
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[[nodiscard]] inline constexpr float get_exposure_value() const noexcept
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{
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return m_exposure_value;
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}
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/// Returns the camera's exposure normalization factor.
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[[nodiscard]] inline constexpr float get_exposure_normalization() const noexcept
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{
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return m_exposure_normalization;
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}
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/// Returns the camera's view matrix.
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[[nodiscard]] inline constexpr const math::fmat4& get_view() const noexcept
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{
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return m_view;
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}
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/// Returns the inverse of the camera's view matrix.
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[[nodiscard]] inline constexpr const math::fmat4& get_inv_view() const noexcept
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{
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return m_inv_view;
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}
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/// Returns the camera's projection matrix.
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[[nodiscard]] inline constexpr const math::fmat4& get_projection() const noexcept
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{
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return m_projection;
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}
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/// Returns the inverse of the camera's projection matrix.
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[[nodiscard]] inline constexpr const math::fmat4& get_inv_projection() const noexcept
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{
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return m_inv_projection;
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}
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/// Returns the camera's view-projection matrix.
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[[nodiscard]] inline constexpr const math::fmat4& get_view_projection() const noexcept
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{
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return m_view_projection;
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}
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/// Returns the inverse of the camera's view-projection matrix.
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[[nodiscard]] inline constexpr const math::fmat4& get_inv_view_projection() const noexcept
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{
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return m_inv_view_projection;
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}
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/// Returns the camera's forward vector.
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[[nodiscard]] inline constexpr const math::fvec3& get_forward() const noexcept
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{
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return m_forward;
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}
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/// Returns the camera's up vector.
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[[nodiscard]] inline constexpr const math::fvec3& get_up() const noexcept
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{
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return m_up;
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}
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/// Returns the camera's view frustum.
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[[nodiscard]] inline constexpr const view_frustum_type& get_view_frustum() const noexcept
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{
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return m_view_frustum;
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}
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private:
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void transformed() override;
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void update_frustum();
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render::compositor* m_compositor{nullptr};
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int m_composite_index{0};
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bool m_orthographic{true};
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float m_clip_left{-1.0f};
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float m_clip_right{1.0f};
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float m_clip_bottom{-1.0f};
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float m_clip_top{1.0f};
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float m_clip_near{-1.0f};
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float m_clip_far{1.0f};
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float m_vertical_fov{math::half_pi<float>};
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float m_aspect_ratio{1.0f};
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float m_exposure_value{0.0f};
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float m_exposure_normalization{1.0f};
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math::fvec3 m_forward{0.0f, 0.0f, -1.0f};
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math::fvec3 m_up{0.0f, 1.0f, 0.0f};
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math::fmat4 m_view{math::fmat4::identity()};
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math::fmat4 m_inv_view{math::fmat4::identity()};
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math::fmat4 m_projection{math::fmat4::identity()};
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math::fmat4 m_inv_projection{math::fmat4::identity()};
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math::fmat4 m_view_projection{math::fmat4::identity()};
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math::fmat4 m_inv_view_projection{math::fmat4::identity()};
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view_frustum_type m_view_frustum;
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aabb_type m_bounds{{}, {}};
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};
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} // namespace scene
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#endif // ANTKEEPER_SCENE_CAMERA_HPP
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