108 lines
2.5 KiB
C++
108 lines
2.5 KiB
C++
/* camera.h
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*
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* The Camera is the eye into the scene. It defines several parameters and a
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* single compute_primary_ray method that generates rays with which the ray
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* tracer draws the scene.
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*
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* Eryn Wells <eryn@erynwells.me>
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*/
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#ifndef __CAMERA_H__
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#define __CAMERA_H__
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#include <memory>
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#include "basics.h"
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struct Camera
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{
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typedef std::shared_ptr<Camera> Ptr;
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Camera();
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Camera(const Camera& other);
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virtual ~Camera();
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const Vector3& GetOrigin() const;
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void SetOrigin(const Vector3& origin);
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const Vector3& get_direction() const;
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void set_direction(const Vector3& direction);
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const Vector3& GetRight() const;
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void SetRight(const Vector3& right);
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const Vector3& GetUp() const;
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void SetUp(const Vector3& up);
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/**
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* Pan and tilt the camera towards the given point.
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*
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* @param [in] pt The point at which to face the camera
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*/
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void LookAt(const Vector3& pt);
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virtual Ray compute_primary_ray(const int x, const int width,
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const int y, const int height) const = 0;
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private:
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/**
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* The location of the camera in the scene. Depending on the type of camera,
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* this is the point from which rays will be emitted.
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*/
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Vector3 mOrigin;
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/** A normalized vector defining where the camera is pointed. */
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Vector3 mDirection;
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/**
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* A vector defining the width of the camera's image plane. The ratio of
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* this and mUp determine the aspect ratio of the image.
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*/
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Vector3 mRight;
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/**
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* A vector defining the height of the camera's image plane. The ratio of
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* this and mRight determine the aspect ratio of the image.
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*/
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Vector3 mUp;
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virtual void WriteType(std::ostream& ost) const;
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friend std::ostream& operator<<(std::ostream& ost, const Camera& camera);
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};
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class PerspectiveCamera
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: public Camera
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{
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public:
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PerspectiveCamera();
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PerspectiveCamera(const Camera& other);
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Ray compute_primary_ray(const int x, const int width,
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const int y, const int height) const;
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private:
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void WriteType(std::ostream& ost) const;
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};
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class OrthographicCamera
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: public Camera
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{
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public:
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OrthographicCamera();
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OrthographicCamera(const Camera& other);
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Ray compute_primary_ray(const int x, const int width,
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const int y, const int height) const;
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private:
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void WriteType(std::ostream& ost) const;
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};
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std::ostream& operator<<(std::ostream& ost, const Camera& camera);
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#endif
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