120 lines
3.7 KiB
C++
120 lines
3.7 KiB
C++
//***********************************************************
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//
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// Name: Camera.H
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// Last Update: 24/2/02
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// Author: Poya Manouchehri
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//
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// Description: CCamera holds a view and a projection matrix.
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// It also has a frustum which can be used to
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// cull objects for rendering.
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//
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//***********************************************************
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#ifndef CAMERA_H
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#define CAMERA_H
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#include "Frustum.h"
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#include "maths/Matrix3D.h"
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extern int g_mouse_x, g_mouse_y;
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// view port
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struct SViewPort
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{
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unsigned int m_X;
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unsigned int m_Y;
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unsigned int m_Width;
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unsigned int m_Height;
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};
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class CCamera
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{
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public:
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CCamera ();
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~CCamera ();
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// Methods for projection
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void SetProjection (CMatrix3D *proj) { m_ProjMat = *proj; }
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void SetProjection (float nearp, float farp, float fov);
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void SetProjectionTile (int tiles, int tile_x, int tile_y);
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CMatrix3D GetProjection () { return m_ProjMat; }
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// Updates the frustum planes. Should be called
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// everytime the view or projection matrices are
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// altered.
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void UpdateFrustum ();
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CFrustum GetFrustum () { return m_ViewFrustum; }
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void SetViewPort (SViewPort *viewport);
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SViewPort GetViewPort () { return m_ViewPort; }
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// getters
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float GetNearPlane() const { return m_NearPlane; }
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float GetFarPlane() const { return m_FarPlane; }
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float GetFOV() const { return m_FOV; }
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// calculate and return the position of the 8 points of the frustum in world space
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void GetFrustumPoints(CVector3D pts[8]) const;
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// return four points in camera space at given distance from camera
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void GetCameraPlanePoints(float dist,CVector3D pts[4]) const;
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// Build a ray passing through the screen coordinate (px, py) and the camera
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/////////////////////////////////////////////////////////////////////////////////////////
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// BuildCameraRay: calculate origin and ray direction of a ray through
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// the pixel (px,py) on the screen
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void BuildCameraRay(int px, int py, CVector3D& origin, CVector3D& dir);
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// BuildCameraRay: as previous, using global mouse position
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void BuildCameraRay(CVector3D& origin, CVector3D& dir)
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{
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BuildCameraRay(g_mouse_x, g_mouse_y, origin, dir);
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}
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// General helpers that seem to fit here
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// Get the screen-space coordinates corresponding to a given world-space position
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void GetScreenCoordinates(const CVector3D& world, float& x, float& y) const;
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// Get the point on the terrain corresponding to pixel (px,py) (or the mouse coordinates)
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CVector3D GetWorldCoordinates(int px, int py);
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CVector3D GetWorldCoordinates() { return GetWorldCoordinates(g_mouse_x, g_mouse_y); }
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// Get the point on the plane at height h corresponding to pixel (px,py)
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CVector3D GetWorldCoordinates(int px, int py, float h);
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// Get the point on the terrain the camera is pointing towards
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CVector3D GetFocus();
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// Build an orientation matrix from camera position, camera focus point, and up-vector
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void LookAt(const CVector3D& camera, const CVector3D& orientation, const CVector3D& up);
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// Build an orientation matrix from camera position, camera orientation, and up-vector
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void LookAlong(CVector3D camera, CVector3D focus, CVector3D up);
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/**
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* Render: Renders the camera's frustum in world space.
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* The caller should set the color using glColorXy before calling Render.
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*
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* @param intermediates determines how many intermediate distance planes should
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* be hinted at between the near and far planes
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*/
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void Render(uint intermediates = 0) const;
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public:
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// This is the orientation matrix. The inverse of this
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// is the view matrix
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CMatrix3D m_Orientation;
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// Should not be tweaked externally if possible
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CMatrix3D m_ProjMat;
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private:
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float m_NearPlane;
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float m_FarPlane;
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float m_FOV;
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SViewPort m_ViewPort;
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CFrustum m_ViewFrustum;
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};
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#endif
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