109 lines
3.2 KiB
C++
109 lines
3.2 KiB
C++
|
//***********************************************************
|
||
|
|
//
|
||
|
|
// Name: Camera.Cpp
|
||
|
|
// Last Update: 24/2/02
|
||
|
|
// Author: Poya Manouchehri
|
||
|
|
//
|
||
|
|
// Description: CCamera holds a view and a projection matrix.
|
||
|
|
// It also has a frustum which can be used to
|
||
|
|
// cull objects for rendering.
|
||
|
|
//
|
||
|
|
//***********************************************************
|
||
|
|
|
||
|
|
#include "Camera.H"
|
||
|
|
|
||
|
|
extern int xres, yres;
|
||
|
|
|
||
|
|
CCamera::CCamera ()
|
||
|
|
{
|
||
|
|
m_ViewPort.m_Width = 1280;
|
||
|
|
m_ViewPort.m_Height = 1024;
|
||
|
|
m_ViewPort.m_X = 0;
|
||
|
|
m_ViewPort.m_Y = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
CCamera::~CCamera ()
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
void CCamera::SetProjection (float nearp, float farp, float fov)
|
||
|
|
{
|
||
|
|
float h, w, Q;
|
||
|
|
|
||
|
|
m_NearPlane = nearp;
|
||
|
|
m_FarPlane = farp;
|
||
|
|
m_FOV = fov;
|
||
|
|
|
||
|
|
float Aspect = (float)m_ViewPort.m_Width/(float)m_ViewPort.m_Height;
|
||
|
|
|
||
|
|
w = 1/tanf (fov*0.5f*Aspect);
|
||
|
|
h = 1/tanf (fov*0.5f);
|
||
|
|
Q = m_FarPlane / (m_FarPlane - m_NearPlane);
|
||
|
|
|
||
|
|
m_ProjMat.SetZero ();
|
||
|
|
m_ProjMat._11 = w;
|
||
|
|
m_ProjMat._22 = h;
|
||
|
|
m_ProjMat._33 = Q;
|
||
|
|
m_ProjMat._34 = -Q*m_NearPlane;
|
||
|
|
m_ProjMat._43 = 1.0f;
|
||
|
|
}
|
||
|
|
|
||
|
|
//Updates the frustum planes. Should be called
|
||
|
|
//everytime the view or projection matrices are
|
||
|
|
//altered.
|
||
|
|
void CCamera::UpdateFrustum ()
|
||
|
|
{
|
||
|
|
CMatrix3D MatFinal;
|
||
|
|
CMatrix3D MatView;
|
||
|
|
|
||
|
|
MatView = m_Orientation.GetTranspose ();
|
||
|
|
|
||
|
|
MatFinal = m_ProjMat * MatView;
|
||
|
|
|
||
|
|
//get the RIGHT plane
|
||
|
|
m_ViewFrustum.SetNumPlanes (6);
|
||
|
|
|
||
|
|
m_ViewFrustum.m_aPlanes[0].m_Norm.X = MatFinal._41-MatFinal._11;
|
||
|
|
m_ViewFrustum.m_aPlanes[0].m_Norm.Y = MatFinal._42-MatFinal._12;
|
||
|
|
m_ViewFrustum.m_aPlanes[0].m_Norm.Z = MatFinal._43-MatFinal._13;
|
||
|
|
m_ViewFrustum.m_aPlanes[0].m_Dist = MatFinal._44-MatFinal._14;
|
||
|
|
|
||
|
|
//get the LEFT plane
|
||
|
|
m_ViewFrustum.m_aPlanes[1].m_Norm.X = MatFinal._41+MatFinal._11;
|
||
|
|
m_ViewFrustum.m_aPlanes[1].m_Norm.Y = MatFinal._42+MatFinal._12;
|
||
|
|
m_ViewFrustum.m_aPlanes[1].m_Norm.Z = MatFinal._43+MatFinal._13;
|
||
|
|
m_ViewFrustum.m_aPlanes[1].m_Dist = MatFinal._44+MatFinal._14;
|
||
|
|
|
||
|
|
//get the BOTTOM plane
|
||
|
|
m_ViewFrustum.m_aPlanes[2].m_Norm.X = MatFinal._41+MatFinal._21;
|
||
|
|
m_ViewFrustum.m_aPlanes[2].m_Norm.Y = MatFinal._42+MatFinal._22;
|
||
|
|
m_ViewFrustum.m_aPlanes[2].m_Norm.Z = MatFinal._43+MatFinal._23;
|
||
|
|
m_ViewFrustum.m_aPlanes[2].m_Dist = MatFinal._44+MatFinal._24;
|
||
|
|
|
||
|
|
//get the TOP plane
|
||
|
|
m_ViewFrustum.m_aPlanes[3].m_Norm.X = MatFinal._41-MatFinal._21;
|
||
|
|
m_ViewFrustum.m_aPlanes[3].m_Norm.Y = MatFinal._42-MatFinal._22;
|
||
|
|
m_ViewFrustum.m_aPlanes[3].m_Norm.Z = MatFinal._43-MatFinal._23;
|
||
|
|
m_ViewFrustum.m_aPlanes[3].m_Dist = MatFinal._44-MatFinal._24;
|
||
|
|
|
||
|
|
//get the FAR plane
|
||
|
|
m_ViewFrustum.m_aPlanes[4].m_Norm.X = MatFinal._41-MatFinal._31;
|
||
|
|
m_ViewFrustum.m_aPlanes[4].m_Norm.Y = MatFinal._42-MatFinal._32;
|
||
|
|
m_ViewFrustum.m_aPlanes[4].m_Norm.Z = MatFinal._43-MatFinal._33;
|
||
|
|
m_ViewFrustum.m_aPlanes[4].m_Dist = MatFinal._44-MatFinal._34;
|
||
|
|
|
||
|
|
//get the NEAR plane
|
||
|
|
m_ViewFrustum.m_aPlanes[5].m_Norm.X = MatFinal._41+MatFinal._31;
|
||
|
|
m_ViewFrustum.m_aPlanes[5].m_Norm.Y = MatFinal._42+MatFinal._32;
|
||
|
|
m_ViewFrustum.m_aPlanes[5].m_Norm.Z = MatFinal._43+MatFinal._33;
|
||
|
|
m_ViewFrustum.m_aPlanes[5].m_Dist = MatFinal._44+MatFinal._34;
|
||
|
|
}
|
||
|
|
|
||
|
|
void CCamera::SetViewPort (SViewPort *viewport)
|
||
|
|
{
|
||
|
|
m_ViewPort.m_X = viewport->m_X;
|
||
|
|
m_ViewPort.m_Y = viewport->m_Y;
|
||
|
|
m_ViewPort.m_Width = viewport->m_Width;
|
||
|
|
m_ViewPort.m_Height = viewport->m_Height;
|
||
|
|
}
|