h4570
79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
/*
|
|
# ______ ____ ___
|
|
# | \/ ____| |___|
|
|
# | | | \ | |
|
|
#-----------------------------------------------------------------------
|
|
# Copyright 2020, tyra - https://github.com/h4570/tyra
|
|
# Licenced under Apache License 2.0
|
|
# Sandro Sobczyński <sandro.sobczynski@gmail.com>
|
|
*/
|
|
|
|
#include "../include/modules/camera_base.hpp"
|
|
|
|
#include <fastmath.h>
|
|
#include "../include/utils/debug.hpp"
|
|
#include "../include/utils/math.hpp"
|
|
|
|
// ----
|
|
// Constructors/Destructors
|
|
// ----
|
|
|
|
CameraBase::CameraBase(ScreenSettings *t_screen, Vector3 *t_position)
|
|
: screen(t_screen)
|
|
{
|
|
PRINT_LOG("Initializing frustum");
|
|
farPlaneDist = screen->farPlaneDist;
|
|
nearPlaneDist = screen->nearPlaneDist;
|
|
float tang = tanf(screen->fov * Math::HALF_ANG2RAD);
|
|
nearHeight = tang * nearPlaneDist;
|
|
nearWidth = nearHeight * screen->aspectRatio;
|
|
farHeight = tang * farPlaneDist;
|
|
farWidth = farHeight * screen->aspectRatio;
|
|
p_position = t_position;
|
|
up.set(0.0F, 1.0F, 0.0F);
|
|
PRINT_LOG("CameraBase initialized!");
|
|
}
|
|
|
|
// ----
|
|
// Methods
|
|
// ----
|
|
|
|
void CameraBase::lookAt(Vector3 &t_target)
|
|
{
|
|
updatePlanes(t_target);
|
|
view.lookAt(*p_position, t_target);
|
|
}
|
|
|
|
void CameraBase::updatePlanes(Vector3 t_target)
|
|
{
|
|
Vector3 nearCenter, farCenter, X, Y, Z;
|
|
// compute the Z axis of camera
|
|
Z = *p_position - t_target;
|
|
Z.normalize();
|
|
// X axis of camera of given "up" vector and Z axis
|
|
X = up * Z;
|
|
X.normalize();
|
|
// the real "up" vector is the cross product of Z and X
|
|
Y = Z * X;
|
|
// compute the center of the near and far planes
|
|
nearCenter = *p_position - Z * nearPlaneDist;
|
|
farCenter = *p_position - Z * farPlaneDist;
|
|
// compute the 8 corners of the frustum
|
|
ntl = nearCenter + Y * nearHeight - X * nearWidth;
|
|
ntr = nearCenter + Y * nearHeight + X * nearWidth;
|
|
nbl = nearCenter - Y * nearHeight - X * nearWidth;
|
|
nbr = nearCenter - Y * nearHeight + X * nearWidth;
|
|
|
|
ftl = farCenter + Y * farHeight - X * farWidth;
|
|
fbr = farCenter - Y * farHeight + X * farWidth;
|
|
ftr = farCenter + Y * farHeight + X * farWidth;
|
|
fbl = farCenter - Y * farHeight - X * farWidth;
|
|
|
|
planes[0].update(ntr, ntl, ftl); // Top
|
|
planes[1].update(nbl, nbr, fbr); // BOTTOM
|
|
planes[2].update(ntl, nbl, fbl); // LEFT
|
|
planes[3].update(nbr, ntr, fbr); // RIGHT
|
|
planes[4].update(ntl, ntr, nbr); // NEAR
|
|
planes[5].update(ftr, ftl, fbl); // FAR
|
|
}
|