--- /dev/null
+/*
+This file is part of the 3dengfx, realtime visualization system.
+
+Copyright (c) 2004, 2005 John Tsiombikas <nuclear@siggraph.org>
+
+3dengfx is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+3dengfx is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with 3dengfx; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include "3dengfx_config.h"
+
+#include "camera.hpp"
+#include "3denginefx.hpp"
+
+Camera::Camera(const Vector3 &translation, const Quaternion &rot)
+ : BaseCamera(translation, rot) {}
+
+Matrix4x4 Camera::get_camera_matrix(unsigned long msec) const {
+ PRS prs = get_prs(msec);
+
+ Matrix4x4 vmat = prs.rotation.inverse().get_rotation_matrix();
+ vmat.translate(-prs.position);
+
+ // TODO: this does not work...
+ Matrix4x4 flip_matrix;
+ if(flip_view.x) flip_matrix[0][0] = -1;
+ if(flip_view.y) flip_matrix[1][1] = -1;
+ if(flip_view.z) flip_matrix[2][2] = -1;
+
+ return flip_matrix * vmat;
+}
+/*
+void Camera::activate(unsigned long msec) const {
+ set_matrix(XFORM_VIEW, get_camera_matrix(msec));
+
+ Matrix4x4 proj = get_projection_matrix();
+ set_matrix(XFORM_PROJECTION, proj);
+
+ engfx_state::view_mat_camera = this;
+ const_cast<Camera*>(this)->setup_frustum(proj * engfx_state::view_matrix);
+}
+*/
+
+TargetCamera::TargetCamera(const Vector3 &trans, const Vector3 &target) : Camera(trans) {
+ set_target(target);
+}
+
+TargetCamera::~TargetCamera() {}
+
+void TargetCamera::set_target(const Vector3 &target) {
+ this->target.set_position(target);
+}
+
+Vector3 TargetCamera::get_target(unsigned long msec) const {
+ return target.get_prs(msec).position;
+}
+
+Matrix4x4 TargetCamera::get_camera_matrix(unsigned long msec) const {
+ PRS prs = get_prs(msec);
+ Vector3 targ = target.get_prs(msec).position;
+
+ Vector3 pvec = prs.position - targ;
+ pvec.transform(prs.rotation.get_rotation_matrix());
+ Vector3 pos = targ + pvec;
+
+#ifdef COORD_LHS
+ Vector3 n = (targ - pos).normalized();
+#else
+ Vector3 n = -(targ - pos).normalized();
+#endif
+ Vector3 u = cross_product(up, n).normalized();
+ Vector3 v;
+
+ if(flip_view.y) {
+ v = cross_product(u, n);
+ set_front_face(ORDER_CCW);
+ } else {
+ v = cross_product(n, u);
+ set_front_face(ORDER_CW);
+ }
+
+ scalar_t tx = -dot_product(u, pos);
+ scalar_t ty = -dot_product(v, pos);
+ scalar_t tz = -dot_product(n, pos);
+
+ return Matrix4x4(u.x, u.y, u.z, tx,
+ v.x, v.y, v.z, ty,
+ n.x, n.y, n.z, tz,
+ 0.0, 0.0, 0.0, 1.0);
+}
+
+/*
+void TargetCamera::activate(unsigned long msec) const {
+ set_matrix(XFORM_VIEW, get_camera_matrix(msec));
+
+ Matrix4x4 proj = get_projection_matrix();
+ set_matrix(XFORM_PROJECTION, proj);
+
+ engfx_state::view_mat_camera = this;
+ const_cast<TargetCamera*>(this)->setup_frustum(proj * engfx_state::view_matrix);
+}
+*/
+
+void TargetCamera::zoom(scalar_t factor, unsigned long msec) {
+ Vector3 pos = get_prs(msec).position;
+ Vector3 targ = get_target(msec);
+
+ Vector3 dist_vec = (pos - targ) * factor;
+
+ set_position(targ + dist_vec, msec);
+}
+
+void TargetCamera::roll(scalar_t angle, unsigned long msec) {
+ Vector3 axis = target.get_prs(msec).position - get_prs(msec).position;
+ Quaternion q(axis.normalized(), fmod(angle, two_pi));
+ up = Vector3(0, 1, 0);
+ up.transform(q);
+}