added 3dengfx into the repo, probably not the correct version for this

[summerhack] / src / 3dengfx / src / 3dengfx / camera.cpp

diff --git a/src/3dengfx/src/3dengfx/camera.cpp b/src/3dengfx/src/3dengfx/camera.cpp
new file mode 100644 (file)
index 0000000..c35055a
--- /dev/null
+++ b/src/3dengfx/src/3dengfx/camera.cpp
@@ -0,0 +1,129 @@
+/*
+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);
+}