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

[summerhack] / src / 3dengfx / src / gfx / base_cam.cpp

diff --git a/src/3dengfx/src/gfx/base_cam.cpp b/src/3dengfx/src/gfx/base_cam.cpp
new file mode 100644 (file)
index 0000000..2078529
--- /dev/null
+++ b/src/3dengfx/src/gfx/base_cam.cpp
@@ -0,0 +1,172 @@
+/*
+This file is part of the graphics core library.
+
+Copyright (c) 2004, 2005 John Tsiombikas <nuclear@siggraph.org>
+
+the graphics core library 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.
+
+the graphics core library 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 the graphics core library; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+#include "3dengfx_config.h"
+
+#include "base_cam.hpp"
+
+#ifdef USING_3DENGFX
+#include "3dengfx/3denginefx.hpp"
+#endif // USING_3DENGFX
+
+FrustumPlane::FrustumPlane() {
+       a = b = c = d = 0;
+}
+
+FrustumPlane::FrustumPlane(scalar_t a, scalar_t b, scalar_t c, scalar_t d) {
+       this->a = a;
+       this->b = b;
+       this->c = c;
+       this->d = d;
+}
+
+// frustum plane extraction from a projection (or mvp) matrix
+FrustumPlane::FrustumPlane(const Matrix4x4 &mat, int plane) {
+       int i = plane / 2;
+       int neg = plane % 2;
+
+       a = mat[3][0] + (neg ? -mat[i][0] : mat[i][0]);
+       b = mat[3][1] + (neg ? -mat[i][1] : mat[i][1]);
+       c = mat[3][2] + (neg ? -mat[i][2] : mat[i][2]);
+       d = mat[3][3] + (neg ? -mat[i][3] : mat[i][3]);
+
+       // normalize plane equation
+       scalar_t len = Vector3(a, b, c).length();
+       a /= len;
+       b /= len;
+       c /= len;
+       d /= len;
+}
+
+BaseCamera::BaseCamera(const Vector3 &trans, const Quaternion &rot) {
+       set_position(trans);
+       set_rotation(rot);
+       up = Vector3(0, 1, 0);
+       fov = quarter_pi;
+       near_clip = 1.0;
+       far_clip = 10000.0;
+       aspect = 1.33333;
+       flip_view.x = flip_view.y = flip_view.z = false;
+}
+
+BaseCamera::~BaseCamera() {}
+
+void BaseCamera::setup_frustum(const Matrix4x4 &m) {
+       for(int i=0; i<6; i++) {
+               frustum[i] = FrustumPlane(m, i);
+       }
+}
+
+void BaseCamera::set_up_vector(const Vector3 &up) {
+       this->up = up;
+}
+
+void BaseCamera::set_fov(scalar_t angle) {
+       fov = angle;
+}
+
+scalar_t BaseCamera::get_fov() const {
+       return fov;
+}
+
+void BaseCamera::set_aspect(scalar_t aspect) {
+       this->aspect = aspect;
+}
+
+scalar_t BaseCamera::get_aspect() const {
+       return aspect;
+}
+
+void BaseCamera::set_clipping_planes(scalar_t near_clip, scalar_t far_clip) {
+       this->near_clip = near_clip;
+       this->far_clip = far_clip;
+}
+
+void BaseCamera::set_clipping_plane(scalar_t val, ClipPlane which) {
+       if(which == CLIP_NEAR) {
+               near_clip = val;
+       } else {
+               far_clip = val;
+       }
+}
+
+scalar_t BaseCamera::get_clipping_plane(ClipPlane which) const {
+       return which == CLIP_NEAR ? near_clip : far_clip;
+}
+
+
+void BaseCamera::zoom(scalar_t zoom_factor, unsigned long msec) {
+       Vector3 zoom_dir(0, 0, zoom_factor);
+       PRS prs = get_prs(msec);
+
+       zoom_dir.transform(prs.rotation.inverse());
+       translate(zoom_dir, msec);
+}
+
+void BaseCamera::pan(const Vector2 &dir, unsigned long msec) {
+       Vector3 i(1, 0, 0), j(0, 1, 0);
+       
+       PRS prs = get_prs(msec);
+       
+       i.transform(prs.rotation.inverse());
+       j.transform(prs.rotation.inverse());
+       
+       translate(i * dir.x);
+       translate(j * dir.y);
+}
+
+void BaseCamera::roll(scalar_t angle, unsigned long msec) {
+       Vector3 dir(0, 0, 1);
+       dir.transform(get_prs(msec).rotation);
+
+       Quaternion q(dir, angle);
+       up = Vector3(0, 1, 0);
+       up.transform(q);
+}
+
+void BaseCamera::flip(bool x, bool y, bool z) {
+       flip_view.x = x;
+       flip_view.y = y;
+       flip_view.z = z;
+}
+
+const FrustumPlane *BaseCamera::get_frustum() const {
+       return frustum;
+}
+
+Matrix4x4 BaseCamera::get_projection_matrix() const {
+#ifdef USING_3DENGFX
+       return create_projection_matrix(fov, aspect, near_clip, far_clip);
+#else
+       return Matrix4x4::identity_matrix;
+#endif // USING_3DENGFX
+}
+
+void BaseCamera::activate(unsigned long msec) const {
+#ifdef USING_3DENGFX
+       set_matrix(XFORM_VIEW, get_camera_matrix(msec));
+
+       Matrix4x4 proj = get_projection_matrix();
+       set_matrix(XFORM_PROJECTION, proj);
+
+       engfx_state::view_mat_camera = (const Camera*)this;
+       const_cast<BaseCamera*>(this)->setup_frustum(proj * engfx_state::view_matrix);
+#endif // USING_3DENGFX
+}