eleni.mutantstargoat.com Git - vkrt/blob - src/camera.cc

   1 #include <math.h>
   2
   3 #include <gmath/gmath.h>
   4
   5 #include "camera.h"
   6
   7 Camera::Camera() {}
   8 Camera::~Camera() {}
   9
  10 OrbitCamera::OrbitCamera()
  11 {
  12         phi = theta = distance = 0;
  13 }
  14
  15 OrbitCamera::~OrbitCamera() {}
  16
  17 void OrbitCamera::set_orbit_params(float theta, float phi, float distance)
  18 {
  19         this->phi = phi;
  20         this->theta = theta;
  21         this->distance = distance;
  22 }
  23
  24 Mat4 OrbitCamera::get_view_matrix() const
  25 {
  26         Mat4 view_matrix;
  27         view_matrix.translation(-position);
  28         view_matrix.rotate_y(theta * (float)M_PI / 180);
  29         view_matrix.rotate_x(phi * (float)M_PI / 180);
  30         view_matrix.translate(Vec3(0, 0, -distance));
  31
  32         return view_matrix;
  33 }
  34
  35 Mat4 calc_projection_matrix(float fov_deg, float aspect, float n, float f)
  36 {
  37         float fov = fov_deg / 180 * M_PI;
  38
  39         float tmp;
  40         tmp = 1 / tan(fov / 2.0);
  41
  42         /* near - far clipping planes */
  43         float range = n - f;
  44
  45         Mat4 pmat = Mat4(
  46                         tmp/aspect,         0,          0,                                      0,
  47                         0,                              tmp,    0,                                      0,
  48                         0,                              0,          (f + n) / range,    -1,
  49                         0,                              0,              2 * n * f / range,  0
  50                     );
  51
  52         return pmat;
  53 }
  54
  55 void OrbitCamera::set_position(float x, float y, float z)
  56 {
  57         position.x = x;
  58         position.y = y;
  59         position.z = z;
  60 }