src/client/camera.c

   1 #include <math.h>
   2 #include "client/camera.h"
   3
   4 struct Camera camera;
   5
   6 static const vec3 world_up = {0.0f, 1.0f, 0.0f};
   7
   8 static void camera_update()
   9 {
  10         vec3 center;
  11         vec3_add(center, camera.eye, camera.front);
  12
  13         mat4x4_look_at(camera.view, camera.eye, center, camera.up);
  14 }
  15
  16 void camera_init()
  17 {
  18         camera_set_position((v3f32) {0.0f, 0.0f, 0.0f});
  19         camera_set_angle(0.0f, 0.0f);
  20 }
  21
  22 void camera_set_position(v3f32 pos)
  23 {
  24         camera.eye[0] = pos.x;
  25         camera.eye[1] = pos.y;
  26         camera.eye[2] = pos.z;
  27
  28         camera_update();
  29 }
  30
  31 void camera_set_angle(f32 yaw, f32 pitch)
  32 {
  33         camera.front[0] = camera.movement_dirs.front[0] = cos(yaw) * cos(pitch);
  34         camera.front[1] = sin(pitch);
  35         camera.front[2] = camera.movement_dirs.front[2] = sin(yaw) * cos(pitch);
  36
  37         vec3_norm(camera.front, camera.front);
  38         vec3_norm(camera.movement_dirs.front, camera.movement_dirs.front);
  39
  40         vec3_mul_cross(camera.right, camera.front, world_up);
  41         camera.movement_dirs.right[0] = camera.right[0];
  42         camera.movement_dirs.right[2] = camera.right[2];
  43
  44         vec3_norm(camera.right, camera.right);
  45         vec3_norm(camera.movement_dirs.right, camera.movement_dirs.right);
  46
  47         vec3_mul_cross(camera.up, camera.right, camera.front);
  48         vec3_norm(camera.up, camera.up);
  49
  50         camera.movement_dirs.up[0] = world_up[0];
  51         camera.movement_dirs.up[1] = world_up[1];
  52         camera.movement_dirs.up[2] = world_up[2];
  53
  54         camera_update();
  55 }