src/client/camera.c

   1 #include <math.h>
   2 #include "client/client.h"
   3 #include "client/camera.h"
   4
   5 static struct
   6 {
   7         mat4x4 view;
   8         vec3 eye, front, right, up;
   9 } camera;
  10
  11 static const vec3 world_up = {0.0f, 1.0f, 0.0f};
  12
  13 struct camera_movement_dirs camera_movement_dirs = {
  14         .front = {0.0f},
  15         .right = {0.0f},
  16         .up = {world_up[0], world_up[1], world_up[2]},
  17 };
  18
  19 static void camera_update()
  20 {
  21         vec3 center;
  22         vec3_add(center, camera.eye, camera.front);
  23
  24         mat4x4_look_at(camera.view, camera.eye, center, camera.up);
  25 }
  26
  27 void camera_enable(GLint loc_view)
  28 {
  29         glUniformMatrix4fv(loc_view, 1, GL_FALSE, camera.view[0]);
  30 }
  31
  32 void camera_set_position(v3f32 pos)
  33 {
  34         camera.eye[0] = pos.x;
  35         camera.eye[1] = pos.y;
  36         camera.eye[2] = pos.z;
  37
  38         camera_update();
  39 }
  40
  41 void camera_set_angle(f32 yaw, f32 pitch)
  42 {
  43         camera.front[0] = camera_movement_dirs.front[0] = cos(yaw) * cos(pitch);
  44         camera.front[1] = sin(pitch);
  45         camera.front[2] = camera_movement_dirs.front[2] = sin(yaw) * cos(pitch);
  46
  47         vec3_norm(camera.front, camera.front);
  48         vec3_norm(camera_movement_dirs.front, camera_movement_dirs.front);
  49
  50         vec3_mul_cross(camera.right, camera.front, world_up);
  51         camera_movement_dirs.right[0] = camera.right[0];
  52         camera_movement_dirs.right[2] = camera.right[2];
  53
  54         vec3_norm(camera.right, camera.right);
  55         vec3_norm(camera_movement_dirs.right, camera_movement_dirs.right);
  56
  57         vec3_mul_cross(camera.up, camera.right, camera.front);
  58         vec3_norm(camera.up, camera.up);
  59
  60         camera_update();
  61 }