#include "camera.h"

vec3 camera_position;
vec3 camera_rotation;

void
camera_get_direction (vec3 dest)
{
  dest[0] = sinf (camera_rotation[0]) * cosf (camera_rotation[1]);
  dest[1] = sinf (camera_rotation[1]);
  dest[2] = cosf (camera_rotation[0]) * cosf (camera_rotation[1]);
  glm_vec3_normalize (dest);
}

void
camera_get_right (vec3 dest)
{
  vec3 dir;
  camera_get_direction (dir);
  glm_vec3_cross (dir, GLM_YUP, dest);
  glm_vec3_normalize (dest);
}

void
camera_get_view (mat4 dest)
{
  vec3 dir, center;
  camera_get_direction (dir);
  glm_vec3_add (camera_position, dir, center);
  glm_lookat (camera_position, center, GLM_YUP, dest);
}

void
camera_get_projection (float aspect, mat4 dest)
{
  glm_perspective (glm_rad (70), aspect, 0.01, 7000.0, dest);
}