/**
* Called every time the cursor moves. It is used to calculate the Camera's direction
* in window - the window holding the cursor
* in xpos - the xposition of the cursor on the screen
* in ypos - the yposition of the curose on the screen
*/
static void cursor_position_callback(GLFWwindow *window, double xpos, double ypos) {
GLfloat quat[] = {0.0f,0.0f,0.0f,0.0f};
//calculate pitch
static double previous_ypos = ypos;
double position_y_difference = ypos - previous_ypos;
previous_ypos = ypos;
//calculate yaw
static double previous_xpos = xpos;
double position_x_difference = xpos - previous_xpos;
previous_xpos = xpos;
//reduce signal
camera.yaw += position_x_difference *camera.signal_amplifier;
camera.pitch += position_y_difference *camera.signal_amplifier;
//calculate rotation sequence
create_versor(quat, camera.pitch, 1.0f, 0.0f, 0.0f);
quat_to_mat4(camera.Rpitch.m, quat);
create_versor(quat, camera.yaw, 0.0f, 1.0f, 0.0f);
quat_to_mat4(camera.Ryaw.m,quat);
// mult_quat_quat(camera.resultQuat, camera.quatYaw, camera.quatPitch);
// mult_quat_quat(camera.resultQuat, camera.quatYaw, camera.quatPitch);
// quat_to_mat4(camera.R.m, camera.resultQuat);
}
static void calculateCursorRotations(Cursor *cursor){
GLfloat quat[] = {0.0f,0.0f,0.0f,0.0f};
create_versor(quat, cursor->pitch, 1.0f, 0.0f, 0.0f);
quat_to_mat4(cursor->Rpitch.m, quat);
create_versor(quat, cursor->yaw, 0.0f, 1.0f, 0.0f);
quat_to_mat4(cursor->Ryaw.m, quat);
create_versor(quat, cursor->roll, 0.0f, 0.0f, 1.0f);
quat_to_mat4(cursor->Rroll.m, quat);
}
GLCamera::GLCamera(float aspect)
{
near = 0.1f;
far = 100.0f;
fovy = 67.0f;
//aspect = (float)g_gl_width / (float)g_gl_height;
this->aspect = aspect;
proj_mat = perspective(fovy, this->aspect, near, far);
cam_speed = 5.0f;
cam_heading_speed = 100.0f;
cam_heading = 0.0f;
cam_pos = vector3(0.0f, 0.0f, 5.0f);
T = identity_mat4().translate( vector3(-cam_pos.v[0], -cam_pos.v[1], -cam_pos.v[2]) );
create_versor(quaternion, -cam_heading, 0.0f, 1.0f, 0.0f);
quat_to_mat4(R.m, quaternion);
// combine the inverse rotation and transformation to make a view matrix
view_mat = R * T;
// keep track of some useful vectors that can be used for keyboard movement
fwd = vector4(0.0f, 0.0f, -1.0f, 0.0f);
rgt = vector4(1.0f, 0.0f, 0.0f, 0.0f);
up = vector4(0.0f, 1.0f, 0.0f, 0.0f);
cam_yaw = 0.0f; // y-rotation in degrees
cam_pitch = 0.0f;
cam_roll = 0.0;
}
Camera::Camera(int view_mat_location, int proj_mat_location) {
this->view_mat_location = view_mat_location;
this->proj_mat_location = proj_mat_location;
cam_pos = vec3 (0.0f, 0.0f, 5.0f);
near = 0.1f; // clipping plane
far = 100.0f; // clipping plane
fovy = 67.0f; // 67 degrees
// aspect ratio
aspect = (float)g_gl_width / (float)g_gl_height;
proj_mat = perspective (fovy, aspect, near, far);
cam_speed = 5.0f; // 1 unit per second
cam_heading_speed = 100.0f; // 30 degrees per second
cam_heading = 0.0f; // y-rotation in degrees
T = translate (
identity_mat4 (), vec3 (-cam_pos.v[0], -cam_pos.v[1], -cam_pos.v[2])
);
create_versor (quaternion, -cam_heading, 0.0f, 1.0f, 0.0f);
// convert the quaternion to a rotation matrix (just an array of 16 floats)
quat_to_mat4 (R.m, quaternion);
// combine the inverse rotation and transformation to make a view matrix
view_mat = R * T;
fwd = FORWARD;
rgt = RIGHT;
up = UP;
set_view();
set_proj();
reset_control();
}
void skyUpdate(Skybox *sky){
//calculate new sky ngle
GLfloat quat[] = {0.0f,0.0f,0.0f,0.0f};
sky->angle += 0.002f;
if (sky->angle> 359) sky->angle= 0;
create_versor(quat, sky->angle, 0.0f, 1.0f, 0.0f);
quat_to_mat4(sky->modelMatrix.m, quat);
}
void Camera::roll_right(double elapsed_seconds) {
cam_roll += cam_heading_speed * elapsed_seconds;
cam_moved = true;
float q_roll[16];
create_versor (q_roll, cam_roll, fwd.v[0], fwd.v[1], fwd.v[2]);
mult_quat_quat (quaternion, q_roll, quaternion);
// recalc axes to suit new orientation
recalc_axes();
}
void Camera::yaw_right(double elapsed_seconds) {
cam_yaw -= cam_heading_speed * elapsed_seconds;
cam_moved = true;
float q_yaw[16];
create_versor (q_yaw, cam_yaw, up.v[0], up.v[1], up.v[2]);
mult_quat_quat (quaternion, q_yaw, quaternion);
// recalc axes to suit new orientation
recalc_axes();
}
void Camera::pitch_up(double elapsed_seconds) {
cam_pitch += cam_heading_speed * elapsed_seconds;
cam_moved = true;
float q_pitch[16];
create_versor (
q_pitch, cam_pitch, rgt.v[0], rgt.v[1], rgt.v[2]
);
mult_quat_quat (quaternion, q_pitch, quaternion);
// recalc axes to suit new orientation
recalc_axes();
}
void GLCamera::movePitchDown(double elapsed_seconds)
{
cam_pitch -= cam_heading_speed * elapsed_seconds;
float q_pitch[16];
create_versor(q_pitch, cam_pitch, rgt.v[0], rgt.v[1], rgt.v[2]);
mult_quat_quat(quaternion, q_pitch, quaternion);
// recalc axes to suit new orientation
quat_to_mat4(R.m, quaternion);
fwd = R * vector4(0.0, 0.0, -1.0, 0.0);
rgt = R * vector4(1.0, 0.0, 0.0, 0.0);
up = R * vector4(0.0, 1.0, 0.0, 0.0);
}
void Camera::yaw_left(double elapsed_seconds) {
cam_yaw += cam_heading_speed * elapsed_seconds;
cam_moved = true;
// create a quaternion representing change in heading (the yaw)
float q_yaw[16];
create_versor (q_yaw, cam_yaw, up.v[0], up.v[1], up.v[2]);
// add yaw rotation to the camera's current orientation
mult_quat_quat (quaternion, q_yaw, quaternion);
// recalc axes to suit new orientation
recalc_axes();
}
void GLCamera::rollRight(double elapsed_seconds)
{
cam_roll += cam_heading_speed * elapsed_seconds;
float q_roll[16];
create_versor(q_roll, cam_roll, fwd.v[0], fwd.v[1], fwd.v[2]);
mult_quat_quat(quaternion, q_roll, quaternion);
// recalc axes to suit new orientation
quat_to_mat4(R.m, quaternion);
fwd = R * vector4(0.0, 0.0, -1.0, 0.0);
rgt = R * vector4(1.0, 0.0, 0.0, 0.0);
up = R * vector4(0.0, 1.0, 0.0, 0.0);
}
void GLCamera::moveYawLeft(double elapsed_seconds)
{
cam_yaw += getHeadingSpeed() * elapsed_seconds;
// create a quaternion representing change in heading (the yaw)
float q_yaw[16];
create_versor(q_yaw, cam_yaw, up.v[0], up.v[1], up.v[2]);
// add yaw rotation to the camera's current orientation
mult_quat_quat(quaternion, q_yaw, quaternion);
// recalc axes to suit new orientation
quat_to_mat4(R.m, quaternion);
fwd = R * vector4(0.0, 0.0, -1.0, 0.0);
rgt = R * vector4(1.0, 0.0, 0.0, 0.0);
up = R * vector4(0.0, 1.0, 0.0, 0.0);
}
void GLCamera::setPosition(vector3 pos)
{
this->cam_pos = pos;
T = identity_mat4().translate(vector3(-cam_pos.v[0], -cam_pos.v[1], -cam_pos.v[2]));
T = identity_mat4().translate( vector3(-cam_pos.v[0], -cam_pos.v[1], -cam_pos.v[2]) );
create_versor(quaternion, -cam_heading, 0.0f, 1.0f, 0.0f);
quat_to_mat4(R.m, quaternion);
// combine the inverse rotation and transformation to make a view matrix
view_mat = R * T;
// keep track of some useful vectors that can be used for keyboard movement
fwd = vector4(0.0f, 0.0f, -1.0f, 0.0f);
rgt = vector4(1.0f, 0.0f, 0.0f, 0.0f);
up = vector4(0.0f, 1.0f, 0.0f, 0.0f);
cam_yaw = 0.0f; // y-rotation in degrees
cam_pitch = 0.0f;
cam_roll = 0.0;
}