/*!
Draws a fog plane at the far clipping plane to mask out clipping of terrain.
\return none
\author jfpatry
\date Created: 2000-08-31
\date Modified: 2000-08-31
*/
void draw_fog_plane()
{
plane_t left_edge_plane, right_edge_plane;
plane_t left_clip_plane, right_clip_plane;
plane_t far_clip_plane;
plane_t bottom_clip_plane;
plane_t bottom_plane, top_plane;
scalar_t course_width, course_length;
scalar_t course_angle, slope;
point_t left_pt, right_pt, pt;
point_t top_left_pt, top_right_pt;
point_t bottom_left_pt, bottom_right_pt;
vector_t left_vec, right_vec;
scalar_t height;
GLfloat *fog_colour;
if ( is_fog_on() == False ) {
return;
}
set_gl_options( FOG_PLANE );
get_course_dimensions( &course_width, &course_length );
course_angle = get_course_angle();
slope = tan( ANGLES_TO_RADIANS( course_angle ) );
left_edge_plane = make_plane( 1.0, 0.0, 0.0, 0.0 );
right_edge_plane = make_plane( -1.0, 0.0, 0.0, course_width );
far_clip_plane = get_far_clip_plane();
left_clip_plane = get_left_clip_plane();
right_clip_plane = get_right_clip_plane();
bottom_clip_plane = get_bottom_clip_plane();
/* Find the bottom plane */
bottom_plane.nml = make_vector( 0.0, 1, -slope );
height = get_terrain_base_height( 0 );
/* Unoptimized version
pt = make_point( 0, height, 0 );
bottom_plane.d = -( pt.x * bottom_plane.nml.x +
pt.y * bottom_plane.nml.y +
pt.z * bottom_plane.nml.z );
*/
bottom_plane.d = -height * bottom_plane.nml.y;
/* Find the top plane */
top_plane.nml = bottom_plane.nml;
height = get_terrain_max_height( 0 );
top_plane.d = -height * top_plane.nml.y;
if(get_player_data(local_player())->view.mode == TUXEYE)
{
bottom_clip_plane.nml = make_vector( 0.0, 1, -slope );
height = get_terrain_base_height( 0 ) - 40;
bottom_clip_plane.d = -height * bottom_clip_plane.nml.y;
}
/* Now find the bottom left and right points of the fog plane */
if ( !intersect_planes( bottom_plane, far_clip_plane, left_clip_plane, &left_pt ) )
return;
if ( !intersect_planes( bottom_plane, far_clip_plane, right_clip_plane, &right_pt ) )
return;
if ( !intersect_planes( top_plane, far_clip_plane, left_clip_plane, &top_left_pt ) )
return;
if ( !intersect_planes( top_plane, far_clip_plane, right_clip_plane, &top_right_pt ) )
return;
if ( !intersect_planes( bottom_clip_plane, far_clip_plane, left_clip_plane, &bottom_left_pt ) )
return;
if ( !intersect_planes( bottom_clip_plane, far_clip_plane, right_clip_plane, &bottom_right_pt ) )
return;
left_vec = subtract_points( top_left_pt, left_pt );
right_vec = subtract_points( top_right_pt, right_pt );
/* Now draw the fog plane */
set_gl_options( FOG_PLANE );
fog_colour = get_fog_colour();
glColor4fv( fog_colour );
#ifdef __APPLE__DISABLED__
#undef glEnableClientState
#undef glDisableClientState
#undef glVertexPointer
#undef glColorPointer
#undef glDrawArrays
point_t pt1,pt2,pt3,pt4;
pt1 = move_point( top_left_pt, left_vec );
pt2 = move_point( top_right_pt, right_vec );
pt3 = move_point( top_left_pt, scale_vector( 3.0, left_vec ) );
pt4 = move_point( top_right_pt, scale_vector( 3.0, right_vec ) );
const GLfloat verticesFog []=
{
bottom_left_pt.x, bottom_left_pt.y, bottom_left_pt.z,
bottom_right_pt.x, bottom_right_pt.y, bottom_right_pt.z,
left_pt.x, left_pt.y, left_pt.z,
right_pt.x, right_pt.y, right_pt.z,
top_left_pt.x, top_left_pt.y, top_left_pt.z,
top_right_pt.x, top_right_pt.y, top_right_pt.z,
pt1.x, pt1.y, pt1.z,
pt2.x, pt2.y, pt2.z,
pt3.x, pt3.y, pt3.z,
pt4.x, pt4.y, pt4.z
};
const GLfloat colorsFog []=
{
fog_colour[0], fog_colour[1], fog_colour[2], fog_colour[3],
fog_colour[0], fog_colour[1], fog_colour[2], fog_colour[3],
fog_colour[0], fog_colour[1], fog_colour[2], fog_colour[3],
fog_colour[0], fog_colour[1], fog_colour[2], fog_colour[3],
fog_colour[0], fog_colour[1], fog_colour[2], 0.9 ,
fog_colour[0], fog_colour[1], fog_colour[2], 0.9 ,
fog_colour[0], fog_colour[1], fog_colour[2], 0.3 ,
fog_colour[0], fog_colour[1], fog_colour[2], 0.3 ,
fog_colour[0], fog_colour[1], fog_colour[2], 0.0 ,
fog_colour[0], fog_colour[1], fog_colour[2], 0.0 ,
};
glEnableClientState (GL_VERTEX_ARRAY);
// glEnableClientState (GL_COLOR_ARRAY);
// glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glVertexPointer (3, GL_FLOAT , 0, verticesFog);
glColorPointer(4, GL_FLOAT, 0, colorsFog);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 10);
//glDisableClientState(GL_COLOR_ARRAY_POINTER);
#else
glBegin( GL_QUAD_STRIP );
glVertex3f( bottom_left_pt.x, bottom_left_pt.y, bottom_left_pt.z );
glVertex3f( bottom_right_pt.x, bottom_right_pt.y, bottom_right_pt.z );
glVertex3f( left_pt.x, left_pt.y, left_pt.z );
glVertex3f( right_pt.x, right_pt.y, right_pt.z );
glColor4f( fog_colour[0], fog_colour[1], fog_colour[2], 0.9 );
glVertex3f( top_left_pt.x, top_left_pt.y, top_left_pt.z );
glVertex3f( top_right_pt.x, top_right_pt.y, top_right_pt.z );
glColor4f( fog_colour[0], fog_colour[1], fog_colour[2], 0.3 );
pt = move_point( top_left_pt, left_vec );
glVertex3f( pt.x, pt.y, pt.z );
pt = move_point( top_right_pt, right_vec );
glVertex3f( pt.x, pt.y, pt.z );
glColor4f( fog_colour[0], fog_colour[1], fog_colour[2], 0.0 );
pt = move_point( top_left_pt, scale_vector( 3.0, left_vec ) );
glVertex3f( pt.x, pt.y, pt.z );
pt = move_point( top_right_pt, scale_vector( 3.0, right_vec ) );
glVertex3f( pt.x, pt.y, pt.z );
glEnd();
#endif
}
void update_view( player_data_t *plyr, scalar_t dt )
{
point_t view_pt;
vector_t view_dir, up_dir, vel_dir, view_vec;
scalar_t ycoord;
scalar_t course_angle;
vector_t axis;
matrixgl_t rot_mat;
vector_t y_vec;
vector_t mz_vec;
vector_t vel_proj;
quaternion_t rot_quat;
scalar_t speed;
vector_t vel_cpy;
scalar_t time_constant_mult;
vel_cpy = plyr->vel;
speed = normalize_vector( &vel_cpy );
time_constant_mult = 1.0 /
min( 1.0,
max( 0.0,
( speed - NO_INTERPOLATION_SPEED ) /
( BASELINE_INTERPOLATION_SPEED - NO_INTERPOLATION_SPEED )));
up_dir = make_vector( 0, 1, 0 );
vel_dir = plyr->vel;
normalize_vector( &vel_dir );
course_angle = get_course_angle();
switch( plyr->view.mode ) {
case TUXEYE:
{
scalar_t f = 2;
vector_t v = plyr->plane_nml;
scalar_t n = 1.;
view_pt = plyr->pos;
view_pt.x += v.x / n * 0.3;
view_pt.y += v.y / n * 0.3;
view_pt.y += 0.1;
view_pt.z += v.z / n * 0.3;
if(plyr->control.flip_factor || plyr->control.barrel_roll_factor) {
matrixgl_t mat1, mat;
vector_t right;
scalar_t n = sqrt(plyr->viewdir_for_tuxeye.x * plyr->viewdir_for_tuxeye.x + plyr->viewdir_for_tuxeye.y * plyr->viewdir_for_tuxeye.y + plyr->viewdir_for_tuxeye.z * plyr->viewdir_for_tuxeye.z);
plyr->viewdir_for_tuxeye.x /= n;
plyr->viewdir_for_tuxeye.y /= n;
plyr->viewdir_for_tuxeye.z /= n;
n = sqrt(plyr->updir_for_tuxeye.x * plyr->updir_for_tuxeye.x + plyr->updir_for_tuxeye.y * plyr->updir_for_tuxeye.y + plyr->updir_for_tuxeye.z * plyr->updir_for_tuxeye.z);
plyr->updir_for_tuxeye.x /= n;
plyr->updir_for_tuxeye.y /= n;
plyr->updir_for_tuxeye.z /= n;
right = cross_product(plyr->updir_for_tuxeye, plyr->viewdir_for_tuxeye);
make_rotation_about_vector_matrix( mat1, right, jump_from_time(plyr->control.flip_factor) * 360 );
make_rotation_about_vector_matrix( mat, plyr->viewdir_for_tuxeye, jump_from_time(plyr->control.barrel_roll_factor) * 360 );
multiply_matrices(mat, mat1, mat);
view_dir = transform_vector(mat, plyr->viewdir_for_tuxeye);
up_dir = transform_vector(mat, plyr->updir_for_tuxeye);
}
else {
view_dir = plyr->direction;
view_dir.y += 0.1;
view_dir.x = (plyr->view.dir.x * f + view_dir.x) / (f + 1);
view_dir.y = (plyr->view.dir.y * f + view_dir.y) / (f + 1);
view_dir.z = (plyr->view.dir.z * f + view_dir.z) / (f + 1);
plyr->viewdir_for_tuxeye = view_dir;
up_dir = plyr->plane_nml;
up_dir.x = (plyr->view.up.x * f + up_dir.x) / (f + 1);
up_dir.y = (plyr->view.up.y * f + up_dir.y) / (f + 1);
up_dir.z = (plyr->view.up.z * f + up_dir.z) / (f + 1);
plyr->updir_for_tuxeye = up_dir;
}
break;
}
case BEHIND:
{
/* Camera-on-a-string mode */
/* Construct vector from player to camera */
view_vec = make_vector( 0,
sin( ANGLES_TO_RADIANS(
course_angle -
CAMERA_ANGLE_ABOVE_SLOPE +
PLAYER_ANGLE_IN_CAMERA ) ),
cos( ANGLES_TO_RADIANS(
course_angle -
CAMERA_ANGLE_ABOVE_SLOPE +
PLAYER_ANGLE_IN_CAMERA ) ) );
view_vec = scale_vector( CAMERA_DISTANCE, view_vec );
y_vec = make_vector( 0.0, 1.0, 0.0 );
mz_vec = make_vector( 0.0, 0.0, -1.0 );
vel_proj = project_into_plane( y_vec, vel_dir );
normalize_vector( &vel_proj );
/* Rotate view_vec so that it places the camera behind player */
rot_quat = make_rotation_quaternion( mz_vec, vel_proj );
view_vec = rotate_vector( rot_quat, view_vec );
/* Construct view point */
view_pt = move_point( plyr->pos, view_vec );
/* Make sure view point is above terrain */
ycoord = find_y_coord( view_pt.x, view_pt.z );
if ( view_pt.y < ycoord + MIN_CAMERA_HEIGHT ) {
view_pt.y = ycoord + MIN_CAMERA_HEIGHT;
}
/* Interpolate view point */
if ( plyr->view.initialized ) {
/* Interpolate twice to get a second-order filter */
int i;
for (i=0; i<2; i++) {
view_pt =
interpolate_view_pos( plyr->pos, plyr->pos,
MAX_CAMERA_PITCH, plyr->view.pos,
view_pt, CAMERA_DISTANCE, dt,
BEHIND_ORBIT_TIME_CONSTANT *
time_constant_mult );
}
}
/* Make sure interpolated view point is above terrain */
ycoord = find_y_coord( view_pt.x, view_pt.z );
if ( view_pt.y < ycoord + ABSOLUTE_MIN_CAMERA_HEIGHT ) {
view_pt.y = ycoord + ABSOLUTE_MIN_CAMERA_HEIGHT;
}
/* Construct view direction */
view_vec = subtract_points( view_pt, plyr->pos );
axis = cross_product( y_vec, view_vec );
normalize_vector( &axis );
make_rotation_about_vector_matrix( rot_mat, axis,
PLAYER_ANGLE_IN_CAMERA );
view_dir = scale_vector( -1.0,
transform_vector( rot_mat, view_vec ) );
/* Interpolate orientation of camera */
if ( plyr->view.initialized ) {
/* Interpolate twice to get a second-order filter */
int i;
for (i=0; i<2; i++) {
interpolate_view_frame( plyr->view.up, plyr->view.dir,
&up_dir, &view_dir, dt,
BEHIND_ORIENT_TIME_CONSTANT );
up_dir = make_vector( 0.0, 1.0, 0.0 );
}
}
break;
}
case FOLLOW:
{
/* Camera follows player (above and behind) */
up_dir = make_vector( 0, 1, 0 );
/* Construct vector from player to camera */
view_vec = make_vector( 0,
sin( ANGLES_TO_RADIANS(
course_angle -
CAMERA_ANGLE_ABOVE_SLOPE +
PLAYER_ANGLE_IN_CAMERA ) ),
cos( ANGLES_TO_RADIANS(
course_angle -
CAMERA_ANGLE_ABOVE_SLOPE +
PLAYER_ANGLE_IN_CAMERA ) ) );
view_vec = scale_vector( CAMERA_DISTANCE, view_vec );
y_vec = make_vector( 0.0, 1.0, 0.0 );
mz_vec = make_vector( 0.0, 0.0, -1.0 );
vel_proj = project_into_plane( y_vec, vel_dir );
normalize_vector( &vel_proj );
/* Rotate view_vec so that it places the camera behind player */
rot_quat = make_rotation_quaternion( mz_vec, vel_proj );
view_vec = rotate_vector( rot_quat, view_vec );
/* Construct view point */
view_pt = move_point( plyr->pos, view_vec );
/* Make sure view point is above terrain */
ycoord = find_y_coord( view_pt.x, view_pt.z );
if ( view_pt.y < ycoord + MIN_CAMERA_HEIGHT ) {
view_pt.y = ycoord + MIN_CAMERA_HEIGHT;
}
/* Interpolate view point */
if ( plyr->view.initialized ) {
/* Interpolate twice to get a second-order filter */
int i;
for ( i=0; i<2; i++ ) {
view_pt =
interpolate_view_pos( plyr->view.plyr_pos, plyr->pos,
MAX_CAMERA_PITCH, plyr->view.pos,
view_pt, CAMERA_DISTANCE, dt,
FOLLOW_ORBIT_TIME_CONSTANT *
time_constant_mult );
}
}
/* Make sure interpolate view point is above terrain */
ycoord = find_y_coord( view_pt.x, view_pt.z );
if ( view_pt.y < ycoord + ABSOLUTE_MIN_CAMERA_HEIGHT ) {
view_pt.y = ycoord + ABSOLUTE_MIN_CAMERA_HEIGHT;
}
/* Construct view direction */
view_vec = subtract_points( view_pt, plyr->pos );
axis = cross_product( y_vec, view_vec );
normalize_vector( &axis );
make_rotation_about_vector_matrix( rot_mat, axis,
PLAYER_ANGLE_IN_CAMERA );
view_dir = scale_vector( -1.0,
transform_vector( rot_mat, view_vec ) );
/* Interpolate orientation of camera */
if ( plyr->view.initialized ) {
/* Interpolate twice to get a second-order filter */
int i;
for ( i=0; i<2; i++ ) {
interpolate_view_frame( plyr->view.up, plyr->view.dir,
&up_dir, &view_dir, dt,
FOLLOW_ORIENT_TIME_CONSTANT );
up_dir = make_vector( 0.0, 1.0, 0.0 );
}
}
break;
}
case ABOVE:
{
/* Camera always uphill of player */
up_dir = make_vector( 0, 1, 0 );
/* Construct vector from player to camera */
view_vec = make_vector( 0,
sin( ANGLES_TO_RADIANS(
course_angle -
CAMERA_ANGLE_ABOVE_SLOPE+
PLAYER_ANGLE_IN_CAMERA ) ),
cos( ANGLES_TO_RADIANS(
course_angle -
CAMERA_ANGLE_ABOVE_SLOPE+
PLAYER_ANGLE_IN_CAMERA ) ) );
view_vec = scale_vector( CAMERA_DISTANCE, view_vec );
/* Construct view point */
view_pt = move_point( plyr->pos, view_vec );
/* Make sure view point is above terrain */
ycoord = find_y_coord( view_pt.x, view_pt.z );
if ( view_pt.y < ycoord + MIN_CAMERA_HEIGHT ) {
view_pt.y = ycoord + MIN_CAMERA_HEIGHT;
}
/* Construct view direction */
view_vec = subtract_points( view_pt, plyr->pos );
make_rotation_matrix( rot_mat, PLAYER_ANGLE_IN_CAMERA, 'x' );
view_dir = scale_vector( -1.0,
transform_vector( rot_mat, view_vec ) );
break;
}
default:
code_not_reached();
}
/* Create view matrix */
plyr->view.pos = view_pt;
plyr->view.dir = view_dir;
plyr->view.up = up_dir;
plyr->view.plyr_pos = plyr->pos;
plyr->view.initialized = True;
setup_view_matrix( plyr );
}
