-static float ktimestep = 1.0f/60.0f;
-
-static void player_freecam(void)
-{
- m4x3f cam_rot;
- m4x3_identity( cam_rot );
- m4x3_rotate_y( cam_rot, -player.look_dir[0] );
- m4x3_rotate_x( cam_rot, -player.look_dir[1] );
-
- v3f lookdir = { 0.0f, 0.0f, -1.0f },
- sidedir = { 1.0f, 0.0f, 0.0f };
-
- m4x3_mulv( cam_rot, lookdir, lookdir );
- m4x3_mulv( cam_rot, sidedir, sidedir );
-
- float movespeed = 5.0f;
- static v2f mouse_last,
- view_vel = { 0.0f, 0.0f };
-
- static v3f move_vel = { 0.0f, 0.0f, 0.0f };
-
- if( vg_get_button_down( "primary" ) )
- v2_copy( vg_mouse, mouse_last );
- else if( vg_get_button( "primary" ) )
- {
- v2f delta;
- v2_sub( vg_mouse, mouse_last, delta );
- v2_copy( vg_mouse, mouse_last );
-
- v2_muladds( view_vel, delta, 0.005f, view_vel );
- }
-
- v2_muls( view_vel, 0.75f, view_vel );
- v2_add( view_vel, player.look_dir, player.look_dir );
- player.look_dir[1] =
- vg_clampf( player.look_dir[1], -VG_PIf*0.5f, VG_PIf*0.5f );
-
- if( vg_get_button( "forward" ) )
- v3_muladds( move_vel, lookdir, ktimestep * movespeed, move_vel );
- if( vg_get_button( "back" ) )
- v3_muladds( move_vel, lookdir, ktimestep *-movespeed, move_vel );
- if( vg_get_button( "left" ) )
- v3_muladds( move_vel, sidedir, ktimestep *-movespeed, move_vel );
- if( vg_get_button( "right" ) )
- v3_muladds( move_vel, sidedir, ktimestep * movespeed, move_vel );
-
- v3_muls( move_vel, 0.75f, move_vel );
- v3_add( move_vel, player.view, player.view );
-
-}
-
-static void apply_gravity( v3f vel, float const timestep )
-{
- v3f gravity = { 0.0f, -9.6f, 0.0f };
- v3_muladds( vel, gravity, timestep, vel );
-}
-
-static void player_start_air(void)
-{
- player.in_air = 1;
-
- float pstep = ktimestep*10.0f;
-
- float best_velocity_mod = 0.0f,
- best_velocity_delta = -9999.9f;
-
- v3f targetn;
-
- v3f axis, vup;
- m3x3_mulv( player.to_world, (v3f){0.0f,1.0f,0.0f}, vup );
- v3_cross( vup, player.v, axis );
- v3_normalize( axis );
- player.land_log_count = 0;
-
- m3x3_identity( player.vr );
-
- for( int m=0;m<=5; m++ )
- {
- float vmod = ((float)m / 5.0f)*0.15f;
-
- v3f pco, pco1, pv;
- v3_copy( player.co, pco );
- v3_copy( player.v, pv );
-
- /*
- * Try different 'rotations' of the velocity to find the best possible
- * landing normal. This conserves magnitude at the expense of slightly
- * unrealistic results
- */
-
- m3x3f vr;
- v4f vr_q;
-
- q_axis_angle( vr_q, axis, vmod );
- q_m3x3( vr_q, vr );
-
- for( int i=0; i<50; i++ )
- {
- v3_copy( pco, pco1 );
- apply_gravity( pv, pstep );
-
- m3x3_mulv( vr, pv, pv );
- v3_muladds( pco, pv, pstep, pco );
-
- vg_line( pco, pco1, i&0x1?0xff000000:0xffffffff );
-
- v3f sh;
- v3_copy( pco, sh );
- int hit = sample_scene_height( &world.geo, sh, targetn );
-
- if( sh[1] >= pco[1] && hit )
- {
- float land_delta = v3_dot( pv, targetn );
-
- if( (land_delta < 0.0f) && (land_delta > best_velocity_delta) )
- {
- best_velocity_delta = land_delta;
- best_velocity_mod = vmod;
-
- v3_copy( sh, player.land_target );
-
- q_axis_angle( vr_q, axis, vmod*0.1f );
- q_m3x3( vr_q, player.vr );
- }
- v3_copy( sh, player.land_target_log[player.land_log_count ++] );
- break;
- }
- }
- }
-
- //v3_rotate( player.v, best_velocity_mod, axis, player.v );
-
- return;
- v3_muls( player.v, best_velocity_mod, player.v );
-}
-
-static int sample_if_resistant( v3f pos )
-{
- v3f ground, norm;
- v3_copy( pos, ground );
-
- if( sample_scene_height( &world.geo, ground, norm ) )
- {
- v3f angle;
- v3_copy( player.v, angle );
- v3_normalize( angle );
- float resistance = v3_dot( norm, angle );
-
- if( resistance < 0.25f )
- {
- v3_copy( ground, pos );
- return 1;
- }
- }
-
- return 0;
-}
-
-static void player_physics_ground(void)
-{
- /*
- * Getting surface collision points,
- * the contact manifold is a triangle for simplicity.
- */
- v3f contact_front, contact_back, fwd, fwd1, contact_norm, vup, vside,
- axis;
-
- m3x3_mulv( player.to_world, (v3f){ 0.0f, 0.0f,-1.0f}, fwd );
- m4x3_mulv( player.to_world, (v3f){ 0.15f,0.0f,-0.6f}, contact_norm );
- m4x3_mulv( player.to_world, (v3f){-0.15f,0.0f,-0.6f}, contact_front );
- m4x3_mulv( player.to_world, (v3f){ 0.00f,0.0f, 0.6f}, contact_back );
- m3x3_mulv( player.to_world, (v3f){ 0.0f, 1.0f, 0.0f}, vup );
- m3x3_mulv( player.to_world, (v3f){ 1.0f, 0.0f, 0.0f}, vside );
-
- v3f cn0, cn1, cn2;
-
- int contact_count =
- sample_if_resistant( contact_front ) +
- sample_if_resistant( contact_back ) +
- sample_if_resistant( contact_norm );
-
- if( contact_count < 3 )
- {
- player_start_air();
- return;
- }
-
- v3f norm;
- v3f v0, v1;
- v3_sub( contact_norm, contact_front, v0 );
- v3_sub( contact_back, contact_front, v1 );
- v3_cross( v1, v0, norm );
- v3_normalize( norm );
-
- vg_line( contact_norm, contact_front, 0xff00ff00 );
- vg_line( contact_back, contact_front, 0xff0000ff );
-
- /* Surface alignment */
- float angle = v3_dot( vup, norm );
- v3_cross( vup, norm, axis );
-
- if( angle < 0.999f )
- {
- v4f correction;
- q_axis_angle( correction, axis, acosf(angle) );
- q_mul( correction, player.rot, player.rot );
- }
-
- float resistance = v3_dot( norm, player.v );
-
- if( resistance >= 0.0f )
- {
- player_start_air();
- return;
- }
- else
- {
- v3_muladds( player.v, norm, -resistance, player.v );
- }
-
- /* This is where velocity integration used to be */
-
- float slip = 0.0f;
-
- player.co[1] = (contact_front[1]+contact_back[1])*0.5f;
-
- v3f vel;
- m3x3_mulv( player.to_local, player.v, vel );
-
- /* Calculate local forces */
-
- slip = (-vel[0] / vel[2]) * player.vswitch;
- if( fabsf( slip ) > 1.2f )
- slip = vg_signf( slip ) * 1.2f;
- player.slip = slip;
-
-#if 0
- if( player.slip_last*slip < 0.0f && fabsf(slip) > 0.7f )
- {
- vg_warn( "SWITCH\n" );
- player.vswitch = -player.vswitch;
- slip = -slip;
- }
-
- player.slip_last = slip;
-#endif
-
- float substep = ktimestep * 0.2f;
-
- for( int i=0; i<5; i++ )
- {
- if( fabsf(vel[2]) >= 0.02f*substep )
- vel[2] += vg_signf( vel[2] ) * -0.02f * substep;
- if( fabsf(vel[0]) >= 7.0f*substep )
- vel[0] += vg_signf( vel[0] ) * -7.0f * substep;
- }
-
- m3x3_mulv( player.to_world, vel, player.v );
-
- if( vg_get_button( "yawl" ) )
- player.iY += 3.6f * ktimestep;
- if( vg_get_button( "yawr" ) )
- player.iY -= 3.6f * ktimestep;
-
- float steer = vg_get_axis( "horizontal" );
- player.iY -= vg_signf(steer)*powf(steer,2.0f) * 1.5f * ktimestep;
-}
-
-static void draw_cross(v3f pos,u32 colour)
-{
- v3f p0, p1;
- v3_add( (v3f){ 1.0f,0.0f,0.0f}, pos, p0 );
- v3_add( (v3f){-1.0f,0.0f,0.0f}, pos, p1 );
- vg_line( p0, p1, colour );
- v3_add( (v3f){0.0f, 1.0f,0.0f}, pos, p0 );
- v3_add( (v3f){0.0f,-1.0f,0.0f}, pos, p1 );
- vg_line( p0, p1, colour );
- v3_add( (v3f){0.0f,0.0f, 1.0f}, pos, p0 );
- v3_add( (v3f){0.0f,0.0f,-1.0f}, pos, p1 );
- vg_line( p0, p1, colour );
-}
-
-static void player_physics_air(void)
-{
- /* Debug prediciton */
-
- m3x3_mulv( player.vr, player.v, player.v );
- for( int i=0; i<player.land_log_count; i++ )
- draw_cross( player.land_target_log[i], 0xff00ffff );
-
- draw_cross( player.land_target, 0xff0000ff );
-
- v3f ground_pos, ground_norm;
- v3_copy( player.co, ground_pos );
-
- if( sample_scene_height( &world.geo, ground_pos, ground_norm ) )
- {
- if( ground_pos[1] > player.co[1] )
- {
- player.in_air = 0;
- return;
- }
- }
-
- /* Prediction
- *
- * TODO: Find best landing surface and guide player towords it
- */
- float pstep = ktimestep*10.0f;
-
- v3f pco, pco1, pv;
- v3_copy( player.co, pco );
- v3_copy( player.v, pv );
-
- v3f targetn;
- for( int i=0; i<50; i++ )
- {
- v3_copy( pco, pco1 );
- apply_gravity( pv, pstep );
- v3_muladds( pco, pv, pstep, pco );
-
- vg_line( pco, pco1, i&0x1?0xff000000:0xffffffff );
-
- v3f sh;
- v3_copy( pco, sh );
- int hit = sample_scene_height( &world.geo, sh, targetn );
-
- if( sh[1] >= pco[1] && hit )
- {
- v3f localup;
- m3x3_mulv( player.to_world, (v3f){0.0f,1.0f,0.0f}, localup );
-
- float angle = v3_dot( localup, targetn );
- v3f axis;
- v3_cross( localup, targetn, axis );
-
- if( angle < 0.99f )
- {
- v4f correction;
- q_axis_angle( correction, axis, acosf(angle)*0.05f );
- q_mul( correction, player.rot, player.rot );
- }
-
- draw_cross( sh, 0xffff0000 );
-
- break;
- }
- }
-
- player.iY -= vg_get_axis( "horizontal" ) * 3.6f * ktimestep;
-}
-
-static void player_animate(void);
-static void player_update(void)