+
+ if (this.com_phys_air) {
+ if ((IS_SVQC && time >= PHYS_TELEPORT_TIME(this))
+ || (IS_CSQC && PHYS_WATERJUMP_TIME(this) <= 0)) {
+ // apply air speed limit
+ float airaccelqw = PHYS_AIRACCEL_QW(this);
+ float wishspeed0 = wishspeed;
+ const float maxairspd = this.com_phys_vel_max;
+ wishspeed = min(wishspeed, maxairspd);
+ if (IS_DUCKED(this)) {
+ wishspeed *= 0.5;
+ }
+ float airaccel = this.com_phys_acc_rate_air;
+
+ float accelerating = (this.velocity * wishdir > 0);
+ float wishspeed2 = wishspeed;
+
+ // CPM: air control
+ if (PHYS_AIRSTOPACCELERATE(this)) {
+ vector curdir = normalize(vec2(this.velocity));
+ airaccel += (this.com_phys_acc_rate_air_stop - airaccel) * max(0, -(curdir * wishdir));
+ }
+ // note that for straight forward jumping:
+ // step = accel * PHYS_INPUT_TIMELENGTH * wishspeed0;
+ // accel = bound(0, wishspeed - vel_xy_current, step) * accelqw + step * (1 - accelqw);
+ // -->
+ // dv/dt = accel * maxspeed (when slow)
+ // dv/dt = accel * maxspeed * (1 - accelqw) (when fast)
+ // log dv/dt = logaccel + logmaxspeed (when slow)
+ // log dv/dt = logaccel + logmaxspeed + log(1 - accelqw) (when fast)
+ float strafity = IsMoveInDirection(this.movement, -90) + IsMoveInDirection(this.movement, +90); // if one is nonzero, other is always zero
+ if (PHYS_MAXAIRSTRAFESPEED(this)) {
+ wishspeed =
+ min(wishspeed,
+ GeomLerp(this.com_phys_vel_max_air, strafity, this.com_phys_vel_max_air_strafe));
+ }
+ if (PHYS_AIRSTRAFEACCELERATE(this)) {
+ airaccel = GeomLerp(airaccel, strafity, this.com_phys_acc_rate_air_strafe);
+ }
+ if (PHYS_AIRSTRAFEACCEL_QW(this)) {
+ airaccelqw =
+ (((strafity > 0.5 ? PHYS_AIRSTRAFEACCEL_QW(this) : PHYS_AIRACCEL_QW(this)) >= 0) ? +1 : -1)
+ *
+ (1 - GeomLerp(1 - fabs(PHYS_AIRACCEL_QW(this)), strafity, 1 - fabs(PHYS_AIRSTRAFEACCEL_QW(this))));
+ }
+ // !CPM
+
+ if (PHYS_WARSOWBUNNY_TURNACCEL(this) && accelerating && this.movement.y == 0 && this.movement.x != 0) {
+ PM_AirAccelerate(this, wishdir, wishspeed2);
+ } else {
+ float sidefric = maxairspd ? (PHYS_AIRACCEL_SIDEWAYS_FRICTION(this) / maxairspd) : 0;
+ PM_Accelerate(this, wishdir, wishspeed, wishspeed0, airaccel, airaccelqw,
+ PHYS_AIRACCEL_QW_STRETCHFACTOR(this), sidefric, PHYS_AIRSPEEDLIMIT_NONQW(this));
+ }
+
+ if (PHYS_AIRCONTROL(this)) {
+ CPM_PM_Aircontrol(this, wishdir, wishspeed2);
+ }
+ }
+ } else {
+ if (this.com_phys_ground && IS_DUCKED(this)) { wishspeed *= 0.5; }
+ if (this.com_phys_water) {
+ wishspeed *= 0.7;
+
+ // if (PHYS_WATERJUMP_TIME(this) <= 0) // TODO: use
+ {
+ // water friction
+ float f = 1 - dt * PHYS_FRICTION(this);
+ f = min(max(0, f), 1);
+ this.velocity *= f;
+
+ f = wishspeed - this.velocity * wishdir;
+ if (f > 0) {
+ float accelspeed = min(PHYS_ACCELERATE(this) * dt * wishspeed, f);
+ this.velocity += accelspeed * wishdir;
+ }
+
+ // holding jump button swims upward slowly
+ if (jump && !this.viewloc) {
+ // was:
+ // lava: 50
+ // slime: 80
+ // water: 100
+ // idea: double those
+ this.velocity_z = 200;
+ if (this.waterlevel >= WATERLEVEL_SUBMERGED) {
+ this.velocity_z = PHYS_MAXSPEED(this) * 0.7;
+ }
+ }
+ }
+ if (this.viewloc) {
+ const float addspeed = wishspeed - this.velocity * wishdir;
+ if (addspeed > 0) {
+ const float accelspeed = min(PHYS_ACCELERATE(this) * dt * wishspeed, addspeed);
+ this.velocity += accelspeed * wishdir;
+ }
+ } else {
+ // water acceleration
+ PM_Accelerate(this, wishdir, wishspeed, wishspeed, this.com_phys_acc_rate, 1, 0, 0, 0);
+ }
+ return;
+ }
+ if (this.com_phys_ground) {
+ // apply edge friction
+ const float f2 = vlen2(vec2(this.velocity));
+ if (f2 > 0) {
+ trace_dphitq3surfaceflags = 0;
+ tracebox(this.origin, this.mins, this.maxs, this.origin - '0 0 1', MOVE_NOMONSTERS, this);
+ // TODO: apply edge friction
+ // apply ground friction
+ const int realfriction = (trace_dphitq3surfaceflags & Q3SURFACEFLAG_SLICK)
+ ? PHYS_FRICTION_SLICK(this)
+ : PHYS_FRICTION(this);
+
+ float f = sqrt(f2);
+ f = 1 - dt * realfriction
+ * ((f < PHYS_STOPSPEED(this)) ? (PHYS_STOPSPEED(this) / f) : 1);
+ f = max(0, f);
+ this.velocity *= f;
+ /*
+ Mathematical analysis time!
+
+ Our goal is to invert this mess.
+
+ For the two cases we get:
+ v = v0 * (1 - dt * (PHYS_STOPSPEED(this) / v0) * PHYS_FRICTION(this))
+ = v0 - dt * PHYS_STOPSPEED(this) * PHYS_FRICTION(this)
+ v0 = v + dt * PHYS_STOPSPEED(this) * PHYS_FRICTION(this)
+ and
+ v = v0 * (1 - dt * PHYS_FRICTION(this))
+ v0 = v / (1 - dt * PHYS_FRICTION(this))
+
+ These cases would be chosen ONLY if:
+ v0 < PHYS_STOPSPEED(this)
+ v + dt * PHYS_STOPSPEED(this) * PHYS_FRICTION(this) < PHYS_STOPSPEED(this)
+ v < PHYS_STOPSPEED(this) * (1 - dt * PHYS_FRICTION(this))
+ and, respectively:
+ v0 >= PHYS_STOPSPEED(this)
+ v / (1 - dt * PHYS_FRICTION(this)) >= PHYS_STOPSPEED(this)
+ v >= PHYS_STOPSPEED(this) * (1 - dt * PHYS_FRICTION(this))
+ */
+ }
+ const float addspeed = wishspeed - this.velocity * wishdir;
+ if (addspeed > 0) {
+ const float accelspeed = min(PHYS_ACCELERATE(this) * dt * wishspeed, addspeed);
+ this.velocity += accelspeed * wishdir;
+ }
+ return;
+ }
+
+ if (IS_CSQC ? PHYS_WATERJUMP_TIME(this) <= 0 : time >= PHYS_TELEPORT_TIME(this)) {
+ PM_Accelerate(this, wishdir, wishspeed, wishspeed, this.com_phys_acc_rate, 1, 0, 0, 0);
+ }