38  Player Movement & Weapon Sprites

This tour covers movement logic in p_user.c and weapon display in p_pspr.h/c.

38.0.1 p_user.c: Player Movement

  • P_Thrust applies acceleration to the player’s momentum along a given angle (lines 64–68).
  • MAXBOB (lines 48–49) defines view bobbing height.
  • View bob is calculated from squared momentum (lines 88–96).
  • Final view height includes bob offset and ceiling check (lines 136–141).
  • Player direction and ground status are updated (lines 154–158).
  • Movement inputs are converted to momentum via P_Thrust (lines 160–163).
  • Transition to running animation (lines 166–169).
  • P_PlayerThink processes commands and updates state per tick (lines 236–242).

P_PlayerThink also handles: cheat codes, death state, movement, view bobbing, sector effects, weapon switching, use-line actions, weapon animations, and power-up timers.

38.0.2 p_pspr.h and p_pspr.c: Weapon Sprites

  • P_SetupPsprites clears weapon sprite states (lines 831–838).
  • pspdef_t defines overlay sprite structure (lines 68–75 in p_pspr.h).
  • P_MovePsprites updates animation states (lines 851–861).
  • pspdef_t also used in info.c for:
    • animation state (line 138)
    • weapon sprite tracking (line 146)
    • screen position and state control (line 154)

And that was the walkthrough of player movement, view bobbing, and weapon sprite animation.