;;-*-Lisp-*-
(in-package goal)

;; name: main.gc
;; name in dgo: main
;; dgos: ENGINE, GAME

;; DECOMP BEGINS

(defun set-letterbox-frames ((arg0 time-frame))
  "Set the remaining time until letterboxing is removed.
   This uses the current clock ratio of the process and the game-clock.
   This overrides any previous letterboxing."
  (with-pp
    (set! (-> *game-info* letterbox-time)
          (+ (-> *display* base-clock frame-counter)
             (the int (/ (* (the float arg0) (-> *display* game-clock clock-ratio)) (-> pp clock clock-ratio)))
             )
          )
    (none)
    )
  )

(defun letterbox ()
  "Draw letterbox bars."
  (let* ((s5-0 (-> *display* frames (-> *display* on-screen) global-buf))
         (gp-0 (-> s5-0 base))
         )
    (draw-sprite2d-xy-absolute s5-0 0 0 512 46 (new 'static 'rgba :a #x80))
    (draw-sprite2d-xy-absolute s5-0 0 370 512 47 (new 'static 'rgba :a #x80))
    (let ((a3-2 (-> s5-0 base)))
      (let ((v1-7 (the-as dma-packet (-> s5-0 base))))
        (set! (-> v1-7 dma) (new 'static 'dma-tag :id (dma-tag-id next)))
        (set! (-> v1-7 vif0) (new 'static 'vif-tag))
        (set! (-> v1-7 vif1) (new 'static 'vif-tag))
        (set! (-> s5-0 base) (the-as pointer (&+ v1-7 16)))
        )
      (dma-bucket-insert-tag
        (-> *display* frames (-> *display* on-screen) bucket-group)
        (bucket-id screen-filter)
        gp-0
        (the-as (pointer dma-tag) a3-2)
        )
      )
    )
  (none)
  )

(defun set-blackout-frames ((arg0 time-frame))
  "Set the remaining time until blackout is removed.
   Unlike letterbox, this only can increase the time, unless
   you request 0, in which case blackout is disabled immediately"
  (with-pp
    (if (zero? arg0)
        (set! (-> *game-info* blackout-time) (-> *display* base-clock frame-counter))
        (set! (-> *game-info* blackout-time)
              (the-as time-frame
                (max (-> *game-info* blackout-time)
                  (+ (-> *display* base-clock frame-counter)
                     (the int (/ (* (the float arg0) (-> *display* game-clock clock-ratio)) (-> pp clock clock-ratio)))
                     arg0
                     )
                  )
                )
              )
        )
    (none)
    )
  )

(defun blackout ()
  "Draw blackout over the whole screen.
   This isn't used - instead they adjust some GS setting to fade the whole
   screen to black, which is much faster than drawing over the entire screen."
  (let* ((s5-0 (-> *display* frames (-> *display* on-screen) global-buf))
         (gp-0 (-> s5-0 base))
         )
    (draw-sprite2d-xy-absolute s5-0 0 0 512 416 (new 'static 'rgba :a #x80))
    (let ((a3-1 (-> s5-0 base)))
      (let ((v1-6 (the-as object (-> s5-0 base))))
        (set! (-> (the-as dma-packet v1-6) dma) (new 'static 'dma-tag :id (dma-tag-id next)))
        (set! (-> (the-as dma-packet v1-6) vif0) (new 'static 'vif-tag))
        (set! (-> (the-as dma-packet v1-6) vif1) (new 'static 'vif-tag))
        (set! (-> s5-0 base) (&+ (the-as pointer v1-6) 16))
        )
      (dma-bucket-insert-tag
        (-> *display* frames (-> *display* on-screen) bucket-group)
        (bucket-id debug-no-zbuf2)
        gp-0
        (the-as (pointer dma-tag) a3-1)
        )
      )
    )
  (none)
  )

(defun paused? ()
  "Are we paused, or in some menu that should make us pause?"
  (or (= *master-mode* 'pause) (= *master-mode* 'progress) (= *master-mode* 'menu) (= *master-mode* 'freeze))
  )

(defun movie? ()
  "Are we in a movie?"
  (logtest? (-> *kernel-context* prevent-from-run) (process-mask movie))
  )

(defun demo? ()
  "Are we a demo version?"
  (or (= *kernel-boot-message* 'demo) (= *kernel-boot-message* 'demo-shared))
  )

;; the "master-mode" is a single "mode" for the game:
;; - 'game: normal play
;; - 'pause: select pause (with PAUSE on screen)
;; - 'freeze: a pause, but without PAUSE on screen
;; - 'menu: debug menu system open
;; - 'progress: progress menu open (start menu)

(define *last-master-mode* 'game)

(defun set-master-mode ((arg0 symbol))
  "Change the master mode, updating pause masks in the kernel/sound system as needed."
  (when (!= arg0 *master-mode*)
    (set! *last-master-mode* *master-mode*)
    (set! *master-mode* arg0)

    ;; transition stuff:
    (case *master-mode*
      (('pause)
       ;; entering pause, set pause bit in masks
       (if (not *debug-pause*)
           (logior! (-> *setting-control* user-default process-mask) (process-mask pause))
           )
       (logclear! (-> *setting-control* user-default process-mask) (process-mask freeze menu))
       (set! *pause-lock* #f)
       (sound-group-pause (sound-group sfx music dialog sog3 ambient dialog2 sog6 sog7))
       (set! (-> *game-info* pause-start-time) (-> *display* real-clock frame-counter))
       )
      (('freeze)
       (logior! (-> *setting-control* user-default process-mask) (process-mask freeze))
       (logclear! (-> *setting-control* user-default process-mask) (process-mask pause menu))
       (sound-group-pause (sound-group sfx ambient))
       (set! (-> *game-info* pause-start-time) (-> *display* real-clock frame-counter))
       )
      (('menu)
       (logior! (-> *setting-control* user-default process-mask) (process-mask menu))
       (logclear! (-> *setting-control* user-default process-mask) (process-mask freeze pause progress))
       (sound-group-pause (sound-group sfx music dialog sog3 ambient dialog2 sog6 sog7))
       (set! *pause-lock* #f)
       )
      (('progress)
       ;; entering progress, start the process
       (logclear! (-> *setting-control* user-default process-mask) (process-mask freeze pause menu))
       (sound-group-pause (sound-group sfx music dialog sog3 ambient dialog2 sog6 sog7))
       (when (not *progress-process*)
         (activate-progress *dproc* 'main)
         (if (not *progress-process*) ;; process didn't start, back to game.
             (set-master-mode 'game)
             )
         )
       (set! (-> *game-info* pause-start-time) (-> *display* real-clock frame-counter))
       )
      (('game)
       (logclear! (-> *setting-control* user-default process-mask) (process-mask freeze pause menu))
       (sound-group-continue (sound-group sfx music dialog sog3 ambient dialog2 sog6 sog7))
       )
      )

    ;; update from setting-control to kernel
    (apply-settings *setting-control*)
    )

  ;; tell the debug menu system we changed modes.
  (if *debug-segment*
      (menu-respond-to-pause)
      )
  0
  (none)
  )

(defun pause-allowed? ()
  "Are you allowed to pause?"
  (not (or (< (-> *display* base-clock frame-counter) (-> *game-info* blackout-time))
           (!= (-> *setting-control* user-current bg-a) 0.0)
           (!= (-> *setting-control* user-current bg-a-force) 0.0)
           (not (-> *setting-control* user-current allow-pause))
           (handle->process (-> *game-info* auto-save-proc))
           (= *master-mode* 'freeze)
           (not *target*)
           *master-exit*
           (not *common-text*)
           )
       )
  )

(defun toggle-pause ()
  "Update the current master mode because a pause has been requested.
   This can reject the transition, or decide to go to any mode."
  (case *master-mode*
    (('game)
     (set-master-mode
       (cond
         ((and (logtest? (-> *cpad-list* cpads 0 valid) 128)
               *target*
               (>= (-> *display* base-clock frame-counter) (-> *game-info* blackout-time))
               (= (-> *setting-control* user-current bg-a) 0.0)
               (and (= (-> *setting-control* user-current bg-a-force) 0.0)
                    (< (seconds 1003) (-> *display* real-clock frame-counter))
                    )
               )
          ;; in 'game, controller fell out, target is spawned, can pause if it's allowed, and not in progress.
          (if (or *progress-process* (not (-> *setting-control* user-current allow-pause)))
              *master-mode*
              'pause
              )
          )
         ;; game -> debug menu when pressing select/start with L3.
         ((and (cpad-pressed? 0 select start) (cpad-hold? 0 l3) *debug-segment*)
          'menu
          )
         ;; select in debug pauses (also check R2 here for the frame-advance feature)
         ((and (or (cpad-hold? 0 select) (cpad-hold? 0 r2)) *debug-segment*)
          'pause
          )
         ;; not debugging, not pressing start, should pause if possible
         ((and (not *debug-segment*) (zero? (logand (-> *cpad-list* cpads 0 button0-abs 0) (pad-buttons start))))
          (if (pause-allowed?)
              'pause
              *master-mode* ;; and if we can't, reject
              )
          )
         ;; if we can't open progress, fall back to pause
         ((not (progress-allowed?))
          (if (pause-allowed?)
              'pause
              *master-mode* ;; otherwise reject
              )
          )
         ((cpad-hold? 0 start) ;; finally, if we're pressing start and pausing is impossible, open progress
          'progress
          )
         (else
           *master-mode* ;; otherwise reject
           )
         )
       )
     )
    (('menu)
     (set-master-mode (cond
                        ((and *debug-segment* (cpad-hold? 0 l3) (cpad-pressed? 0 select start))
                         'menu
                         )
                        ((cpad-hold? 0 select r2)
                         (if *debug-segment*
                             'pause
                             *master-mode*
                             )
                         )
                        ((cpad-hold? 0 r3 r2 triangle circle)
                         'game
                         )
                        ((cpad-hold? 0 start)
                         'game
                         )
                        (else
                          *master-mode*
                          )
                        )
                      )
     (set! *pause-lock* #f)
     )
    (('pause)
     (set-master-mode (cond
                        ((and (cpad-pressed? 0 select start) (cpad-hold? 0 l3) *debug-segment*)
                         'menu
                         )
                        ((and (not *debug-segment*) (cpad-hold? 0 select))
                         'game
                         )
                        ((and *cheat-mode* (cpad-hold? 0 select r2))
                         'game
                         )
                        ((cpad-hold? 0 start)
                         'game
                         )
                        (else
                          *master-mode*
                          )
                        )
                      )
     (set! *pause-lock* (and *cheat-mode* (cpad-hold? 0 r2)))
     )
    (('freeze)
     (set-master-mode (if (and (cpad-pressed? 0 select start) (cpad-hold? 0 l3) *debug-segment*)
                          'menu
                          *master-mode*
                          )
                      )
     )
    (('progress)
     (if (cpad-hold? 0 start)
         (hide-progress-screen)
         )
     (set! *pause-lock* (and *cheat-mode* (cpad-hold? 0 r2)))
     )
    )
  0
  )

;; TODO screen filter

(define *cheat-temp* (the-as (pointer int32) (malloc 'global 20)))
(define *master-exit* #f)
(define *progress-cheat* #f)
(define *first-boot* #t)

;; TODO cheats

;; Rough loop outline:
;; (while *run*
;;    - suspend                                          ;; runs actors
;;    - display-loop-main                                ;; runs the drawing/per frame updates
;;       - per-frame updates for level, global effets
;;       - draw-hook                                     ;; generates DMA data
;;       - sync-path                                     ;; waits for previous frame to finish render
;;       - end-display
;;       - swap-display
;;          - display-frame-finish
;;          - display-sync
;;             - display-frame-start
;;    )

(defun end-display ((arg0 display))
  "Update debug drawing:
    - debug draws (triangles, spheres, etc)
    - profile bars
    - file info
    - console
    - other info (iop, memcard, pause)

  This function runs after DMA sync.
  It's not clear why they did this - in the Jak 1 PC port, it is fine to move this to before sync.
  Possibly they wanted to leave the bus alone for graphics DMA."

  ;; DMA buffer for memory usage counting.
  (let ((s5-0 (-> (if *debug-segment*
                      (-> arg0 frames (-> arg0 on-screen) debug-buf)
                      (-> arg0 frames (-> arg0 on-screen) global-buf)
                      )
                  base
                  )
              )
        )

    ;; debug draw, profile bars, deci count, file info
    (when *debug-segment*
      ;; do all debug drawing.
      (debug-draw-buffers)
      (with-dma-buffer-add-bucket ((s3-0 (-> arg0 frames (-> arg0 on-screen) debug-buf)) (bucket-id debug-no-zbuf2))
        (when (or *display-profile* *stats-profile-bars*)
          (setup-categories! (-> arg0 frames (-> arg0 on-screen) profile-array))
          (let ((a2-0 7))
            (if *display-profile*
                (draw-bars! *profile-array* s3-0 a2-0)
                )
            )
          (if (and (!= *master-mode* 'menu) *stats-profile-bars*)
              (draw-text! *profile-array*)
              )
          )
        (when *display-deci-count*
          (let ((s2-0 draw-string-xy))
            (format (clear *temp-string*) "~D" *deci-count*)
            (s2-0 *temp-string* s3-0 448 210 (font-color default-#cddbcd) (font-flags shadow))
            )
          )
        (display-file-info)
        )
      )

    ;; draw console buffer
    (let ((buf (if *debug-segment*
                     (-> arg0 frames (-> arg0 on-screen) debug-buf)
                     (-> arg0 frames (-> arg0 on-screen) global-buf)
                     )
                 )
           )
      (with-dma-buffer-add-bucket ((s3-0 buf) (bucket-id debug-no-zbuf2))
      (if (and (= *master-mode* 'pause)
               (and (!= *cheat-mode* 'camera) (or (zero? *screen-shot-work*) (= (-> *screen-shot-work* count) -1)))
               )
          (draw-string-xy
            (lookup-text! *common-text* (game-text-id pause) #f)
            buf
            256
            (if (< (-> *display* base-clock frame-counter) (-> *game-info* letterbox-time))
                352
                320
                )
            (font-color precursor-#ec3b00)
            (font-flags shadow kerning middle large)
            )
          )
      (let ((s2-2 (the int (-> *font-context* origin y))))
        (cond
          ((or (movie?) (< (-> *display* base-clock frame-counter) (-> *game-info* letterbox-time)))
           (+! s2-2 56)
           )
          (*display-profile*
            (+! s2-2 48)
            )
          )
        (when (or (zero? *screen-shot-work*) (= (-> *screen-shot-work* count) -1))
          (let* ((v1-82
                   (draw-string-xy
                     *stdcon0*
                     buf
                     (the int (-> *font-context* origin x))
                     s2-2
                     (font-color default-#cddbcd)
                     (font-flags shadow)
                     )
                   )
                 (a3-6 (+ s2-2 (the int (* 2.0 (the-as float (-> v1-82 b))))))
                 )
            (draw-string-xy
              *stdcon1*
              buf
              (the int (-> *font-context* origin x))
              a3-6
              (font-color default-#cddbcd)
              (font-flags shadow)
              )
            )
          )
        )
      (if *display-iop-info*
          (show-iop-info buf)
          )
      (if *display-memcard-info*
          (show-mc-info buf)
          )
        )
      )
    (let ((v1-101 *dma-mem-usage*))
      (when (nonzero? v1-101)
        (set! (-> v1-101 length) (max 88 (-> v1-101 length)))
        (set! (-> v1-101 data 87 name) "debug")
        (+! (-> v1-101 data 87 count) 1)
        (+! (-> v1-101 data 87 used) (&-
                                       (-> (if *debug-segment*
                                               (-> arg0 frames (-> arg0 on-screen) debug-buf)
                                               (-> arg0 frames (-> arg0 on-screen) global-buf)
                                               )
                                           base
                                           )
                                       (the-as uint s5-0)
                                       )
            )
        (set! (-> v1-101 data 87 total) (-> v1-101 data 87 used))
        )
      )
    )
  (set! *stdcon* (clear *stdcon0*))
  0
  (none)
  )

(defun display-loop-main ((arg0 display))
  "Run the engine.
   This function is called after actors update."
  (local-vars (a0-94 int) (a0-96 int))
  (with-pp

    ; ;; LOAD LEVEL
    (if (-> *level* loading-level)
        (load-continue (-> *level* loading-level))
        )

    ; ;; Run blerc to modify foreground models
    ; (with-profiler 'merc *profile-merc-color*
    ;   (blerc-execute)
    ;   (blerc-init)
    ;   )

    ; ;; Run other merc effects that modify vertices
    ; (texscroll-execute)
    ; (ripple-execute)
    ; (region-execute)

    ;; final call to update joints before drawing.
    ; (with-profiler 'joints *profile-joints-color*
    ;   (execute-math-engine)
    ;   )

    ;; execute the debug hook before doing the big updates
    (with-profiler 'debug *profile-debug-color*
      (let* ((s5-5 *debug-hook*)
             (t9-12 (car s5-5)))
        (while (not (null? s5-5))
          ((the-as (function none) t9-12))
          (set! s5-5 (cdr s5-5))
          (set! t9-12 (car s5-5))
          )
        )
      ; (main-cheats)
      )

    ;; using the position of the in-game camera, update visiblity and matrices for rendering.
    (with-profiler 'camera *profile-camera-color*
      (update-camera)
      )

    ;; map texture stuff
    ; (update *bigmap*)

    ;; continue loading level
    (if (-> *level* loading-level)
        (load-continue (-> *level* loading-level))
        )

    ;; drawing - this runs foreground/background drawing.
    (with-profiler 'draw-hook *profile-draw-hook-color*
      (*draw-hook*)
      )

    ;; another level load
    (if (-> *level* loading-level)
        (load-continue (-> *level* loading-level))
        )

    ; (if *display-color-bars*
    ;     (draw-color-bars)
    ;     )

    ;; draw and update menus
    (with-profiler 'menu-hook *profile-menu-hook-color*
      (*menu-hook*)
      )

    ;; load text files as needed from the menu update
    (load-level-text-files -1)

    ;; post-processing filter drawing
    ; (if (-> *screen-filter* draw?)
    ;     (draw *screen-filter*)
    ;     )

    ;; letterbox drawing
    ; (when (or (movie?) (< (-> *display* base-clock frame-counter) (-> *game-info* letterbox-time)))
    ;   (if (< (-> *game-info* letterbox-time) (-> *display* base-clock frame-counter))
    ;       (set! (-> *game-info* letterbox-time) (-> *display* base-clock frame-counter))
    ;       )
    ;   (if (and (= (-> *setting-control* user-current aspect-ratio) 'aspect4x3)
    ;            (or (zero? *screen-shot-work*) (= (-> *screen-shot-work* count) -1))
    ;            )
    ;       (letterbox)
    ;       )
    ;   )

    ;; blackout drawing
    ; (when (-> *setting-control* user-current render)
    ;   (if (< (-> *display* base-clock frame-counter) (-> *game-info* blackout-time))
    ;       (set! (-> *setting-control* user-default bg-a-force) 1.0)
    ;       (set! (-> *setting-control* user-default bg-a-force) 0.0)
    ;       )
    ;   )

    ;; generate DMA data for doing the main blit
    ; (blit-displays)

    ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
    ;; END of normal frame
    ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

    ;; and we're done with the main frame! end profiling/stat collection
    (when *debug-segment*
      (let ((s5-13 (-> arg0 frames (-> arg0 on-screen) profile-array data 0)))
        (when (and *dproc* *debug-segment*)
          (let* ((v1-294 (+ (-> s5-13 depth) -1))
                 (s4-12 (-> s5-13 segment v1-294))
                 (s3-12 (-> s5-13 base-time))
                 )
            (when (>= v1-294 0)
              (set! (-> s4-12 end-time) (the-as int (- (timer-count (the-as timer-bank #x10000800)) (the-as uint s3-12))))
              (+! (-> s5-13 depth) -1)
              )
            )
          )
        )
      0
      (read! (-> *perf-stats* data (perf-stat-bucket all-code)))
      )

    ;; now wait for the previous frame to finish rendering...
    (when (nonzero? (sync-path 0 0))
      (*dma-timeout-hook*)
      (reset-vif1-path)
      )

    ;; debug drawing
    (end-display arg0)

    ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
    ;; display the frame, and start a new one!
    ;; this will kick off the next dma transfer
    (swap-display arg0)
    ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;


    ;; start profiling for the new frame
    (when *debug-segment*
      (start-frame! (-> arg0 frames (-> arg0 on-screen) profile-array data 0))
      ;(reset! (-> *perf-stats* data (perf-stat-bucket all-code)))
      )

    ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
    ;; START of next frame
    ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

    ;; a few things before the actor updates...

    (set! (-> *time-of-day-context* title-updated) #f)

    ;; update teleport counter
    ; (set! *teleport* #f)
    ; (when (nonzero? *teleport-count*)
    ;   (set! *teleport* #t)
    ;   (set! *teleport-count* (+ *teleport-count* -1))
    ;   )

    ;; update particles (we're racing the DMA transfer again, do this asap)
    (let ((gp-1 (-> pp clock)))
      (set! (-> pp clock) (-> *display* part-clock))
      (process-particles)
      (set! (-> pp clock) gp-1)
      )

    ;; set up VU0's VIF for collision code run by actors
    ; (dma-send
    ;   (the-as dma-bank #x10008000)
    ;   (the-as uint (-> *collide-vif0-init* data))
    ;   (the-as uint (/ (-> *collide-vif0-init* length) 4))
    ;   )

    ;; send sound commands to IOP
    ; (swap-sound-buffers (ear-trans 0) (ear-trans 1) (camera-pos) (camera-angle))

    ;; advance streaming animation
    ; (str-play-kick)

    ;; handle spawning/despawning as needed.
    (level-update *level*)

    ;; do some memory card operations, check auto-save
    ; (mc-run)
    ; (auto-save-check)
    (none)
    )
  )

(defbehavior display-loop process ()
  (stack-size-set! (-> self main-thread) 512)

  ;; spawn the matrix process. This is responsible for doing the first pass through joints
  ; (process-spawn-function
  ;   process
  ;   (lambda :behavior process
  ;     ()
  ;     (logclear! (-> self mask) (process-mask freeze pause menu progress entity))
  ;     (until #f
  ;       (when *debug-segment*
  ;         (let ((gp-0 (-> *display* frames (-> *display* on-screen) profile-array data 0))
  ;               (v1-9 'joints)
  ;               (s5-0 *profile-joints-color*)
  ;               )
  ;           (when (and *dproc* *debug-segment*)
  ;             (let ((s4-0 (-> gp-0 data (-> gp-0 count))))
  ;               (let ((s3-0 (-> gp-0 base-time)))
  ;                 (set! (-> s4-0 name) v1-9)
  ;                 (set! (-> s4-0 start-time) (the-as int (- (timer-count (the-as timer-bank #x10000800)) (the-as uint s3-0))))
  ;                 )
  ;               (set! (-> s4-0 depth) (the-as uint (-> gp-0 depth)))
  ;               (set! (-> s4-0 color) s5-0)
  ;               (set! (-> gp-0 segment (-> gp-0 depth)) s4-0)
  ;               )
  ;             (+! (-> gp-0 count) 1)
  ;             (+! (-> gp-0 depth) 1)
  ;             (set! (-> gp-0 max-depth) (max (-> gp-0 max-depth) (-> gp-0 depth)))
  ;             )
  ;           )
  ;         0
  ;         )
  ;       (execute-math-engine)
  ;       (when *debug-segment*
  ;         (let ((gp-1 (-> *display* frames (-> *display* on-screen) profile-array data 0)))
  ;           (when (and *dproc* *debug-segment*)
  ;             (let* ((v1-33 (+ (-> gp-1 depth) -1))
  ;                    (s5-1 (-> gp-1 segment v1-33))
  ;                    (s4-1 (-> gp-1 base-time))
  ;                    )
  ;               (when (>= v1-33 0)
  ;                 (set! (-> s5-1 end-time) (the-as int (- (timer-count (the-as timer-bank #x10000800)) (the-as uint s4-1))))
  ;                 (+! (-> gp-1 depth) -1)
  ;                 )
  ;               )
  ;             )
  ;           )
  ;         0
  ;         )
  ;       (suspend)
  ;       )
  ;     #f
  ;     (none)
  ;     )
  ;   :name "matrix"
  ;   :from *4k-dead-pool*
  ;   :to *mid-pool*
  ;   )
  (let ((gp-1 *display*))
    (set! *teleport* #t)
    (update *setting-control*)
    (init-time-of-day-context *time-of-day-context*)
    (format 0 "about to display-sync~%")
    (display-sync gp-1)
    (format 0 "about to swap-display~%")
    (swap-display gp-1)
    (format 0 "about to install-handler~%")
    (install-handler 3 vblank-handler) ;; TODO: this never gets called.
    ; *touching-list*
    ; ((method-of-type touching-list touching-list-method-10))
    ; (prepare *collide-rider-pool*)
    ; (update-actor-hash)
    ; (blerc-init)
    ; (dma-send
    ;   (the-as dma-bank #x10008000)
    ;   (the-as uint (-> *collide-vif0-init* data))
    ;   (the-as uint (/ (-> *collide-vif0-init* length) 4))
    ;   )
    (suspend)
    (set! (-> *setting-control* user-default bg-a) 0.0)
    (set! (-> gp-1 frames 0 start-time) (the-as time-frame (timer-count (the-as timer-bank #x10000800))))
    (set! (-> gp-1 frames 1 start-time) (the-as time-frame (timer-count (the-as timer-bank #x10000800))))
    (set! (-> gp-1 dog-ratio) 1.0)
    (while *run*
      (display-loop-main gp-1)
      (with-profiler 'actors *profile-actors-color*
        (suspend)
        )
      )
    )
  (set! *dproc* #f)
  (format 0 "display is off #<#x~X>.~%" self)
  0
  )

(defun on ((arg0 symbol))
  "Start the display loop."
  (when (not *dproc*)
    (when (not arg0)
      (if (= (-> *level* level0 status) 'inactive)
          (bg 'halfpipe)
          )
      )
    (set! *run* #t)
    (set! *dproc* (ppointer->process (process-spawn-function
                                       process
                                       display-loop
                                       :name "display"
                                       :from *4k-dead-pool*
                                       :to *display-pool*
                                       :stack *kernel-dram-stack*
                                       )
                                     )
          )
    (format 0 "SKIP: level activation in on~%")
    (cond
      ((or (level-get-with-status *level* 'loaded)
           (level-get-with-status *level* 'alive)
           (level-get-with-status *level* 'active)
           )
       (activate-levels! *level*)
    ;    (when (not arg0)
    ;      (let ((gp-1 (entity-by-type camera-start)))
    ;        (when (and gp-1 (type? gp-1 entity-actor))
    ;          (while (not (camera-teleport-to-entity gp-1))
    ;            (suspend)
    ;            )
    ;          )
    ;        )
    ;      )
    ;    (if (and (= *kernel-boot-message* 'art-group) *kernel-boot-art-group*)
    ;        (anim-tester-add-object *kernel-boot-art-group*)
    ;        )
       )
      (else
        (format 0 "startup failed, killing dproc~%")
        (kill-by-name "display" *active-pool*)
        (set! *dproc* #f)
        )
      )
    )
  *dproc*
  )

(defun off ()
  (stop 'debug)
  (dotimes (gp-0 (-> *level* length))
    (let ((a0-2 (-> *level* level gp-0)))
      (if (= (-> a0-2 status) 'active)
          (deactivate a0-2)
          )
      )
    )
  (set! *run* #f)
  0
  )