;license:MIT
;(c) 2018-9 by 4am
;
; Double hi-res slideshows
;
; Public functions
; - DHGRTitleSlideshow
; - DHGRActionSlideshow
; - DHGRSingle
;

DHGRTitleSlideshow
         bit   MachineStatus         ; only run DHGR slideshow if we have 128K
         bvs   +
         rts
+        jsr   .LoadDHGRTransition   ; load transition effect code at $6000
         jsr   BlankDHGR             ; switch to DHGR mode with initial blank screen
         jsr   okvs_iter             ; cycle through all listed DHGR files
         !word gSlideshowStore
         !word .DHGRTitleCallback    ; address of callback (called on each file)
         jmp   BlankHGR              ; switch back to HGR mode with initial blank screen on exit

DHGRActionSlideshow
         bit   MachineStatus         ; only run DHGR slideshow if we have 128K
         bvs   +
         rts
+        jsr   .LoadDHGRTransition   ; load transition effect code at $6000
         jsr   BlankDHGR             ; switch to DHGR mode with initial blank screen
         jsr   okvs_iter             ; cycle through all listed DHGR files
         !word gSlideshowStore
         !word .DHGRActionCallback   ; address of callback (called on each file)
         jmp   BlankHGR              ; switch back to HGR mode with initial blank screen on exit

DHGRSingle
         bit   MachineStatus         ; only show DHGR screenshots if we have 128K
         bvs   +
         rts
+
         +STAY @fname
         jsr   BlankDHGR             ; switch to DHGR mode with initial blank screen
         jsr   LoadDHRFile           ; load DHGR file at $4000/main and $4000/aux
         !word kRootDirectory
@fname   !word $FDFD                 ; SMC
+        jsr   .LoadDHGRTransition   ; load transition effect code at $6000
         +LDADDR $6000
         jsr   ExecuteTransitionAndWait
         jmp   BlankHGR              ; switch back to HGR mode with initial blank screen on exit

;------------------------------------------------------------------------------
; .LoadDHGRTransition [private]
; looks up name of next DHGR transition effect in DFX.CONF and loads that file
; at $6000

; in:    gDFXStore has been initialized
;        gGlobalPrefsStore has been initialized
; out:   all registers and flags clobbered
;        $6000..$BFFF/main contains transition effect code
;------------------------------------------------------------------------------
.LoadDHGRTransition
         jsr   LoadFile              ; load DHGR transition effects list into $8000
         !word kRootDirectory
         !word kDFXConfFile
-        !word $8000
         jsr   ParseKeyValueList     ; parse DHGR transition effects list into $6000
         !word gDFXStore
         !word -
         !byte 0

         jsr   pref_get              ; get DHGR transition effect from prefs
         !word kNextDFX
         !word gDFXStore
         +STAY @filename             ; A/Y = filename (don't load file yet)
                                     ; X = index of the transition in DFX store
         +LDADDR gDFXStore
         jsr   okvs_next             ; get transition after this one
         +STAY +

         jsr   pref_set              ; update prefs store and save to disk
         !word kNextDFX
+        !word $FDFD                 ; SMC

         jsr   LoadFile              ; now load transition effect code into $6000
         !word kFXDirectory
@filename !word $FDFD                ; SMC
         !word $6000
         rts

;------------------------------------------------------------------------------
; .DHGRTitleCallback [private]
; callback called by okvs_iter on gSlideshowStore
; to load and display a single DHGR title screenshot

; in:    A/Y contains address of filename (name only, path is always /TITLE.DHGR/)
;        X contains 0-based index of the current record in gSlideshowStore
; out:   all registers and flags clobbered
;        $0800..$1EFF preserved (this contains the gSlideshowStore OKVS data)
;        $2000..$BFFF clobbered by graphics data and transition code
;        $2000..$5FFF/aux clobbered
;------------------------------------------------------------------------------
.DHGRTitleCallback
         bit   KBD
         bpl   +
@exit    rts
+
         +STAY @tfname

         jsr   GetGameDisplayName
         ; if game is not found (C will be set here), it means it can't be played on
         ; this machine due to memory or joystick requirements, so we don't display
         ; it in slideshows
         bcs   @exit
         stx   gGameToLaunch

         ; load DHGR screenshot at $4000/main and $4000/aux
         jsr   LoadDHRFile
         !word kDHGRTitleDirectory
@tfname  !word $FDFD

         +LDADDR $6000
         jmp   ExecuteTransitionAndWait

;------------------------------------------------------------------------------
; .DHGRActionCallback [private]
; callback called by okvs_iter on gSlideshowStore
; to load and display a single DHGR action screenshot

; in:    A/Y contains address of filename (name only, path is always /ACTION.DHGR/)
;        X contains 0-based index of the current record in gSlideshowStore
; out:   all registers and flags clobbered
;        $0800..$1EFF preserved (this contains the gSlideshowStore OKVS data)
;        $2000..$BFFF clobbered by graphics data and transition code
;        $2000..$5FFF/aux clobbered
;------------------------------------------------------------------------------
.DHGRActionCallback
         bit   KBD
         bpl   +
@actionExit
         rts
+
         +STAY @afname

         jsr   GetGameDisplayNameInActionSlideshow
         ; if game name is not found (C will be set here), it means the game
         ; can't be played due to memory or joystick requirements, so we hide
         ; it from slideshows
         bcs   @actionExit
         stx   gGameToLaunch

         ; load DHGR screenshot at $4000/main and $4000/aux
         jsr   LoadDHRFile
         !word kDHGRActionDirectory
@afname  !word $FDFD

         +LDADDR $6000
         jmp   ExecuteTransitionAndWait