4cade/src/ui.attract.shr.a

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;license:MIT
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;(c) 2018-2021 by 4am & qkumba
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;
; Super hi-res slideshows
;
; Public functions
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; - SHRSlideshow
; - SHRSingle
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;
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;------------------------------------------------------------------------------
; SHRSlideshow
; execute a slideshow of super hi-res artwork
;
; safe to call if machine can not display super hi-res graphics (does nothing
; and exits)
;
; in: none
; out: everything clobbered
; graphics mode reset to display hi-res screen, which is blank
;------------------------------------------------------------------------------
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SHRSlideshow
lda MachineStatus ; only show SHR on IIgs or if we have a VidHD card
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and #SUPPORTS_SHR
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beq SHRRTS
jsr LoadSHRTransition
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jsr okvs_iter
!word gSlideshowStore
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!word SHRArtworkCallback
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beq jmpblank ; always taken
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;------------------------------------------------------------------------------
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; SHRSingle
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; display a single super hi-res artwork
;
; safe to call if machine can not display super hi-res graphics (does nothing
; and exits)
;
; in: none
; out: everything clobbered
; graphics mode reset to display hi-res screen, which is blank
;------------------------------------------------------------------------------
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SHRSingle
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+ST16 IndexedSHRFilename
lda MachineStatus ; only show SHR on IIgs or if we have a VidHD card
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and #SUPPORTS_SHR
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beq SHRRTS
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jsr BlankSHR
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jsr LoadIndexedSHRFile
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jsr DecompressSHR
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jsr LoadSHRTransition
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jsr ExecuteTransitionAtA000AndWait
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jmpblank
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jmp BlankHGR
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;------------------------------------------------------------------------------
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; LoadSHGRTransition [private]
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; load the SHR transition effect code (currently always the same file)
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;
; in: none
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; out: all registers and flags clobbered
; $A000..$BFFF/main contains transition effect code
;------------------------------------------------------------------------------
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LoadSHRTransition
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jsr LoadFile
!word kFXDirectory
!word kSFXFizzleFile
!word $A000
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SHRRTS rts
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;------------------------------------------------------------------------------
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; SHRArtworkCallback [private]
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; callback called by okvs_iter on gSlideshowStore
; to load and display a single SHR graphic
; in: A/Y contains address of filename (name only, path is always /ARTWORK.SHR/)
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; $WINDEX contains 0-based index of the current record in gSlideshowStore (word)
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; 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
;------------------------------------------------------------------------------
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SHRArtworkCallback
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bit KBD
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bmi SHRRTS
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+ST16 IndexedSHRFilename
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jsr FindGame
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; 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
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bcs SHRRTS
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+LD16 WINDEX ; save game index in case user hits RETURN
+ST16 gGameToLaunch ; while it's visible (we'll launch it)
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jsr BlankSHR
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jsr LoadIndexedSHRFile
jsr DecompressSHR
jmp ExecuteTransitionAtA000AndWait
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LoadIndexedSHRFile
; in: caller has populated IndexedSHRFilename
; out: all flags & registers clobbered
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jsr LoadFile ; load index file into $2000
!word kRootDirectory
!word kSHRArtworkIndexFile
- !word $2000
jsr okvs_find
!word -
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IndexedSHRFilename
!word $FDFD ; SMC
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+ST16 @indexRecordPtr
jsr LoadIndexedFile ; load compressed SHR artwork at $1FF8/main (not aux)
!word kSHRArtworkDataFile
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!word $1FF8
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@indexRecordPtr
!word $FDFD ; SMC
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rts
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;------------------------------------------------------------------------------
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; BlankSHR [private]
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; clear and show SHR mode without flickering
;
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; in: Machine is a IIgs or has a VidHD card that responds appropriately to
; IIgs-specific softswitches for graphics and memory modes.
; NOTE: THIS ROUTINE WILL CRASH ON AN APPLE //C due to writing to $C029,
; so it is imperative that the caller ensures the machine type.
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; Thanks to John Brooks for explaining all of this to me. Twice.
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; out: text page clobbered (but screen holes preserved)
; $2000..$9FFF/aux cleared
;------------------------------------------------------------------------------
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BlankSHR
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jsr Home
lda #%01000001 ; set GS NEWVIDEO mode to turn on linearize
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sta NEWVIDEO
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sta WRITEAUXMEM ; writes go to auxmem
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ldx #$00 ; enable auxmem-to-bank-E1 shadowing on IIgs
stx SHADOW
; VIDHD-SPECIFIC HACK HERE!
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; On the II/II+/IIe, all $C03x addresses are aliases for $C030, i.e. the speaker.
; Any single access of the speaker register requires a second access within a short
; time to balance the level if we want to avoid an audible click, which we do here.
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; Since we can't read from SHADOW before writing to it (it returns random values on
; 8-bit machines, which VidHD interprets as invalid graphic modes and crashes hard),
; we instead balance the speaker access with a second write to the same speaker-
; aliased softswitch. Do not remove.
stx SHADOW
lsr ; clear $2000..$9FFF in auxmem
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ldx #$80
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jsr ClearMem
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sta WRITEMAINMEM ; writes go to main memory
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lda #%11000001 ; set GS NEWVIDEO mode to turn on SHR mode
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sta NEWVIDEO
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rts