mirror of https://github.com/a2-4am/4cade.git
120 lines
3.6 KiB
Plaintext
120 lines
3.6 KiB
Plaintext
;license:MIT
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;(c) 2018-9 by 4am
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;
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; Super hi-res slideshows
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;
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; Public functions
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; - SHRArtworkSlideshow
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; - BlankSHR
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;
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SHRArtworkSlideshow
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lda MachineStatus ; only run SHR slideshow on IIgs or if we have a VidHD card
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and #SUPPORTS_SHR
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bne +
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rts
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+ jsr LoadSHRTransition
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jsr okvs_iter
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!word gSlideshowStore
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!word SHRArtworkCallback
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jmp BlankHGR
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;------------------------------------------------------------------------------
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; LoadSHGRTransition
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; [TODO] for now there is only 1 SHR transition so this always load the same file
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; [TODO] but eventually it should look up name of next SHR transition effect in
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; [TODO] SFX.CONF or something and loads that file at $A000
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;
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; in: gSFXStore has been initialized
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; gGlobalPrefsStore has been initialized
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; out: all registers and flags clobbered
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; $A000..$BFFF/main contains transition effect code
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;------------------------------------------------------------------------------
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LoadSHRTransition
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+LDADDR kSFXFizzleFile
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+STAY @file
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+LOAD_FILE kFXDirectory, @file
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rts
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@file !word $FDFD
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kSFXFizzleFile
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!byte @kSFXFizzleFile_e-*-1
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!text "SHR.FIZZLE"
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@kSFXFizzleFile_e
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;------------------------------------------------------------------------------
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; SHRArtworkCallback
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; callback called by okvs_iter on gSlideshowStore
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; to load and display a single SHR graphic
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; in: A/Y contains address of filename (name only, path is always /SHR/)
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; X contains 0-based index of the current record in gSlideshowStore
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; out: all registers and flags clobbered
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; $0800..$1EFF preserved (this contains the gSlideshowStore OKVS data)
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; $2000..$BFFF clobbered by graphics data and transition code
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; $2000..$5FFF/aux clobbered
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;------------------------------------------------------------------------------
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SHRArtworkCallback
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+STAY PTR
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lda $C000
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bpl +
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rts
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+
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stx gCurrentlyVisibleSlideshowIndex
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jsr BlankSHR
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; load SHR artwork at $2000/main (not aux)
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+LDADDR kSHRArtworkDirectory
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jsr SetPath
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+LDAY PTR
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jsr AddToPath
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jsr LoadFile
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jsr $A000
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jmp WaitAfterTransition
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;------------------------------------------------------------------------------
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; BlankSHR
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; clear and show SHR mode without flickering
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;
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; in: machine is a IIgs or has a VidHD card that responds appropriately to
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; IIgs-specific softswitches for graphics and memory modes
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; NOTE: THIS ROUTINE WILL CRASH ON AN APPLE //C due to writing $C029,
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; so it is imperative that the caller ensure the machine type
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; out: text page clobbered (but screen holes preserved)
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; $2000..$9FFF/aux cleared
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;------------------------------------------------------------------------------
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BlankSHR
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jsr Home
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lda $C029 ; set GS NEWVIDEO mode to turn on linearize
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ora #$40
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sta $C029
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sta $C005 ; writes go to auxmem
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lda $C035 ; enable auxmem-to-bank-E1 shadowing on IIgs
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and #$F7
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sta $C035
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lda #$20 ; clear $2000..$9FFF in auxmem
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sta @a+2
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ldx #$80
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lda #0
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tay
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@a sta $2000,y
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iny
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bne @a
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inc @a+2
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dex
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bne @a
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sta $C004 ; writes go to main memory
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lda $C029 ; set GS NEWVIDEO mode to turn on SHR mode
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ora #$81
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sta $C029
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rts
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