mirror of https://github.com/a2-4am/4cade.git
120 lines
4.2 KiB
Plaintext
120 lines
4.2 KiB
Plaintext
;license:MIT
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;(c) 2018-2020 by 4am
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;
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; GR action slideshows
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;
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; Public functions
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; - GRActionSlideshow
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; - GRSingle
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;
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;------------------------------------------------------------------------------
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; GRActionSlideshow
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; display a slideshow of lo-res action screenshots
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;
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; in: none
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; out: everything clobbered
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; graphics mode set to display hi-res screen
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;------------------------------------------------------------------------------
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GRActionSlideshow
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jsr LoadGRTransition ; load transition effect code at $6000
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jsr BlankGR ; switch GR mode with initial blank screen
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jsr okvs_iter ; cycle through all listed GR files
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!word gSlideshowStore
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!word GRActionCallback ; address of callback (called on each file)
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jmp BlankHGR ; switch back to HGR mode with initial blank screen on exit
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;------------------------------------------------------------------------------
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; GRSingle
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; display a single lo-res screenshot, with transition effect
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;
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; in: none
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; out: everything clobbered
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; graphics mode set to display hi-res screen
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;------------------------------------------------------------------------------
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GRSingle
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+ST16 IndexedGRFilename
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jsr BlankGR ; switch to GR mode with initial blank screen
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jsr LoadIndexedGRFile ; load GR screen at $4000
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jsr LoadGRTransition ; load transition effect code at $6000
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jsr ExecuteTransitionAt6000AndWait
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jmp BlankHGR ; switch back to HGR mode with initial blank screen on exit
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;------------------------------------------------------------------------------
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; BlankGR [private]
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; clear and show GR page 1 without flickering
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;
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; in: none
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; out: text page clobbered
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; graphics mode set to display lo-res screen
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;------------------------------------------------------------------------------
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BlankGR
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ldy #$2C ; BIT
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sty PageFrom
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ldx #$04
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stx PageTo+2
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lda #0
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jsr ClearGR
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bit PAGE1
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bit $C056 ; set GR mode
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jmp GRMode
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;------------------------------------------------------------------------------
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; LoadGRTransition [private]
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;
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; in: none
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; out: all registers and flags clobbered
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; $6000..$BFFF/main contains transition effect code (probably not all
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; of that, but no promises)
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;------------------------------------------------------------------------------
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LoadGRTransition
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jsr LoadIndexedFile
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!word $6000
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!word kGRFizzleRecord
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GRRTS rts
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;------------------------------------------------------------------------------
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; GRActionCallback [private]
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; callback called by okvs_iter on gSlideshowStore
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; to load and display a single GR action screenshot
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; in: A/Y contains address of filename (name only, path is always /ACTION.GR/)
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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
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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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;------------------------------------------------------------------------------
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GRActionCallback
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bit KBD
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bmi GRRTS
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+ST16 IndexedGRFilename
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jsr FindGame
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; if game name is not found (C will be set here), it means the game
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; can't be played due to memory or joystick requirements, so we hide
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; it from slideshows
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bcs GRRTS
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jsr LoadIndexedGRFile
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jmp ExecuteTransitionAt6000AndWait
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LoadIndexedGRFile
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; in: caller has set IndexedGRFilename
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; out: all flags & registers clobbered
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jsr LoadIndexedFile ; load index file into $4600
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- !word $4600
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!word kGRActionIndexRecord
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jsr okvs_find
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!word -
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IndexedGRFilename
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!word $FDFD ; SMC
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+ST16 @indexRecordPtr
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jsr LoadIndexedFile ; load GR screenshot at $4000
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!word $4000 ; because that's where the transition code expects to find it
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@indexRecordPtr
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!word $FDFD ; SMC
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rts
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