4cade/src/ui.overlay.a

;License:MIT
;(c) 2018-9 by 4am
;
; routines for drawing the UI overlay (search bar, browse bar, instructions, cheat mode)
; on top of whatever else is on the screen
;
; Public functions
; - DrawUIWithoutDots
; - DrawUI
;
; Public variables
; - VisibleGameCount (set during init)
;

Instructions
         !text "[Type to search, "
         !byte $15                   ; right arrow character
         !text " to browse]  "
VisibleGameCount
         !text "000 games"
ReturnToPlay
         !byte $0D
         !text " to play"

kCheatsEnabled = 3                  ; index of 'cheats enabled' string in following table
kCheatDescriptionLo
         !byte <sNoCheats
         !byte <sInfiniteLives
         !byte <sInfiniteLivesAndWeapons
         !byte <sCheatsEnabled
kCheatDescriptionHi
         !byte >sNoCheats
         !byte >sInfiniteLives
         !byte >sInfiniteLivesAndWeapons
         !byte >sCheatsEnabled
sNoCheats
         !byte 8
         !text "no cheat"
sInfiniteLives
         !byte 18
         !byte $16        ; bolt
         !text " "
         !text "infinite lives"
         !text " "
         !byte $16        ; bolt
sInfiniteLivesAndWeapons
         !byte 28
         !byte $16        ; bolt
         !text " "
         !text "infinite lives & weapons"
         !text " "
         !byte $16        ; bolt
sCheatsEnabled
         !byte 18
         !byte $16        ; bolt
         !text " "
         !text "cheats enabled"
         !text " "
         !byte $16        ; bolt
sCheatDescriptionPrefix
         !byte 2
         !byte $03        ; vertical line
         !text " "
sCheatDescriptionSuffix
         !byte 2
         !text " "
         !byte $03        ; vertical line

;------------------------------------------------------------------------------
; DrawUIWithoutDots/DrawUI
; draw 2- or 4-line UI on the HGR page that is not currently showing, then
; show that HGR page
;
; in:    gGameToLaunch = game index, or #$FF if no game is selected
; out:   all flags and registers clobbered
;------------------------------------------------------------------------------
DrawUIWithoutDots
         lda   #" "
         clc
         bcc   +
DrawUI
         lda   #$7F
         sec
+        sta   @printCursor+1        ; set up cursor printing based on entry point
         php

         ldy   #39
-        lda   #$00                  ; horizontal bar character
         sta   UILine1,y             ; reset UI line 1 to solid bar
         sta   gPathname,y           ; reset cheat UI line 1 to solid bar
         lda   Instructions,y
         sta   UILine2,y             ; copy instructions to UI line 2
         dey
         bpl   -

         ldx   gGameToLaunch
         cpx   #$FF                  ; if no game, nothing more to do on UI line 2
         beq   @doneWithLine2

         +LDADDR gGamesListStore
         jsr   okvs_nth
         jsr   okvs_get_current
                                     ; (PTR) -> game title
         ldy   #0                    ; copy game title into UI line 2
         lda   (PTR),y
         sta   SAVE                  ; title length
         inc   SAVE
-        iny
         cpy   SAVE
         bcc   @printTitleChar
         beq   @printCursor
         lda   #" "
         +HIDE_NEXT_2_BYTES
@printCursor
         lda   #$FD                  ; SMC
         +HIDE_NEXT_2_BYTES
@printTitleChar
         lda   (PTR),y
         sta   UILine2,y
         cpy   #MaxInputLength+1
         bcc   -

         ldx   #8                    ; replace games count with 'to play' label
-        lda   ReturnToPlay,x
         sta   UI_ToPlay,x
         dex
         bpl   -

@doneWithLine2
         bit   gCheatsEnabled
         bpl   @maybeDrawDots        ; if cheat mode is disabled, we don't need
                                     ; any curves or spaces on UI line 1
         ldx   gGameToLaunch
         ldy   gCheatsAvailable,x
         cpx   #$FF
         bne   +
         ldy   #kCheatsEnabled
+
         lda   kCheatDescriptionLo,y
         sta   SAVE
         lda   kCheatDescriptionHi,y
         sta   SAVE+1
                                     ; (SAVE) -> length-prefixed string
                                     ; (game-specific description or 'cheats enabled' message)
         ldy   #0
         lda   (SAVE),y              ; A = string length
         clc
         adc   #4                    ; extra padding (2 on each side)
         sta   @len
         lda   #40
         sec
         sbc   @len
         lsr
         tax
         lda   #$09                  ; rounded bottom-right character
         sta   UILine1,x
         ldy   #1                    ; fill the proper width with spaces
         lda   #$20                  ; space character
-        inx
         sta   UILine1,x
         iny
@len=*+1
         cpy   #$FD                  ; SMC
         bne   -
         lda   #$0C                  ; rounded bottom-left character
         sta   UILine1,x

@maybeDrawDots
         plp
         bcc   @doneHighlight        ; if caller asked for no dots, then we're done building UI line 1

         ldx   #0
         ldy   #0
@dotloop
         iny
         lda   (PTR),y               ; (PTR) still points to game title
         +LOW_ASCII_TO_LOWER
         cmp   InputBuffer,x
         bne   +
         lda   #$11                  ; dot character
         sta   UILine1,y
         inx
         cpx   InputLength           ; if input buffer is exhausted, we're done drawing dots
         beq   @doneHighlight
+        inc   HTAB
         cpy   SAVE                  ; if game name is exhausted, we're done drawing dots
         bne   @dotloop
@doneHighlight

         lda   #22
         sta   VTAB
         lda   OffscreenPage
         ror
         php
         +LDADDR UILine1
         jsr   Draw40Chars           ; draw UI line 1 on offscreen page
         plp
         +LDADDR UILine2
         jsr   Draw40Chars           ; draw UI line 2 on offscreen page

         bit   gCheatsEnabled        ; if cheats are disabled, then we're done drawing UI
         bpl   @uidone
                                     ; (SAVE) still points to length-prefixed cheat description
         ldy   #0
         lda   (SAVE),y              ; A = length of cheat description
         clc
         adc   #4                    ; extra padding (2 on each side)
         sta   gPathname             ; gPathname = length
         tax
         lda   #$07                  ; gPathname+length = top-right rounded corner character
         sta   gPathname,x
         lda   #$06                  ; gPathname+1 = top-left rounded corner character
         sta   gPathname+1
         lda   #20
         sta   VTAB
         lda   OffscreenPage
         ror
         php
         +LDADDR gPathname
         jsr   DrawCenteredString    ; draw cheat UI line 1

         ldx   gGameToLaunch
         ldy   gCheatsAvailable,x
         cpx   #$FF
         bne   +
         ldy   #kCheatsEnabled
+        lda   kCheatDescriptionLo,y
         sta   SAVE
         lda   kCheatDescriptionHi,y
         sta   SAVE+1
                                     ; (SAVE) -> length-prefixed cheat description
         +LDADDR sCheatDescriptionPrefix
         jsr   SetPath
         +LDAY SAVE
         jsr   AddToPath
         +LDADDR sCheatDescriptionSuffix
         jsr   AddToPath
         inc   VTAB
         plp
         +LDADDR gPathname
         jsr   DrawCenteredString    ; draw cheat UI line 2

@uidone  jmp   ShowOtherPage