First cut at a non-trivial overlay. Pallettes and tile indexes still to be fixed

demos/shell/App.Main.s

@@ -44,15 +44,19 @@ NO_MUSIC            equ        1                       ; turn music + tool loadi
 
                     jsr        MovePlayerToOrigin      ; Put the player at the beginning of the map
                     
+                    jsr        InitOverlay             ; Initialize the status bar
+
                     lda        #DIRTY_BIT_BG0_REFRESH  ; Redraw all of the tiles on the next Render
                     ora        #DIRTY_BIT_BG1_REFRESH
                     tsb        DirtyBits
 
+                    stz        frameCount
                     lda        #$FFFF
                     jsl        Render
 EvtLoop
                     jsl        DoTimers
                     jsl        Render
+                    inc        frameCount
 
                     jsl        ReadControl
                     and        #$007F                  ; Ignore the buttons for now
@@ -340,8 +344,7 @@ DoLoadPic
                     dw         $0222,$0333,$0444,$0888,$09A0,$0680,$0470,$0051
 
 ; SMB
-DefaultPalette      dw         $0E51,$0EDB,$0000,$068F,$0BF1,$00A0,$0EEE,$0777,$0FA4,$0F59,$0E05,$0F30
+DefaultPalette      dw         $0000,$0777,$0F31,$0E51,$00A0,$02E3,$0BF1,$0FA4,$0FD7,$0EE6,$0F59,$068F,$01CE,$09B9,$0EDA,$0EEE
-                    dw         $0680,$0470,$0051
 
 ; Graphics helpers
 
@@ -460,8 +463,9 @@ qtRec               adrl       $0000
                     PUT        App.Msg.s
                     PUT        Actions.s
                     PUT        font.s
-                    PUT        Overlay.s
 
                     PUT        gen/App.TileMapBG0.s
                     PUT        gen/App.TileMapBG1.s
                     PUT        gen/App.TileSetAnim.s
+
+                    PUT        Overlay.s

demos/shell/Overlay.s

@@ -1,102 +1,253 @@
-; Put a single-line overlay to display status information
+; An overlay is a callback from the render to shadow in a range of lines.  At a minimum, the overlay
-Overlay
+; code needs to LDA/STA or TSB slam the data, but an overlay is typically used to draw some graphic
-:top         equ   16
+; on top of the rendered playfield, such as a status bar or in-game message
-             ldy   #$2222
+;
+; This overlay implementation is for a status bar that is 8-lines height that will be used to display some
+; status information.  The interesting bit of this implementation is that it's split into two pieces,
+; a left and right section in order to be able to use the same code for different screen widths, but
+; still keep the content in the cornders while covering the full screen.
+;
+; There are two subroutines that need to be implemented -- one to update the overlay content and a 
+; second to actually render to the screen
 
-             lda   #TopLabel
+; Initialize the overlay be drawin gin static content that will not change over time
-             ldx   #{160*:top+4}
-             jsr   DrawString
-             ldx   #{160*:top+12}
-;             lda   LastTop
-;             jsr   DrawWord
 
-             lda   #BottomLabel
+CHAR_TILE_BASE equ 241     ; set this to the real tile id that starts an ASCII run starting at '0' through 'Z'
-             ldx   #{160*:top+32}
-             jsr   DrawString
-             ldx   #{160*:top+40}
-;             lda   LastBottom
-;             jsr   DrawWord
 
-             lda   #LeftLabel
+; Define the sized of the left and right overlay buffers
-             ldx   #{160*:top+60}
+R_CHAR_COUNT equ   9       ; "TICK:XXX"
-             jsr   DrawString
+L_CHAR_COUNT equ   8       ; "FPS:XXX"
-             ldx   #{160*:top+68}
-;             lda   LastLeft
-;             jsr   DrawWord
 
-             lda   #RightLabel
+; Allocate a single buffer for holding both the left and right overlay characters + masks
-             ldx   #{160*:top+88}
+OVRLY_SPAN  equ   {L_CHAR_COUNT+R_CHAR_COUNT}*4
-             jsr   DrawString
+CHAR_WIDTH  equ   4
-             ldx   #{160*:top+96}
-;             lda   LastRight
-;             jsr   DrawWord
 
+ovrly_buff  ds    OVRLY_SPAN*8
+ovrly_mask  ds    OVRLY_SPAN*8
 
-             lda   #XLabel
+r_line      equ   ovrly_buff+{L_CHAR_COUNT*4}
-             ldx   #{160*{:top+8}+4}
+l_line      equ   ovrly_buff
-             jsr   DrawString
+r_mask      equ   ovrly_mask+{L_CHAR_COUNT*4}
-             ldx   #{160*{:top+8}+12}
+l_mask      equ   ovrly_mask
-             lda   StartX
-             jsr   DrawWord
 
-             lda   #XModLabel
+MASK_OFFSET equ   {ovrly_mask-ovrly_buff}
-             ldx   #{160*{:top+8}+32}
-             jsr   DrawString
-             ldx   #{160*{:top+8}+40}
-             lda   StartXMod164
-             jsr   DrawWord
 
-             lda   #YLabel
+InitOverlay
-             ldx   #{160*{:top+8}+60}
+             lda    #'F'-'0'
-             jsr   DrawString
+             ldy    #l_line+{CHAR_WIDTH*0}
-             ldx   #{160*{:top+8}+68}
+             jsr    _DrawChar
-             lda   StartY
+             lda    #'P'-'0'
-             jsr   DrawWord
+             ldy    #l_line+{CHAR_WIDTH*1}
+             jsr    _DrawChar
+             lda    #'S'-'0'
+             ldy    #l_line+{CHAR_WIDTH*2}
+             jsr    _DrawChar
+             lda    #':'-'0'
+             ldy    #l_line+{CHAR_WIDTH*3}
+             jsr    _DrawChar
 
-             lda   #YModLabel
+             lda    #'T'-'0'
-             ldx   #{160*{:top+8}+88}
+             ldy    #r_line+{CHAR_WIDTH*0}
-             jsr   DrawString
+             jsr    _DrawChar
-             ldx   #{160*{:top+8}+96}
+             lda    #'I'-'0'
-             lda   StartYMod208
+             ldy    #r_line+{CHAR_WIDTH*1}
-             jsr   DrawWord
+             jsr    _DrawChar
+             lda    #'C'-'0'
+             ldy    #r_line+{CHAR_WIDTH*2}
+             jsr    _DrawChar
+             lda    #'K'-'0'
+             ldy    #r_line+{CHAR_WIDTH*3}
+             jsr    _DrawChar
+             lda    #':'-'0'
+             ldy    #r_line+{CHAR_WIDTH*4}
+             jsr    _DrawChar
+             rts
 
+; Update the dynamic content of the overlay
+_num2ascii
+             and   #$000F
+             cmp   #$000A
+             bcc   :out
+             clc
+             adc   #'A'-10
+:out         rts
 
-             lda   #DirtyLabel
+UdtOverlay
-             ldx   #{160*{:top+16}+4}
+             lda   frameCount                       ; reder the FPS value
-             jsr   DrawString
+             xba
-             ldx   #{160*{:top+16}+12}
+             jsr   _num2ascii
-             lda   DirtyBits
+             ldy   #l_line+{CHAR_WIDTH*4}
-             jsr   DrawWord
+             jsr    _DrawChar
 
-             lda   #STWLabel
+             lda   frameCount
-             ldx   #{160*{:top+16}+32}
+             lsr
-             jsr   DrawString
+             lsr
-             ldx   #{160*{:top+16}+48}
+             lsr
-             lda   ScreenTileWidth
+             lsr
-             jsr   DrawWord
+             jsr   _num2ascii
+             ldy   #l_line+{CHAR_WIDTH*5}
+             jsr    _DrawChar
 
-             lda   #STHLabel
+             lda   frameCount
-             ldx   #{160*{:top+16}+68}
+             jsr   _num2ascii
-             jsr   DrawString
+             ldy   #l_line+{CHAR_WIDTH*6}
-             ldx   #{160*{:top+16}+84}
+             jsr    _DrawChar
-             lda   ScreenTileHeight
+
-             jsr   DrawWord
+             lda   OneSecondCounter                   ; reder the number of remaining seconds
+             xba
+             jsr   _num2ascii
+             ldy   #r_line+{CHAR_WIDTH*5}
+             jsr    _DrawChar
+
+             lda   OneSecondCounter
+             lsr
+             lsr
+             lsr
+             lsr
+             jsr   _num2ascii
+             ldy   #r_line+{CHAR_WIDTH*6}
+             jsr    _DrawChar
+
+             lda   OneSecondCounter
+             jsr   _num2ascii
+             ldy   #l_line+{CHAR_WIDTH*7}
+             jsr    _DrawChar
 
              rts
 
-TopLabel     str   'T:'
+; Draw the overlay
-BottomLabel  str   'B:'
+;  A = address of the left edge of the screen
-RightLabel   str   'R:'
+Overlay      ENT
-LeftLabel    str   'L:'
+             phb                                     ; Called via JSL
+             phk
+             plb
 
-XLabel       str   'X:'
+             phd                                     ; save the direct page register
-YLabel       str   'Y:'
-XModLabel    str   'X*'
-YModLabel    str   'Y*'
 
-DirtyLabel   str   'D:'
+             sta   l_addr                            ; save this value (will go into D-reg later)
-STWLabel     str   'STW:'
+             clc
-STHLabel     str   'STH:'
+             adc   #L_CHAR_COUNT*CHAR_WIDTH          ; advance past the left characters
+             sta   m_addr                            ; this is the DP for the TSB slam
+
+             lda   ScreenWidth
+             sec
+             sbc   #R_CHAR_COUNT*CHAR_WIDTH          ; calculate the left edge of the right side
+             clc
+             adc   l_addr                            ; add to the left edge
+             dec
+             sta   r_addr                            ; this is the DP for the right side
+
+; Calculate the TSB slam entry point
+
+             lda   ScreenWidth                       ; subtract the width of all the characters to figure
+             sec                                     ; out what need to be shadowed in the middle
+             sbc   #{R_CHAR_COUNT+L_CHAR_COUNT}*CHAR_WIDTH                                  
+             eor   #$FFFF
+             inc                                     ; get the negative value
+             clc
+             adc   #m_end
+             sta   m_patch+1
+
+             sei
+             _R1W1
+
+             ldy   #8                                ; count the line we're on
+             ldx   #0
+ovrly_loop
+             lda   r_addr
+             tcd                                     ; set the direct page for the right side
+             jmp   r_ovrly                           ; render that line
+r_ovrly_rtn
+
+             lda   m_addr
+             tcd                                     ; set the direct page for the slam in the middle
+             lda   #0                                ; set to zero for TSB slam
+m_patch      jmp   $0000                             ; jump into the slam field  
+m_ovrly_rtn
+
+             lda   l_addr                            ; set the direct page for the left side
+             tcd
+             jmp   l_ovrly
+l_ovrly_rtn
+             clc
+             tdc
+             adc   #160                              ; advance to the next screen line
+             sta   l_addr
+             adc   #{L_CHAR_COUNT*CHAR_WIDTH}
+             sta   m_addr
+             lda   r_addr
+             adc   #160
+             sta   r_addr
+
+             txa
+             adc   #OVRLY_SPAN
+             tax
+
+             dey
+             bne  ovrly_loop
+
+             _R0W0
+             cli
+
+:exit
+             pld                                     ; restore the direct page and bank and return
+             plb
+             rtl
+
+l_addr       ds   2
+m_addr       ds    2
+r_addr       ds    2
 
 
+r_ovrly
+]idx        equ   0
+            lup   16
+            lda   r_line+]idx,x
+            sta   ]idx
+]idx        equ   ]idx+2
+            --^
+            jmp   r_ovrly_rtn                       ; In R1W1, so can't use the stack
 
+l_ovrly
+]idx        equ   0
+            lup   20
+            lda   l_line+]idx,x
+            sta   ]idx
+]idx        equ   ]idx+2
+            --^
+            jmp   l_ovrly_rtn
+ 
+; Single TSB slam
+m_line
+]idx        equ   $9E
+            lup   80                    ; 80 words max for a full-width screen
+            tsb   ]idx
+]idx        equ   ]idx-2
+            --^
+m_end
+            jmp      m_ovrly_rtn
+
+
+; Draw a character (tile) into a location of the overlay
+;
+; A = Tile ID
+; Y = overlay address location
+tiledata     EXT
+
+_DrawChar
+            jsl             GetTileAddr
+            tax
+
+]idx        equ             0
+            lup             8
+            ldal            tiledata+32+{]idx*4},x
+            sta:            {]idx*OVRLY_SPAN}+MASK_OFFSET,y
+            ldal            tiledata+{]idx*4},x
+            sta:            {]idx*OVRLY_SPAN},y
+            ldal            tiledata+32+{]idx*4}+2,x
+            sta:            {]idx*OVRLY_SPAN}+MASK_OFFSET+2,y
+            ldal            tiledata+{]idx*4}+2,x
+            sta:            {]idx*OVRLY_SPAN}+2,y
+]idx        equ             ]idx+1
+            --^
+            rts

demos/shell/gen/App.TileMapBG0.s

@@ -96,11 +96,11 @@ App_TileMapBG0
         dw $1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$100f,$0010,$0011,$1012,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029
         dw $1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029
         dw $1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029
-        dw $1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029
+        dw $1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$0800,$0801,$0800,$0801,$1029,$1029,$1029,$1029
         dw $1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$000b,$000c,$000d,$000e,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1013,$0014,$0015,$1016,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029
         dw $1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029
         dw $1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029
-        dw $1029,$1029,$1029,$1029,$1039,$103a,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029
+        dw $1029,$1029,$1029,$1029,$1039,$103a,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$0802,$0803,$0802,$0803,$1029,$1029,$1029,$1029
         dw $1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$100f,$0010,$0011,$1012,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1013,$0014,$0015,$1016,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029
         dw $1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029
         dw $1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029
@@ -112,11 +112,11 @@ App_TileMapBG0
         dw $1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1013,$0014,$0015,$1016,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1013,$0014,$0015,$1016,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029
         dw $1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029
         dw $1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029
-        dw $1029,$1038,$0015,$003e,$0015,$0015,$003e,$0015,$103b,$1029,$1029,$1029,$0800,$0801,$0800,$0801,$0800,$0801,$0800,$0801,$0800,$0801,$1029,$1029,$102a,$102b,$102a,$102b,$102a,$102b,$1029,$1029,$1029,$1038,$0015,$003e,$1238,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$102a,$102b,$1029,$1029,$1029,$1029,$1029,$1029,$1013,$0014,$0015,$1016,$1029,$1029,$1029,$1029
+        dw $1029,$1038,$0015,$003e,$0015,$0015,$003e,$0015,$103b,$1029,$1029,$1029,$0800,$0801,$0800,$0801,$0800,$0801,$0800,$0801,$0800,$0801,$1029,$1029,$102a,$102b,$102a,$102b,$102a,$102b,$1029,$1029,$1029,$1038,$0015,$003e,$1238,$1029,$1029,$1029,$0800,$0801,$0800,$0801,$0800,$0801,$1029,$1029,$102a,$102b,$1029,$1029,$1029,$1029,$0800,$0801,$1013,$0014,$0015,$1016,$1029,$1029,$0800,$0801
         dw $1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1013,$0014,$0015,$1016,$1029,$1029,$1029,$1029,$102a,$102b,$102a,$102b,$1029,$1029,$1029,$1029,$1013,$0014,$0015,$1016,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029
         dw $1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029
         dw $1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029
-        dw $1038,$0015,$0015,$0015,$0015,$0015,$0015,$0015,$0015,$103b,$1029,$1029,$0802,$0803,$0802,$0803,$0802,$0803,$0802,$0803,$0802,$0803,$1029,$102c,$002d,$002d,$002d,$002d,$002d,$002d,$102e,$1029,$1038,$0015,$0015,$0015,$0015,$1238,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$102c,$002d,$002d,$102e,$1029,$1029,$1029,$1029,$1029,$1013,$0014,$0015,$1016,$1029,$1029,$1029,$1029
+        dw $1038,$0015,$0015,$0015,$0015,$0015,$0015,$0015,$0015,$103b,$1029,$1029,$0802,$0803,$0802,$0803,$0802,$0803,$0802,$0803,$0802,$0803,$1029,$102c,$002d,$002d,$002d,$002d,$002d,$002d,$102e,$1029,$1038,$0015,$0015,$0015,$0015,$1238,$1029,$1029,$0802,$0803,$0802,$0803,$0802,$0803,$1029,$102c,$002d,$002d,$102e,$1029,$1029,$1029,$0802,$0803,$1013,$0014,$0015,$1016,$1029,$1029,$0802,$0803
         dw $1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1013,$0014,$0015,$1016,$1029,$1029,$1029,$102c,$002d,$002d,$002d,$002d,$102e,$1029,$1029,$1029,$1013,$0014,$0015,$1016,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029
         dw $1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029
         dw $1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029,$1029

demos/shell/package.json

@@ -24,7 +24,7 @@
     "build:assets-woz-fatbits": "node %npm_package_config_png2iigs% ./assets/woz-pixelated.png ./emu/bg1a.bin --start-index 6 && node %npm_package_config_png2iigs% ./assets/woz-shifted.png ./emu/bg1b.bin --start-index 6 && node %npm_package_config_png2iigs% ./assets/donut-plains-1-6-color.png ./emu/fg1.bin",
     "build:assets-color-cycle": "node %npm_package_config_png2iigs% ./assets/rotopattern.png ./emu/bg1a.bin --start-index 6 && node %npm_package_config_png2iigs% ./assets/woz-shifted.png ./emu/bg1b.bin --start-index 6 && node %npm_package_config_png2iigs% ./assets/donut-plains-1-6-color.png ./emu/fg1.bin",
     "build:map": "node %npm_package_config_tiled2iigs% ./assets/tiled/world_1-1.json --output-dir ./gen",
-    "build:tiles": "node %npm_package_config_png2iigs% ./assets/tilesets/smb-16.png --max-tiles 224 --as-tile-data --transparent-color-index 3 > ./gen/App.TileSet.s"
+    "build:tiles": "node %npm_package_config_png2iigs% ./assets/tilesets/smb-16.png --max-tiles 360 --as-tile-data --transparent-color-index 11 > ./gen/App.TileSet.s"
   },
   "repository": {
     "type": "git",

src/Core.s

@@ -14,6 +14,9 @@ NO_MUSIC          equ       1                   ; turn music + tool loading off
 ; External data provided by the main program segment
 tiledata          EXT
 
+; IF there are overlays, they are provided as an external
+Overlay           EXT
+
 ; Core engine functionality.  The idea is that that source file can be PUT into
 ; a main source file and all of the functionality will be available.
 ;

src/GTE.s

@@ -38,6 +38,7 @@ StopScript         EXT
 
 ; Direct access to internals
 DoScriptSeq        EXT
+GetTileAddr        EXT
 
 ; Allocate a full 64K bank
 AllocBank          EXT

src/Render.s

@@ -88,9 +88,9 @@ _Render
 
             jsr   _ShadowOff
 
-;            ldx   #0                  ; Blit the full virtual buffer to the screen
+            ldx   #0                  ; Blit the full virtual buffer to the screen
-;            ldy   #8
+            ldy   #8
-;            jsr   _BltRange
+            jsr   _BltRange
 
             jsr   _ShadowOn
 
@@ -102,9 +102,15 @@ _Render
 ;            ldy   #16
 ;            jsr   _BltRange
 
-;            jsr   Overlay
+            lda   ScreenY0             ; pass the address of the first line of the overlay
+            asl
+            tax
+            lda   ScreenAddr,x
+            clc
+            adc   ScreenX0
+            jsl   Overlay
 
-            ldx   #0                  ; Blit the full virtual buffer to the screen
+            ldx   #8                  ; Blit the full virtual buffer to the screen
             ldy   ScreenHeight
             jsr   _BltRange
 

src/blitter/PEISlammer.s

@@ -101,88 +101,3 @@ _PEISlam
 
 :stk_save        ds    2
 :screen_width_1  ds    2
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src/blitter/Template.s

@@ -665,6 +665,25 @@ epilogue_1         tsc
 ;            bcs  alt_exit      ; 2/3
 ;            pha
 ;            ...
+;
+; A theoretical exception handler that performed a full 3-level blend would be
+;
+;  start     lda  0,s
+;            and  [00],y
+;            ora  (00),y
+;            and  $80,x
+;            ora  $00,x
+;            and  #MASK
+;            ora  #DATA
+;            bcs  alt_exit
+;            pha                ; 4
+;  out       brl  next          ; 4 Fast-path completes in 5 additional cycles
+;
+;  alt_exit  bvs  r_edge        ; 2/3 
+;            clc                ; 2
+;            brl  l_jmp_rtn     ; 3
+;  r_edge    rep   #$41
+;            brl  r_jmp_rtn     ; 3
 
 
                    ds    \,$00                      ; pad to the next page boundary

src/blitter/Tiles.s

@@ -53,6 +53,9 @@ TILE_CTRL_MASK   equ             $1E00                             ; Deliberatel
 ; A = tile descriptor
 ;
 ; The address is the TileID * 128 + (HFLIP * 64)
+GetTileAddr      ENT
+                 jsr             _GetTileAddr
+                 rtl
 _GetTileAddr
                  asl                                               ; Multiply by 2
                  bit             #2*TILE_HFLIP_BIT                 ; Check if the horizontal flip bit is set