Introduction
Background
Introduction
bgtiles.asm
bgtiled.asm
bgtilem.asm
putstile.asm
putdtile.asm
puthtile.asm
putvtile.asm
putmtile.asm
wallmeld.asm
Math
Objects
Palettes
Tiles
Utilities
Put Single Tile Routine
The following file is a routine to place a single tile on the background or window.
You can download the file as well if you don't want to cut and paste the text.
To download the file using a PC, right-click the link and select the option "Save Target As" then save the file as you would any other file from windows.
This routine calls the 8 bit multiply routine, so if you haven't already got that, you can download it from here.
Explanation
Source
;***************************************************************** ; Procedure Name : put_single_tile ; ; Author : Marc Gale (Xalthorn or Eldara) ; ; Description : Places a single tile on the background or ; window (depending upon where you tell it the ; base address of the tile map is) ; ; On Entry : A = Tile bank for the tile ; B = Y position (0-31) ; C = Tile number ; D = Palette number ; E = X position (0-31) ; HL = Base address of tile map ; ; During : All registers are used ; ; On Exit : Nothing intentional ;***************************************************************** put_single_tile: sla a ; move the ... sla a ; ... bank number to the ... sla a ; correct bit or d ; mix it with the palette number ld d,a ; store the result in d push de ; preserve d for later ld a,0 ; select ... ldh [$4F],a ; ... data bank 0 ld d,0 ; set the high byte of DE to 0 add hl,de ; increase the map pointer ld a,b ; grab the y position ld b,32 ; put 32 (a row width) into b call multiply_8 ; multiply a x b add hl,de ; add the result to the map pointer ld a,c ; get the tile number ld [hl],a ; place it on the map ld a,1 ; switch to data ... ldh [$4F],a ; ... bank 1 pop de ; restore bank 1 data ld a,d ; get the bank 1 data ld [hl],a ; place it on the map ret ; we're done
