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drawTile.asm
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EXTRN CLEAR_TILE_OFFSET:BYTE
EXTRN COUNT_TILES:BYTE
PUBLIC drawTile
PUBLIC drawColoredTile
PUBLIC clearTile
.MODEL small
.386
.DATA
TILE_START_X dw 0
TILE_END_X dw 0
TILE_START_Y dw 0
TITLE_END_Y dw 0
TILE_WIDTH equ 20
TILE_HEIGHT equ 10
BRICK_COLOR equ 20d
BORDER_COLOR_1 equ 18d
BORDER_COLOR_2 equ 22d
COLORED_BRICK_COLOR equ 44d
COLORED_BORDER_COLOR_1 equ 140d
COLORED_BORDER_COLOR_2 equ 92d
.CODE
drawTile PROC FAR
PUSHA
PUSHF
MOV BX, AX ; BH = y, BL = x
MOV AX, 0
; get the x pixel coordinate
MOV AL, BL
MOV DL, TILE_WIDTH
MUL DL
MOV TILE_START_X, AX
ADD AX, TILE_WIDTH
MOV TILE_END_X, AX
MOV AX, 0
; get the y pixel coordinate
MOV AL, BH
MOV DL, TILE_HEIGHT
MUL DL
MOV TILE_START_Y, AX
ADD AX, TILE_HEIGHT
MOV TITLE_END_Y, AX
; draw the tile
MOV AL, BRICK_COLOR
MOV AH, 0ch
MOV CX, TILE_START_X
MOV DX, TILE_START_Y
drawX:
INT 10h
INC DX
CMP DX, TITLE_END_Y
JL drawX
MOV DX, TILE_START_Y
INC CX
CMP CX, TILE_END_X
JL drawX
; draw borders
MOV AL, BORDER_COLOR_2
MOV AH, 0ch
MOV CX, TILE_START_X
MOV DX, TILE_START_Y
drawLeftBorder:
INT 10h
INC DX
CMP DX, TITLE_END_Y
JL drawLeftBorder
MOV AL, BORDER_COLOR_1
MOV AH, 0ch
MOV CX, TILE_END_X
DEC CX
MOV DX, TILE_START_Y
drawRightBorder:
INT 10h
INC DX
CMP DX, TITLE_END_Y
JL drawRightBorder
MOV AL, BORDER_COLOR_2
MOV AH, 0ch
MOV CX, TILE_START_X
MOV DX, TILE_START_Y
drawTopBorder:
INT 10h
INC CX
CMP CX, TILE_END_X
JL drawTopBorder
MOV AL, BORDER_COLOR_1
MOV AH, 0ch
MOV CX, TILE_START_X
MOV DX, TITLE_END_Y
DEC DX
drawBotBorder:
INT 10h
INC CX
CMP CX, TILE_END_X
JL drawBotBorder
POPF
POPA
RET
drawTile ENDP
drawColoredTile PROC FAR
PUSHA
PUSHF
MOV BX, AX ; BH = y, BL = x
MOV AX, 0
; get the x pixel coordinate
MOV AL, BL
MOV DL, TILE_WIDTH
MUL DL
MOV TILE_START_X, AX
ADD AX, TILE_WIDTH
MOV TILE_END_X, AX
MOV AX, 0
; get the y pixel coordinate
MOV AL, BH
MOV DL, TILE_HEIGHT
MUL DL
MOV TILE_START_Y, AX
ADD AX, TILE_HEIGHT
MOV TITLE_END_Y, AX
; draw the tile
MOV AL, COLORED_BRICK_COLOR
MOV AH, 0ch
MOV CX, TILE_START_X
MOV DX, TILE_START_Y
drawColoredX:
INT 10h
INC DX
CMP DX, TITLE_END_Y
JL drawColoredX
MOV DX, TILE_START_Y
INC CX
CMP CX, TILE_END_X
JL drawColoredX
; draw borders
MOV AL, COLORED_BORDER_COLOR_2
MOV AH, 0ch
MOV CX, TILE_START_X
MOV DX, TILE_START_Y
drawColoredLeftBorder:
INT 10h
INC DX
CMP DX, TITLE_END_Y
JL drawColoredLeftBorder
MOV AL, COLORED_BORDER_COLOR_1
MOV AH, 0ch
MOV CX, TILE_END_X
DEC CX
MOV DX, TILE_START_Y
drawColoredRightBorder:
INT 10h
INC DX
CMP DX, TITLE_END_Y
JL drawColoredRightBorder
MOV AL, COLORED_BORDER_COLOR_2
MOV AH, 0ch
MOV CX, TILE_START_X
MOV DX, TILE_START_Y
drawColoredTopBorder:
INT 10h
INC CX
CMP CX, TILE_END_X
JL drawColoredTopBorder
MOV AL, COLORED_BORDER_COLOR_1
MOV AH, 0ch
MOV CX, TILE_START_X
MOV DX, TITLE_END_Y
DEC DX
drawColoredBotBorder:
INT 10h
INC CX
CMP CX, TILE_END_X
JL drawColoredBotBorder
POPF
POPA
RET
drawColoredTile ENDP
clearTile PROC FAR
PUSHA
PUSHF
MOV BX, AX ; BH = y, BL = x
MOV AX, 0
ADD BL, CLEAR_TILE_OFFSET
; get the x pixel coordinate
MOV AL, BL
MOV DL, TILE_WIDTH
MUL DL
MOV TILE_START_X, AX
ADD AX, TILE_WIDTH
MOV TILE_END_X, AX
MOV AX, 0
; get the y pixel coordinate
MOV AL, BH
MOV DL, TILE_HEIGHT
MUL DL
MOV TILE_START_Y, AX
ADD AX, TILE_HEIGHT
MOV TITLE_END_Y, AX
; Check if the tile is there is a tile
MOV AH, 0Dh
INT 10h
CMP AL, 0
JE exitClearTile
; draw the tile
MOV AL, 00h
MOV AH, 0ch
MOV CX, TILE_START_X
MOV DX, TILE_START_Y
clearX:
INT 10h
INC DX
CMP DX, TITLE_END_Y
JL clearX
MOV DX, TILE_START_Y
INC CX
CMP CX, TILE_END_X
JL clearX
; draw borders
MOV AL, 00h
MOV AH, 0ch
MOV CX, TILE_START_X
MOV DX, TILE_START_Y
clearLeftBorder:
INT 10h
INC DX
CMP DX, TITLE_END_Y
JL clearLeftBorder
MOV AL, 00h
MOV AH, 0ch
MOV CX, TILE_END_X
DEC CX
MOV DX, TILE_START_Y
clearRightBorder:
INT 10h
INC DX
CMP DX, TITLE_END_Y
JL clearRightBorder
MOV AL, 00h
MOV AH, 0ch
MOV CX, TILE_START_X
MOV DX, TILE_START_Y
clearTopBorder:
INT 10h
INC CX
CMP CX, TILE_END_X
JL clearTopBorder
MOV AL, 00h
MOV AH, 0ch
MOV CX, TILE_START_X
MOV DX, TITLE_END_Y
DEC DX
clearBotBorder:
INT 10h
INC CX
CMP CX, TILE_END_X
JL clearBotBorder
exitClearTile:
POPF
POPA
CMP AL, 8
JGE fianlExitClearTile
MOV DH, COUNT_TILES
INC DH
MOV COUNT_TILES, DH
fianlExitClearTile:
RET
clearTile ENDP
END