; 		CSC 111 Assignment 3: The Truth is Out There
;
;			    Due Wednesday 3/13/02
;
;  1. (warmup).  Write a program using vga mode 13h to make the entire screen
;  blue.  For this part, you should take advantage of the fact that you
;  have a 32-bit machine and transfer the bytes four at a time.

;  2. Write a procedure to display a 256-color bitmap onto the screen.
;  The first 4 bytes of the bitmap represents the dimensions of the bit
;  map (two bytes for height, followed by two bytes for width - see example
;  below for clarification).  Bytes with value 0 should be interpreted as
;  transparent.  Your procedure should work with bitmaps of any dimension.
;  It should take in as parameters the starting address of the bitmap, and
;  the x,y coordinates of the top left corner where the bitmap should be 
;  displayed.

;  3. Animate the flying saucer bitmap below by having it move up the 
;  screen smoothly.  Use a delay between frames.  To animate, you need
;  to erase the old image before drawing the new image in a new position.
;  You must preserve the original background.  You may consider drawing 
;  a blue rectangle, or simply repaint the entire background.  If you're
;  ambitious you can try double-buffering and other techniques.  
;  You are free to add more complexity to the animation (of course).  You
;  can also alter the bitmap and/or use more than one bitmap.  


; flying saucer bitmap
.data

; use this 24x9 bit map for the shape of a flying saucer (you can 
; change it of course).  Can you figure out a way to interpret 00 as
; transparent instead of as color black?
shape	db 9,0,24,0
	db 00,00,00,00,00,00,00,00,00,00,04,04,04,04,04,00,00,00,00,00,00,00,00,00
	db 00,00,00,00,00,00,00,00,04,04,04,04,04,04,04,04,04,00,00,00,00,00,00,00
	db 00,00,00,00,00,00,00,00,04,04,04,04,04,04,04,04,04,00,00,00,00,00,00,00
	db 00,00,00,00,00,00,04,04,04,04,02,04,02,04,02,04,04,04,04,00,00,00,00,00
	db 00,00,04,04,04,04,04,04,04,04,02,04,04,04,02,04,04,04,04,04,04,04,04,00
	db 00,04,04,04,04,04,04,04,04,04,04,04,04,04,04,04,04,04,04,04,04,04,04,04
	db 00,00,04,04,04,04,04,04,04,04,04,04,04,04,04,04,04,04,04,04,04,04,04,00
	db 00,00,00,00,00,00,00,04,00,00,00,00,00,00,00,00,00,04,00,00,00,00,00,00
	db 00,00,00,00,00,00,04,00,00,00,00,00,00,00,00,00,00,00,04,00,00,00,00,00