# Starter file for ex1.asm

.data 0x0
magic: space 5 		# more than enough space to read in "P3\n" plus null
	...
        
.text 0x3000

main:
	...
	...
	#------------------------------------------------------------#
	# Write code here to do exactly what main does in the C program.
	# That is, read and write the magic numbers,
	# read and write the number of cols and rows,
	# and read and write the ppm_max values.  The output's
	# magic number will be "P2".  And, regardless of the input's
	# ppm_max, the output will always have 255 as its ppm_max.
	#------------------------------------------------------------#


	#------------------------------------------------------------#
	# Write code here to implement the double-for loop of the C
	# program, to iterate through all the pixels in the image.
	#
	# The actual conversion from RGB to gray value of a single
	# pixel must be done by a separate procedure called rgb_to_gray
	#------------------------------------------------------------#
	...
	...
	jal	rgb_to_gray
	...
	...


end: 
	ori   $v0, $0, 10     # system call 10 for exit
	syscall               # exit



rgb_to_gray:
	#------------------------------------------------------------#
	# $a0 has r
	# $a1 has g
	# $a2 has b
	# $a3 has ppm_max
	#
	# Write code to compute gray value in $v0 and return.
	#------------------------------------------------------------#
	...
	...
	jr	$ra