# Starter file for ex1.asm

.data 0x0
magic: space 5
	...
        
.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.
	#
	# Then simply call iterate_through_pix to process the
	# actual pixel data.
	#------------------------------------------------------------#

	jal iterate_through_pix

end: 
	ori   $v0, $0, 10     # system call 10 for exit
	syscall               # we are out of here.



iterate_through_pix:
	#------------------------------------------------------------#
	# $a0 has rows
	# $a1 has cols
	# $a2 has ppm_max
	#
	# Write code here to implement the double-for loop of the C
	# program.  Include appropriate stack management code.
	#
	# 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
	...
	...
	jr	$ra


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.
	# This is a leaf procedure, so you won't need stack here
	# if you don't modify any "non-temporary" register here.
	#------------------------------------------------------------#
	...
	...
	jr	$ra