part 2

transform:
############################### Part 2: your code begins here ##



#T1 COUNTS X(inner) T0 COUNTS Y(row)

li $t0, 0 #counter that will exit out of row loop (y)

countYLoop:
beq $t0, $a3, exitYLoop #potential for error, exit entire loop if the final element is reached
li  $t1, 0   #resets the x counter once dim(end of array row) is reached

countXLoop:
beq $t1, $a3, exitXLoop #branches once the end of the end of the array row is reached

#calc x0
lbu $t2, 0($a2)   #Gives M00 of transformation matrix ASSUMING INT IS 4 BYTES
mul $t2, $t2, $t1

lbu $t3, 4($a2)  #gives M01 of transformation matrix   ASSUMING INT IS 4 BYTES
mul $t3, $t3, $t0

add $t2, $t2, $t3
lbu $t3, 8($a2) #M02 assuming 4 bytes per element

add $t2, $t3, $t2  # X0 IS STORED HERE


#calc y0
lbu $t3, 12($a2)
mul $t3, $t3, $t1

lbu $t4, 16($a2)
mul $t4, $t4, $t0

add $t3, $t3, $t4

lbu $t5, 20($a2)

add $t3, $t5, $t3   # y0 IS STORED HERE




#check bounds
bge $t2, $a3, outOfBounds
blt $t2, $zero, outOfBounds
bge $t3, $a3, outOfBounds
blt $t3, $zero, outOfBounds

#if youre in this code block, youre in bounds
mul $t4, $t3, $a3  #y0 * dim
add $t4, $t4, $t2  # OFFSET OF x0 y0 IS STORED IN T4

add $a0, $a0, $t4   #SHIFTS THE ADDRESS TO THE OFFSET CALCULATED IN THE ABOVE STEP
lbu $t5, 0($a0)      #HOLDS DATA OF INPUT ARRAY OFSETTED BY T4 in T5
#sub $a0, $a0, $t4    #RESET ADDRESS A0 TO POINT TO THE BEGINNING OF THE ARRAY

mul $t4, $t0, $a3   #CALCULATE OFFSET FOR THE OUTPUT MATRIX AND STORE IN T4
add $t4, $t4, $t1
add $a1, $a1, $t4   #OFFSETS OUTPUT MATRIX TO X AND Y
sb $t5, 0($a1)       #STORES CONTENTS OF input(x0,y0) TO T5
#sub $a1, $a1, $t4   #Reset address A1 to point to the beginning of the output array


addi $t1, $t1, 1 #update col(x) counter
j countXLoop

exitXLoop:

addi $t0, $t0, 1 #INCRE X COUNTER

j countYLoop

exitYLoop:


#out of bounds condition: store 0 in offsetted index
outOfBounds:
#calculate offset for X and Y COUNTERS
mul $t4, $t0, $a3
add $t4, $t4, $t1
add $a1, $a1, $t4    #ADD OFFSET (stored in t4) TO OUTOUT ADDRESS
sb $zero, 0($a1)
#sub $a1, $a1, $t4   #RESET A1 TO POINT AT THE BEGINNING OF THE ARRAY
addi $t0, $t0, 1 #update col(x) counter
j countXLoop