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build_move_data.py
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build_move_data.py
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import argparse
import fixed_point
import math
import sys
NUM_DIRS = 64
QUARTER = NUM_DIRS / 4
TAU = 6.283185307179586
INITIAL_UP = 4
def to_fixed(value):
return fixed_point.FixedPoint.from_float(value)
def build_trig_movement(fout):
fout.write('.export trig_movement\n')
fout.write('trig_movement:\n')
speed = 1.1
# Interleave directions by turning a quarter turn at each step.
for i in range(QUARTER):
vals = []
direction = i
for j in range(5):
movement = math.cos(direction * TAU / NUM_DIRS) * speed
delta = fixed_point.FixedPoint.from_float(movement)
vals.append(delta.low)
vals.append(delta.high)
direction = (direction + QUARTER) % NUM_DIRS
fout.write('.byte %s\n' % ','.join(['$%02x' % e for e in vals]))
def build_trig_lookup(fout):
fout.write('.export trig_lookup\n')
fout.write('trig_lookup:\n')
for i in range(4):
vals = []
index = i
for j in range(QUARTER):
vals.append(index*2)
index += 5
fout.write('.byte %s\n' % ','.join(['$%02x' % e for e in vals]))
def build_parabola(fout):
gravity = -INITIAL_UP
slowdown = .18
pos = 0
fout.write('.export parabola_movement\n')
fout.write('parabola_movement:\n')
while True:
pos += gravity
gravity += slowdown
byte = int(pos)
byte += (0x100 if byte < 0 else 0)
fout.write('.byte $%02x\n' % byte)
if int(pos) >= 0:
break
def build_header(fout):
fout.write('.import trig_movement\n')
fout.write('.import trig_lookup\n')
fout.write('.import parabola_movement\n')
def run():
parser = argparse.ArgumentParser()
parser.add_argument('-a', dest='asm')
parser.add_argument('-f', dest='header')
args = parser.parse_args()
fout = open(args.asm, 'w')
build_trig_movement(fout)
build_trig_lookup(fout)
build_parabola(fout)
fout.close()
fout = open(args.header, 'w')
build_header(fout)
fout.close()
if __name__ == '__main__':
run()