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asmgen
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Modifications to jump table for vanilla 6502 support 

* added argparse for argument parsing & printing usage
This commit is contained in:
Rob McMullen 2017-05-30 14:06:33 -07:00
parent 34e34055d4
commit b74d5141a1
1 changed files with 30 additions and 26 deletions
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56
HiSprite.py
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@ -1,6 +1,7 @@
#!/usr/bin/python
import sys,os,png
import argparse
class Colors:
black,magenta,green,orange,blue,white,key = range(7)
@ -8,20 +9,22 @@ class Colors:
def main(argv):
if len(argv)<1:
usage()
exit(0)
parser = argparse.ArgumentParser(description="Sprite compiler for 65C02/6502 to generate assembly code to render all shifts of the given sprite, optionally with exclusive-or drawing (if background will be non-black). Generated code has conditional compilation directives for the CC65 assembler to allow the same file to be compiled for either architecture.")
parser.add_argument("-v", "--verbose", default=0, action="count")
parser.add_argument("-t", "--tables", action="store_true", default=False, help="output only lookup tables for horizontal sprite shifts (division and modulus 7)")
parser.add_argument("-x", "--xdraw", action="store_true", default=False, help="use XOR for sprite drawing")
parser.add_argument("files", metavar="IMAGE", nargs="+", help="a PNG image [or a list of them]. PNG files must not have an alpha channel!")
options, extra_args = parser.parse_known_args()
if sys.argv[1] == "--tables":
if options.tables:
printHorizontalLookup()
exit(0)
pngfile = sys.argv[1]
xdraw = 0
if len(argv)>1 and sys.argv[2] == "--xdraw":
xdraw = 1
for pngfile in options.files:
process(pngfile, options.xdraw)
def process(pngfile, xdraw=False):
reader = png.Reader(pngfile)
try:
pngdata = reader.asRGB8()
@ -41,13 +44,29 @@ def main(argv):
print "\tSAVE_AXY"
print "\tldy PARAM0"
print "\tldx MOD7_2,y"
print ".ifpC02"
print "\tjmp (%s_JMP,x)\n" % (niceName)
offset_suffix = ""
# Bit-shift jump table
# Bit-shift jump table for 65C02
print "%s_JMP:" % (niceName)
for shift in range(0,7):
print "\t.addr %s_SHIFT%d" % (niceName,shift)
print ".else"
# Fast jump table routine; faster and smaller than self-modifying code
print "\tlda %s_JMP+1,x" % (niceName)
print "\tpha"
print "\tlda %s_JMP,x" % (niceName)
print "\tpha"
print "\trts\n"
# Bit-shift jump table for generic 6502
print "%s_JMP:" % (niceName)
for shift in range(0,7):
print "\t.addr %s_SHIFT%d-1" % (niceName,shift)
print ".endif"
# Blitting functions
print "\n"
for shift in range(0,7):
@ -289,22 +308,7 @@ def printHorizontalLookup():
print "\n\nMOD7_2:"
for pixel in range(140):
print "\t.byte $%02x" % ((pixel % 7)*2)
def usage():
print '''
Usages:
HiSprite <png file> [--xdraw]
Generates 6502 assembly to render all shifts of the given sprite,
optionally with exclusive-or drawing (if background will be non-black)
HiSprite --tables
Generates lookup tables for horizontal sprite shifts (division and modulus 7)
PNG file must not have an alpha channel!
'''
sys.exit(2)
def disclaimer():
print '''