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#!/usr/bin/python
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# system packages
import sys
import os
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import argparse
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import re
# external packages
import png # package name is "pypng" on pypi.python.org
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class Colors :
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black , magenta , green , orange , blue , white , key = range ( 7 )
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def slugify ( s ) :
""" Simplifies ugly strings into something that can be used as an assembler
label .
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>> > print slugify ( " [Some] _ Article ' s Title-- " )
SOME_ARTICLES_TITLE
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From https : / / gist . github . com / dolph / 3622892 #file-slugify-py
"""
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# "[Some] _ Article's Title--"
# "[SOME] _ ARTICLE'S TITLE--"
s = s . upper ( )
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# "[SOME] _ ARTICLE'S_TITLE--"
# "[SOME]___ARTICLE'S_TITLE__"
for c in [ ' ' , ' - ' , ' . ' , ' / ' ] :
s = s . replace ( c , ' _ ' )
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# "[SOME]___ARTICLE'S_TITLE__"
# "SOME___ARTICLES_TITLE__"
s = re . sub ( ' \ W ' , ' ' , s )
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# "SOME___ARTICLES_TITLE__"
# "SOME ARTICLES TITLE "
s = s . replace ( ' _ ' , ' ' )
# "SOME ARTICLES TITLE "
# "SOME ARTICLES TITLE "
s = re . sub ( ' \ s+ ' , ' ' , s )
# "SOME ARTICLES TITLE "
# "SOME ARTICLES TITLE"
s = s . strip ( )
# "SOME ARTICLES TITLE"
# "SOME_ARTICLES_TITLE"
s = s . replace ( ' ' , ' _ ' )
return s
class Listing ( object ) :
disclaimer = '''
; This file was generated by HiSprite . py , a sprite compiler by Quinn Dunki .
; If you feel the need to modify this file , you are probably doing it wrong .
'''
def __init__ ( self ) :
self . lines = [ self . disclaimer ]
def __str__ ( self ) :
return " \n " . join ( self . lines ) + " \n "
def out ( self , line ) :
self . lines . append ( line )
class Sprite ( Listing ) :
def __init__ ( self , pngfile , xdraw = False ) :
Listing . __init__ ( self )
reader = png . Reader ( pngfile )
try :
pngdata = reader . asRGB8 ( )
except :
raise RuntimeError
self . xdraw = xdraw
self . niceName = slugify ( os . path . splitext ( pngfile ) [ 0 ] )
self . width = pngdata [ 0 ]
self . height = pngdata [ 1 ]
self . pixelData = list ( pngdata [ 2 ] )
self . calcStorage ( )
self . jumpTable ( )
for i in range ( self . numShifts ) :
self . blitShift ( i )
def calcStorage ( self ) :
self . byteWidth = self . width / 2 + 1 + 1 # TODO: Calculate a power of two for this
self . numShifts = 7
def jumpTable ( self ) :
# Prologue
self . out ( " %s : ; %d bytes per row " % ( self . niceName , self . byteWidth ) )
self . out ( " \t SAVE_AXY " )
self . out ( " \t ldy PARAM0 " )
self . out ( " \t ldx MOD7_2,y " )
self . out ( " .ifpC02 " )
self . out ( " \t jmp ( %s _JMP,x) \n " % ( self . niceName ) )
offset_suffix = " "
# Bit-shift jump table for 65C02
self . out ( " %s _JMP: " % ( self . niceName ) )
for shift in range ( self . numShifts ) :
self . out ( " \t .addr %s _SHIFT %d " % ( self . niceName , shift ) )
self . out ( " .else " )
# Fast jump table routine; faster and smaller than self-modifying code
self . out ( " \t lda %s _JMP+1,x " % ( self . niceName ) )
self . out ( " \t pha " )
self . out ( " \t lda %s _JMP,x " % ( self . niceName ) )
self . out ( " \t pha " )
self . out ( " \t rts \n " )
# Bit-shift jump table for generic 6502
self . out ( " %s _JMP: " % ( self . niceName ) )
for shift in range ( self . numShifts ) :
self . out ( " \t .addr %s _SHIFT %d -1 " % ( self . niceName , shift ) )
self . out ( " .endif " )
def blitShift ( self , shift ) :
# Blitting functions
self . out ( " \n " )
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# Track cycle count of the blitter. We start with fixed overhead:
# SAVE_AXY + RESTORE_AXY + rts + sprite jump table
cycleCount = 9 + 12 + 6 + 3 + 4 + 6
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self . out ( " %s _SHIFT %d : " % ( self . niceName , shift ) )
self . out ( " \t ldx PARAM1 " )
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cycleCount + = 3
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rowStartCode , extraCycles = self . rowStartCalculatorCode ( ) ;
self . out ( rowStartCode )
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cycleCount + = extraCycles
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spriteChunks = self . layoutSpriteChunk ( shift , cycleCount )
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for row in range ( self . height ) :
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for chunkIndex in range ( len ( spriteChunks ) ) :
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self . out ( spriteChunks [ chunkIndex ] [ row ] )
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def layoutSpriteChunk ( self , shift , cycleCount ) :
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colorStreams = self . byteStreamsFromPixels ( shift , bitsForColor , highBitForColor )
# print colorStreams
maskStreams = self . byteStreamsFromPixels ( shift , bitsForMask , highBitForMask )
# print maskStreams
code = self . generateBlitter ( colorStreams , maskStreams , cycleCount )
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return code
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def byteStreamsFromPixels ( self , shift , bitDelegate , highBitDelegate ) :
byteStreams = [ " " for x in range ( self . height ) ]
byteWidth = self . width / 2 + 1 + 1
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for row in range ( self . height ) :
bitStream = " "
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# Compute raw bitstream for row from PNG pixels
for pixelIndex in range ( self . width ) :
pixel = pixelColor ( self . pixelData , row , pixelIndex )
bitStream + = bitDelegate ( pixel )
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# Shift bit stream as needed
bitStream = shiftStringRight ( bitStream , shift )
bitStream = bitStream [ : byteWidth * 8 ]
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# Split bitstream into bytes
bitPos = 0
byteSplits = [ 0 for x in range ( byteWidth ) ]
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for byteIndex in range ( byteWidth ) :
remainingBits = len ( bitStream ) - bitPos
bitChunk = " "
if remainingBits < 0 :
bitChunk = " 0000000 "
else :
if remainingBits < 7 :
bitChunk = bitStream [ bitPos : ]
bitChunk + = fillOutByte ( 7 - remainingBits )
else :
bitChunk = bitStream [ bitPos : bitPos + 7 ]
bitChunk = bitChunk [ : : - 1 ]
# Determine palette bit from first pixel on each row
highBit = highBitDelegate ( self . pixelData [ row ] [ 0 ] )
byteSplits [ byteIndex ] = highBit + bitChunk
bitPos + = 7
byteStreams [ row ] = byteSplits ;
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return byteStreams
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def generateBlitter ( self , colorStreams , maskStreams , baseCycleCount ) :
byteWidth = len ( colorStreams [ 0 ] )
spriteChunks = [ [ " " for y in range ( self . height ) ] for x in range ( byteWidth ) ]
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cycleCount = baseCycleCount
optimizationCount = 0
for row in range ( self . height ) :
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byteSplits = colorStreams [ row ]
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# Generate blitting code
for chunkIndex in range ( len ( byteSplits ) ) :
# Optimization
if byteSplits [ chunkIndex ] != " 00000000 " and \
byteSplits [ chunkIndex ] != " 10000000 " :
# Store byte into video memory
if self . xdraw :
spriteChunks [ chunkIndex ] [ row ] = \
" \t lda (SCRATCH0),y \n " + \
" \t eor # %% %s \n " % byteSplits [ chunkIndex ] + \
" \t sta (SCRATCH0),y \n " ;
cycleCount + = 5 + 2 + 6
else :
spriteChunks [ chunkIndex ] [ row ] = \
" \t lda # %% %s \n " % byteSplits [ chunkIndex ] + \
" \t sta (SCRATCH0),y \n " ;
cycleCount + = 2 + 6
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else :
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optimizationCount + = 1
# Increment indices
if chunkIndex == len ( byteSplits ) - 1 :
spriteChunks [ chunkIndex ] [ row ] + = " \n "
else :
spriteChunks [ chunkIndex ] [ row ] + = " \t iny "
cycleCount + = 2
# Finish the row
if row < self . height - 1 :
rowStartCode , extraCycles = self . rowStartCalculatorCode ( )
spriteChunks [ chunkIndex ] [ row ] + = " \t inx \n " + rowStartCode ;
cycleCount + = 2 + extraCycles
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else :
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spriteChunks [ chunkIndex ] [ row ] + = " \t RESTORE_AXY \n "
spriteChunks [ chunkIndex ] [ row ] + = " \t rts \t ;Cycle count: %d , Optimized %d rows. " % ( cycleCount , optimizationCount ) + " \n "
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return spriteChunks
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def rowStartCalculatorCode ( self ) :
return \
" \t lda HGRROWS_H1,x \n " + \
" \t sta SCRATCH1 \n " + \
" \t lda HGRROWS_L,x \n " + \
" \t sta SCRATCH0 \n " + \
" \t ldy PARAM0 \n " + \
" \t lda DIV7_2,y \n " + \
" \t tay \n " , 4 + 3 + 4 + 3 + 3 + 4 + 2 ;
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def fillOutByte ( numBits ) :
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filler = " "
for bit in range ( numBits ) :
filler + = " 0 "
return filler
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def shiftStringRight ( string , shift ) :
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if shift == 0 :
return string
shift * = 2
result = " "
for i in range ( shift ) :
result + = " 0 "
result + = string
return result
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def bitsForColor ( pixel ) :
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if pixel == Colors . black :
return " 00 "
else :
if pixel == Colors . white :
return " 11 "
else :
if pixel == Colors . green or pixel == Colors . orange :
return " 01 "
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# blue or magenta
return " 10 "
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def bitsForMask ( pixel ) :
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if pixel == Colors . black :
return " 00 "
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return " 11 "
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def highBitForColor ( pixel ) :
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# Note that we prefer high-bit white because blue fringe is less noticeable than magenta.
highBit = " 0 "
if pixel == Colors . orange or pixel == Colors . blue or pixel == Colors . white :
highBit = " 1 "
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return highBit
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def highBitForMask ( pixel ) :
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return " 1 "
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def pixelColor ( pixelData , row , col ) :
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r = pixelData [ row ] [ col * 3 ]
g = pixelData [ row ] [ col * 3 + 1 ]
b = pixelData [ row ] [ col * 3 + 2 ]
color = Colors . black
if r == 255 and g == 0 and b == 255 :
color = Colors . magenta
else :
if r == 0 and g == 255 and b == 0 :
color = Colors . green
else :
if r == 0 and g == 0 and b == 255 :
color = Colors . blue
else :
if r == 255 and g > 0 and b == 0 :
color = Colors . orange
else :
if r == 255 and g == 255 and b == 255 :
color = Colors . white
else :
if r == g and r == b and r != 0 and r != 255 : # Any gray is chroma key
color = Colors . key
return color
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class HorizontalLookup ( Listing ) :
def __init__ ( self ) :
Listing . __init__ ( self )
self . generate_tables ( )
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def generate_tables ( self ) :
self . out ( " DIV7_2: " )
for pixel in range ( 140 ) :
self . out ( " \t .byte $ %02x " % ( ( pixel / 7 ) * 2 ) )
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self . out ( " \n \n MOD7_2: " )
for pixel in range ( 140 ) :
self . out ( " \t .byte $ %02x " % ( ( pixel % 7 ) * 2 ) )
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if __name__ == " __main__ " :
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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 options . tables :
print HorizontalLookup ( )
exit ( 0 )
for pngfile in options . files :
try :
print Sprite ( pngfile , options . xdraw )
except RuntimeError :
parser . usage ( )