Backing store driver and sample implementation for 3 byte * 11 row sprites
This commit is contained in:
Rob McMullen
parent
5d550a6ef0
commit
b2842a1c39
12
HiSprite.py
12
HiSprite.py
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@ -166,7 +166,7 @@ class Listing(object):
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class Sprite(Listing):
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def __init__(self, pngfile, assembler, screen, xdraw=False, use_mask=False, processor="any", name=""):
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def __init__(self, pngfile, assembler, screen, xdraw=False, use_mask=False, backing_store=False, processor="any", name=""):
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Listing.__init__(self, assembler)
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self.screen = screen
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@ -175,6 +175,7 @@ class Sprite(Listing):
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self.xdraw = xdraw
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self.use_mask = use_mask
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self.backing_store = backing_store
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self.processor = processor
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if not name:
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name = os.path.splitext(pngfile)[0]
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@ -274,6 +275,10 @@ class Sprite(Listing):
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self.comment_line(str(c) + " " + str(m))
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self.out("")
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if self.backing_store:
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byteWidth = len(colorStreams[0])
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self.asm("jsr savebg_%dx%d" % (byteWidth, self.height))
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self.asm("ldx PARAM1")
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cycleCount += 3
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rowStartCode,extraCycles = self.rowStartCalculatorCode();
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@ -317,7 +322,7 @@ class Sprite(Listing):
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for chunkIndex in range(len(byteSplits)):
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# Optimization
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if maskSplits[chunkIndex] == "01111111":
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if maskSplits[chunkIndex] == "01111111" and not self.backing_store:
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optimizationCount += 1
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else:
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value = self.binary_constant(byteSplits[chunkIndex])
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@ -638,6 +643,7 @@ if __name__ == "__main__":
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parser.add_argument("-r", "--rows", action="store_true", default=False, help="output row (y position) lookup tables")
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parser.add_argument("-x", "--xdraw", action="store_true", default=False, help="use XOR for sprite drawing")
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parser.add_argument("-m", "--mask", action="store_true", default=False, help="use mask for sprite drawing")
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parser.add_argument("-b", "--backing-store", action="store_true", default=False, help="add code to store background")
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parser.add_argument("-a", "--assembler", default="cc65", choices=["cc65","mac65"], help="Assembler syntax (default: %(default)s)")
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parser.add_argument("-p", "--processor", default="any", choices=["any","6502", "65C02"], help="Processor type (default: %(default)s)")
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parser.add_argument("-s", "--screen", default="hgrcolor", choices=["hgrcolor","hgrbw"], help="Screen format (default: %(default)s)")
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@ -667,7 +673,7 @@ if __name__ == "__main__":
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for pngfile in options.files:
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try:
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listings.append(Sprite(pngfile, assembler, screen, options.xdraw, options.mask, options.processor, options.name))
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listings.append(Sprite(pngfile, assembler, screen, options.xdraw, options.mask, options.backing_store, options.processor, options.name))
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except RuntimeError, e:
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print "%s: %s" % (pngfile, e)
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sys.exit(1)
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@ -15,7 +15,7 @@ collookupcolor.s: HiSprite.py
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python HiSprite.py -a mac65 -p 6502 -c > collookupcolor.s
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bwsprite.s: HiSprite.py collookupbw.s rowlookup.s $(BWSPRITE)
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python HiSprite.py -a mac65 -p 6502 -s hgrbw $(BWSPRITE) -n bwsprite -m > bwsprite.s
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python HiSprite.py -a mac65 -p 6502 -s hgrbw $(BWSPRITE) -n bwsprite -m -b > bwsprite.s
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colorsprite.s: HiSprite.py collookupcolor.s rowlookup.s $(COLORSPRITE)
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python HiSprite.py -a mac65 -p 6502 -s hgrcolor $(COLORSPRITE) -n colorsprite -m > colorsprite.s
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@ -0,0 +1,133 @@
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; backing store test, hardcoded for 3x11 apple.png-sized sprite
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;
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; The backing store memory starts from some high address
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; and grows downward in order to facilitate speedier restoring, because
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; there will be different sized chunks to restore
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;
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;
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;
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;
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; needs:
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; bgstore: (lo byte, hi byte) 1 + the first byte of free memory.
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; I.e. points just beyond the last byte
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; PARAM0: (byte) x coord
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; PARAM1: (byte) y coord
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;
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; everything else is known because the sizes of each erase/restore
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; routine will be hardcoded.
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; modification of quinn's column sweep
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; memory needed for this chunk of background:
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; 2: address of restore routine
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; 1: x coordinate
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; 1: y coordinate
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; 33: number of bytes of background to save
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SIZE_3X11 = 2 + 1 + 1 + 3*11
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savebg_3x11
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sec
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lda bgstore
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sbc #SIZE_3X11
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sta bgstore
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lda bgstore+1
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sbc #0
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sta bgstore+1
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ldy #0
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lda #<restorebg_3x11
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sta (bgstore),y
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iny
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lda #>restorebg_3x11
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sta (bgstore),y
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iny
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lda PARAM0
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sta (bgstore),y
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iny
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lda PARAM1
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sta bgline
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sta (bgstore),y
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iny
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savebg_3x11_line
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ldx bgline ; Calculate Y line
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lda HGRROWS_H1,x ; Compute hires row
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sta savebg_3x11_col0+2
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sta savebg_3x11_col1+2
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sta savebg_3x11_col2+2
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lda HGRROWS_L,x
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sta savebg_3x11_col0+1
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sta savebg_3x11_col1+1
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sta savebg_3x11_col2+1
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ldx PARAM0 ; Compute hires column
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lda DIV7_1,x
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tax
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savebg_3x11_col0
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lda $2000,x
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sta (bgstore),y
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iny
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inx
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savebg_3x11_col1
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lda $2000,x
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sta (bgstore),y
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iny
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inx
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savebg_3x11_col2
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lda $2000,x
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sta (bgstore),y
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iny
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inc bgline
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cpy #SIZE_3X11
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bcc savebg_3x11_line
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rts
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; bgstore will be pointing right to the data to be blitted back to the screen,
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; which is 4 bytes into the bgstore array. Everything before the data will have
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; already been pulled off by the driver in order to figure out which restore
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; routine to call. Y will be 4 upon entry, and PARAM0 and PARAM1 will be
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; filled with the x & y values.
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;
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; also, no need to save registers because this is being called from a driver
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; that will do all of that.
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restorebg_3x11
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ldx PARAM1 ; Calculate Y line
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lda HGRROWS_H1,x ; Compute hires row
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sta restorebg_3x11_col0+2
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sta restorebg_3x11_col1+2
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sta restorebg_3x11_col2+2
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lda HGRROWS_L,x
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sta restorebg_3x11_col0+1
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sta restorebg_3x11_col1+1
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sta restorebg_3x11_col2+1
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ldx PARAM0 ; Compute hires column
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lda DIV7_1,x
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tax
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lda (bgstore),y
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restorebg_3x11_col0
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sta $2000,x
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iny
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inx
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lda (bgstore),y
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restorebg_3x11_col1
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sta $2000,x
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iny
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inx
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lda (bgstore),y
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restorebg_3x11_col2
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sta $2000,x
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iny
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inc PARAM1
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cpy #SIZE_3X11
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bcc restorebg_3x11
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rts
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@ -0,0 +1,59 @@
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; Driver to restore the screen using all the saved data.
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;
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; The backing store is a stack that grows downward in order to restore the
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; chunks in reverse order that they were saved. Each entry in the stack
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; includes:
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;
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; 2 bytes: address of restore routine
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; 1 byte: x coordinate
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; 1 byte: y coordinate
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; nn: x * y bytes of data, in lists of rows
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;
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; Note that sprites of different sizes will have different sized entries
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; in the stack, so the entire list has to be processed in order. But you want
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; that anyway, so it's not a big deal.
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;
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; The global variable 'bgstore' is used as the stack pointer. It musts be
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; initialized to a page boundary, the stack grows downward from there.
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; starting from the last byte on the previous page. E.g. if the initial
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; value is $c000, the stack grows down using $bfff as the highest address,
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; the initial bgstore value must point to 1 + the last usable byte
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;
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; All registers are clobbered because there's no real need to save them since
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; this will be called from the main game loop.
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restorebg_init
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lda #0 ; init backing store to end of free memory, $c000
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sta bgstore
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lda #BGTOP
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sta bgstore+1
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rts
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restorebg_driver
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ldy #0
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lda (bgstore),y
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sta restorebg_jsr+1
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iny
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lda (bgstore),y
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sta restorebg_jsr+2
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iny
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lda (bgstore),y
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sta PARAM0
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iny
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lda (bgstore),y
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sta PARAM1
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iny
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restorebg_jsr
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jsr $ffff
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clc
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lda bgstore
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adc #SIZE_3X11
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sta bgstore
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lda bgstore+1
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adc #0
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sta bgstore+1
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cmp #BGTOP
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bcc restorebg_driver
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rts
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BIN
multitest.dsk
BIN
multitest.dsk
Binary file not shown.
35
multitest.s
35
multitest.s
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@ -22,6 +22,10 @@ SCRATCH1 = $1a
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SPRITEPTR_L = $1b
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SPRITEPTR_H = $1c
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BGTOP = $c0 ; page number of first byte beyond top of backing store stack
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bgstore = $80
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bgline = $82
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; constants
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MAXPOSX = 127 ; This demo doesn't wanna do 16 bit math
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MAXPOSY = 127
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@ -42,12 +46,12 @@ gameloop
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jsr renderstart
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jsr movestart
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jsr wait
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jsr erasestart
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jsr restorebg_driver
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jmp gameloop
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initsprites
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nop
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jsr restorebg_init
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rts
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@ -132,12 +136,9 @@ flipY
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clc
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adc #1
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sta sprite_dy,y
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jmp moveloop
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jmp movenext
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erasestart
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rts
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wait
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ldy #$06 ; Loop a bit
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@ -176,26 +177,32 @@ clr1
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bcc clr1
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rts
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; Sprite data is interleaved so a simple indexed mode can be used. This is not
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; convenient to set up but makes faster accessing because you don't have to
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; increment the index register. For example, all the info about sprite #2 can
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; be indexed using Y = 2 on the indexed operators, e.g. "lda sprite_active,y",
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; "lda sprite_x,y", etc.
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sprite_active
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.byte 1, 1, 0, $ff ; 1 = active, 0 = skip, $ff = end of list
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.byte 1, 1, 1, 1, 1, 1, 1, 1, $ff ; 1 = active, 0 = skip, $ff = end of list
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sprite_l
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.byte <COLORSPRITE, <BWSPRITE, 0, 0
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.byte <BWSPRITE, <BWSPRITE, <BWSPRITE, <BWSPRITE, <BWSPRITE, <BWSPRITE, <BWSPRITE, <BWSPRITE
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sprite_h
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.byte >COLORSPRITE, >BWSPRITE, 0, 0
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.byte >BWSPRITE, >BWSPRITE, >BWSPRITE, >BWSPRITE, >BWSPRITE, >BWSPRITE, >BWSPRITE, >BWSPRITE
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sprite_x
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.byte 80, 64, 0, 0
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.byte 80, 64, 33, 83, 4, 9, 55, 18
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sprite_y
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.byte 116, 126, 0, 0
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.byte 116, 126, 40, 60, 80, 100, 120, 140
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sprite_dx
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.byte -1, 4, 0, 0
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.byte -1, -2, -3, -4, 1, 2, 3, 4
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sprite_dy
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.byte -3, 1, 0, 0
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.byte -4, -3, -2, -1, 4, 3, 2, 1
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.include colorsprite.s
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@ -203,3 +210,5 @@ sprite_dy
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.include rowlookup.s
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.include collookupbw.s
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.include collookupcolor.s
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.include backingstore.s
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.include backingstore-3x11.s
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