mirror of https://github.com/weiju/amiga-stuff
scrolling:integrated the xy limited algorithm
This commit is contained in:
Wei-ju Wu
parent
7f15fd6575
commit
a11f22ab0c
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@ -5,20 +5,23 @@ ASM_FLAGS = -Fhunk -devpac
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CC=vc +aos68k
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CFLAGS=-c99 -I$(NDK_INC) -DDEBUG
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all: xunlimited xlimited
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all: xunlimited xlimited xylimited
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clean:
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rm -f xunlimited xlimited *.o
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cop_x.o: cop_x.asm
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$(ASM) $(ASM_FLAGS) -o $@ $<
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.c.o:
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%.o: %.c
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$(CC) $(CFLAGS) -c -o $@ $^
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%.o: %.asm
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$(ASM) $(ASM_FLAGS) -o $@ $<
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xunlimited: hardware.o cop_x.o common.o xunlimited.o
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$(CC) -o $@ $^ -lamiga -lauto
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xlimited: hardware.o cop_x.o common.o xlimited.o
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$(CC) -o $@ $^ -lamiga -lauto
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xylimited: hardware.o cop_xy.o common.o xylimited.o
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$(CC) -o $@ $^ -lamiga -lauto
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@ -0,0 +1,172 @@
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SECTION copperlist,DATA,CHIP
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XDEF _CopperList
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XDEF _CopFETCHMODE
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XDEF _CopBPLCON0
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XDEF _CopBPLCON1
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XDEF _CopBPLCON3
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XDEF _CopBPLMODA
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XDEF _CopBPLMODB
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XDEF _CopDIWSTART
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XDEF _CopDIWSTOP
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XDEF _CopDDFSTART
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XDEF _CopDDFSTOP
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XDEF _CopPLANE1H
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XDEF _CopPLANE1L
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XDEF _CopPLANE2H
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XDEF _CopPLANE2L
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XDEF _CopPLANE3H
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XDEF _CopPLANE3L
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XDEF _CopPLANE4H
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XDEF _CopPLANE4L
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XDEF _CopPLANE5H
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XDEF _CopPLANE5L
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XDEF _CopPLANE6H
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XDEF _CopPLANE6L
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XDEF _CopPLANE7H
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XDEF _CopPLANE7L
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XDEF _CopPLANE8H
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XDEF _CopPLANE8L
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XDEF _CopVIDEOSPLIT
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XDEF _CopVIDEOSPLITMODULO
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XDEF _CopVIDEOSPLIT2
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XDEF _CopPLANE2_1H
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XDEF _CopPLANE2_2H
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XDEF _CopPLANE2_3H
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XDEF _CopPLANE2_4H
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XDEF _CopPLANE2_5H
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XDEF _CopPLANE2_6H
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XDEF _CopPLANE2_7H
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XDEF _CopPLANE2_8H
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XDEF _CopVIDEOSPLITRESETMODULO
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_CopperList:
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dc.w $180,0
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_CopFETCHMODE:
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dc.w $1FC,0
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_CopBPLCON0:
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dc.w $100,0
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_CopBPLCON1:
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dc.w $102,0
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_CopBPLCON3:
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dc.w $106,0
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_CopBPLMODA:
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dc.w $108,0
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_CopBPLMODB:
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dc.w $10A,0
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_CopDIWSTART:
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dc.w $8e,0
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_CopDIWSTOP:
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dc.w $90,0
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_CopDDFSTART:
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dc.w $92,0
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_CopDDFSTOP:
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dc.w $94,0
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dc.w $2001,-2
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_CopPLANE1H:
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dc.w $e0,0
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_CopPLANE1L:
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dc.w $e2,0
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_CopPLANE2H:
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dc.w $e4,0
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_CopPLANE2L:
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dc.w $e6,0
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_CopPLANE3H:
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dc.w $e8,0
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_CopPLANE3L:
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dc.w $ea,0
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_CopPLANE4H:
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dc.w $ec,0
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_CopPLANE4L:
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dc.w $ee,0
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_CopPLANE5H:
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dc.w $f0,0
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_CopPLANE5L:
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dc.w $f2,0
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_CopPLANE6H:
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dc.w $f4,0
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_CopPLANE6L:
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dc.w $f6,0
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_CopPLANE7H:
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dc.w $f8,0
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_CopPLANE7L:
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dc.w $fa,0
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_CopPLANE8H:
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dc.w $fc,0
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_CopPLANE8L:
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dc.w $fe,0
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_CopVIDEOSPLIT:
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dc.w -1,-2
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dc.w -1,-2
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_CopVIDEOSPLITMODULO:
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dc.w $108,0
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dc.w $10A,0
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_CopVIDEOSPLIT2:
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dc.w -1,-2
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dc.w -1,-2
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_CopPLANE2_1H:
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dc.w $e0,0
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_CopPLANE2_2H:
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dc.w $e4,0
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_CopPLANE2_3H:
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dc.w $e8,0
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_CopPLANE2_4H:
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dc.w $ec,0
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_CopPLANE2_5H:
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dc.w $f0,0
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_CopPLANE2_6H:
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dc.w $f4,0
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_CopPLANE2_7H:
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dc.w $f8,0
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_CopPLANE2_8H:
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dc.w $fc,0
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_CopVIDEOSPLITRESETMODULO:
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dc.w $108,0
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dc.w $10A,0
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dc.w -1,-2
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END
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@ -0,0 +1,43 @@
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extern WORD CopperList[];
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extern WORD CopFETCHMODE[];
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extern WORD CopBPLCON0[];
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extern WORD CopBPLCON1[];
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extern WORD CopBPLCON3[];
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extern WORD CopBPLMODA[];
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extern WORD CopBPLMODB[];
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extern WORD CopDIWSTART[];
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extern WORD CopDIWSTOP[];
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extern WORD CopDDFSTART[];
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extern WORD CopDDFSTOP[];
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extern WORD CopPLANE1H[];
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extern WORD CopPLANE1L[];
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extern WORD CopPLANE2H[];
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extern WORD CopPLANE2L[];
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extern WORD CopPLANE3H[];
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extern WORD CopPLANE3L[];
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extern WORD CopPLANE4H[];
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extern WORD CopPLANE4L[];
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extern WORD CopPLANE5H[];
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extern WORD CopPLANE5L[];
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extern WORD CopPLANE6H[];
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extern WORD CopPLANE6L[];
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extern WORD CopPLANE7H[];
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extern WORD CopPLANE7L[];
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extern WORD CopPLANE8H[];
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extern WORD CopPLANE8L[];
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extern WORD CopVIDEOSPLIT[];
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extern WORD CopVIDEOSPLITMODULO[];
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extern WORD CopVIDEOSPLIT2[];
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extern WORD CopPLANE2_1H[];
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extern WORD CopPLANE2_2H[];
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extern WORD CopPLANE2_3H[];
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extern WORD CopPLANE2_4H[];
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extern WORD CopPLANE2_5H[];
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extern WORD CopPLANE2_6H[];
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extern WORD CopPLANE2_7H[];
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extern WORD CopPLANE2_8H[];
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extern WORD CopVIDEOSPLITRESETMODULO[];
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@ -15,15 +15,9 @@
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#define SCREENWIDTH 320
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#define SCREENHEIGHT 256
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#define EXTRAWIDTH 32
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#define SCREENBYTESPERROW (SCREENWIDTH / 8)
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#define BITMAPHEIGHT SCREENHEIGHT
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#define BLOCKSWIDTH 320
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#define BLOCKSHEIGHT 256
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#define BLOCKSDEPTH 4
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#define BLOCKSCOLORS (1L << BLOCKSDEPTH)
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#define BLOCKWIDTH 16
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@ -40,5 +34,6 @@
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#define IS_BITMAP_INTERLEAVED(bitmap) ((GetBitMapAttr(bitmap, BMA_FLAGS) & BMF_INTERLEAVED) == BMF_INTERLEAVED)
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#define ROUND2BLOCKWIDTH(x) ((x) & ~(BLOCKWIDTH - 1))
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#define ROUND2BLOCKHEIGHT(x) ((x) & ~(BLOCKHEIGHT - 1))
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#endif /* __GLOBAL_DEFS_H__ */
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@ -158,3 +158,16 @@ BOOL JoyLeft(void) { return (custom->joy1dat & 512) ? TRUE : FALSE; }
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BOOL JoyRight(void) { return (custom->joy1dat & 2) ? TRUE : FALSE; }
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BOOL JoyFire(void) { return ((*(UBYTE *)0xbfe001) & 128) ? FALSE : TRUE; }
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BOOL LMBDown(void) { return ((*(UBYTE *)0xbfe001) & 64) ? FALSE : TRUE; }
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BOOL JoyUp(void)
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{
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// ^ = xor
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WORD w = custom->joy1dat << 1;
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return ((w ^ custom->joy1dat) & 512) ? TRUE : FALSE;
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}
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BOOL JoyDown(void)
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{
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// ^ = xor
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WORD w = custom->joy1dat << 1;
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return ((w ^ custom->joy1dat) & 2) ? TRUE : FALSE;
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}
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@ -19,10 +19,15 @@
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#include "global_defs.h"
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#include "common.h"
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#define EXTRAWIDTH 32
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#define BITMAPWIDTH (SCREENWIDTH + EXTRAWIDTH)
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#define BITMAPHEIGHT SCREENHEIGHT
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#define BITMAPBYTESPERROW (BITMAPWIDTH / 8)
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#define BLOCKSWIDTH 320
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#define BLOCKSHEIGHT 256
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#define BITMAPBLOCKSPERROW (BITMAPWIDTH / BLOCKWIDTH)
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#define BITMAPBLOCKSPERCOL (BITMAPHEIGHT / BLOCKHEIGHT)
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@ -19,11 +19,17 @@
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#include "global_defs.h"
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#include "common.h"
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#define EXTRAWIDTH 32
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#define BITMAPWIDTH ((SCREENWIDTH + EXTRAWIDTH) * 2)
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#define BITMAPHEIGHT SCREENHEIGHT
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#define BITMAPBYTESPERROW (BITMAPWIDTH / 8)
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#define HALFBITMAPWIDTH (BITMAPWIDTH / 2)
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#define BLOCKSWIDTH 320
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#define BLOCKSHEIGHT 256
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#define BITMAPBLOCKSPERROW (BITMAPWIDTH / BLOCKWIDTH)
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#define HALFBITMAPBLOCKSPERROW (BITMAPBLOCKSPERROW / 2)
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#define BITMAPBLOCKSPERCOL (BITMAPHEIGHT / BLOCKHEIGHT)
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@ -0,0 +1,806 @@
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#include <exec/exec.h>
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#include <dos/dos.h>
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#include <intuition/intuition.h>
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#include <graphics/gfx.h>
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#include <hardware/custom.h>
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#include <hardware/dmabits.h>
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#include <clib/exec_protos.h>
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#include <clib/dos_protos.h>
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#include <clib/graphics_protos.h>
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#include <clib/intuition_protos.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "hardware.h"
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#include "cop_xy.h"
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#include "global_defs.h"
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#include "common.h"
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#define EXTRAWIDTH 64
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#define EXTRAHEIGHT 32
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#define BITMAPWIDTH (SCREENWIDTH + EXTRAWIDTH)
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#define BITMAPBYTESPERROW (BITMAPWIDTH / 8)
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#define BITMAPHEIGHT (SCREENHEIGHT + EXTRAHEIGHT)
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#define BLOCKSWIDTH 320
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#define BLOCKSHEIGHT 200
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#define NUMSTEPS_X BLOCKWIDTH
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#define NUMSTEPS_Y BLOCKHEIGHT
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#define BITMAPBLOCKSPERROW (BITMAPWIDTH / BLOCKWIDTH)
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#define BITMAPBLOCKSPERCOL (BITMAPHEIGHT / BLOCKHEIGHT)
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#define VISIBLEBLOCKSX (SCREENWIDTH / BLOCKWIDTH)
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#define VISIBLEBLOCKSY (SCREENHEIGHT / BLOCKHEIGHT)
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#define BITMAPPLANELINES (BITMAPHEIGHT * BLOCKSDEPTH)
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#define BLOCKPLANELINES (BLOCKHEIGHT * BLOCKSDEPTH)
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#define BLOCKSFILESIZE (BLOCKSWIDTH * BLOCKSHEIGHT * BLOCKSPLANES / 8 + PALSIZE)
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#define DIRECTION_IGNORE 0
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#define DIRECTION_LEFT 1
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#define DIRECTION_RIGHT 2
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// calculate how many times (steps) y-scrolling needs to
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// blit two blocks instead of one block to make sure a
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// complete row is blitted after 16 pixels of y-scrolling
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//
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// x * 2 + (16 - x) = BITMAPBLOCKSPERROW
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// 2x + 16 - x = BITMAPBLOCKSPERROW
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// x = BITMAPBLOCKSPERROW - 16
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#define TWOBLOCKS (BITMAPBLOCKSPERROW - NUMSTEPS_Y)
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#define TWOBLOCKSTEP TWOBLOCKS
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struct Screen *scr;
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struct RastPort *ScreenRastPort;
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struct BitMap *BlocksBitmap, *ScreenBitmap;
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UBYTE *frontbuffer,*blocksbuffer;
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WORD mapposx,mapposy,videoposx,videoposy,block_videoposy;
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WORD mapblockx,mapblocky,stepx,stepy;
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WORD bitmapheight,bitplanemodulo;
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WORD *savewordpointer;
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WORD saveword;
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BYTE previous_xdirection;
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struct PrgOptions options;
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struct LevelMap level_map;
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UWORD colors[BLOCKSCOLORS];
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char s[256];
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#if EXTRAWIDTH == 32
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// bitmap width aligned to 32 Pixels
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#define MAX_FETCHMODE 2
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#define MAX_FETCHMODE_S "2"
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#elif EXTRAWIDTH == 64
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// bitmap width aligned to 64 Pixels
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#define MAX_FETCHMODE 3
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#define MAX_FETCHMODE_S "3"
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#else
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// bad extrawidth
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#error "EXTRAWIDTH must be either 32 or 64"
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#endif
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struct FetchInfo fetchinfo [] =
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{
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{0x30,0xD0,2,0,16}, /* normal */
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{0x28,0xC8,4,16,32}, /* BPL32 */
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{0x28,0xC8,4,16,32}, /* BPAGEM */
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{0x18,0xB8,8,48,64} /* BPL32 + BPAGEM */
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};
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/************* SETUP/CLEANUP ROUTINES ***************/
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static void Cleanup (char *msg)
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{
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WORD rc;
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if (msg)
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{
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printf("Error: %s\n",msg);
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rc = RETURN_WARN;
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} else {
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rc = RETURN_OK;
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}
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if (scr) CloseScreen(scr);
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if (ScreenBitmap)
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{
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WaitBlit();
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FreeBitMap(ScreenBitmap);
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}
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if (BlocksBitmap)
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{
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WaitBlit();
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FreeBitMap(BlocksBitmap);
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}
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if (level_map.raw_map) FreeVec(level_map.raw_map);
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exit(rc);
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}
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static void OpenDisplay(void)
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{
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struct DimensionInfo diminfo;
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DisplayInfoHandle dih;
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ULONG modeid;
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LONG l;
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bitmapheight = BITMAPHEIGHT + (level_map.width / BITMAPBLOCKSPERROW / BLOCKSDEPTH) + 1 + 3;
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if (!(ScreenBitmap = AllocBitMap(BITMAPWIDTH, bitmapheight, BLOCKSDEPTH,
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BMF_STANDARD | BMF_INTERLEAVED | BMF_CLEAR,0))) {
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Cleanup("Can't alloc screen bitmap!");
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}
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frontbuffer = ScreenBitmap->Planes[0];
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frontbuffer += (fetchinfo[options.fetchmode].bitmapoffset / 8);
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if (!(TypeOfMem(ScreenBitmap->Planes[0]) & MEMF_CHIP))
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{
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Cleanup("Screen bitmap is not in CHIP RAM!?? If you have a gfx card try disabling \"planes to fast\" or similiar options in your RTG system!");
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}
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l = GetBitMapAttr(ScreenBitmap,BMA_FLAGS);
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if (!(GetBitMapAttr(ScreenBitmap,BMA_FLAGS) & BMF_INTERLEAVED))
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{
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Cleanup("Screen bitmap is not in interleaved format!??");
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}
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modeid = get_mode_id(options.how, options.ntsc);
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if (!(scr = OpenScreenTags(0,SA_Width,BITMAPWIDTH,
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SA_Height,bitmapheight,
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SA_Depth,BLOCKSDEPTH,
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SA_DisplayID,modeid,
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SA_BitMap,ScreenBitmap,
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options.how ? SA_Overscan : TAG_IGNORE,OSCAN_TEXT,
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options.how ? SA_AutoScroll : TAG_IGNORE,TRUE,
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SA_Quiet,TRUE,
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TAG_DONE)))
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{
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Cleanup("Can't open screen!");
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}
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|
||||
if (scr->RastPort.BitMap->Planes[0] != ScreenBitmap->Planes[0])
|
||||
{
|
||||
Cleanup("Screen was not created with the custom bitmap I supplied!??");
|
||||
}
|
||||
ScreenRastPort = &scr->RastPort;
|
||||
LoadRGB4(&scr->ViewPort,colors,BLOCKSCOLORS);
|
||||
}
|
||||
|
||||
static void InitCopperlist(void)
|
||||
{
|
||||
WORD *wp;
|
||||
ULONG plane,plane2;
|
||||
LONG l;
|
||||
|
||||
WaitVBL();
|
||||
|
||||
custom->dmacon = 0x7FFF;
|
||||
custom->beamcon0 = options.ntsc ? 0 : DISPLAYPAL;
|
||||
|
||||
CopFETCHMODE[1] = options.fetchmode;
|
||||
|
||||
// bitplane control registers
|
||||
CopBPLCON0[1] = ((BLOCKSDEPTH * BPL0_BPU0_F) & BPL0_BPUMASK) +
|
||||
((BLOCKSDEPTH / 8) * BPL0_BPU3_F) +
|
||||
BPL0_COLOR_F +
|
||||
(options.speed ? 0 : BPL0_USEBPLCON3_F);
|
||||
|
||||
CopBPLCON1[1] = 0;
|
||||
CopBPLCON3[1] = BPLCON3_BRDNBLNK;
|
||||
|
||||
// bitplane modulos
|
||||
l = BITMAPBYTESPERROW * BLOCKSDEPTH -
|
||||
SCREENBYTESPERROW - fetchinfo[options.fetchmode].modulooffset;
|
||||
|
||||
CopBPLMODA[1] = l;
|
||||
CopBPLMODB[1] = l;
|
||||
|
||||
CopVIDEOSPLITRESETMODULO[1] = l;
|
||||
CopVIDEOSPLITRESETMODULO[3] = l;
|
||||
|
||||
bitplanemodulo = l;
|
||||
|
||||
// display window start/stop
|
||||
CopDIWSTART[1] = DIWSTART;
|
||||
CopDIWSTOP[1] = DIWSTOP;
|
||||
|
||||
// display data fetch start/stop
|
||||
CopDDFSTART[1] = fetchinfo[options.fetchmode].ddfstart;
|
||||
CopDDFSTOP[1] = fetchinfo[options.fetchmode].ddfstop;
|
||||
|
||||
// plane pointers
|
||||
wp = CopPLANE1H;
|
||||
|
||||
for (l = 0; l < BLOCKSDEPTH; l++) {
|
||||
plane = (ULONG)ScreenBitmap->Planes[l];
|
||||
wp[1] = plane >> 16;
|
||||
wp[3] = plane & 0xFFFF;
|
||||
|
||||
wp += 4;
|
||||
}
|
||||
|
||||
// setup modulo trick
|
||||
plane = (ULONG)ScreenBitmap->Planes[0];
|
||||
|
||||
plane2 = plane +
|
||||
(BITMAPHEIGHT - 1) * BITMAPBYTESPERROW * BLOCKSDEPTH +
|
||||
SCREENBYTESPERROW +
|
||||
fetchinfo[options.fetchmode].modulooffset;
|
||||
|
||||
l = (plane - plane2) & 0xFFFF;
|
||||
|
||||
CopVIDEOSPLITMODULO[1] = l;
|
||||
CopVIDEOSPLITMODULO[3] = l;
|
||||
CopVIDEOSPLITMODULO[1] = l;
|
||||
CopVIDEOSPLITMODULO[3] = l;
|
||||
|
||||
custom->intena = 0x7FFF;
|
||||
custom->dmacon = DMAF_SETCLR | DMAF_BLITTER | DMAF_COPPER | DMAF_RASTER | DMAF_MASTER;
|
||||
custom->cop2lc = (ULONG)CopperList;
|
||||
}
|
||||
|
||||
/******************* SCROLLING **********************/
|
||||
|
||||
static void DrawBlock(LONG x,LONG y,LONG mapx,LONG mapy)
|
||||
{
|
||||
UBYTE block;
|
||||
|
||||
// x = in pixels
|
||||
// y = in "planelines" (1 realline = BLOCKSDEPTH planelines)
|
||||
x = (x / 8) & 0xFFFE;
|
||||
block = level_map.data[mapy * level_map.width + mapx];
|
||||
|
||||
mapx = (block % BLOCKSPERROW) * (BLOCKWIDTH / 8);
|
||||
mapy = (block / BLOCKSPERROW) * (BLOCKPLANELINES * BLOCKSBYTESPERROW);
|
||||
|
||||
if (options.how) OwnBlitter();
|
||||
|
||||
HardWaitBlit();
|
||||
custom->bltcon0 = 0x9F0; // use A and D. Op: D = A
|
||||
custom->bltcon1 = 0;
|
||||
custom->bltafwm = 0xFFFF;
|
||||
custom->bltalwm = 0xFFFF;
|
||||
custom->bltamod = BLOCKSBYTESPERROW - (BLOCKWIDTH / 8);
|
||||
custom->bltdmod = BITMAPBYTESPERROW - (BLOCKWIDTH / 8);
|
||||
custom->bltapt = blocksbuffer + mapy + mapx;
|
||||
custom->bltdpt = frontbuffer + y * BITMAPBYTESPERROW + x;
|
||||
custom->bltsize = BLOCKPLANELINES * 64 + (BLOCKWIDTH / 16);
|
||||
|
||||
if (options.how) DisownBlitter();
|
||||
}
|
||||
|
||||
static void FillScreen(void)
|
||||
{
|
||||
WORD a,b,x,y;
|
||||
for (b = 0; b < BITMAPBLOCKSPERCOL; b++) {
|
||||
for (a = 0; a < BITMAPBLOCKSPERROW; a++) {
|
||||
x = a * BLOCKWIDTH;
|
||||
y = b * BLOCKPLANELINES;
|
||||
DrawBlock(x,y,a,b);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static void ScrollUp(void)
|
||||
{
|
||||
WORD mapx,mapy,x,y;
|
||||
if (mapposy < 1) return;
|
||||
|
||||
mapposy--;
|
||||
mapblocky = mapposy / BLOCKHEIGHT;
|
||||
stepy = mapposy & (NUMSTEPS_Y - 1);
|
||||
videoposy--;
|
||||
if (videoposy < 0) videoposy += BITMAPHEIGHT;
|
||||
if (stepy == (NUMSTEPS_Y - 1)) {
|
||||
block_videoposy -= BLOCKHEIGHT;
|
||||
if (block_videoposy < 0) block_videoposy += BITMAPHEIGHT;
|
||||
}
|
||||
if (stepy == (NUMSTEPS_Y - 1)) {
|
||||
// a complete row is filled up
|
||||
// : the next fill up row will be BLOCKHEIGHT (16)
|
||||
// pixels at the top, so we have to adjust
|
||||
// the fillup column (for x scrolling), but
|
||||
// only if the fillup column (x) contains some
|
||||
// fill up blocks
|
||||
if (stepx) {
|
||||
// step 1: blit the 1st block in the fillup
|
||||
// col (x). There can only be 0 or
|
||||
// [2 or more] fill up blocks in the
|
||||
// actual implementation, so we do
|
||||
// not need to check previous_xdirection
|
||||
// for this blit
|
||||
mapx = mapblockx + BITMAPBLOCKSPERROW;
|
||||
mapy = mapblocky + 1;
|
||||
x = ROUND2BLOCKWIDTH(videoposx);
|
||||
y = (block_videoposy + BLOCKHEIGHT) % BITMAPHEIGHT;
|
||||
y *= BLOCKSDEPTH;
|
||||
|
||||
DrawBlock(x + BITMAPWIDTH,y,mapx,mapy);
|
||||
|
||||
// step 2: remove the (former) bottommost fill up
|
||||
// block
|
||||
if (previous_xdirection == DIRECTION_RIGHT) {
|
||||
*savewordpointer = saveword;
|
||||
}
|
||||
mapy = stepx + 2;
|
||||
|
||||
// we blit a 'left' block
|
||||
y = (block_videoposy + (mapy * BLOCKHEIGHT)) % BITMAPHEIGHT;
|
||||
y *= BLOCKSDEPTH;
|
||||
savewordpointer = (WORD *)(frontbuffer + (y * BITMAPBYTESPERROW) + (x / 8));
|
||||
saveword = *savewordpointer;
|
||||
|
||||
mapx -= BITMAPBLOCKSPERROW;
|
||||
mapy += mapblocky;
|
||||
|
||||
DrawBlock(x,y,mapx,mapy);
|
||||
previous_xdirection = DIRECTION_LEFT;
|
||||
|
||||
} /* if (stepx) */
|
||||
} /* if (stepy == NUMSTEPS_Y - 1) */
|
||||
|
||||
mapx = stepy;
|
||||
mapy = mapblocky;
|
||||
y = block_videoposy * BLOCKSDEPTH;
|
||||
|
||||
if (mapx >= TWOBLOCKSTEP) {
|
||||
// blit only one block
|
||||
mapx += TWOBLOCKSTEP;
|
||||
x = mapx * BLOCKWIDTH + ROUND2BLOCKWIDTH(videoposx);
|
||||
mapx += mapblockx;
|
||||
DrawBlock(x,y,mapx,mapy);
|
||||
} else {
|
||||
// blit two blocks
|
||||
mapx *= 2;
|
||||
x = mapx * BLOCKWIDTH + ROUND2BLOCKWIDTH(videoposx);
|
||||
mapx += mapblockx;
|
||||
DrawBlock(x,y,mapx,mapy);
|
||||
x += BLOCKWIDTH;
|
||||
DrawBlock(x,y,mapx + 1,mapy);
|
||||
}
|
||||
}
|
||||
|
||||
static void ScrollDown(void)
|
||||
{
|
||||
WORD mapx,mapy,x,y,y2;
|
||||
|
||||
if (mapposy >= (level_map.height * BLOCKHEIGHT - SCREENHEIGHT - BLOCKHEIGHT)) return;
|
||||
|
||||
mapx = stepy;
|
||||
mapy = mapblocky + BITMAPBLOCKSPERCOL;
|
||||
|
||||
y = block_videoposy * BLOCKSDEPTH;
|
||||
|
||||
if (mapx >= TWOBLOCKSTEP) {
|
||||
// blit only one block
|
||||
mapx += TWOBLOCKSTEP;
|
||||
x = mapx * BLOCKWIDTH + ROUND2BLOCKWIDTH(videoposx);
|
||||
mapx += mapblockx;
|
||||
DrawBlock(x,y,mapx,mapy);
|
||||
} else {
|
||||
// blit two blocks
|
||||
mapx *= 2;
|
||||
x = mapx * BLOCKWIDTH + ROUND2BLOCKWIDTH(videoposx);
|
||||
mapx += mapblockx;
|
||||
DrawBlock(x,y,mapx,mapy);
|
||||
x += BLOCKWIDTH;
|
||||
DrawBlock(x,y,mapx + 1,mapy);
|
||||
}
|
||||
mapposy++;
|
||||
mapblocky = mapposy / BLOCKHEIGHT;
|
||||
stepy = mapposy & (NUMSTEPS_Y - 1);
|
||||
videoposy++;
|
||||
if (videoposy >= BITMAPHEIGHT) videoposy -= BITMAPHEIGHT;
|
||||
if (!stepy) {
|
||||
block_videoposy += BLOCKHEIGHT;
|
||||
if (block_videoposy >= BITMAPHEIGHT) block_videoposy -= BITMAPHEIGHT;
|
||||
}
|
||||
|
||||
if (stepy == 0) {
|
||||
// a complete row is filled up
|
||||
// : the next fill up row will be BLOCKHEIGHT (16)
|
||||
// pixels at the bottom, so we have to adjust
|
||||
// the fillup column (for x scrolling), but
|
||||
// only if the fillup column (x) contains some
|
||||
// fill up blocks
|
||||
if (stepx) {
|
||||
// step 1: blit the 1st block in the fillup
|
||||
// row (y) because this block must
|
||||
// not be part of the fillup col (x)
|
||||
// instead it is for exclusive use
|
||||
// by the fillup row
|
||||
mapx = mapblockx;
|
||||
mapy = mapblocky;
|
||||
x = ROUND2BLOCKWIDTH(videoposx);
|
||||
y = block_videoposy * BLOCKSDEPTH;
|
||||
DrawBlock(x,y,mapx,mapy);
|
||||
|
||||
// step 2: blit the (new) bottommost fill up
|
||||
// block
|
||||
if (previous_xdirection == DIRECTION_LEFT) {
|
||||
*savewordpointer = saveword;
|
||||
}
|
||||
mapy = stepx + 1;
|
||||
|
||||
// we blit a 'right-block'
|
||||
x += BITMAPWIDTH;
|
||||
y = (block_videoposy + (mapy * BLOCKHEIGHT)) % BITMAPHEIGHT;
|
||||
y *= BLOCKSDEPTH;
|
||||
|
||||
y2 = (y + BLOCKPLANELINES - 1) % BITMAPPLANELINES;
|
||||
savewordpointer = (WORD *)(frontbuffer + (y2 * BITMAPBYTESPERROW) + (x / 8));
|
||||
saveword = *savewordpointer;
|
||||
|
||||
mapx += BITMAPBLOCKSPERROW;
|
||||
mapy += mapblocky;
|
||||
|
||||
DrawBlock(x,y,mapx,mapy);
|
||||
previous_xdirection = DIRECTION_RIGHT;
|
||||
} /* if (stepx) */
|
||||
} /* if (stepy == 0) */
|
||||
}
|
||||
|
||||
static void ScrollLeft(void)
|
||||
{
|
||||
WORD mapx,mapy,x,y;
|
||||
|
||||
if (mapposx < 1) return;
|
||||
|
||||
mapposx--;
|
||||
mapblockx = mapposx / BLOCKWIDTH;
|
||||
stepx = mapposx & (NUMSTEPS_X - 1);
|
||||
|
||||
videoposx--;
|
||||
|
||||
if (stepx == (NUMSTEPS_X - 1)) {
|
||||
// a complete column is filled up
|
||||
// : the next fill up column will be BLOCKWIDTH (16)
|
||||
// pixels at the left, so we have to adjust
|
||||
// the fillup row (for y scrolling)
|
||||
|
||||
// step 1: blit the block which came in at
|
||||
// the left side and which might or
|
||||
// might not be a fill up block
|
||||
mapx = mapblockx;
|
||||
mapy = mapblocky;
|
||||
|
||||
if (stepy) {
|
||||
// there is a fill up block
|
||||
// so block which comes in left is
|
||||
// a fillup block
|
||||
mapy += BITMAPBLOCKSPERCOL;
|
||||
}
|
||||
|
||||
x = ROUND2BLOCKWIDTH(videoposx);
|
||||
y = block_videoposy * BLOCKSDEPTH;
|
||||
DrawBlock(x,y,mapx,mapy);
|
||||
|
||||
// step 2: remove the (former) rightmost fillup-block
|
||||
mapx = stepy;
|
||||
if (mapx) {
|
||||
// there is a fill up block;
|
||||
if (mapx >= TWOBLOCKSTEP) {
|
||||
mapx += TWOBLOCKSTEP;
|
||||
} else {
|
||||
mapx *= 2;
|
||||
}
|
||||
x = ROUND2BLOCKWIDTH(videoposx) + (mapx * BLOCKWIDTH);
|
||||
y = block_videoposy * BLOCKSDEPTH;
|
||||
mapx += mapblockx;
|
||||
mapy -= BITMAPBLOCKSPERCOL;
|
||||
DrawBlock(x,y,mapx,mapy);
|
||||
}
|
||||
}
|
||||
mapx = mapblockx;
|
||||
mapy = stepx + 1;
|
||||
x = ROUND2BLOCKWIDTH(videoposx);
|
||||
|
||||
if (previous_xdirection == DIRECTION_RIGHT) {
|
||||
HardWaitBlit();
|
||||
*savewordpointer = saveword;
|
||||
}
|
||||
|
||||
if (mapy == 1) {
|
||||
|
||||
// blit two blocks
|
||||
mapy += mapblocky;
|
||||
y = (block_videoposy + (1 * BLOCKHEIGHT)) % BITMAPHEIGHT;
|
||||
y *= BLOCKSDEPTH;
|
||||
|
||||
savewordpointer = (WORD *)(frontbuffer + (y * BITMAPBYTESPERROW) + (x / 8));
|
||||
saveword = *savewordpointer;
|
||||
DrawBlock(x,y,mapx,mapy);
|
||||
|
||||
y = (y + BLOCKPLANELINES) % BITMAPPLANELINES;
|
||||
DrawBlock(x,y,mapx,mapy + 1);
|
||||
|
||||
} else {
|
||||
// blit one block
|
||||
mapy ++;
|
||||
y = (block_videoposy + (mapy * BLOCKHEIGHT)) % BITMAPHEIGHT;
|
||||
y *= BLOCKSDEPTH;
|
||||
mapy += mapblocky;
|
||||
|
||||
savewordpointer = (WORD *)(frontbuffer + (y * BITMAPBYTESPERROW) + (x / 8));
|
||||
saveword = *savewordpointer;
|
||||
DrawBlock(x,y,mapx,mapy);
|
||||
}
|
||||
|
||||
if (stepx) {
|
||||
previous_xdirection = DIRECTION_LEFT;
|
||||
} else {
|
||||
previous_xdirection = DIRECTION_IGNORE;
|
||||
}
|
||||
}
|
||||
|
||||
static void ScrollRight(void)
|
||||
{
|
||||
WORD mapx, mapy, x, y, y2;
|
||||
|
||||
if (mapposx >= (level_map.width * BLOCKWIDTH - SCREENWIDTH - BLOCKWIDTH)) return;
|
||||
|
||||
mapx = mapblockx + BITMAPBLOCKSPERROW;
|
||||
mapy = stepx + 1;
|
||||
|
||||
x = ROUND2BLOCKWIDTH(videoposx);
|
||||
|
||||
if (previous_xdirection == DIRECTION_LEFT) {
|
||||
HardWaitBlit();
|
||||
*savewordpointer = saveword;
|
||||
}
|
||||
|
||||
if (mapy == 1) {
|
||||
|
||||
// blit two blocks
|
||||
mapy += mapblocky;
|
||||
y = (block_videoposy + (1 * BLOCKHEIGHT)) % BITMAPHEIGHT;
|
||||
y *= BLOCKSDEPTH;
|
||||
|
||||
DrawBlock(x + BITMAPWIDTH,y,mapx,mapy);
|
||||
y = (y + BLOCKPLANELINES) % BITMAPPLANELINES;
|
||||
y2 = (y + BLOCKPLANELINES - 1) % BITMAPPLANELINES;
|
||||
|
||||
savewordpointer = (WORD *)(frontbuffer + (y2 * BITMAPBYTESPERROW) + ((x + BITMAPWIDTH) / 8));
|
||||
saveword = *savewordpointer;
|
||||
DrawBlock(x + BITMAPWIDTH,y,mapx,mapy + 1);
|
||||
|
||||
} else {
|
||||
|
||||
// blit one block
|
||||
mapy ++;
|
||||
y = (block_videoposy + (mapy * BLOCKHEIGHT)) % BITMAPHEIGHT;
|
||||
y *= BLOCKSDEPTH;
|
||||
y2 = (y + BLOCKPLANELINES - 1) % BITMAPPLANELINES;
|
||||
mapy += mapblocky;
|
||||
|
||||
savewordpointer = (WORD *)(frontbuffer + (y2 * BITMAPBYTESPERROW) + ((x + BITMAPWIDTH) / 8));
|
||||
saveword = *savewordpointer;
|
||||
DrawBlock(x + BITMAPWIDTH,y,mapx,mapy);
|
||||
}
|
||||
|
||||
mapposx++;
|
||||
mapblockx = mapposx / BLOCKWIDTH;
|
||||
stepx = mapposx & (NUMSTEPS_X - 1);
|
||||
|
||||
videoposx++;
|
||||
|
||||
if (stepx == 0) {
|
||||
// a complete column is filled up
|
||||
// : the next fill up column will be BLOCKWIDTH (16)
|
||||
// pixels at the right, so we have to adjust
|
||||
// the fillup row (for y scrolling)
|
||||
|
||||
// step 1: blit the block which came in at
|
||||
// the right side and which is never
|
||||
// a fill up block
|
||||
mapx = mapblockx + BITMAPBLOCKSPERROW - 1;
|
||||
mapy = mapblocky;
|
||||
|
||||
x = ROUND2BLOCKWIDTH(videoposx) + (BITMAPBLOCKSPERROW - 1) * BLOCKWIDTH;
|
||||
y = block_videoposy * BLOCKSDEPTH;
|
||||
DrawBlock(x,y,mapx,mapy);
|
||||
|
||||
// step 2: blit the (new) rightmost fillup-block
|
||||
mapx = stepy;
|
||||
if (mapx) {
|
||||
// there is a fill up block;
|
||||
if (mapx >= TWOBLOCKSTEP) {
|
||||
mapx += (TWOBLOCKSTEP - 1);
|
||||
} else {
|
||||
mapx = mapx * 2 - 1;
|
||||
}
|
||||
x = ROUND2BLOCKWIDTH(videoposx) + (mapx * BLOCKWIDTH);
|
||||
y = block_videoposy * BLOCKSDEPTH;
|
||||
mapx += mapblockx;
|
||||
DrawBlock(x,y,mapx,mapy + BITMAPBLOCKSPERCOL);
|
||||
}
|
||||
}
|
||||
|
||||
if (stepx) {
|
||||
previous_xdirection = DIRECTION_RIGHT;
|
||||
} else {
|
||||
previous_xdirection = DIRECTION_IGNORE;
|
||||
}
|
||||
}
|
||||
|
||||
static void CheckJoyScroll(void)
|
||||
{
|
||||
WORD i,count;
|
||||
|
||||
if (JoyFire()) count = 4;
|
||||
else count = 1;
|
||||
|
||||
if (JoyUp()) {
|
||||
for (i = 0; i < count; i++) {
|
||||
ScrollUp();
|
||||
}
|
||||
}
|
||||
|
||||
if (JoyDown()) {
|
||||
for (i = 0; i < count; i++) {
|
||||
ScrollDown();
|
||||
}
|
||||
}
|
||||
|
||||
if (JoyLeft()) {
|
||||
for (i = 0; i < count; i++) {
|
||||
ScrollLeft();
|
||||
}
|
||||
}
|
||||
|
||||
if (JoyRight()) {
|
||||
for (i = 0; i < count; i++) {
|
||||
ScrollRight();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static void UpdateCopperlist(void)
|
||||
{
|
||||
ULONG pl;
|
||||
LONG planeadd,planeaddx;
|
||||
WORD i,xpos,scroll,yoffset;
|
||||
WORD *wp;
|
||||
|
||||
i = fetchinfo[options.fetchmode].scrollpixels;
|
||||
|
||||
xpos = videoposx + i - 1;
|
||||
|
||||
planeaddx = (xpos / i) * (i / 8);
|
||||
i = (i - 1) - (xpos & (i - 1));
|
||||
|
||||
scroll = (i & 15) * 0x11;
|
||||
if (i & 16) scroll |= (0x400 + 0x4000);
|
||||
if (i & 32) scroll |= (0x800 + 0x8000);
|
||||
|
||||
// set scroll register in BPLCON1
|
||||
CopBPLCON1[1] = scroll;
|
||||
|
||||
// set top plane pointers
|
||||
yoffset = (videoposy + BLOCKHEIGHT) % BITMAPHEIGHT;
|
||||
planeadd = ((LONG) yoffset) * BLOCKSDEPTH * BITMAPBYTESPERROW;
|
||||
wp = CopPLANE1H;
|
||||
|
||||
for (i = 0; i < BLOCKSDEPTH; i++) {
|
||||
pl = ((ULONG) ScreenBitmap->Planes[i]) + planeadd + planeaddx;
|
||||
wp[1] = (WORD) (pl >> 16);
|
||||
wp[3] = (WORD) (pl & 0xFFFF);
|
||||
wp += 4;
|
||||
}
|
||||
|
||||
// set video split wait
|
||||
yoffset = BITMAPHEIGHT - yoffset;
|
||||
yoffset += (DIWSTART >> 8);
|
||||
|
||||
/* CopVIDEOSPLIT must wait for line (yoffset -1 )
|
||||
CopVIDEOSPLIT2 must wait for line (yoffset) */
|
||||
if (yoffset <= 255) {
|
||||
CopVIDEOSPLIT[0] = 0x0001;
|
||||
CopVIDEOSPLIT[2] = (yoffset - 1) * 256 + 0x1;
|
||||
CopVIDEOSPLIT2[0] = 0x0001;
|
||||
CopVIDEOSPLIT2[2] = yoffset * 256 + 0x1;
|
||||
|
||||
} else if (yoffset == 256) {
|
||||
CopVIDEOSPLIT[0] = 0x0001;
|
||||
CopVIDEOSPLIT[2] = 255 * 256 + 0x1;
|
||||
CopVIDEOSPLIT2[0] = 0xFFDF;
|
||||
CopVIDEOSPLIT2[2] = (256 - 256) * 256 + 0x1;
|
||||
} else {
|
||||
CopVIDEOSPLIT[0] = 0xFFDF;
|
||||
CopVIDEOSPLIT[2] = (yoffset - 256 - 1) * 256 + 0x1;
|
||||
CopVIDEOSPLIT2[0] = 0x001;
|
||||
CopVIDEOSPLIT2[2] = (yoffset - 256) * 256 + 0x1;
|
||||
}
|
||||
|
||||
/* Set video split plane pointers (to top of bitmap):
|
||||
We only set the hiwords. The lowords are automatically
|
||||
correct thanks to the modulo-trick in the copperlist
|
||||
which is setup in UpdateCopperlist().
|
||||
*/
|
||||
pl = (ULONG)ScreenBitmap->Planes[0] + planeaddx;
|
||||
|
||||
// set high words
|
||||
wp = CopPLANE2_1H;
|
||||
|
||||
for (i = 0; i < BLOCKSDEPTH; i++) {
|
||||
wp[1] = (WORD)(pl >> 16);
|
||||
pl += BITMAPBYTESPERROW * BLOCKSDEPTH;
|
||||
wp += 2;
|
||||
}
|
||||
}
|
||||
|
||||
static void MainLoop(void)
|
||||
{
|
||||
if (!options.how) {
|
||||
// activate copperlist
|
||||
HardWaitBlit();
|
||||
WaitVBL();
|
||||
custom->copjmp2 = 0;
|
||||
}
|
||||
|
||||
while (!LMBDown()) {
|
||||
if (!options.how) {
|
||||
WaitVBeam(1);
|
||||
UpdateCopperlist();
|
||||
WaitVBeam(200);
|
||||
} else {
|
||||
Delay(1);
|
||||
}
|
||||
|
||||
if (options.speed) *(WORD *)0xdff180 = 0xFF0;
|
||||
CheckJoyScroll();
|
||||
|
||||
if (options.speed) *(WORD *)0xdff180 = 0xF00;
|
||||
}
|
||||
}
|
||||
|
||||
/********************* MAIN *************************/
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
BOOL res = get_arguments(&options, s);
|
||||
if (!res) Cleanup(s);
|
||||
res = read_level_map(&level_map, s);
|
||||
if (!res) Cleanup(s);
|
||||
|
||||
BlocksBitmap = read_blocks(colors, s);
|
||||
if (!BlocksBitmap) Cleanup(s);
|
||||
blocksbuffer = BlocksBitmap->Planes[0];
|
||||
|
||||
OpenDisplay();
|
||||
|
||||
if (!options.how) {
|
||||
Delay(2*50);
|
||||
KillSystem();
|
||||
InitCopperlist();
|
||||
}
|
||||
|
||||
FillScreen();
|
||||
MainLoop();
|
||||
|
||||
if (!options.how) {
|
||||
ActivateSystem();
|
||||
}
|
||||
Cleanup(0);
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in New Issue