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space_bars: more code moving
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Vince Weaver
parent
f26790dd8b
commit
543fc1004d
@ -16,10 +16,11 @@ space_bars.dsk: SPACE_BARS HELLO
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SPACE_BARS: space_bars.o
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ld65 -o SPACE_BARS space_bars.o -C ../linker_scripts/apple2_4000.inc
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space_bars.o: space_bars.s instructions.s game.s \
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space_bars.o: space_bars.s instructions.s \
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level3_earth.s level6_saturn.s \
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game_over.s gr_copy.s text_print.s title.s \
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spacebars_title.inc screen_split.s \
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sprites.s sprites_table.s sprites_screen.s \
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sprites_table.s sprites_screen.s \
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vapor_lock.s delay_a.s lz4_decode.s SB_BACKGROUNDC.BIN.lz4 \
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keypress.s zp.inc hardware.inc
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ca65 -o space_bars.o space_bars.s -l space_bars.lst
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115
space_bars/gr_unrle.s
Normal file
115
space_bars/gr_unrle.s
Normal file
@ -0,0 +1,115 @@
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;=================
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; load RLE image
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;=================
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; Output is BASH/BASL
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; Input is in GBASH/GBASL
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load_rle_gr:
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lda #$0
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tay ; init Y to 0
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sta TEMP ; stores the xcoord
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sta CV ; ycoord=0
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jsr load_and_increment ; load xsize
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sta CH
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rle_loop:
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jsr load_and_increment
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cmp #$A1 ; if 0xa1
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beq rle_done ; we are done
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pha
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and #$f0 ; mask
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cmp #$a0 ; see if special AX
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beq decompress_special
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pla ; note, PLA sets flags!
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ldx #$1 ; only want to print 1
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bne decompress_run
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decompress_special:
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pla
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and #$0f ; check if was A0
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bne decompress_color ; if A0 need to read run, color
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decompress_large:
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jsr load_and_increment ; get run length
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decompress_color:
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tax ; put runlen into X
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jsr load_and_increment ; get color
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decompress_run:
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rle_run_loop:
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sta (BASL),y ; write out the value
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inc BASL ; increment the pointer
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bne rle_skip3 ; if wrapped
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inc BASH ; then increment the high value
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rle_skip3:
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pha ; store colore for later
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inc TEMP ; increment the X value
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lda TEMP
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cmp CH ; compare against the image width
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bcc rle_not_eol ; if less then keep going
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lda BASL ; cheat to avoid a 16-bit add
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cmp #$a7 ; we are adding 0x58 to get
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bcc rle_add_skip ; to the next line
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inc BASH
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rle_add_skip:
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clc
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adc #$58 ; actually do the 0x58 add
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sta BASL ; and store it back
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inc CV ; add 2 to ypos
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inc CV ; each "line" is two high
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lda CV ; load value
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cmp #15 ; if it's greater than 14 it wraps
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bcc rle_no_wrap ; Thanks Woz
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lda #$0 ; we wrapped, so set to zero
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sta CV
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; when wrapping have to sub 0x3d8
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sec ; this is a 16-bit subtract routine
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lda BASL
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sbc #$d8 ; LSB
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sta BASL
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lda BASH ; MSB
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sbc #$3 ;
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sta BASH
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rle_no_wrap:
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lda #$0 ; set X value back to zero
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sta TEMP
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rle_not_eol:
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pla ; restore color
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dex
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bne rle_run_loop ; if not zero, keep looping
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beq rle_loop ; and branch always
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rle_done:
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lda #$15 ; move the cursor somewhere sane
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sta CV
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rts
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load_and_increment:
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lda (GBASL),y ; load value ; 5?
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inc GBASL ; 5?
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bne lskip2 ; 2nt/3
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inc GBASH ; 5?
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lskip2:
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rts ; 6
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@ -1,2 +1,2 @@
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10 PRINT "RASTERBARS IN SPACE V0.6"
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10 PRINT "RASTERBARS IN SPACE V0.7"
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100 PRINT CHR$ (4)"BRUN SPACE_BARS"
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@ -1,10 +1,3 @@
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; TODO
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; + merge with spacebars code
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; + end of game, fly to the right
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; + make harder as shoot more
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; + end level with enough hits?
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; Uses the 40x48d page1/page2 every-1-scanline pageflip mode
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; self modifying code to get some extra colors (pseudo 40x192 mode)
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@ -12,8 +5,12 @@
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; by deater (Vince Weaver) <vince@deater.net>
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; TODO:
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; end level after a certain number of points
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; track score properly
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start_sprites:
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level3_earth:
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;===================
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; init screen
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@ -1,7 +1,7 @@
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;================================
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; spacebars gameplay
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;================================
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game:
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level6_saturn:
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;===================
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; init screen
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@ -37,7 +37,7 @@ view_title:
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; EARTH: 40x192 sprites
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;=============================
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jsr start_sprites
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jsr level3_earth
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lda GAME_OVER
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bne game_over_man
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@ -46,7 +46,7 @@ view_title:
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; SATURN: Rasterbars
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;============================
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jsr game
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jsr level6_saturn
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;==================
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; Game Over
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@ -65,12 +65,12 @@ loop_forever:
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.include "gr_offsets.s"
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.include "../asm_routines/gr_unrle.s"
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.include "../asm_routines/keypress.s"
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.include "gr_unrle.s"
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.include "keypress.s"
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.include "gr_copy.s"
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.include "title.s"
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.include "instructions.s"
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.include "game.s"
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.include "level6_saturn.s"
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.include "text_print.s"
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.include "game_over.s"
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.align $100
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@ -85,4 +85,4 @@ loop_forever:
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.include "mode7_sprites.inc"
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.align $100
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.include "sprites.s"
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.include "level3_earth.s"
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