Improved graphics
- Added multicolor graphic mode with custom charset, for text and tiles - Added some debug options in Makefile NOTE: code is functioning and correct, but really needs a big cleanup a logical reorganization!
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0932566285
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4
.gitignore
vendored
4
.gitignore
vendored
@ -1 +1,3 @@
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snake.prg
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*.prg
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*.out
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symbols.txt
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5
Makefile
5
Makefile
@ -1,5 +1,8 @@
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64:
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dasm snake.asm -DSYSTEM=64 -osnake.prg
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dasm snake.asm -DSYSTEM=64 -DDEBUG=0 -osnake.prg
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debug:
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dasm snake.asm -DSYSTEM=64 -DDEBUG=1 -ssymbols.txt -osnake.prg
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16:
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dasm snake.asm -DSYSTEM=16 -osnake.prg
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148
multicolor.asm
Normal file
148
multicolor.asm
Normal file
@ -0,0 +1,148 @@
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processor 6502
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multicolor SUBROUTINE
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; Prepare data struct for MultiColor mode
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; ----------------------------------------------------------------------
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multicolorInit:
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; Deactivate interrupt
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; This is needed to avoid calls from I/O while dealing with bank
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; switching (I/O addresses are the same)
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sei
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; Put char ROM in CPU address space
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; It becomes visible at $d000
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; This overrides I/O
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; lda $1
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; and #$fb
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; sta $1
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; Copy ROM original content from $d000 to $3800
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; ldx #0
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;.copyLoop:
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; lda $d000,x
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; sta $3800,x
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; lda $d100,x
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; sta $3900,x
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; lda $d200,x
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; sta $3a00,x
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; lda $d300,x
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; sta $3b00,x
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; lda $d400,x
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; sta $3c00,x
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; lda $d500,x
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; sta $3d00,x
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; lda $d600,x
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; sta $3e00,x
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; lda $d700,x
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; sta $3f00,x
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; inx
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; bne .copyLoop
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; Copy The GGS Font and
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; make higher half the inverse of lower one
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ldx #$00
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.tggsCopy
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dex
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lda .tggsFont,x
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sta $3800,x
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eor #$ff
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sta $3c00,x
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lda .tggsFont + $100,x
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sta $3900,x
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eor #$ff
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sta $3d00,x
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lda .tggsFont + $200,x
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sta $3a00,x
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eor #$ff
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sta $3e00,x
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lda .tggsFont + $300,x
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sta $3b00,x
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eor #$ff
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sta $3f00,x
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cpx #$0
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bne .tggsCopy
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; Edit character definitions in RAM (using previous defined table)
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ldx #$8
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.editLoop:
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dex
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lda .multicolorSnakeTile,x
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sta $3800 + SNAKE_TILE * 8,x
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lda .multicolorFoodTile,x
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sta $3800 + FOOD_TILE * 8,x
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; lda .multicolorOtherTile,x
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; sta $3800 + SOME_TILE * 8,x
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; ...
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cpx #$0
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bne .editLoop
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; Put ROM away from CPU address space, and re-enable I/O
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; lda $1
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; ora #$4
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; sta $1
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; Set foreground color in [8-F] to all locations to enable multicolor mode for every single char
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; ldx #0
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; lda #$d
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;colorLoop:
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; sta $d800,x
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; sta $d900,x
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; sta $da00,x
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; sta $db00,x
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; inx
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; bne colorLoop
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; Tell VIC-II to read characters from $3800 = 0xe * 0x400
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lda $d018
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ora #$0e
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sta $d018
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; Re-enable interrupts and return
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cli
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rts
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; Activate multicolor mode
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; ----------------------------------------------------------------------
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multicolorOn:
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; Set colors
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lda #9
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sta $d021 ; 00 is brown
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lda #2
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sta $d022 ; 01 is red
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lda #13
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sta $d023 ; 10 is green
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; and of course
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; 11 is the colour specified in color RAM
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lda $d016
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ora #$10
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sta $d016
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rts
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; Deactivate multicolor mode
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; ----------------------------------------------------------------------
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multicolorOff:
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lda $d016
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and #$ef
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sta $d016
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rts
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; Costants
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; ----------------------------------------------------------------------
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.multicolorCommodoreTile:
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BYTE #$00,#$30,#$cc,#$ca,#$c0,#$c5,#$cc,#$30
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.multicolorSnakeTile:
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BYTE #$00,#$28,#$ab,#$ab,#$ab,#$ab,#$28,#$00
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.multicolorFoodTile:
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BYTE #%00010101
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BYTE #%10010101
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BYTE #%10010101
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BYTE #%10010101
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BYTE #%10101000
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BYTE #%00100000
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BYTE #%00100000
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BYTE #%10000000
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.tggsFont
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INCBIN "tggs.font"
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62
snake.asm
62
snake.asm
@ -103,10 +103,10 @@ SCREEN_W = 40
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SCREEN_H = 24
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; Snake features
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SNAKE_TILE = 81
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SNAKE_COLOR = 5
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SNAKE_COLOR = 13
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; Food features
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FOOD_TILE = 90
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FOOD_COLOR = 15
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FOOD_COLOR = 11
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; Strings
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gameoverString:
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@ -128,10 +128,19 @@ intro2string:
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intro3string:
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BYTE "(C) 2018"
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BYTE #0
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colorshade: ; a shade from dark-gray to bright yellow, and vice-versa (40 columns)
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BYTE #11,#11,#11,#11,#11,#12,#12,#12,#12,#12,#5,#5,#5
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BYTE #13,#13,#13,#13,#7,#7,#7,#7,#7,#7
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BYTE #13,#13,#13,#13,#5,#5,#5,#12,#12,#12,#12,#12,#11,#11,#11,#11,#11
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colorshade: ; a gradient of dark-bright-dark, with only hi-res colors (40 columns)
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BYTE #5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5,#5
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; BYTE #6,#6,#6
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; BYTE #2,#2,#2,#2
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; BYTE #5,#5,#5,#5
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; BYTE #7,#7,#7,#7
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; BYTE #3,#3,#3,#3
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; BYTE #1,#1,#1,#1
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; BYTE #3,#3,#3,#3
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; BYTE #7,#7,#7,#7
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; BYTE #5,#5,#5,#5
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; BYTE #2,#2,#2,#2
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; BYTE #6,#6,#6
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scoreString:
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BYTE "POINTS"
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BYTE #0
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@ -184,6 +193,9 @@ start:
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lda #0
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jsr sidtune
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; Initialize MultiColor mode
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jsr multicolorInit
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; Set status as first-time intro playing
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lda #ST_INTRO0
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sta status
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@ -224,6 +236,9 @@ endless:
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; Full game reset
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; ----------------------------------------------------------------------
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fullreset:
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; Turn MultiColor mode on
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jsr multicolorOn
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; Clear screen
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ldx #$ff
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lda #$20
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@ -236,11 +251,9 @@ fullresetCLS:
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cpx #$ff
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bne fullresetCLS
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; Set screen colors
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lda #12
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sta $d020 ; overscan
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lda #9
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sta $d021 ; center
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; Set overscan
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lda #11
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sta $d020
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; Upper bar -- fill with reversed spaces, color yellow
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ldx #39
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upperbarLoop:
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@ -280,6 +293,8 @@ upperbarLoop:
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; Intro reset
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; ----------------------------------------------------------------------
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introreset:
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jsr multicolorOff
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; Clear screen
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ldx #$ff
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lda #$20
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@ -292,9 +307,7 @@ introresetCLS:
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cpx #$ff
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bne introresetCLS
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; Copy shade colors from costant table to color RAM for 2nd and 4th
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; line of text. Soon there will be some text bouncing on these
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; lines
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; Copy shade colors from costant table to color RAM for 2nd and 4th line of text
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ldx #39
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introresetColorShade
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lda colorshade,x
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@ -307,7 +320,6 @@ introresetColorShade
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; Set screen colors
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lda #0
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sta $d020 ; overscan
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lda #0
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sta $d021 ; center
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; Print website
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@ -349,6 +361,12 @@ irq:
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tya
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pha
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#if DEBUG = 1
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; Change background to visually see the ISR timing
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lda #2
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sta $d020
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#endif
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; Check status and call appropriate sub-routine
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; Sort of switch-case
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lda status
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@ -377,9 +395,13 @@ checkEndStatus:
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jsr sidtune + 3
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; Increase random value
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ldx random
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inx
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stx random
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inc random
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#if DEBUG = 1
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; Change background back again to visally see ISR timing
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lda #11
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sta $d020
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#endif
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; Restore registers from stack
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pla
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@ -949,6 +971,10 @@ printIntroEndCheck:
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printIntroEnd:
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rts
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; Include
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; ______________________________________________________________________
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INCLUDE "multicolor.asm"
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;
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; coded during december 2017
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; by giomba -- giomba at glgprograms.it
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