328 lines
5.7 KiB
ArmAsm
328 lines
5.7 KiB
ArmAsm
; Don't Tell Valve
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; by Vince `deater` Weaver / DsR
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; 147 bytes = initial block code
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; 144 bytes = optimize color pick
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; 137 bytes = optimize table generation
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; 135 bytes = more optimization
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; zero page locations
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GBASL = $26
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GBASH = $27
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HGR_X = $E0
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HGR_Y = $E2
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HGR_SCALE = $E7
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TEMPY = $F0
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HGR_ROTATION = $F9
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INL = $FE
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INH = $FF
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; ROM locations
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HGR2 = $F3D8
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HGR = $F3E2
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BKGND0 = $F3F4
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HPOSN = $F411
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XDRAW0 = $F65D
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XDRAW1 = $F661
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HPLOT0 = $F457
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hposn_low = $6000
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hposn_high = $6100
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dont:
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jsr HGR ; Hi-res, full screen ; 3
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; Y=0, A=0 after this call
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lda #$1
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sta HGR_SCALE
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lda #$0
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sta HGR_ROTATION
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lda #$80 ; clear so we get blue/orange when xdraw
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jsr BKGND0
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;==========================
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; make table
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; ldy #0
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table_loop:
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; sty TEMPY
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; lda #0 ; we are out of bounds, does it matter?
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; tax
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tya
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jsr HPOSN
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ldy HGR_Y ; HPOSN saves this
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lda GBASL
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sta hposn_low,Y
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lda GBASH
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sta hposn_high,Y
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iny
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; cpy #192 ; what happens if we run 192..255?
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bne table_loop
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ldx #8
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draw_loop:
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jsr draw_box
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dex
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bpl draw_loop
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ldx #37
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lda #<companion_cube
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sta INL
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lda #>companion_cube
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sta INH
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jsr draw_sprite
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ldx #34
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lda #<turret
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sta INL
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lda #>turret
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sta INH
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jsr draw_sprite
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lda #101
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sta draw_sprite_y_smc+1
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ldx #38
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lda #<exit_sign
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sta INL
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lda #>exit_sign
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sta INH
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jsr draw_sprite
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; jsr do_xdraw
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ending:
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jmp ending
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box_color_odd:
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.byte $2A,$55,$AA,$7F,$7F,$7F,$60,$03,$E0
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box_color_even:
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.byte $55,$2A,$D5,$7F,$7F,$7F,$60,$03,$E0
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box_x1:
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.byte 16, 33, 0, 0, 24, 16, 15, 24, 39
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box_x2:
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.byte 24, 40, 34, 16, 40, 24, 16, 25, 40
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box_y1:
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.byte 130, 50, 42,120,120,159,121,121,101
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box_y2:
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.byte 159, 57, 43,121,121,160,160,160,120
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;==========================
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; draw box
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;==========================
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; which to draw in X
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; X preserved?
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draw_box:
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lda box_y1,X ; 3
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draw_box_outer:
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sta TEMPY ; 2
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tay ; 1
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lda hposn_low,Y ; 3
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sta GBASL ; 2
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lda hposn_high,Y ; 3
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sta GBASH ; 2
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ldy box_x1,X ; 3
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draw_box_inner:
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tya ; 1
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lsr ; 1
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lda box_color_odd,X ; 3
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bcc draw_color_odd ; 2 ; we might have these flipped
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draw_color_even:
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lda box_color_even,X ; 3
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draw_color_odd:
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sta (GBASL),Y ; 2
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iny ; 1
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tya ; 1
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cmp box_x2,X ; 3
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bne draw_box_inner ; 2
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inc TEMPY ; 2
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lda TEMPY ; 2
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cmp box_y2,X ; 3
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bne draw_box_outer ; 2
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rts ; 1
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companion_cube:
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.byte $6F,$3D ; .@@@@.@@ @.@@@@..
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.byte $07,$38 ; .@@@.... ...@@@..
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.byte $03,$38 ; .@@..... ....@@..
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.byte $30,$03 ; .....@@. @@......
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.byte $73,$33 ; .@@..@@@ @@..@@..
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.byte $73,$33 ; .@@..@@@ @@..@@..
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.byte $60,$01 ; ......@@ @.......
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.byte $43,$30 ; .@@....@ ....@@..
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.byte $07,$38 ; .@@@.... ...@@@..
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.byte $6F,$3D ; .@@@@.@@ @.@@@@..
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.byte $00,$00
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turret:
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.byte $E0,$83 ; .....@@ @@.....
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.byte $B0,$86 ; ....@@. .@@....
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.byte $B0,$87 ; ....@@= =@@....
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.byte $B0,$86 ; ....@@. .@@....
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.byte $B0,$87 ; ....@@= =@@....
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.byte $B0,$86 ; ....@@. .@@....
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.byte $B0,$86 ; ....@@. .@@....
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.byte $F0,$87 ; ....@@@ @@@....
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.byte $8C,$98 ; ..@@... ...@@..
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.byte $86,$B0 ; .@@.... ....@@.
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.byte $86,$B0 ; .@@.... ....@@.
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exit_sign:
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.byte $7F,$7F ; @@@@@@@ @@@@@@@
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.byte $1F,$7F ; @@@@@.. @@@@@@@
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.byte $3F,$7E ; @@@@@@. .@@@@@@
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.byte $7F,$7C ; @@@@@@@ ..@@@@@
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.byte $7F,$79 ; @@@@@@@ @..@@@@
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.byte $03,$70 ; @@..... ....@@@
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.byte $7F,$79 ; @@@@@@@ @..@@@@
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.byte $7F,$7C ; @@@@@@@ ..@@@@@
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.byte $3F,$7E ; @@@@@@. .@@@@@@
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.byte $1F,$7F ; @@@@@.. @@@@@@@
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.byte $7F,$7F ; @@@@@@@@@@@@@@@
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; note: these can't cross a page boundary or you'll get corruption
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;==========================
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; draw sprite
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;==========================
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; INL/INH is sprite
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; X is X location
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draw_sprite:
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stx draw_sprite_xpos+1
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draw_sprite_y_smc:
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lda #50 ; 2 ; Y position
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sta draw_sprite_y_end_smc+1
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sec
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sbc #11
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draw_sprite_outer:
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sta TEMPY ; 2
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tay ; 1
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lda hposn_low,Y ; 3
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clc
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draw_sprite_xpos:
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adc #37 ; Xpos=37
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sta GBASL ; 2
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lda hposn_high,Y ; 3
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sta GBASH ; 2
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ldy #0 ; 2
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lda (INL),Y
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sta (GBASL),Y
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iny
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lda (INL),Y
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sta (GBASL),Y
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inc INL
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inc INL
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inc TEMPY ; 2
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lda TEMPY ; 2
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draw_sprite_y_end_smc:
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cmp #50 ; 3
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bne draw_sprite_outer ; 2
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rts ; 1
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;====================================
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do_xdraw:
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; A and Y are 0 here.
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; X is left behind by the boot process?
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; set GBASL/GBASH
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; we really have to call this, otherwise it won't run
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; on some real hardware depending on setup of zero page at boot
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ldy #0
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ldx #139
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lda #96
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jsr HPOSN ; set screen position to X= (y,x) Y=(a)
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; saves X,Y,A to zero page
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; after Y= orig X/7
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; A and X are ??
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ldx #<our_shape ; load $E2 into A, X, and Y
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ldy #>our_shape ; our shape table is in ROM at $E2E2
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lda #0
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jsr XDRAW0 ; XDRAW 1 AT X,Y
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; Both A and X are 0 at exit
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; Z flag set on exit
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; Y varies
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rts
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;.byte $07,$00
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;.byte $10,$00, $1b,$00, $2e,$00
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;.byte $42,$00, $61,$00, $80,$00
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;.byte $8a,$00
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; crosshair
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.byte $1b,$6d,$39,$97,$12,$24,$24,$24
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.byte $24,$04,$00
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; portal
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.byte $1b,$24,$0c,$24,$0c
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.byte $15,$36,$0e,$36,$36,$1e,$36,$1e
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.byte $1c,$24,$1c,$24,$04,$00
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; sideways portal
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.byte $52,$0d
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.byte $0d,$0d,$6c,$24,$1f,$fc,$1f,$1f
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.byte $1f,$1f,$1f,$fe,$36,$0d,$6e,$0d
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.byte $05,$00
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; chell right
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our_shape:
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.byte $1b,$36,$36,$36,$0d,$df
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.byte $1b,$24,$0c,$24,$24,$1c,$24,$64
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.byte $69,$1e,$37,$2d,$1e,$77,$6e,$25
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.byte $2d,$2d,$f5,$ff,$13,$2d,$2d,$2d
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.byte $00
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; chell left
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.byte $09,$36,$36,$36,$1f,$4d,$09
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.byte $24,$1c,$24,$24,$0c,$24,$e4,$fb
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.byte $0e,$35,$3f,$0e,$f5,$fe,$27,$3f
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.byte $3f,$77,$6d,$11,$3f,$3f,$3f,$00
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; fireball
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.byte $12,$0c,$0c,$1c,$1c,$1e,$1e,$0e
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.byte $0e,$00
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; blue core
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.byte $fa,$24,$0d,$0d,$36,$9f
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.byte $3a,$3f,$3c,$3c,$2c,$3c,$0c,$25
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.byte $2d,$2d,$2d,$2e,$2e,$3e,$2e,$1e
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.byte $37,$3f,$07,$00
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