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raycast: dos whitespace undamage
This commit is contained in:
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@ -1,464 +1,464 @@
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;---------------------------------------
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;---------------------------------------
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; based on 1bir - 1 block interactive raycaster
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; based on 1bir - 1 block interactive raycaster
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; coded by huseyin kilic (wisdom)
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; coded by huseyin kilic (wisdom)
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; copyright (c) 2009-2013 crescent
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; copyright (c) 2009-2013 crescent
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.include "hardware.inc"
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.include "hardware.inc"
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; zero page
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; zero page
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V2 = $2D
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V2 = $2D
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COLOR = $30
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COLOR = $30
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RAYPOSX = $61
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RAYPOSX = $61
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RAYPOSXH = $62
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RAYPOSXH = $62
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RAYPOSY = $63
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RAYPOSY = $63
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RAYPOSYH = $64
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RAYPOSYH = $64
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STEPX = $66 ; leave 1 byte between x and y
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STEPX = $66 ; leave 1 byte between x and y
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STEPY = $68
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STEPY = $68
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PLAYERX = $69
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PLAYERX = $69
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PLAYERXH = $6a
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PLAYERXH = $6a
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PLAYERY = $6b
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PLAYERY = $6b
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PLAYERYH = $6c
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PLAYERYH = $6c
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DISTANCE = $70 ; reset in $bc00 and $bc0f calls
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DISTANCE = $70 ; reset in $bc00 and $bc0f calls
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ROWPTR = $d1
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ROWPTR = $d1
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ROWPTRH = $d2
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ROWPTRH = $d2
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LINEH_T = $d9
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LINEH_T = $d9
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WALL_HEIGHT = $f8
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WALL_HEIGHT = $f8
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FLOOR_SKY_HEIGHT= $f9
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FLOOR_SKY_HEIGHT= $f9
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; external value dependencies
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; external value dependencies
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HEADING = $81
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HEADING = $81
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SINADD = $9a
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SINADD = $9a
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COLORS = $b1 ; 3 bytes consecutively
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COLORS = $b1 ; 3 bytes consecutively
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; temp
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; temp
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CURRENTROW = $ff
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CURRENTROW = $ff
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; constants
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; constants
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sin_t = $1000
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sin_t = $1000
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blocksize = $28
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blocksize = $28
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;---------------------------------------
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;---------------------------------------
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; main
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; main
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;---------------------------------------
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;---------------------------------------
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main:
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main:
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jsr SETGR
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jsr SETGR
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bit FULLGR
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bit FULLGR
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lda #$20
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lda #$20
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sta HEADING
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sta HEADING
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;---------------------------------------
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;---------------------------------------
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; sin/cos table generator
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; sin/cos table generator
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;---------------------------------------
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;---------------------------------------
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; first generate sine for 0..63 (0..90 degrees)
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; first generate sine for 0..63 (0..90 degrees)
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lda #3
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lda #3
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sta SINADD
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sta SINADD
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lda #$00
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lda #$00
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tay
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tay
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gensin_loop:
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gensin_loop:
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sta sin_t,Y
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sta sin_t,Y
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iny
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iny
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clc
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clc
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] adc SINADD
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] adc SINADD
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ldx SINADD
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ldx SINADD
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dec sincount_t,X
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dec sincount_t,X
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bne gensin_loop
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bne gensin_loop
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dec SINADD
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dec SINADD
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bpl gensin_loop
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bpl gensin_loop
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; x = $00
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; x = $00
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; y = $40
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; y = $40
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; next generate
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; next generate
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gensin_loop2:
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gensin_loop2:
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lda sin_t,X
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lda sin_t,X
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sta sin_t+$0100,X ; copy at $100 so cosine easier
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sta sin_t+$0100,X ; copy at $100 so cosine easier
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sta sin_t-1+$40,Y ; store 90-180 degrees
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sta sin_t-1+$40,Y ; store 90-180 degrees
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eor #$ff ; invert
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eor #$ff ; invert
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sta sin_t+$80,X ; store for 180-270 degrees
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sta sin_t+$80,X ; store for 180-270 degrees
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sta sin_t-1+$c0,Y ; store for 270-360 degrees
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sta sin_t-1+$c0,Y ; store for 270-360 degrees
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inx
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inx
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dey
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dey
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bpl gensin_loop2
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bpl gensin_loop2
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;---------------------------------------
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;---------------------------------------
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; raycaster
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; raycaster
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;---------------------------------------
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;---------------------------------------
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loop_main:
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loop_main:
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; cast 40 rays for each screen column
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; cast 40 rays for each screen column
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; starting with rightmost one
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; starting with rightmost one
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; Y is used as global column index
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; Y is used as global column index
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; throughout the rest of the program
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; throughout the rest of the program
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ldy #39
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ldy #39
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loop_ray:
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loop_ray:
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; determine current ray's direction
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; determine current ray's direction
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; by taking player's current direction
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; by taking player's current direction
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; and fov into account
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; and fov into account
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; fov is 40 b-rads out of 256 b-rads
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; fov is 40 b-rads out of 256 b-rads
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tya
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tya
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clc
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clc
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adc HEADING
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adc HEADING
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;sec
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;sec
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sbc #19+1 ; half of the fov (+1 because of sec)
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sbc #19+1 ; half of the fov (+1 because of sec)
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tax
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tax
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; get sin/cos values accordingly
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; get sin/cos values accordingly
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; and copy player position to current ray position
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; and copy player position to current ray position
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; distance is reset on return from this call
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; distance is reset on return from this call
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jsr getsincos_copyplr2ray
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jsr getsincos_copyplr2ray
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; reset line row before each column gets drawn
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; reset line row before each column gets drawn
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; (needed in vertical line section)
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; (needed in vertical line section)
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; X is 0 here?
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; X is 0 here?
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stx CURRENTROW
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stx CURRENTROW
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loop_dist:
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loop_dist:
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; step along current ray's path and find distance
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; step along current ray's path and find distance
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inc DISTANCE
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inc DISTANCE
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; limit distance when it is needed in larger maps
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; limit distance when it is needed in larger maps
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; or open (wrapped) maps
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; or open (wrapped) maps
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; max distance = $29
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; max distance = $29
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; lda DISTANCE
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; lda DISTANCE
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; cmp #$29
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; cmp #$29
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; bcs skip_dist
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; bcs skip_dist
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; max distance = $40 (make sure ar is always 0 here)
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; max distance = $40 (make sure ar is always 0 here)
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; bit DISTANCE
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; bit DISTANCE
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; bvs skip_dist
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; bvs skip_dist
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; max DISTANCE = $80
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; max DISTANCE = $80
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bmi skip_dist
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bmi skip_dist
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jsr addsteptopos
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jsr addsteptopos
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; on return from last call, A is cell (block) value
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; on return from last call, A is cell (block) value
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; A == 0 means empty cell, so continue tracing
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; A == 0 means empty cell, so continue tracing
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beq loop_dist
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beq loop_dist
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skip_dist:
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skip_dist:
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; now A contains the value in reached map position
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; now A contains the value in reached map position
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; (or last cell value fetched if max distance is reached)
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; (or last cell value fetched if max distance is reached)
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; use A or X to colorize the block
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; use A or X to colorize the block
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; and #$07
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; and #$07
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; ora #$03
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; ora #$03
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sta COLORS+1
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sta COLORS+1
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; find out visible block height
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; find out visible block height
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; according to distance
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; according to distance
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ldx #$ff
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ldx #$ff
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; calculate visible block height through simple division
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; calculate visible block height through simple division
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lda #<blocksize
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lda #<blocksize
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loop_div:
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loop_div:
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inx
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inx
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; sec
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; sec
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sbc DISTANCE
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sbc DISTANCE
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bcs loop_div
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bcs loop_div
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; X = half of visible block height
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; X = half of visible block height
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txa
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txa
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;---------------------------------------
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;---------------------------------------
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; vertical line
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; vertical line
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;---------------------------------------
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;---------------------------------------
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; Y = x position (screen column)
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; Y = x position (screen column)
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; A = half height (zero height is ok)
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; A = half height (zero height is ok)
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cmp #24 ; height > 24?
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cmp #24 ; height > 24?
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bcc vline_validheight
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bcc vline_validheight
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lda #23 ; make sure max height = 24
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lda #23 ; make sure max height = 24
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vline_validheight:
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vline_validheight:
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asl ; calculate full height
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asl ; calculate full height
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sta WALL_HEIGHT ; store for looping below
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sta WALL_HEIGHT ; store for looping below
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eor #$ff ; subtract full height from screen height
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eor #$ff ; subtract full height from screen height
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; sec ; (48 rows)
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; sec ; (48 rows)
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adc #48+1 ; +1 because of sec
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adc #48+1 ; +1 because of sec
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lsr ; sky/floor heights are equal to each other
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lsr ; sky/floor heights are equal to each other
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sta FLOOR_SKY_HEIGHT
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sta FLOOR_SKY_HEIGHT
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; loop through 3 sections of one screen column
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; loop through 3 sections of one screen column
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; i.e. sky - wall - floor
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; i.e. sky - wall - floor
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vline_loop:
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vline_loop:
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;==========
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;==========
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; vline sky, 0 to FLOOR_SKY_HEIGHT
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; vline sky, 0 to FLOOR_SKY_HEIGHT
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; load color
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; load color
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lda #$77 ; sky blue
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lda #$77 ; sky blue
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sta COLOR
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sta COLOR
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lda FLOOR_SKY_HEIGHT
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lda FLOOR_SKY_HEIGHT
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sta V2
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sta V2
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lda #0
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lda #0
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jsr VLINE ; VLINE A,$2D at Y (Y preserved, A=V2)
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jsr VLINE ; VLINE A,$2D at Y (Y preserved, A=V2)
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;=================
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;=================
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; vline wall, FLOOR_SKY_HEIGHT to FLOOR_SKY_HEIGHT+WALL_HEIGHT
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; vline wall, FLOOR_SKY_HEIGHT to FLOOR_SKY_HEIGHT+WALL_HEIGHT
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ldx COLORS+1
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ldx COLORS+1
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stx COLOR
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stx COLOR
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; A already FLOOR_SKY_HEIGHT
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; A already FLOOR_SKY_HEIGHT
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clc
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clc
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adc WALL_HEIGHT
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adc WALL_HEIGHT
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sta V2
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sta V2
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lda FLOOR_SKY_HEIGHT
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lda FLOOR_SKY_HEIGHT
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jsr VLINE ; VLINE A,$2D at Y
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jsr VLINE ; VLINE A,$2D at Y
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;=============
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;=============
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; vline floor, WALL_HEIGHT+FLOOR_SKY_HEIGHT to 47
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; vline floor, WALL_HEIGHT+FLOOR_SKY_HEIGHT to 47
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ldx #$88
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ldx #$88
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stx COLOR
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stx COLOR
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; A already WALL_HEIGHT+FLOOR_SKY_HEIGHT
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; A already WALL_HEIGHT+FLOOR_SKY_HEIGHT
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ldx #47
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ldx #47
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stx V2
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stx V2
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jsr VLINE ; VLINE A,$2D at Y
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jsr VLINE ; VLINE A,$2D at Y
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;---------------------------------------
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;---------------------------------------
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; advance to next ray/column
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; advance to next ray/column
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dey
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dey
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bpl loop_ray
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bpl loop_ray
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;---------------------------------------
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;---------------------------------------
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; user input
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; user input
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;---------------------------------------
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;---------------------------------------
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; common preparation code to set up sin/cos and
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; common preparation code to set up sin/cos and
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; to copy player position to ray position to trace movement
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; to copy player position to ray position to trace movement
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; direction to determine if player hits a block
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; direction to determine if player hits a block
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; in case player actually tries to move forward or backwards
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; in case player actually tries to move forward or backwards
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ldx HEADING
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ldx HEADING
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jsr getsincos_copyplr2ray
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jsr getsincos_copyplr2ray
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; get joystick 2 status (lowest 4 bits)
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; get joystick 2 status (lowest 4 bits)
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; and check each bit to determine action
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; and check each bit to determine action
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lda KEYPRESS
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lda KEYPRESS
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beq done_user_input
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beq done_user_input
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cmp #'W'+$80
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cmp #'W'+$80
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bne skip_j1
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bne skip_j1
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; try to move forward
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; try to move forward
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pha
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pha
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jsr stepandcopy
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jsr stepandcopy
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pla
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pla
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skip_j1:
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skip_j1:
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cmp #'S'+$80
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cmp #'S'+$80
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bne skip_j2
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bne skip_j2
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; try to move backward
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; try to move backward
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pha
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pha
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jsr invertstepandcopy
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jsr invertstepandcopy
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pla
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pla
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skip_j2:
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skip_j2:
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cmp #'A'+$80
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cmp #'A'+$80
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bne skip_j3
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bne skip_j3
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; turn right
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; turn right
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dec HEADING
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dec HEADING
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dec HEADING
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dec HEADING
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skip_j3:
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skip_j3:
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cmp #'D'+$80
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cmp #'D'+$80
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bne done_user_input
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bne done_user_input
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; turn left
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; turn left
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inc HEADING
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inc HEADING
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inc HEADING
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inc HEADING
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done_user_input:
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done_user_input:
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bit KEYRESET ; clear keyboard buffer
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bit KEYRESET ; clear keyboard buffer
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; absolute jump, as carry is always 0 here
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; absolute jump, as carry is always 0 here
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jmp loop_main
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jmp loop_main
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;---------------------------------------
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;---------------------------------------
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; ray tracing subroutines
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; ray tracing subroutines
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;---------------------------------------
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;---------------------------------------
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; heart of tracing, very slow, because of looping
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; heart of tracing, very slow, because of looping
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; for x and y components and also because of
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; for x and y components and also because of
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; brute force approach
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; brute force approach
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addsteptopos:
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addsteptopos:
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ldx #$02
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ldx #$02
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loop_stepadd:
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loop_stepadd:
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lda STEPX,X ; & y
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lda STEPX,X ; & y
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ora #$7f ; sign extend 8 bit step value to 16 bit
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ora #$7f ; sign extend 8 bit step value to 16 bit
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bmi was_neg ; was negative *+4
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bmi was_neg ; was negative *+4
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lda #$00
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lda #$00
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was_neg:
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was_neg:
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pha
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pha
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;clc
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;clc
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lda STEPX,x ; & y
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lda STEPX,x ; & y
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adc RAYPOSX,x ; & y
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adc RAYPOSX,x ; & y
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sta RAYPOSX,x ; & y
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sta RAYPOSX,x ; & y
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pla
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pla
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adc RAYPOSXH,x ; & y
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adc RAYPOSXH,x ; & y
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sta RAYPOSXH,x ; & y
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sta RAYPOSXH,x ; & y
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dex
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dex
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dex
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dex
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bpl loop_stepadd
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bpl loop_stepadd
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|
||||||
; A = RAYPOSXH
|
; A = RAYPOSXH
|
||||||
|
|
||||||
; calculate index to look up the map cell
|
; calculate index to look up the map cell
|
||||||
; the map area is 8x8 bytes
|
; the map area is 8x8 bytes
|
||||||
; + instead of the usual y * 8 + x
|
; + instead of the usual y * 8 + x
|
||||||
; x * 8 + y done here, to save some bytes
|
; x * 8 + y done here, to save some bytes
|
||||||
; (just causing a flip of the map as a side effect)
|
; (just causing a flip of the map as a side effect)
|
||||||
asl
|
asl
|
||||||
asl
|
asl
|
||||||
asl
|
asl
|
||||||
asl
|
asl
|
||||||
|
|
||||||
; by doing ora instead of adc, it is possible to have
|
; by doing ora instead of adc, it is possible to have
|
||||||
; a closed area map in $ecb9
|
; a closed area map in $ecb9
|
||||||
adc RAYPOSYH
|
adc RAYPOSYH
|
||||||
tax
|
tax
|
||||||
lda map_t,X
|
lda map_t,X
|
||||||
step_exit:
|
step_exit:
|
||||||
rts
|
rts
|
||||||
|
|
||||||
|
|
||||||
;---------------------------------------
|
;---------------------------------------
|
||||||
; getsincos_copyplr2ray
|
; getsincos_copyplr2ray
|
||||||
;---------------------------------------
|
;---------------------------------------
|
||||||
|
|
||||||
getsincos_copyplr2ray:
|
getsincos_copyplr2ray:
|
||||||
lda sin_t,X ; sin(x)
|
lda sin_t,X ; sin(x)
|
||||||
sta STEPX
|
sta STEPX
|
||||||
lda sin_t+$40,X ; cos(x)
|
lda sin_t+$40,X ; cos(x)
|
||||||
sta STEPY
|
sta STEPY
|
||||||
|
|
||||||
; copy player position to ray position for a start
|
; copy player position to ray position for a start
|
||||||
; through the basic rom
|
; through the basic rom
|
||||||
|
|
||||||
copyplr2ray: ; $bc00 in c64 kernel?
|
copyplr2ray: ; $bc00 in c64 kernel?
|
||||||
|
|
||||||
ldx #$05 ; copy 5 bytes, from 69..6D to 61..65
|
ldx #$05 ; copy 5 bytes, from 69..6D to 61..65
|
||||||
copyloop:
|
copyloop:
|
||||||
lda $68,X
|
lda $68,X
|
||||||
sta $60,X
|
sta $60,X
|
||||||
dex
|
dex
|
||||||
bne copyloop
|
bne copyloop
|
||||||
stx DISTANCE ; side effect, needed?
|
stx DISTANCE ; side effect, needed?
|
||||||
|
|
||||||
rts
|
rts
|
||||||
|
|
||||||
;======================================
|
;======================================
|
||||||
; invert step and copy
|
; invert step and copy
|
||||||
;======================================
|
;======================================
|
||||||
invertstepandcopy:
|
invertstepandcopy:
|
||||||
; invert step variables for backward motion
|
; invert step variables for backward motion
|
||||||
|
|
||||||
invertstepx: ; from BFB8 in C64 ROM
|
invertstepx: ; from BFB8 in C64 ROM
|
||||||
lda $66
|
lda $66
|
||||||
eor #$ff
|
eor #$ff
|
||||||
sta $66
|
sta $66
|
||||||
|
|
||||||
invertstepy:
|
invertstepy:
|
||||||
lda STEPY
|
lda STEPY
|
||||||
eor #$ff
|
eor #$ff
|
||||||
sta STEPY
|
sta STEPY
|
||||||
|
|
||||||
;=======================================
|
;=======================================
|
||||||
; stepandcopy
|
; stepandcopy
|
||||||
;=======================================
|
;=======================================
|
||||||
stepandcopy:
|
stepandcopy:
|
||||||
; see if player can move to the direction desired
|
; see if player can move to the direction desired
|
||||||
jsr addsteptopos
|
jsr addsteptopos
|
||||||
|
|
||||||
bne step_exit ; no, return without doing anything
|
bne step_exit ; no, return without doing anything
|
||||||
|
|
||||||
; yes, move player by
|
; yes, move player by
|
||||||
; copying ray position to player position
|
; copying ray position to player position
|
||||||
; through the basic rom
|
; through the basic rom
|
||||||
|
|
||||||
copyray2plr: ; BC0f in c64 ROM
|
copyray2plr: ; BC0f in c64 ROM
|
||||||
|
|
||||||
ldx #$6
|
ldx #$6
|
||||||
r2_loop:
|
r2_loop:
|
||||||
lda $60,X
|
lda $60,X
|
||||||
sta $68,X
|
sta $68,X
|
||||||
dex
|
dex
|
||||||
bne r2_loop
|
bne r2_loop
|
||||||
stx DISTANCE
|
stx DISTANCE
|
||||||
rts
|
rts
|
||||||
|
|
||||||
;---------------------------------------
|
;---------------------------------------
|
||||||
; data
|
; data
|
||||||
;---------------------------------------
|
;---------------------------------------
|
||||||
|
|
||||||
; number of sin additions (backwards)
|
; number of sin additions (backwards)
|
||||||
sincount_t:
|
sincount_t:
|
||||||
.byte 6,14,19,25
|
.byte 6,14,19,25
|
||||||
;---------------------------------------
|
;---------------------------------------
|
||||||
|
|
||||||
.if 0
|
.if 0
|
||||||
|
|
||||||
map_t:
|
map_t:
|
||||||
.byte $ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff
|
.byte $ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff
|
||||||
.byte $55,$00,$00,$00,$00,$00,$00,$55
|
.byte $55,$00,$00,$00,$00,$00,$00,$55
|
||||||
.byte $55,$00,$44,$00,$00,$00,$00,$55
|
.byte $55,$00,$44,$00,$00,$00,$00,$55
|
||||||
.byte $55,$00,$00,$00,$00,$11,$00,$55
|
.byte $55,$00,$00,$00,$00,$11,$00,$55
|
||||||
.byte $55,$22,$00,$00,$00,$00,$00,$55
|
.byte $55,$22,$00,$00,$00,$00,$00,$55
|
||||||
.byte $55,$00,$00,$99,$00,$00,$00,$55
|
.byte $55,$00,$00,$99,$00,$00,$00,$55
|
||||||
.byte $55,$00,$00,$00,$00,$00,$00,$55
|
.byte $55,$00,$00,$00,$00,$00,$00,$55
|
||||||
.byte $ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff
|
.byte $ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff
|
||||||
|
|
||||||
|
|
||||||
.endif
|
.endif
|
||||||
|
|
||||||
map_t:
|
map_t:
|
||||||
.byte $ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff
|
.byte $ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff
|
||||||
.byte $55,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$55
|
.byte $55,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$55
|
||||||
.byte $55,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$55
|
.byte $55,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$55
|
||||||
.byte $55,$00,$11,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$55
|
.byte $55,$00,$11,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$55
|
||||||
.byte $55,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$55
|
.byte $55,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$55
|
||||||
.byte $55,$00,$00,$00,$00,$00,$22,$00,$00,$00,$00,$00,$00,$00,$00,$55
|
.byte $55,$00,$00,$00,$00,$00,$22,$00,$00,$00,$00,$00,$00,$00,$00,$55
|
||||||
.byte $55,$00,$00,$00,$00,$22,$22,$22,$00,$00,$00,$00,$00,$00,$00,$55
|
.byte $55,$00,$00,$00,$00,$22,$22,$22,$00,$00,$00,$00,$00,$00,$00,$55
|
||||||
.byte $55,$00,$00,$00,$00,$00,$22,$00,$00,$00,$00,$00,$00,$00,$00,$55
|
.byte $55,$00,$00,$00,$00,$00,$22,$00,$00,$00,$00,$00,$00,$00,$00,$55
|
||||||
.byte $55,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$55
|
.byte $55,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$55
|
||||||
.byte $55,$00,$00,$00,$00,$00,$00,$00,$00,$00,$33,$00,$00,$00,$00,$55
|
.byte $55,$00,$00,$00,$00,$00,$00,$00,$00,$00,$33,$00,$00,$00,$00,$55
|
||||||
.byte $55,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$55
|
.byte $55,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$55
|
||||||
.byte $55,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$55
|
.byte $55,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$55
|
||||||
.byte $55,$00,$99,$99,$11,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$55
|
.byte $55,$00,$99,$99,$11,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$55
|
||||||
.byte $55,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$55
|
.byte $55,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$55
|
||||||
.byte $55,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$55
|
.byte $55,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$55
|
||||||
.byte $ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff
|
.byte $ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff
|
||||||
|
|
||||||
|
Loading…
Reference in New Issue
Block a user