2016-12-16 01:21:51 +00:00
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processor 6502
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include "vcs.h"
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include "macro.h"
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include "xmacro.h"
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2018-10-01 01:07:45 +00:00
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;
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; This example draws a pseudo-3D road using the two missiles
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; and ball objects. With these, we'll draw the two shoulders
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; of the road, and also the dashed center line.
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;
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; Our plan is this: The two missiles and ball all start at the
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; same position on the horizon. As we go down the screen, we'll
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; move the three objects slightly based on the curve of the road.
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; The left shoulder of the road will be biased a little more to
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; the left, and the right shoulder will bias a little more right.
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; We can use the HMOVE registers for movement, since each object
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; will not need to move more than seven pixels on any given
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; scanline.
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;
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; It'd be easier if the scanlines went from bottom to top,
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; because we could just start at the horizontal center of the
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; screen and follow the road curve to the horizon, ending up
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; wherever the road takes us. But scanlines go top to bottom,
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; so we have to also do some preprocessing before the frame begins
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; to figure out where the road ends up.
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;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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2016-12-16 01:21:51 +00:00
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seg.u Variables
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org $80
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TrackFrac .byte ; fractional position along track
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Speed .byte ; speed of car
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TimeOfDay .word ; 16-bit time of day counter
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; Variables for preprocessing step
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XPos .word ; 16-bit X position
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XVel .word ; 16-bit X velocity
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TPos .word ; 16-bit track position
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TrackLookahead .byte ; current fractional track increment
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; Variables for track generation
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Random .byte ; random counter
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GenTarget .byte ; target of current curve
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GenDelta .byte ; curve increment
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GenCur .byte ; current curve value
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ZOfs .byte ; counter to draw striped center line
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Weather .byte ; bitmask for weather
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NumRoadSegments equ 28
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; Preprocessing result: X positions for all track segments
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RoadX0 REPEAT NumRoadSegments
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.byte
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REPEND
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; Generated track curve data
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TrackLen equ 5
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TrackData REPEAT TrackLen
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.byte
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REPEND
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InitialSpeed equ 10 ; starting speed
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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seg Code
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org $f000
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Start
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CLEAN_START
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lda #1
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sta Random
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lda #InitialSpeed
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sta Speed
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lda #0
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sta TimeOfDay+1
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lda #0
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sta Weather
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NextFrame
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VERTICAL_SYNC
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; Set up some values for road curve computation,
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; since we have some scanline left over.
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lda #0
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sta XVel
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sta XVel+1
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sta XPos
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lda #70 ; approx. center of screen
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sta XPos+1
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lda TrackFrac
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sta TPos
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lda #0
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sta TPos+1
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lda #10 ; initial lookahead
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sta TrackLookahead
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2018-08-26 13:19:09 +00:00
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; VSYNC+37+198+23 = 4+258 = 262 lines
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2016-12-16 01:21:51 +00:00
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2018-08-26 13:19:09 +00:00
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TIMER_SETUP 37
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2016-12-16 01:21:51 +00:00
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; Initialize array with X road positions
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jsr PreprocessCurve
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TIMER_WAIT
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; Now draw the main frame
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TIMER_SETUP 198
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jsr DrawSky
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jsr SetupRoadComponents
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jsr DrawRoad ; draw the road
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TIMER_WAIT
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2018-08-26 13:19:09 +00:00
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TIMER_SETUP 23
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2016-12-16 01:21:51 +00:00
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; Advance position on track
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; TrackFrac += Speed
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lda TrackFrac
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clc
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adc Speed
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sta TrackFrac
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bcc .NoGenTrack ; addition overflowed?
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jsr GenTrack ; yes, generate new track segment
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.NoGenTrack
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; TimeOfDay += 1
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inc TimeOfDay
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bne .NoTODInc
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inc TimeOfDay+1
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lda TimeOfDay+1
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; See if it's nighttime yet, and if the stars come out
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clc
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adc #8
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and #$3f
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cmp #$35
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ror
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sta Weather
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.NoTODInc
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TIMER_WAIT
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jmp NextFrame
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Compute road curve from bottom of screen to horizon.
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PreprocessCurve subroutine
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ldx #NumRoadSegments-1
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.CurveLoop
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; Modify X position
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; XPos += XVel (16 bit add)
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lda XPos
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clc
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adc XVel
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sta XPos
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lda XPos+1
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adc XVel+1
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sta XPos+1
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sta RoadX0,x ; store in RoadX0 array
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; Modify X velocity (slope)
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; XVel += TrackData[TPos]
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ldy TPos+1
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lda TrackData,y
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clc ; clear carry for ADC
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bmi .CurveLeft ; track slope negative?
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adc XVel
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sta XVel
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lda XVel+1
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adc #0 ; carry +1
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jmp .NoCurveLeft
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.CurveLeft
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adc XVel
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sta XVel
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lda XVel+1
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sbc #0 ; carry -1
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nop ; make the branch timings are the same
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.NoCurveLeft
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sta XVel+1
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; Advance TPos (TrackData index)
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; TPos += TrackLookahead
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lda TPos
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clc
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adc TrackLookahead
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sta TPos
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lda TPos+1
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adc #0
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sta TPos+1
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; Go to next segment
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inc TrackLookahead ; see further along track
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dex
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bpl .CurveLoop
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rts
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; Set road component X positions and enable registers
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SetupRoadComponents subroutine
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lda RoadX0
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sta HMCLR ; clear HMOVE registers
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sec
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sta WSYNC
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.DivideLoop
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sbc #15 ; subtract 15
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bcs .DivideLoop ; branch while carry still set
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adc #15
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tay
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lda HMoveTable,y ; lookup HMOVE value
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sta HMM0 ; set missile 0 fine pos
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sta HMBL ; set ball fine pos
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sta HMM1 ; set missile 1 fine pos
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sta RESM0 ; set missile 0 position
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sta RESBL ; set ball position
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sta RESM1 ; set missile 1 position
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sta WSYNC
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sta HMOVE
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; Make road components converge at horizon
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; This will require an additional HMOVE
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lda #$90 ; right 7 pixels
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ldy #$70 ; left 7 pixels
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ldx #$00 ; no movement
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2017-05-13 12:08:36 +00:00
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SLEEP 14 ; wait until safe to set regs
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2016-12-16 01:21:51 +00:00
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sta HMM0
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sty HMM1
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stx HMBL
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sta WSYNC
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sta HMOVE
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rts
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; Draw the sky, adding clouds and time-of-day colors.
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DrawDaytime subroutine
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lda TimeOfDay+1 ; offset into sunset color table
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and #$3f
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tay
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lda #16 ; initial height of sky segment
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.SkyLoop2
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tax ; height -> X
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pha ; push original height
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.SkyLoop
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lda SunsetColors,y ; get sunset color
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sta WSYNC ; start scanline
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sta COLUBK ; set background color
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lda SunsetColors+2,y ; get cloud color
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sta COLUPF ; set foreground color
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lda CloudPFData0,x ; load clouds -> playfield
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sta PF0
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lda CloudPFData1,x
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sta PF1
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lda CloudPFData2,x
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sta PF2
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dex
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bne .SkyLoop ; repeat until sky segment done
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iny ; next sky color
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tya
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and #$3f ; keep sky color in range 0-63
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tay ; sky color -> Y
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pla ; restore original segment height
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sec
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sbc #2 ; segment height - 2
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cmp #2 ; done with segments?
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bcs .SkyLoop2 ; no, repeat
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; Draw mountains
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; First, load mountain color
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lda TimeOfDay+1
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lsr
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lsr ; divide time-of-day by 4
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and #$f ; keep in range 0-15
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tax ; -> Y
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lda MountainColors,x ; load mountain color
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sta COLUPF ; set foreground
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lda GroundColors,x ; load ground color
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pha ; save it for later
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ldx #0
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stx PF0
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stx PF1 ; to avoid artifacts, we have to
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stx PF2 ; clear previous clouds
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.MtnLoop
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lda SunsetColors,y ; get sunset color
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sta WSYNC ; start scanline
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sta COLUBK ; set background color
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lda MtnPFData0,x ; load mountains -> playfield
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sta PF0
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lda MtnPFData1,x
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sta PF1
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lda MtnPFData2,x
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sta PF2
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iny ; next sky color
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tya
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and #$3f ; keep sky color in range 0-63
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tay ; sky color -> Y
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inx
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cpx #7 ; only 7 scanlines for the mountains
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bne .MtnLoop
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; Setup colors and enable road components
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pla ; restore ground color
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sta COLUBK ; set background
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lda #0
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sta PF0
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sta PF1
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sta PF2
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rts
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DrawSky
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bit Weather
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bmi DrawNight
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jmp DrawDaytime
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; Draw the night sky, with stars.
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DrawNight subroutine
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lda #6
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sta ENABL
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sta COLUPF
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ldy #0
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.MoreStars
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sta RESBL ; strobe the ball to display a star
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adc Start,y ; "randomize" the A register
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bmi .Delay1
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.Delay1
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ror
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bcc .Delay2
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.Delay2
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ror
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bcs .Delay3
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.Delay3
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ror
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bcs .Delay4
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.Delay4
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iny
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ldx INTIM
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cpx #$89 ; timer says we're done?
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bcs .MoreStars ; nope, make more stars
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lda #0
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sta ENABL ; disable ball
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rts
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DrawRoad subroutine
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lda #2
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sta ENAM0
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sta ENAM1 ; enable missiles
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sta COLUPF
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sta COLUP0
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sta COLUP1 ; set their colors too
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; Draw road
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lda TrackFrac
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asl
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sta WSYNC ; WSYNC so scanline starts at same place each time
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asl ; TrackFrac * 4
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sta ZOfs ; -> counter for animated stripe
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ldx #0 ; 0 is farthest segment
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.RoadLoop
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lda RoadColors,x ; color of sides and center line
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sta COLUP0
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sta COLUP1
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sta COLUPF
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lda RoadX0+1,x ; get next X coordinate
|
|
|
|
|
sec
|
|
|
|
|
sbc RoadX0,x ; subtract this X coordinate
|
|
|
|
|
clc
|
|
|
|
|
adc #7 ; add 7
|
|
|
|
|
tay ; -> Y
|
|
|
|
|
lda HMoveTable-3,y ; left side biased left
|
|
|
|
|
sta HMM0
|
|
|
|
|
lda HMoveTable,y ; center line
|
|
|
|
|
sta HMBL
|
|
|
|
|
lda HMoveTable+3,y ; right side biased right
|
|
|
|
|
sta HMM1
|
|
|
|
|
sta WSYNC
|
|
|
|
|
sta HMOVE
|
|
|
|
|
sta WSYNC
|
|
|
|
|
; Make dashed road stripe by using a counter
|
|
|
|
|
; initialized to the fractional track position,
|
|
|
|
|
; then subracting the PIA timer as an approximation
|
|
|
|
|
; to Z value.
|
|
|
|
|
lda ZOfs
|
|
|
|
|
sec
|
|
|
|
|
sbc INTIM
|
|
|
|
|
sta ZOfs ; ZOfs -= timer
|
|
|
|
|
rol
|
|
|
|
|
rol
|
|
|
|
|
rol ; shift left by 3
|
|
|
|
|
sta ENABL ; enable ball (bit 2)
|
|
|
|
|
sta WSYNC
|
|
|
|
|
lda RoadWidths,x ; lookup register for missile size
|
|
|
|
|
sta NUSIZ0 ; store missile 0 size
|
|
|
|
|
sta NUSIZ1 ; store missile 1 size
|
|
|
|
|
sta WSYNC
|
|
|
|
|
inx
|
|
|
|
|
cpx #NumRoadSegments-1
|
|
|
|
|
bne .RoadLoop ; repeat until all segments done
|
|
|
|
|
; Clean up road objects
|
|
|
|
|
lda #0
|
|
|
|
|
sta ENAM0
|
|
|
|
|
sta ENAM1
|
|
|
|
|
sta ENABL
|
|
|
|
|
sta COLUBK
|
|
|
|
|
sta NUSIZ0
|
|
|
|
|
sta NUSIZ1
|
|
|
|
|
rts
|
|
|
|
|
|
|
|
|
|
; Get next random number
|
|
|
|
|
NextRandom subroutine
|
|
|
|
|
lda Random
|
|
|
|
|
lsr
|
|
|
|
|
bcc .NoEor
|
|
|
|
|
eor #$d4
|
|
|
|
|
.NoEor:
|
|
|
|
|
sta Random
|
|
|
|
|
rts
|
|
|
|
|
|
|
|
|
|
; Generate next track byte
|
|
|
|
|
GenTrack subroutine
|
|
|
|
|
; Shift the existing track data one byte up
|
|
|
|
|
; (a[i] = a[i+1])
|
|
|
|
|
ldx #0
|
|
|
|
|
.ShiftTrackLoop
|
|
|
|
|
lda TrackData+1,x
|
|
|
|
|
sta TrackData,x
|
|
|
|
|
inx
|
|
|
|
|
cpx #TrackLen-1
|
|
|
|
|
bne .ShiftTrackLoop
|
|
|
|
|
; Modify our current track value and
|
|
|
|
|
; see if it intersects the target value
|
|
|
|
|
lda GenCur
|
|
|
|
|
clc
|
|
|
|
|
adc GenDelta
|
|
|
|
|
cmp GenTarget
|
|
|
|
|
beq .ChangeTarget ; target == cur?
|
|
|
|
|
bit GenTarget ; we need the sign flag
|
|
|
|
|
bmi .TargetNeg ; target<0?
|
|
|
|
|
bcs .ChangeTarget ; target>=0 && cur>=target?
|
|
|
|
|
bcc .NoChangeTarget ; branch always taken
|
|
|
|
|
.TargetNeg
|
|
|
|
|
bcs .NoChangeTarget ; target<0 && cur<target?
|
|
|
|
|
; Generate a new target value and increment value,
|
|
|
|
|
; and make sure the increment value is positive if
|
|
|
|
|
; the target is above the current value, and negative
|
|
|
|
|
; otherwise
|
|
|
|
|
.ChangeTarget
|
|
|
|
|
jsr NextRandom ; get a random value
|
|
|
|
|
and #$3f ; range 0..63
|
|
|
|
|
sec
|
|
|
|
|
sbc #$1f ; range -31..32
|
|
|
|
|
sta GenTarget ; -> target
|
|
|
|
|
cmp GenCur
|
|
|
|
|
bmi .TargetBelow ; current > target?
|
|
|
|
|
jsr NextRandom ; get a random value
|
|
|
|
|
and #$f ; mask to 0..15
|
|
|
|
|
jmp .TargetAbove
|
|
|
|
|
.TargetBelow
|
|
|
|
|
jsr NextRandom
|
|
|
|
|
ora #$f0 ; mask to -16..0
|
|
|
|
|
.TargetAbove
|
|
|
|
|
ora #1 ; to avoid 0 values
|
|
|
|
|
sta GenDelta ; -> delta
|
|
|
|
|
lda GenCur
|
|
|
|
|
.NoChangeTarget
|
|
|
|
|
; Store the value in GenCur, and also
|
|
|
|
|
; at the end of the TrackData array
|
|
|
|
|
sta GenCur
|
|
|
|
|
sta TrackData+TrackLen-1
|
|
|
|
|
rts
|
|
|
|
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
|
|
|
|
|
|
; HMOVE table from -7 to +8
|
|
|
|
|
HMoveTable
|
|
|
|
|
hex 7060504030201000f0e0d0c0b0a09080
|
|
|
|
|
|
|
|
|
|
; Sunset table
|
|
|
|
|
SunsetColors
|
|
|
|
|
hex 00000000a07060504446383efc0c9f9f
|
|
|
|
|
hex aeaeaeaeaeaeaeaeaeaeaeaeaeaeaeae
|
|
|
|
|
hex 9f9f9f0cfc3e384644506070a0000000
|
|
|
|
|
hex 00000000000000000000000000000000
|
|
|
|
|
hex 0000 ; for overflow
|
|
|
|
|
|
|
|
|
|
MountainColors
|
|
|
|
|
hex 00021012f4f6e6264604020000000000
|
|
|
|
|
GroundColors
|
|
|
|
|
hex 00c0c2c4c6c8c8e6e4e2e00000000000
|
|
|
|
|
|
|
|
|
|
RoadColors
|
|
|
|
|
hex 020202
|
|
|
|
|
hex 040404
|
|
|
|
|
hex 060606
|
|
|
|
|
hex 08080808
|
|
|
|
|
hex 0a0a0a0a0a
|
|
|
|
|
hex 0c0c0c0c0c0c
|
|
|
|
|
hex 0e0e0e0e0e0e0e0e0e
|
|
|
|
|
|
|
|
|
|
RoadWidths
|
|
|
|
|
hex 000000000000
|
|
|
|
|
hex 10101010
|
|
|
|
|
hex 1010101010
|
|
|
|
|
hex 202020202020
|
|
|
|
|
hex 202020202020202020
|
|
|
|
|
|
|
|
|
|
; Cloud data
|
|
|
|
|
CloudPFData0
|
|
|
|
|
.byte #%10000000
|
|
|
|
|
.byte #%11100000
|
|
|
|
|
.byte #%10000000
|
|
|
|
|
.byte #%00000000
|
|
|
|
|
.byte #%00000000
|
|
|
|
|
.byte #%10000000
|
|
|
|
|
.byte #%11100000
|
|
|
|
|
.byte #%00000000
|
|
|
|
|
|
|
|
|
|
CloudPFData1
|
|
|
|
|
.byte #%11000000
|
|
|
|
|
.byte #%11110000
|
|
|
|
|
.byte #%11100001
|
|
|
|
|
.byte #%00000011
|
|
|
|
|
.byte #%00000111
|
|
|
|
|
.byte #%11000000
|
|
|
|
|
.byte #%00000000
|
|
|
|
|
.byte #%00011000
|
|
|
|
|
|
|
|
|
|
CloudPFData2
|
|
|
|
|
.byte #%00000000
|
|
|
|
|
.byte #%00001110
|
|
|
|
|
.byte #%00011111
|
|
|
|
|
.byte #%00000111
|
|
|
|
|
.byte #%01100000
|
|
|
|
|
.byte #%11000000
|
|
|
|
|
.byte #%00000110
|
|
|
|
|
.byte #%00000000
|
|
|
|
|
|
|
|
|
|
; Mountain data
|
|
|
|
|
MtnPFData0
|
|
|
|
|
.byte #%00000000
|
|
|
|
|
.byte #%00000000
|
|
|
|
|
.byte #%00000000
|
|
|
|
|
.byte #%00000000
|
|
|
|
|
.byte #%00000000
|
|
|
|
|
.byte #%10000000
|
|
|
|
|
.byte #%11100000
|
|
|
|
|
|
|
|
|
|
MtnPFData1
|
|
|
|
|
.byte #%00000000
|
|
|
|
|
.byte #%00010000
|
|
|
|
|
.byte #%00110000
|
|
|
|
|
.byte #%01111000
|
|
|
|
|
.byte #%11111100
|
|
|
|
|
.byte #%11111110
|
|
|
|
|
.byte #%11111110
|
|
|
|
|
|
|
|
|
|
MtnPFData2
|
|
|
|
|
.byte #%00000000
|
|
|
|
|
.byte #%00000000
|
|
|
|
|
.byte #%00000000
|
|
|
|
|
.byte #%00000100
|
|
|
|
|
.byte #%00101110
|
|
|
|
|
.byte #%01111111
|
|
|
|
|
.byte #%11111111
|
|
|
|
|
|
|
|
|
|
CarSprite
|
|
|
|
|
.byte 0
|
|
|
|
|
.byte #%10000001;--
|
|
|
|
|
.byte #%10111101;--
|
|
|
|
|
.byte #%11111111;--
|
|
|
|
|
.byte #%10000001;--
|
|
|
|
|
.byte #%10111101;--
|
|
|
|
|
.byte #%01011010;--
|
|
|
|
|
.byte #%01011010;--
|
|
|
|
|
.byte #%01011010;--
|
|
|
|
|
.byte #%00100100;--
|
|
|
|
|
.byte #%11111111;--
|
|
|
|
|
.byte #%10111101;--
|
|
|
|
|
.byte #%00111100;--
|
|
|
|
|
|
|
|
|
|
; Epilogue
|
|
|
|
|
org $fffc
|
|
|
|
|
.word Start
|
|
|
|
|
.word Start
|
