mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-09-17 08:54:50 +00:00
700 lines
12 KiB
ArmAsm
700 lines
12 KiB
ArmAsm
;=======================================================================
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; Based on BASIC program posted by FozzTexx, originally written in 1987
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;=======================================================================
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; State:
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; 0: Launch Rocket
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; 1: Move Rocket
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; 2: Start Explosion
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; 3: Continue Explosion
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; Constants
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NUMSTARS = 16
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YSIZE = 160
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XSIZE = 280
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MARGIN = 24
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; Zero page addresses
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STATE = $EE
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OFFSET = $EF
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COLOR_GROUP = $F0
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X_VELOCITY = $F1
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Y_VELOCITY_H = $F2
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Y_VELOCITY_L = $F3
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MAX_STEPS = $F4
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XPOS_H = $F5
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XPOS_L = $F6
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YPOS_H = $F7
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YPOS_L = $F8
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PEAK = $F9
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CURRENT_STEP = $FA
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Y_OLD = $FB
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Y_OLDER = $FC
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X_OLD = $FD
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X_OLDER = $FE
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TEMPY = $FF
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draw_fireworks:
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jsr HOME ; clear screen
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jsr hgr ; set high-res, clear screen, page0
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lda #0
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sta STATE
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jsr draw_stars ; draw the stars
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fireworks_state_machine:
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; see if key pressed
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lda KEYPRESS ; check if keypressed
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bmi done_fireworks ; if so, exit
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lda STATE
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cmp #0
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bne s1
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jsr launch_firework
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jmp fireworks_state_machine
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s1:
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cmp #1
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bne s2
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jsr move_rocket
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jmp fireworks_state_machine
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s2:
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cmp #2
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bne s3
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jsr start_explosion
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jmp fireworks_state_machine
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s3:
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jsr continue_explosion
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jmp fireworks_state_machine
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done_fireworks:
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rts
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;===========================
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; LAUNCH_FIREWORK
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;===========================
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; cycles= 54+60+67+60+56+56+15+8+21+11 = 408
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launch_firework:
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jsr random16 ; 6+42
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lda SEEDL ; 3
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and #$4 ; 2
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sta COLOR_GROUP ; HGR color group (0 PG or 4 BO) ; 3
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;============
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; 54
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jsr random16 ; 6+42
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lda SEEDL ; 3
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and #$3 ; 2
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clc ; 2
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adc #$1 ; 2
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sta X_VELOCITY ; x velocity = 1..4 ; 3
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;===========
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; 60
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jsr random16 ; 6+42
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lda SEEDL ; 3
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and #$3 ; 2
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clc ; 2
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adc #$2 ; 2
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eor #$ff ; 2
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sta Y_VELOCITY_H ; y velocity = -3..-6 ; 3
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lda #0 ; 2
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sta Y_VELOCITY_L ; it's 8:8 fixed point ; 3
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;============
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; 67
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jsr random16 ; 6+42
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lda SEEDL ; 3
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and #$1f ; 2
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clc ; 2
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adc #33 ; 2
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sta MAX_STEPS ; 33..64 ; 3
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;============
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; 60
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; launch from the two hills
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jsr random16 ; 6+42
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lda SEEDL ; 3
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and #$3f ; 2
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sta XPOS_L ; base of 0..63 ; 3
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;============
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; 56
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jsr random16 ; 6+42
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lda SEEDL ; 3
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and #$1 ; 2
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beq right_hill ; 3
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;============
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; 56
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left_hill: ;-1
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lda X_VELOCITY ; nop ; 3
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lda X_VELOCITY ; nop ; 3
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lda X_VELOCITY ; nop ; 3
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nop ; 2
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lda #24 ; make it 24..87 ; 2
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jmp done_hill ; 3
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;===========
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; 15
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right_hill:
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lda X_VELOCITY ; 3
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eor #$ff ; 2
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sta X_VELOCITY ; 3
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inc X_VELOCITY ; aim toward middle ; 5
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lda #191 ; make it 191..254 ; 2
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;===========
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; 15
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done_hill:
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clc ; 2
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adc XPOS_L ; 3
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sta XPOS_L ; 3
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;===========
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; 8
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lda #YSIZE ; 2
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sta YPOS_H ; 3
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lda #0 ; fixed point 8:8 ; 2
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sta YPOS_L ; start at ground ; 3
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lda YPOS_H ; 3
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sta PEAK ; peak starts at ground ; 3
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lda #1 ; 2
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sta CURRENT_STEP ; 3
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;===========
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; 21
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lda #1 ; 2
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sta STATE ; move to launch ; 3
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rts ; 6
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;============
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; 11
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;===============
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; Move rocket
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;===============
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; cycles=???
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move_rocket:
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lda Y_OLD
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sta Y_OLDER
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lda YPOS_H
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sta Y_OLD
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lda X_OLD
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sta X_OLDER
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lda XPOS_L
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sta X_OLD
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; Move rocket
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lda XPOS_L
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clc
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adc X_VELOCITY
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sta XPOS_L ; adjust xpos
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; 16 bit add
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clc
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lda YPOS_L
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adc Y_VELOCITY_L
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sta YPOS_L
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lda YPOS_H
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adc Y_VELOCITY_H
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sta YPOS_H ; adjust ypos
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; adjust Y velocity, slow it down
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clc
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lda Y_VELOCITY_L
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adc #$20 ; $20 = 0.125
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sta Y_VELOCITY_L
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lda Y_VELOCITY_H
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adc #0
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sta Y_VELOCITY_H
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; if we went higher, adjust peak
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lda YPOS_H
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cmp PEAK
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bmi no_peak
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sta PEAK
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no_peak:
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;========================================
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; Check if out of bounds and stop moving
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;========================================
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lda XPOS_L ; if (xpos_l<=margin) too far left
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cmp #MARGIN
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bcc done_moving
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; Due to 256 wraparound, the above will catch this case???
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; cmp #XSIZE-MARGIN ; if (xpos_l>=(xsize-margin)) too far right
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; bcs done_moving
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lda YPOS_H ; if (ypos_h<=margin) too far up
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cmp #MARGIN
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bcc done_moving
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;======================
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; if falling downward
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;======================
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lda Y_VELOCITY_H
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bmi going_up ; if (y_velocity_h>0)
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; if too close to ground, explode
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lda YPOS_H ; if (ypos_h>=ysize-margin)
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cmp #(YSIZE-MARGIN)
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bcs done_moving
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; if fallen a bit past peak, explode
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sec ; if (ypos_h>ysize-(ysize-peak)/2)
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lda #YSIZE
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sbc PEAK
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lsr
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eor #$FF
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clc
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adc #1
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clc
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adc #YSIZE
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cmp YPOS_H
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bcc done_moving
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going_up:
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jmp done_bounds_checking
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done_moving:
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lda MAX_STEPS
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sta CURRENT_STEP
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done_bounds_checking:
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;==========================
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; if not done, draw rocket
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;==========================
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lda CURRENT_STEP
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cmp MAX_STEPS
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beq erase_rocket
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draw_rocket:
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; set hcolor to proper white (3 or 7)
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clc
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lda COLOR_GROUP
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adc #3
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tax
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lda colortbl,X ; get color from table
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sta HGR_COLOR
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; HPLOT X,Y: X= (y,x), Y=a
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ldx X_OLD
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lda Y_OLD
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ldy #0
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jsr hplot0 ; hplot(x_old,y_old);
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; HPLOT to X,Y X=(x,a), y=Y
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lda XPOS_L
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ldx #0
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ldy YPOS_H
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jsr hglin ; hplot_to(xpos_l,ypos_h);
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erase_rocket:
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; erase with proper color black (0 or 4)
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ldx COLOR_GROUP
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lda colortbl,X ; get color from table
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sta HGR_COLOR
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; HPLOT X,Y: X= (y,x), Y=a
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ldx X_OLDER
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lda Y_OLDER
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ldy #0
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jsr hplot0 ; hplot(x_old,y_old);
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; HPLOT to X,Y X=(x,a), y=Y
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lda X_OLD
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ldx #0
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ldy Y_OLD
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jsr hglin ; hplot_to(x_old,y_old);
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done_with_loop:
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lda CURRENT_STEP
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cmp MAX_STEPS
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bne not_done_with_launch
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lda #2
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sta STATE
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not_done_with_launch:
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; lda #$c0
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; jsr WAIT
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inc CURRENT_STEP
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rts
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;==================================
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; Start explosion near x_old, y_old
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;==================================
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; cycles =
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start_explosion:
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lda #0
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sta XPOS_H
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; Set X position
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jsr random16 ; 6+42
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lda SEEDL ; 3
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and #$f ; 0..15 ; 2
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sec ; 2
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sbc #8 ; -8..7 ; 2
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clc
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vmw:
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bmi blahblah
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adc X_OLD ; 3
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sta XPOS_L ; xpos=x_old+(random()%16)-8; x +/- 8 ; 3
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lda #0
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adc XPOS_H
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sta XPOS_H
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jmp blahblah2
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blahblah:
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adc X_OLD ; 3
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sta XPOS_L ; xpos=x_old+(random()%16)-8; x +/- 8 ; 3
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lda #$ff
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adc XPOS_H
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sta XPOS_H
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blahblah2:
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; FIXME: XPOS from 255-280. A hard problem. Makes everything
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; more complicated, 16-bit math
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; set Y position
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jsr random16 ; 6+42
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lda SEEDL ; 3
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and #$f ; 0..15 ; 2
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sec ; 2
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sbc #8 ; -8..7 ; 2
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adc Y_OLD ; 3
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sta YPOS_H ; ypos_h=y_old+(random()%16)-8; y +/- 8 ; 3
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; draw white (with fringes)
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lda COLOR_GROUP ; 3
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clc ; 2
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adc #$3 ; 2
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tax ; 2
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lda colortbl,X ; get color from table ; 4+
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sta HGR_COLOR ; 3
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; hplot(xpos,ypos_h); // draw at center of explosion
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; HPLOT X,Y: X= (y,x), Y=a
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ldx XPOS_L ; 3
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lda YPOS_H ; 3
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ldy #0 ; never above 255? ; 3
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jsr hplot0 ; hplot(x_old,y_old); ; 6+244
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; Spread the explosion
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ldy #1 ; 2
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sty TEMPY ; save Y ; 3
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lda #3 ; move to continue explosion ; 2
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sta STATE ; 3
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rts ; 6
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;===============================
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; Continue Explosion
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;===============================
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continue_explosion:
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ldy TEMPY ; 3
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;================================
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; Draw spreading dots in white
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cpy #9 ; 2
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beq explosion_erase ; ?
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; hcolor_equals(color_group+3);
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lda COLOR_GROUP ; 3
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clc ; 2
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adc #$3 ; 2
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tax ; 2
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lda colortbl,X ; get color from table ; 4+
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sta HGR_COLOR ; 3
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ldx TEMPY ; 3
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stx OFFSET ; 3
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jsr explosion ; 6+
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explosion_erase:
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;======================
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; erase old
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; erase with proper color black (0 or 4)
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ldx COLOR_GROUP ; 3
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lda colortbl,X ; get color from table ; 4+
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sta HGR_COLOR ; 3
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ldx TEMPY ; 3
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dex ; 2
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stx OFFSET ; 3
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jsr explosion ; 6
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done_with_explosion:
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lda #$c0 ;
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jsr WAIT ;
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inc TEMPY ; 5
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lda TEMPY ; 3
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cmp #10 ; 2
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beq explosion_done ; ?
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rts ; 6
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explosion_done:
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;==================================
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; randomly draw more explosions
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;==================================
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jsr random16 ; 6+42
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lda SEEDL ; 3
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and #$2 ; 2
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sta STATE ; 3
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; if 0, then move to state 0 (start over)
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; if 2, then move to state 2 (new random explosion)
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rts ; 6
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;===============================
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; Draw explosion rays
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;===============================
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;
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; Note: the western pixels don't do the full 16-bit math
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; as currently it's not possible for those to overflow 256
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;
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; cycles = 275+275+270+270+272+278+278+279+6=2203
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explosion:
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; HPLOT X,Y: X= (y,x), Y=a
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; Southeast pixel
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clc ; 2
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lda XPOS_L ; 3
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adc OFFSET ; 3
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tax ; 2
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lda XPOS_H ; 3
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adc #0 ; 2
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tay ; 2
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clc ; 2
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lda YPOS_H ; 3
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adc OFFSET ; 3
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jsr hplot0 ; hplot(xpos+o,ypos_h+o); ; 6+244
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;==============
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; 275
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; Northeast Pixel
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clc ; 2
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lda XPOS_L ; 3
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adc OFFSET ; 3
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tax ; 2
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lda XPOS_H ; 3
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adc #0 ; 2
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tay ; 2
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sec ; 2
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lda YPOS_H ; 3
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sbc OFFSET ; 3
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jsr hplot0 ; hplot(xpos+o,ypos_h-o); ; 6+244
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;==============
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; 275
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; Northwest Pixel
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sec ; 2
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lda XPOS_L ; 3
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sbc OFFSET ; 3
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tax ; 2
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ldy #0 ; 2
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sec ; 2
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lda YPOS_H ; 3
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sbc OFFSET ; 3
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jsr hplot0 ; hplot(xpos-o,ypos_h-o); NW ; 6+244
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;==============
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; 270
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; Southwest Pixel
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sec ; 2
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lda XPOS_L ; 3
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sbc OFFSET ; 3
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tax ; 2
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ldy #0 ; 2
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clc ; 2
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lda YPOS_H ; 3
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adc OFFSET ; 3
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jsr hplot0 ; hplot(xpos-o,ypos_h+o); SW ; 6+244
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;=============
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; 270
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; HPLOT X,Y: X= (y,x), Y=a
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; South Pixel
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ldx XPOS_L ; 3
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ldy XPOS_H ; 3
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clc ; 2
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lda OFFSET ; 3
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adc OFFSET ; 3
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adc OFFSET ; 3
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lsr ; 2
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adc YPOS_H ; 3
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jsr hplot0 ; hplot(xpos,ypos_h+(o*1.5)); S ; 6+244
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;=============
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; 272
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; North Pixel
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ldx XPOS_L ; 3
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ldy XPOS_H ; 3
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clc ; O O*1.5 NEG ; 2
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lda OFFSET ; 0 = 0 0 ; 3
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adc OFFSET ; 1 = 1 -1 ; 3
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adc OFFSET ; 2 = 3 -3 ; 3
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lsr ; 3 = 4 -4 ; 2
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eor #$FF ; 4 = 6 -6 ; 2
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clc ; 2
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adc #1 ; 2
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adc YPOS_H ; 3
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jsr hplot0 ; hplot(xpos,ypos_h-(o*1.5)); N ; 6+244
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;==============
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; 278
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; HPLOT X,Y: X= (y,x), Y=a
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; East Pixel
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clc ; 2
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lda OFFSET ; 3
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adc OFFSET ; 3
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adc OFFSET ; 3
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lsr ; 2
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adc XPOS_L ; 3
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tax ; 2
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lda #0 ; 2
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adc XPOS_H ; 3
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tay ; 2
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lda YPOS_H ; 3
|
|
jsr hplot0 ; hplot(xpos+(o*1.5),ypos_h); E ; 6+244
|
|
;==============
|
|
; 278
|
|
|
|
; West Pixel
|
|
clc ; O O*1.5 NEG ; 2
|
|
lda OFFSET ; 0 = 0 0 ; 3
|
|
adc OFFSET ; 1 = 1 -1 ; 3
|
|
adc OFFSET ; 2 = 3 -3 ; 3
|
|
lsr ; 3 = 4 -4 ; 2
|
|
eor #$FF ; 4 = 6 -6 ; 2
|
|
clc ; 2
|
|
adc #1 ; 2
|
|
adc XPOS_L ; 3
|
|
tax ; 2
|
|
ldy #0 ; 2
|
|
lda YPOS_H ; 3
|
|
jsr hplot0 ; hplot(xpos-(o*1.5),ypos_h); W ; 6+244
|
|
;==============
|
|
; 279
|
|
|
|
rts ; 6
|
|
|
|
|
|
|
|
;=============================
|
|
; Draw the stars
|
|
;=============================
|
|
; 7+ 280X + 5
|
|
; 16 stars = 4492
|
|
|
|
draw_stars:
|
|
; HCOLOR = 3, white (though they are drawn purple)
|
|
lda #$7f ; 2
|
|
sta HGR_COLOR ; 3
|
|
ldy #0 ; 2
|
|
;===========
|
|
; 7
|
|
|
|
star_loop:
|
|
tya ; 2
|
|
pha ; 3
|
|
|
|
; HPLOT X,Y
|
|
; X= (y,x), Y=a
|
|
|
|
ldx stars,Y ; 4+
|
|
lda stars+1,Y ; 4+
|
|
ldy #0 ; 2
|
|
|
|
jsr hplot0 ;6+244
|
|
|
|
pla ; 4
|
|
tay ; 2
|
|
|
|
iny ; 2
|
|
iny ; 2
|
|
cpy #NUMSTARS*2 ; 2
|
|
|
|
bne star_loop ; 3
|
|
;============
|
|
; 279
|
|
|
|
; -1
|
|
rts ; 6
|
|
|
|
stars: ; even x so they are purple
|
|
.byte 28,107, 108, 88, 126, 88, 136, 95
|
|
.byte 150,108, 148,120, 172,124, 180,109
|
|
.byte 216, 21, 164, 40, 124, 18, 60, 12
|
|
.byte 240,124, 94,125, 12, 22, 216,116
|
|
|