midline: more optimizing
This commit is contained in:
Vince Weaver
parent
a9db68a74a
commit
e5b108298b
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@ -1,15 +1,24 @@
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; Blargh
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; a 256-byte midline demo for Outline 2023
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; by Vince `deater` Weaver
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; by Vince `deater` Weaver / dSr
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; requires an Apple IIe
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.include "zp.inc"
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.include "hardware.inc"
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; 198 bytes -- proof of concept
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; 76 bytes -- optimize Apple II Forever printing code
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; 183 bytes -- stable window
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; 248 bytes -- sine code added
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; 274 bytes -- after much frustration, things sorta working
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; 261 bytes -- use zp for sine generation
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; 257 bytes -- inline sine generation
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; 259 bytes -- fix sine generation initialization, shave some message print
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; 247 bytes -- start replacing sather delays with something more compact
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sine = $c00 ; location of sine table
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midline:
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@ -18,27 +27,28 @@ midline:
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;================================
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sta FULLGR
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sta SETMOUSETEXT
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sta SETMOUSETEXT ; enable mouse text for Apple char
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jsr initSineTable
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lda #0
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sta FRAME
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.include "sinetable.s" ; Y is FF after this
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; A = 1, X = $40
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iny ; needed?
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sty FRAME
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;====================================================
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; setup text page1 screen of "Apple II Forever" text
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;====================================================
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ldy #0
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; X is $40 which is probably OK
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; ldx #0
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restart:
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ldx #0
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iny
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tay ; reset Y to 0 (or 1 first time through)
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inx
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beq print_done
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print_loop:
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lda a2_string,X
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lda a2_string,Y
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beq restart
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jsr COUT ; output char in A to stdout
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inx
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iny
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bne print_loop
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print_done:
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@ -51,22 +61,25 @@ print_done:
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; "Understanding the Apple IIe"
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poll1:
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lda VBLANK ; Find end of VBL
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bmi poll1 ; Fall through at VBL
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lda VBLANK ; Find end of VBL
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bmi poll1 ; Fall through at VBL
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poll2:
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lda VBLANK
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bpl poll2 ; Fall through at VBL' ; 2
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bpl poll2 ; Fall through at VBL' ; 2
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lda $00 ; Now slew back in 17029 cycle loops ; 3
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lda $00 ;nop3 ; Now slew back in 17029 cycle loops ; 3
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lp17029:
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ldx #17 ; ; 2
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jsr wait_x_x_1k ; ; 17000
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jsr rts1 ; ; 12
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lda $00 ; nop3 ; 3
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lda $00 ; nop3 ; 3
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lda VBLANK ; Back to VBL yet? ; 4
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nop ; ; 2
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bmi lp17029 ; no, slew back ; 2/3
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; delay 17020
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lda #7 ; 2
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ldy #96 ; 2
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jsr size_delay ; 17012
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nop ; 2
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nop ; 2
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lda VBLANK ; Back to VBL yet? ; 4
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nop ; ; 2
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bmi lp17029 ; no, slew back ; 2/3
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@ -76,17 +89,11 @@ lp17029:
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cycle_start:
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; 192 + 70 (vblank) = 262
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; if 42 high, then day 220 on, 42 off
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; how start in middle?
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; 2
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top_smc:
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ldx #66 ; 2
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lda $00 ; nop3
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lda $00 ; nop3 ; 5
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bne top10 ; bra ; 3/2
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@ -195,17 +202,18 @@ vblank_start:
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sta top_smc+1 ; 4
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adc #56 ; 2
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sta bottom_smc+1 ; 4
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; 25
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ldx #4 ; 2
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jsr wait_x_x_1k ; 4000
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; 4027
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ldy #52 ; 2
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jsr wait_y_x_10 ; 520
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lda #1 ; 2
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ldy #244 ; 2
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; 29
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jsr size_delay ; 4520
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; 4549
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jmp cycle_start
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; +2
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delay_16_setgr:
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bit SET_GR
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delay_12:
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@ -230,7 +238,7 @@ skip:
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bne loop10 ; 2/3
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rts ; 6
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.if 0
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;===================================
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; wait x-reg times 1000
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;===================================
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@ -240,7 +248,7 @@ loop1k:
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pla ; 4
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nop ; 2
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nop ; 2
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wait_x_x_1k:
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wait_X_x_1k:
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ldy #98 ; wait x-reg times 1000 ; 2
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jsr wait_y_x_10 ; 980
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nop ; 2
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@ -248,6 +256,20 @@ wait_x_x_1k:
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bne loop1k ; 2/3
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rts1:
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rts ; 6
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.endif
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;=====================================
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; short delay by Bruce Clark
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; any delay between 8 to 589832 with res of 9
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;=====================================
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; 9*(256*A+Y)+8 + 12 for jsr/rts
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size_delay:
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delay_loop:
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cpy #1
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dey
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sbc #0
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bcs delay_loop
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rts
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a2_string:
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; 012345678901234567 8 9
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@ -256,49 +278,3 @@ a2_string:
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.byte 'I'+$80,'I'+$80,' '+$80,'F'+$80,'o'+$80,'r'+$80
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.byte 'e'+$80,'v'+$80,'e'+$80,'r'+$80,'!'+$80,'!'+$80
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.byte ' '+$80,'@'+$00,' '+$80,0
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initSineTable:
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ldy #$3f
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ldx #$00
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; Accumulate the delta (normal 16-bit addition)
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:
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lda value
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clc
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adc delta
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sta value
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lda value+1
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adc delta+1
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sta value+1
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; Reflect the value around for a sine wave
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sta sine+$c0,x
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sta sine+$80,y
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eor #$7f
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sta sine+$40,x
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sta sine+$00,y
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; Increase the delta, which creates the "acceleration" for a parabola
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lda delta
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; adc #$10 ; this value adds up to the proper amplitude
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adc #$08 ; this value adds up to the proper amplitude
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sta delta
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bcc :+
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inc delta+1
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:
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; Loop
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inx
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dey
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bpl :--
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rts
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value: .word 0
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delta: .word 0
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sine = $c00
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@ -0,0 +1,46 @@
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;=================================
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; fakes sines based on parabolas
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; based on code by White Flame from codebase64
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;=================================
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; makes 256 entries, min 0 max 127
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initSineTable:
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ldy #$3f
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ldx #$00
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; Accumulate the delta (16-bit addition)
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init_sine_loop:
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lda VALUE
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clc
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adc DELTA
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sta VALUE
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lda VALUE+1
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adc DELTA+1
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sta VALUE+1
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; Reflect the value around for a sine wave
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sta sine+$c0,x
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sta sine+$80,y
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eor #$7f
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sta sine+$40,x
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sta sine+$00,y
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; Increase the delta, which creates the
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; "acceleration" for a parabola
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lda DELTA
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adc #$08 ; this value adds up to the proper amplitude
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sta DELTA
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bcc init_sine_noflo
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inc DELTA+1
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init_sine_noflo:
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; Loop
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inx
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dey
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bpl init_sine_loop
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rts
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