bubble: size optimize a bit, under 2k now

graphics/hgr/bubble_universe/Makefile

@@ -39,7 +39,7 @@ bubble.o:	bubble.s hgr_clear_part.s sin_unrolled.s
 BUBBLE_TINY:	bubble_tiny.o
 	ld65 -o BUBBLE_TINY bubble_tiny.o -C $(LINKER_SCRIPTS)/apple2_c00.inc
 
-bubble_tiny.o:	bubble_tiny.s hgr_clear_part.s sin_unrolled.s
+bubble_tiny.o:	bubble_tiny.s hgr_clear_part.s sin_unrolled.s hgr_clear_codegen.s
 	ca65 -o bubble_tiny.o bubble_tiny.s -l bubble_tiny.lst
 
 ###

graphics/hgr/bubble_universe/bubble_tiny.s

@@ -15,6 +15,7 @@
 ; 2560 bytes -- full version with keypress to adjust
 ; 2326 bytes -- alignment turned off
 ; 2311 bytes -- optimize mod table generation
+; 1447 bytes -- first attempt at hgr_clear codegen
 
 ; soft-switches
 
@@ -49,6 +50,11 @@ V		= $D9
 
 HGR_PAGE	= $E6
 
+INL		= $FC
+INH		= $FD
+OUTL		= $FE
+OUTH		= $FF
+
 ; const
 
 ;NUM		= 32
@@ -61,6 +67,8 @@ bubble:
 
 	jsr	hgr_make_tables
 
+	jsr	hgr_clear_codegen
+
 	;=======================
 	; init graphics
 
@@ -90,7 +98,20 @@ next_frame:
 	; "fast" clear screen
 
 
-.include "hgr_clear_part.s"
+
+;.include "hgr_clear_part.s"
+
+
+	lda	#0		; color
+	ldy	HGR_PAGE
+	cpy	#$40
+	beq	do_clear_page2
+do_clear_page1:				; replace with jump table?
+	jsr	hgr_page1_clearscreen
+	jmp	done_clear_page
+do_clear_page2:
+	jsr	hgr_page2_clearscreen
+done_clear_page:
 
 	; reset I*T
 
@@ -366,6 +387,9 @@ log_lookup:
 
 ; floor(s*sin((x-96)*PI*2/256.0)+48.5);
 
+
+.include "hgr_clear_codegen.s"
+
 .align $100
 sines:
 	.byte $13,$12,$12,$11,$10,$10,$0F,$0E,$0E,$0D,$0D,$0C,$0C,$0B,$0B,$0B

graphics/hgr/bubble_universe/hgr_clear_codegen.s

@@ -0,0 +1,124 @@
+hgr_page1_clearscreen	=	$7000
+hgr_page2_clearscreen	=	$7300
+
+
+hgr_clear_codegen:
+	;========================
+	; set up output pointers
+
+	lda	#<(hgr_page1_clearscreen)
+	sta	OUTL
+	sta	INL
+
+	lda	#>(hgr_page1_clearscreen)
+	sta	OUTH
+	lda	#>(hgr_page2_clearscreen)
+	sta	INH
+
+	;=====================
+	; set up prolog
+
+	lda	#$A0				; ldy
+	jsr	write_both
+
+	lda	#8				; only part of screen
+	jsr	write_both
+
+	ldx	#0
+hgr_clear_codegen_loop:
+	lda	#$99		; STA
+	jsr	write_both
+
+	lda	hposn_low,X
+	jsr	write_both
+
+	lda	hposn_high,X
+	ora	#$20
+	pha
+	jsr	write_p1
+	pla
+	eor	#$60
+	jsr	write_p2
+
+	inx
+	cpx	#192
+	bne	hgr_clear_codegen_loop
+
+	;======================================
+	; write epilog
+
+	; TODO: replace with memcpy of some sort?
+
+	lda	#$C8			; INY
+	jsr	write_both
+
+	lda	#$C0			; CPY
+	jsr	write_both
+
+	lda	#32			; end value
+	jsr	write_both
+
+	lda	#$F0			; beq
+	jsr	write_both
+
+	lda	#$03			; +3
+	jsr	write_both
+
+	lda	#$4C			; JMP
+	jsr	write_both
+
+	lda	#<(hgr_page1_clearscreen+2)
+	jsr	write_both
+
+	lda	#>(hgr_page1_clearscreen+2)
+	jsr	write_p1
+	lda	#>(hgr_page2_clearscreen+2)
+	jsr	write_p2
+
+
+	lda	#$60			; RTS
+	jsr	write_both
+
+	rts				; tail call
+
+
+	;=============================
+	;
+write_both:
+
+	pha
+	jsr	write_p2
+	pla
+
+	; fallthrough
+
+write_p1:
+	ldy	#0
+	sta	(OUTL),Y
+
+	clc
+	lda	OUTL
+	adc	#1
+	sta	OUTL
+	lda	#0
+	adc	OUTH
+	sta	OUTH
+
+	rts
+
+
+write_p2:
+
+	ldy	#0
+	sta	(INL),Y
+
+	clc
+	lda	INL
+	adc	#1
+	sta	INL
+	lda	#0
+	adc	INH
+	sta	INH
+
+	rts
+