mode7: break out the utils into separate routines
This commit is contained in:
Vince Weaver
parent
a4ad2010c2
commit
ebd22ed243
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@ -0,0 +1,20 @@
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;==========================================================
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; set_text_page0
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;==========================================================
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;
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set_text_page0:
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bit PAGE0 ; set page0
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bit TEXT ; set text mode
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rts
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;==========================================================
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; set_gr_page0
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;==========================================================
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;
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set_gr_page0:
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bit PAGE0 ; set page 0
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bit LORES ; Lo-res graphics
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bit TEXTGR ; mixed gr/text mode
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bit SET_GR ; set graphics
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rts
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@ -0,0 +1,205 @@
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;=====================================================================
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;= ROUTINES
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;=====================================================================
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clear_screens:
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;===================================
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; Clear top/bottom of page 0
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;===================================
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lda #$0
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sta DRAW_PAGE
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jsr clear_top
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jsr clear_bottom
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;===================================
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; Clear top/bottom of page 1
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;===================================
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lda #$4
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sta DRAW_PAGE
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jsr clear_top
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jsr clear_bottom
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rts
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;================================
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; hlin_setup
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;================================
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; put address in GBASL/GBASH
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; Ycoord in A, Xcoord in Y
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hlin_setup:
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sty TEMPY ; 3
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tay ; y=A ; 2
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lda gr_offsets,Y ; lookup low-res memory address ; 4
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clc ; 2
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adc TEMPY ; 3
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sta GBASL ; 3
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iny ; 2
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lda gr_offsets,Y ; 4
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adc DRAW_PAGE ; add in draw page offset ; 3
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sta GBASH ; 3
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rts ; 6
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;===========
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; 35
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;================================
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; hlin_double:
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;================================
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; HLIN Y, V2 AT A
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; Y, X, A trashed
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; start at Y, draw up to and including X
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hlin_double:
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;int hlin_double(int page, int x1, int x2, int at) {
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jsr hlin_setup ; 41
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sec ; 2
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lda V2 ; 3
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sbc TEMPY ; 3
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tax ; 2
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inx ; 2
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;===========
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; 53
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; fallthrough
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;=================================
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; hlin_double_continue: width
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;=================================
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; width in X
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hlin_double_continue:
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ldy #0 ; 2
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lda COLOR ; 3
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hlin_double_loop:
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sta (GBASL),Y ; 6
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inc GBASL ; 5
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dex ; 2
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bne hlin_double_loop ; 2nt/3
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rts ; 6
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;=============
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; 53+5+X*16+5
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;================================
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; hlin_single:
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;================================
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; HLIN Y, V2 AT A
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; Y, X, A trashed
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hlin_single:
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jsr hlin_setup
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sec
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lda V2
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sbc TEMPY
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tax
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; fallthrough
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;=================================
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; hlin_single_continue: width
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;=================================
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; width in X
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hlin_single_continue:
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hlin_single_top:
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lda COLOR
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and #$f0
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sta COLOR
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hlin_single_top_loop:
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ldy #0
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lda (GBASL),Y
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and #$0f
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ora COLOR
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sta (GBASL),Y
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inc GBASL
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dex
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bne hlin_single_top_loop
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rts
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hlin_single_bottom:
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lda COLOR
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and #$0f
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sta COLOR
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hlin_single_bottom_loop:
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ldy #0
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lda (GBASL),Y
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and #$f0
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sta (GBASL),Y
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inc GBASL
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dex
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bne hlin_single_bottom_loop
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rts
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;=============================
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; clear_top
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;=============================
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clear_top:
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lda #$00
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;=============================
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; clear_top_a
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;=============================
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clear_top_a:
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sta COLOR
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; VLIN Y, V2 AT A
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lda #40
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sta V2
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lda #0
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clear_top_loop:
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ldy #0
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pha
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jsr hlin_double
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pla
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clc
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adc #$2
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cmp #40
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bne clear_top_loop
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rts
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clear_bottom:
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lda #$a0 ; NORMAL space
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sta COLOR
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lda #40
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sta V2
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clear_bottom_loop:
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ldy #0
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pha
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jsr hlin_double
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pla
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clc
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adc #$2
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cmp #48
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bne clear_bottom_loop
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rts
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; move these to zero page for slight speed increase?
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gr_offsets:
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.word $400,$480,$500,$580,$600,$680,$700,$780
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.word $428,$4a8,$528,$5a8,$628,$6a8,$728,$7a8
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.word $450,$4d0,$550,$5d0,$650,$6d0,$750,$7d0
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@ -0,0 +1,16 @@
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;======================
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; memset
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;======================
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; a=value
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; x=length
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; MEMPTRL/MEMPTRH is address
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memset:
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ldy #0
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memset_loop:
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sta MEMPTRL,Y
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iny
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dex
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bne memset_loop
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rts
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@ -0,0 +1,24 @@
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;==========
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; page_flip
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;==========
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page_flip:
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lda DISP_PAGE ; 3
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beq page_flip_show_1 ; 2nt/3
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page_flip_show_0:
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bit PAGE0 ; 4
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lda #4 ; 2
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sta DRAW_PAGE ; DRAW_PAGE=1 ; 3
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lda #0 ; 2
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sta DISP_PAGE ; DISP_PAGE=0 ; 3
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rts ; 6
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page_flip_show_1:
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bit PAGE1 ; 4
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sta DRAW_PAGE ; DRAW_PAGE=0 ; 3
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lda #1 ; 2
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sta DISP_PAGE ; DISP_PAGE=1 ; 3
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rts ; 6
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;====================
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; DISP_PAGE=0 26
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; DISP_PAGE=1 24
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@ -0,0 +1,115 @@
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;=================
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; load RLE image
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;=================
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; Output is BASH/BASL
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; Input is in GBASH/GBASL
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load_rle_gr:
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lda #$0
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tay ; init Y to 0
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sta TEMP ; stores the xcoord
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sta CV ; ycoord=0
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jsr load_and_increment ; load xsize
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sta CH
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rle_loop:
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jsr load_and_increment
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cmp #$A1 ; if 0xa1
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beq rle_done ; we are done
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pha
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and #$f0 ; mask
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cmp #$a0 ; see if special AX
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beq decompress_special
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pla ; note, PLA sets flags!
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ldx #$1 ; only want to print 1
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bne decompress_run
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decompress_special:
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pla
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and #$0f ; check if was A0
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bne decompress_color ; if A0 need to read run, color
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decompress_large:
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jsr load_and_increment ; get run length
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decompress_color:
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tax ; put runlen into X
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jsr load_and_increment ; get color
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decompress_run:
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rle_run_loop:
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sta (BASL),y ; write out the value
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inc BASL ; increment the pointer
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bne rle_skip3 ; if wrapped
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inc BASH ; then increment the high value
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rle_skip3:
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pha ; store colore for later
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inc TEMP ; increment the X value
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lda TEMP
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cmp CH ; compare against the image width
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bcc rle_not_eol ; if less then keep going
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lda BASL ; cheat to avoid a 16-bit add
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cmp #$a7 ; we are adding 0x58 to get
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bcc rle_add_skip ; to the next line
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inc BASH
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rle_add_skip:
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clc
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adc #$58 ; actually do the 0x58 add
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sta BASL ; and store it back
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inc CV ; add 2 to ypos
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inc CV ; each "line" is two high
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lda CV ; load value
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cmp #15 ; if it's greater than 14 it wraps
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bcc rle_no_wrap ; Thanks Woz
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lda #$0 ; we wrapped, so set to zero
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sta CV
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; when wrapping have to sub 0x3d8
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sec ; this is a 16-bit subtract routine
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lda BASL
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sbc #$d8 ; LSB
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sta BASL
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lda BASH ; MSB
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sbc #$3 ;
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sta BASH
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rle_no_wrap:
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lda #$0 ; set X value back to zero
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sta TEMP
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rle_not_eol:
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pla ; restore color
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dex
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bne rle_run_loop ; if not zero, keep looping
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beq rle_loop ; and branch always
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rle_done:
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lda #$15 ; move the cursor somewhere sane
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sta CV
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rts
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load_and_increment:
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lda (GBASL),y ; load value ; 5?
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inc GBASL ; 5?
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bne lskip2 ; 2nt/3
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inc GBASH ; 5?
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lskip2:
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rts ; 6
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@ -2,182 +2,6 @@
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;= ROUTINES
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;=====================================================================
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clear_screens:
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;===================================
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; Clear top/bottom of page 0
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;===================================
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lda #$0
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sta DRAW_PAGE
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jsr clear_top
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jsr clear_bottom
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;===================================
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; Clear top/bottom of page 1
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;===================================
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lda #$4
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sta DRAW_PAGE
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jsr clear_top
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jsr clear_bottom
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rts
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;==========
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; page_flip
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;==========
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page_flip:
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lda DISP_PAGE ; 3
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beq page_flip_show_1 ; 2nt/3
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page_flip_show_0:
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bit PAGE0 ; 4
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lda #4 ; 2
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sta DRAW_PAGE ; DRAW_PAGE=1 ; 3
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lda #0 ; 2
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sta DISP_PAGE ; DISP_PAGE=0 ; 3
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rts ; 6
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page_flip_show_1:
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bit PAGE1 ; 4
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sta DRAW_PAGE ; DRAW_PAGE=0 ; 3
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lda #1 ; 2
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sta DISP_PAGE ; DISP_PAGE=1 ; 3
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rts ; 6
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;====================
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; DISP_PAGE=0 26
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; DISP_PAGE=1 24
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;======================
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; memset
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;======================
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; a=value
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; x=length
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; MEMPTRL/MEMPTRH is address
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memset:
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ldy #0
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memset_loop:
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sta MEMPTRL,Y
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iny
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dex
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bne memset_loop
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rts
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;=================
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; load RLE image
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;=================
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; Output is BASH/BASL
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; Input is in GBASH/GBASL
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load_rle_gr:
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lda #$0
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tay ; init Y to 0
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sta TEMP ; stores the xcoord
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sta CV ; ycoord=0
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jsr load_and_increment ; load xsize
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sta CH
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rle_loop:
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jsr load_and_increment
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cmp #$A1 ; if 0xa1
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beq rle_done ; we are done
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pha
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and #$f0 ; mask
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cmp #$a0 ; see if special AX
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beq decompress_special
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pla ; note, PLA sets flags!
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ldx #$1 ; only want to print 1
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bne decompress_run
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decompress_special:
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pla
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and #$0f ; check if was A0
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bne decompress_color ; if A0 need to read run, color
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decompress_large:
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jsr load_and_increment ; get run length
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decompress_color:
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tax ; put runlen into X
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jsr load_and_increment ; get color
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decompress_run:
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rle_run_loop:
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sta (BASL),y ; write out the value
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inc BASL ; increment the pointer
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bne rle_skip3 ; if wrapped
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inc BASH ; then increment the high value
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rle_skip3:
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pha ; store colore for later
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inc TEMP ; increment the X value
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lda TEMP
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cmp CH ; compare against the image width
|
||||
bcc rle_not_eol ; if less then keep going
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lda BASL ; cheat to avoid a 16-bit add
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cmp #$a7 ; we are adding 0x58 to get
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bcc rle_add_skip ; to the next line
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inc BASH
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rle_add_skip:
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clc
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adc #$58 ; actually do the 0x58 add
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sta BASL ; and store it back
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|
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inc CV ; add 2 to ypos
|
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inc CV ; each "line" is two high
|
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|
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lda CV ; load value
|
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cmp #15 ; if it's greater than 14 it wraps
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bcc rle_no_wrap ; Thanks Woz
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lda #$0 ; we wrapped, so set to zero
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sta CV
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|
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; when wrapping have to sub 0x3d8
|
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sec ; this is a 16-bit subtract routine
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lda BASL
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sbc #$d8 ; LSB
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sta BASL
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lda BASH ; MSB
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sbc #$3 ;
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sta BASH
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rle_no_wrap:
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lda #$0 ; set X value back to zero
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sta TEMP
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rle_not_eol:
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pla ; restore color
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dex
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bne rle_run_loop ; if not zero, keep looping
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beq rle_loop ; and branch always
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rle_done:
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lda #$15 ; move the cursor somewhere sane
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sta CV
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rts
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load_and_increment:
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lda (GBASL),y ; load value ; 5?
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inc GBASL ; 5?
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bne lskip2 ; 2nt/3
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inc GBASH ; 5?
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lskip2:
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rts ; 6
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;==========================================================
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; set_text_page0
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;==========================================================
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|
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@ -192,8 +16,6 @@ set_text_page0:
|
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;==========================================================
|
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;
|
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set_gr_page0:
|
||||
;lda #4
|
||||
;sta GR_PAGE
|
||||
bit PAGE0 ; set page 0
|
||||
bit LORES ; Lo-res graphics
|
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bit TEXTGR ; mixed gr/text mode
|
||||
|
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@ -594,183 +416,3 @@ vlin_too_slow:
|
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rts ; return
|
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|
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|
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;================================
|
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; hlin_setup
|
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;================================
|
||||
; put address in GBASL/GBASH
|
||||
; Ycoord in A, Xcoord in Y
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hlin_setup:
|
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sty TEMPY ; 3
|
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tay ; y=A ; 2
|
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lda gr_offsets,Y ; lookup low-res memory address ; 4
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clc ; 2
|
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adc TEMPY ; 3
|
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sta GBASL ; 3
|
||||
iny ; 2
|
||||
|
||||
lda gr_offsets,Y ; 4
|
||||
adc DRAW_PAGE ; add in draw page offset ; 3
|
||||
sta GBASH ; 3
|
||||
rts ; 6
|
||||
;===========
|
||||
; 35
|
||||
;================================
|
||||
; hlin_double:
|
||||
;================================
|
||||
; HLIN Y, V2 AT A
|
||||
; Y, X, A trashed
|
||||
; start at Y, draw up to and including X
|
||||
hlin_double:
|
||||
;int hlin_double(int page, int x1, int x2, int at) {
|
||||
|
||||
jsr hlin_setup ; 41
|
||||
|
||||
sec ; 2
|
||||
lda V2 ; 3
|
||||
sbc TEMPY ; 3
|
||||
|
||||
tax ; 2
|
||||
inx ; 2
|
||||
;===========
|
||||
; 53
|
||||
; fallthrough
|
||||
|
||||
;=================================
|
||||
; hlin_double_continue: width
|
||||
;=================================
|
||||
; width in X
|
||||
|
||||
hlin_double_continue:
|
||||
|
||||
ldy #0 ; 2
|
||||
lda COLOR ; 3
|
||||
hlin_double_loop:
|
||||
sta (GBASL),Y ; 6
|
||||
inc GBASL ; 5
|
||||
dex ; 2
|
||||
bne hlin_double_loop ; 2nt/3
|
||||
|
||||
rts ; 6
|
||||
;=============
|
||||
; 53+5+X*16+5
|
||||
|
||||
;================================
|
||||
; hlin_single:
|
||||
;================================
|
||||
; HLIN Y, V2 AT A
|
||||
; Y, X, A trashed
|
||||
hlin_single:
|
||||
|
||||
jsr hlin_setup
|
||||
|
||||
sec
|
||||
lda V2
|
||||
sbc TEMPY
|
||||
|
||||
tax
|
||||
|
||||
; fallthrough
|
||||
|
||||
;=================================
|
||||
; hlin_single_continue: width
|
||||
;=================================
|
||||
; width in X
|
||||
|
||||
hlin_single_continue:
|
||||
|
||||
hlin_single_top:
|
||||
lda COLOR
|
||||
and #$f0
|
||||
sta COLOR
|
||||
|
||||
hlin_single_top_loop:
|
||||
ldy #0
|
||||
lda (GBASL),Y
|
||||
and #$0f
|
||||
ora COLOR
|
||||
sta (GBASL),Y
|
||||
inc GBASL
|
||||
dex
|
||||
bne hlin_single_top_loop
|
||||
|
||||
rts
|
||||
|
||||
hlin_single_bottom:
|
||||
|
||||
lda COLOR
|
||||
and #$0f
|
||||
sta COLOR
|
||||
|
||||
hlin_single_bottom_loop:
|
||||
ldy #0
|
||||
lda (GBASL),Y
|
||||
and #$f0
|
||||
sta (GBASL),Y
|
||||
inc GBASL
|
||||
dex
|
||||
bne hlin_single_bottom_loop
|
||||
|
||||
rts
|
||||
|
||||
|
||||
;=============================
|
||||
; clear_top
|
||||
;=============================
|
||||
clear_top:
|
||||
lda #$00
|
||||
|
||||
;=============================
|
||||
; clear_top_a
|
||||
;=============================
|
||||
clear_top_a:
|
||||
|
||||
sta COLOR
|
||||
|
||||
; VLIN Y, V2 AT A
|
||||
|
||||
lda #40
|
||||
sta V2
|
||||
|
||||
lda #0
|
||||
|
||||
clear_top_loop:
|
||||
ldy #0
|
||||
pha
|
||||
|
||||
jsr hlin_double
|
||||
|
||||
pla
|
||||
clc
|
||||
adc #$2
|
||||
cmp #40
|
||||
bne clear_top_loop
|
||||
|
||||
rts
|
||||
|
||||
clear_bottom:
|
||||
lda #$a0 ; NORMAL space
|
||||
sta COLOR
|
||||
|
||||
lda #40
|
||||
sta V2
|
||||
|
||||
clear_bottom_loop:
|
||||
ldy #0
|
||||
pha
|
||||
|
||||
jsr hlin_double
|
||||
|
||||
pla
|
||||
clc
|
||||
adc #$2
|
||||
cmp #48
|
||||
bne clear_bottom_loop
|
||||
|
||||
rts
|
||||
|
||||
; move these to zero page for slight speed increase?
|
||||
gr_offsets:
|
||||
.word $400,$480,$500,$580,$600,$680,$700,$780
|
||||
.word $428,$4a8,$528,$5a8,$628,$6a8,$728,$7a8
|
||||
.word $450,$4d0,$550,$5d0,$650,$6d0,$750,$7d0
|
||||
|
||||
|
|
@ -19,7 +19,10 @@ mode7_demo.dsk: $(DOS33) MODE7_DEMO
|
|||
MODE7_DEMO: mode7_demo.o
|
||||
ld65 -o MODE7_DEMO mode7_demo.o -C ./apple2_1000.inc
|
||||
|
||||
mode7_demo.o: mode7_demo.s mode7_demo_backgrounds.inc utils.s
|
||||
mode7_demo.o: mode7_demo.s mode7_demo_backgrounds.inc \
|
||||
../asm_routines/unrle_gr.s \
|
||||
../asm_routines/hlin_clearscreen.s \
|
||||
../asm_routines/gr_setpage.s
|
||||
ca65 -o mode7_demo.o mode7_demo.s -l mode7_demo.lst
|
||||
|
||||
|
||||
|
|
|
|||
|
|
@ -27,6 +27,8 @@ loop_forever:
|
|||
; External modules
|
||||
;===============================================
|
||||
|
||||
.include "utils.s"
|
||||
.include "../asm_routines/unrle_gr.s"
|
||||
.include "../asm_routines/hlin_clearscreen.s"
|
||||
.include "../asm_routines/gr_setpage.s"
|
||||
|
||||
.include "mode7_demo_backgrounds.inc"
|
||||
|
|
|
|||
Loading…
Reference in New Issue