tfv: more splitting up of utils
This commit is contained in:
Vince Weaver
parent
b2cfa68e14
commit
56eb315cc9
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@ -1,552 +0,0 @@
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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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; 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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; set_gr_page0
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;==========================================================
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;
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set_gr_page0:
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;lda #4
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;sta GR_PAGE
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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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;==========================================================
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; Wait until keypressed
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;==========================================================
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;
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wait_until_keypressed:
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lda KEYPRESS ; check if keypressed
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bpl wait_until_keypressed ; if not, loop
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jmp figure_out_key
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;==========================================================
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; Get Key
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;==========================================================
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;
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get_key:
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check_paddle_button:
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; check for paddle button
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bit PADDLE_BUTTON0 ; 4
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bpl no_button ; 2nt/3
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lda #' '+128 ; 2
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jmp save_key ; 3
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no_button:
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lda KEYPRESS ; 3
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bpl no_key ; 2nt/3
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figure_out_key:
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cmp #' '+128 ; the mask destroys space ; 2
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beq save_key ; so handle it specially ; 2nt/3
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and #$5f ; mask, to make upper-case ; 2
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check_right_arrow:
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cmp #$15 ; 2
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bne check_left_arrow ; 2nt/3
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lda #'D' ; 2
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check_left_arrow:
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cmp #$08 ; 2
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bne check_up_arrow ; 2nt/3
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lda #'A' ; 2
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check_up_arrow:
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cmp #$0B ; 2
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bne check_down_arrow ; 2nt/3
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lda #'W' ; 2
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check_down_arrow:
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cmp #$0A ; 2
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bne check_escape ; 2nt/3
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lda #'S' ; 2
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check_escape:
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cmp #$1B ; 2
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bne save_key ; 2nt/3
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lda #'Q' ; 2
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jmp save_key ; 3
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no_key:
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bit PADDLE_STATUS ; 3
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bpl no_key_store ; 2nt/3
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; check for paddle action
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; code from http://web.pdx.edu/~heiss/technotes/aiie/tn.aiie.06.html
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inc PADDLE_STATUS ; 5
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lda PADDLE_STATUS ; 3
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and #$03 ; 2
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beq check_paddles ; 2nt/3
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jmp no_key_store ; 3
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check_paddles:
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lda PADDLE_STATUS ; 3
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and #$80 ; 2
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sta PADDLE_STATUS ; 3
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ldx #$0 ; 2
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LDA PTRIG ;TRIGGER PADDLES ; 4
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LDY #0 ;INIT COUNTER ; 2
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NOP ;COMPENSATE FOR 1ST COUNT ; 2
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NOP ; 2
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PREAD2: LDA PADDL0,X ;COUNT EVERY 11 uSEC. ; 4
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BPL RTS2D ;BRANCH WHEN TIMED OUT ; 2nt/3
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INY ;INCREMENT COUNTER ; 2
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BNE PREAD2 ;CONTINUE COUNTING ; 2nt/3
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DEY ;COUNTER OVERFLOWED ; 2
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RTS2D: ;RETURN W/VALUE 0-255
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cpy #96 ; 2
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bmi paddle_left ; 2nt/3
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cpy #160 ; 2
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bmi no_key_store ; 2nt/3
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lda #'D' ; 2
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jmp save_key ; 3
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paddle_left:
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lda #'A' ; 2
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jmp save_key ; 3
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no_key_store:
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lda #0 ; no key, so save a zero ; 2
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save_key:
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sta LASTKEY ; save the key to our buffer ; 2
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bit KEYRESET ; clear the keyboard buffer ; 4
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rts ; 6
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;============
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; 33=nokey
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; 48=worstkey
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;=============================================
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; put_sprite
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;=============================================
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; Sprite to display in INH,INL
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; Location is XPOS,YPOS
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; Note, only works if YPOS is multiple of two?
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put_sprite:
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ldy #0 ; byte 0 is xsize ; 2
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lda (INL),Y ; 5
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sta CH ; xsize is in CH ; 3
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iny ; 2
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lda (INL),Y ; byte 1 is ysize ; 5
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sta CV ; ysize is in CV ; 3
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iny ; 2
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lda YPOS ; make a copy of ypos ; 3
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sta TEMPY ; as we modify it ; 3
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;===========
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; 28
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put_sprite_loop:
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sty TEMP ; save sprite pointer ; 3
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ldy TEMPY ; 3
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lda gr_offsets,Y ; lookup low-res memory address ; 5
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clc ; 2
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adc XPOS ; add in xpos ; 3
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sta OUTL ; store out low byte of addy ; 3
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lda gr_offsets+1,Y ; look up high byte ; 5
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adc DRAW_PAGE ; ; 3
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sta OUTH ; and store it out ; 3
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ldy TEMP ; restore sprite pointer ; 3
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; OUTH:OUTL now points at right place
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ldx CH ; load xsize into x ; 3
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;===========
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; 36
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put_sprite_pixel:
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lda (INL),Y ; get sprite colors ; 5
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iny ; increment sprite pointer ; 2
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sty TEMP ; save sprite pointer ; 3
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ldy #$0 ; 2
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; check if completely transparent
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; if so, skip
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cmp #$0 ; if all zero, transparent ; 2
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beq put_sprite_done_draw ; don't draw it ; 2nt/3
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; FIXME: use BIT? ;==============
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; 17
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sta COLOR ; save color for later ; 3
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; check if top pixel transparent
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and #$f0 ; check if top nibble zero ; 2
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bne put_sprite_bottom ; if not skip ahead ; 2nt/3
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lda #$f0 ; setup mask ; 2
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sta MASK ; 3
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bmi put_sprite_mask ; 2nt/3
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put_sprite_bottom:
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lda COLOR ; re-load color ; 3
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and #$0f ; check if bottom nibble zero ; 2
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bne put_sprite_all ; if not, skip ahead ; 2nt/3
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lda #$0f ; 2
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sta MASK ; setup mask ; 3
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put_sprite_mask:
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lda (OUTL),Y ; get color at output ; 5
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and MASK ; mask off unneeded part ; 3
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ora COLOR ; or the color in ; 3
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sta (OUTL),Y ; store it back ; 5
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jmp put_sprite_done_draw ; we are done ; 3
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put_sprite_all:
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lda COLOR ; load color ; 3
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sta (OUTL),Y ; and write it out ; 5
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put_sprite_done_draw:
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ldy TEMP ; restore sprite pointer ; 3
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inc OUTL ; increment output pointer ; 5
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dex ; decrement x counter ; 2
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bne put_sprite_pixel ; if not done, keep looping ; 2nt/3
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inc TEMPY ; each line has two y vars ; 5
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inc TEMPY ; 5
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dec CV ; decemenet total y count ; 5
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bne put_sprite_loop ; loop if not done ; 2nt/3
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rts ; return ; 6
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;================================
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; htab_vtab
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;================================
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; move to CH/CV
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htab_vtab:
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lda CV
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asl
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tay
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lda gr_offsets,Y ; lookup low-res memory address
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clc
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adc CH ; add in xpos
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sta BASL ; store out low byte of addy
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lda gr_offsets+1,Y ; look up high byte
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adc DRAW_PAGE ;
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sta BASH ; and store it out
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; BASH:BASL now points at right place
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rts
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;================================
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; move_and_print
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;================================
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; move to CH/CV
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move_and_print:
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jsr htab_vtab
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;================================
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; print_string
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;================================
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print_string:
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ldy #0
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print_string_loop:
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lda (OUTL),Y
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beq done_print_string
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ora #$80
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sta (BASL),Y
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iny
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bne print_string_loop
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done_print_string:
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rts
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;====================
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; point_to_end_string
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;====================
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point_to_end_string:
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iny
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tya
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clc
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adc OUTL
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sta OUTL
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lda #0
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adc OUTH
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sta OUTH
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rts
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;================================
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; print_both_pages
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;================================
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print_both_pages:
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lda DRAW_PAGE
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pha
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lda #0
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sta DRAW_PAGE
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jsr move_and_print
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lda #4
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sta DRAW_PAGE
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jsr move_and_print
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pla
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sta DRAW_PAGE
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rts ; oops forgot this initially
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; explains the weird vertical stripes on the screen
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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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14
tfv/Makefile
14
tfv/Makefile
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@ -56,8 +56,18 @@ TFV: tfv.o
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tfv.o: tfv.s \
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tfv_flying.s tfv_info.s tfv_multiply.s tfv_opener.s tfv_title.s \
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tfv_textentry.s tfv_utils.s tfv_worldmap.s \
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tfv_backgrounds.inc tfv_sprites.inc tfv_zp.inc
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tfv_textentry.s tfv_worldmap.s \
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tfv_backgrounds.inc tfv_sprites.inc tfv_zp.inc \
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../asm_routines/hlin_clearscreen.s \
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../asm_routines/pageflip.s \
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../asm_routines/gr_setpage.s \
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../asm_routines/keypress.s \
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../asm_routines/gr_putsprite.s \
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../asm_routines/text_print.s \
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../asm_routines/memset.s \
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../asm_routines/gr_vlin.s \
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../asm_routines/gr_copy.s \
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../asm_routines/gr_unrle.s
|
||||
ca65 -o tfv.o tfv.s -l tfv.lst
|
||||
|
||||
|
||||
|
|
|
|||
12
tfv/tfv.s
12
tfv/tfv.s
|
|
@ -84,13 +84,23 @@ exit:
|
|||
;===============================================
|
||||
|
||||
.include "tfv_opener.s"
|
||||
.include "tfv_utils.s"
|
||||
.include "tfv_title.s"
|
||||
.include "tfv_textentry.s"
|
||||
.include "tfv_flying.s"
|
||||
.include "tfv_worldmap.s"
|
||||
.include "tfv_info.s"
|
||||
|
||||
.include "../asm_routines/hlin_clearscreen.s"
|
||||
.include "../asm_routines/pageflip.s"
|
||||
.include "../asm_routines/gr_setpage.s"
|
||||
.include "../asm_routines/keypress.s"
|
||||
.include "../asm_routines/gr_putsprite.s"
|
||||
.include "../asm_routines/text_print.s"
|
||||
.include "../asm_routines/memset.s"
|
||||
.include "../asm_routines/gr_vlin.s"
|
||||
.include "../asm_routines/gr_copy.s"
|
||||
.include "../asm_routines/gr_unrle.s"
|
||||
|
||||
;===============================================
|
||||
; Variables
|
||||
;===============================================
|
||||
|
|
|
|||
776
tfv/tfv_utils.s
776
tfv/tfv_utils.s
|
|
@ -1,776 +0,0 @@
|
|||
;=====================================================================
|
||||
;= ROUTINES
|
||||
;=====================================================================
|
||||
|
||||
|
||||
clear_screens:
|
||||
;===================================
|
||||
; Clear top/bottom of page 0
|
||||
;===================================
|
||||
|
||||
lda #$0
|
||||
sta DRAW_PAGE
|
||||
jsr clear_top
|
||||
jsr clear_bottom
|
||||
|
||||
;===================================
|
||||
; Clear top/bottom of page 1
|
||||
;===================================
|
||||
|
||||
lda #$4
|
||||
sta DRAW_PAGE
|
||||
jsr clear_top
|
||||
jsr clear_bottom
|
||||
|
||||
rts
|
||||
|
||||
;==========
|
||||
; page_flip
|
||||
;==========
|
||||
|
||||
page_flip:
|
||||
lda DISP_PAGE ; 3
|
||||
beq page_flip_show_1 ; 2nt/3
|
||||
page_flip_show_0:
|
||||
bit PAGE0 ; 4
|
||||
lda #4 ; 2
|
||||
sta DRAW_PAGE ; DRAW_PAGE=1 ; 3
|
||||
lda #0 ; 2
|
||||
sta DISP_PAGE ; DISP_PAGE=0 ; 3
|
||||
rts ; 6
|
||||
page_flip_show_1:
|
||||
bit PAGE1 ; 4
|
||||
sta DRAW_PAGE ; DRAW_PAGE=0 ; 3
|
||||
lda #1 ; 2
|
||||
sta DISP_PAGE ; DISP_PAGE=1 ; 3
|
||||
rts ; 6
|
||||
;====================
|
||||
; DISP_PAGE=0 26
|
||||
; DISP_PAGE=1 24
|
||||
|
||||
;======================
|
||||
; memset
|
||||
;======================
|
||||
; a=value
|
||||
; x=length
|
||||
; MEMPTRL/MEMPTRH is address
|
||||
memset:
|
||||
ldy #0
|
||||
memset_loop:
|
||||
sta MEMPTRL,Y
|
||||
iny
|
||||
dex
|
||||
bne memset_loop
|
||||
rts
|
||||
|
||||
|
||||
;=================
|
||||
; load RLE image
|
||||
;=================
|
||||
; Output is BASH/BASL
|
||||
; Input is in GBASH/GBASL
|
||||
load_rle_gr:
|
||||
lda #$0
|
||||
tay ; init Y to 0
|
||||
sta TEMP ; stores the xcoord
|
||||
|
||||
sta CV ; ycoord=0
|
||||
|
||||
jsr load_and_increment ; load xsize
|
||||
sta CH
|
||||
|
||||
rle_loop:
|
||||
jsr load_and_increment
|
||||
|
||||
cmp #$A1 ; if 0xa1
|
||||
beq rle_done ; we are done
|
||||
|
||||
pha
|
||||
|
||||
and #$f0 ; mask
|
||||
cmp #$a0 ; see if special AX
|
||||
beq decompress_special
|
||||
|
||||
pla ; note, PLA sets flags!
|
||||
|
||||
ldx #$1 ; only want to print 1
|
||||
bne decompress_run
|
||||
|
||||
decompress_special:
|
||||
pla
|
||||
|
||||
and #$0f ; check if was A0
|
||||
|
||||
bne decompress_color ; if A0 need to read run, color
|
||||
|
||||
decompress_large:
|
||||
jsr load_and_increment ; get run length
|
||||
|
||||
decompress_color:
|
||||
tax ; put runlen into X
|
||||
jsr load_and_increment ; get color
|
||||
|
||||
decompress_run:
|
||||
rle_run_loop:
|
||||
sta (BASL),y ; write out the value
|
||||
inc BASL ; increment the pointer
|
||||
bne rle_skip3 ; if wrapped
|
||||
inc BASH ; then increment the high value
|
||||
|
||||
rle_skip3:
|
||||
pha ; store colore for later
|
||||
|
||||
inc TEMP ; increment the X value
|
||||
lda TEMP
|
||||
cmp CH ; compare against the image width
|
||||
bcc rle_not_eol ; if less then keep going
|
||||
|
||||
lda BASL ; cheat to avoid a 16-bit add
|
||||
cmp #$a7 ; we are adding 0x58 to get
|
||||
bcc rle_add_skip ; to the next line
|
||||
inc BASH
|
||||
rle_add_skip:
|
||||
clc
|
||||
adc #$58 ; actually do the 0x58 add
|
||||
sta BASL ; and store it back
|
||||
|
||||
inc CV ; add 2 to ypos
|
||||
inc CV ; each "line" is two high
|
||||
|
||||
lda CV ; load value
|
||||
cmp #15 ; if it's greater than 14 it wraps
|
||||
bcc rle_no_wrap ; Thanks Woz
|
||||
|
||||
lda #$0 ; we wrapped, so set to zero
|
||||
sta CV
|
||||
|
||||
; when wrapping have to sub 0x3d8
|
||||
sec ; this is a 16-bit subtract routine
|
||||
lda BASL
|
||||
sbc #$d8 ; LSB
|
||||
sta BASL
|
||||
lda BASH ; MSB
|
||||
sbc #$3 ;
|
||||
sta BASH
|
||||
|
||||
rle_no_wrap:
|
||||
lda #$0 ; set X value back to zero
|
||||
sta TEMP
|
||||
|
||||
rle_not_eol:
|
||||
pla ; restore color
|
||||
dex
|
||||
bne rle_run_loop ; if not zero, keep looping
|
||||
beq rle_loop ; and branch always
|
||||
|
||||
rle_done:
|
||||
lda #$15 ; move the cursor somewhere sane
|
||||
sta CV
|
||||
rts
|
||||
|
||||
|
||||
load_and_increment:
|
||||
lda (GBASL),y ; load value ; 5?
|
||||
inc GBASL ; 5?
|
||||
bne lskip2 ; 2nt/3
|
||||
inc GBASH ; 5?
|
||||
lskip2:
|
||||
rts ; 6
|
||||
|
||||
|
||||
;==========================================================
|
||||
; set_text_page0
|
||||
;==========================================================
|
||||
;
|
||||
set_text_page0:
|
||||
bit PAGE0 ; set page0
|
||||
bit TEXT ; set text mode
|
||||
rts
|
||||
|
||||
;==========================================================
|
||||
; set_gr_page0
|
||||
;==========================================================
|
||||
;
|
||||
set_gr_page0:
|
||||
;lda #4
|
||||
;sta GR_PAGE
|
||||
bit PAGE0 ; set page 0
|
||||
bit LORES ; Lo-res graphics
|
||||
bit TEXTGR ; mixed gr/text mode
|
||||
bit SET_GR ; set graphics
|
||||
rts
|
||||
|
||||
;=========================================================
|
||||
; gr_copy_to_current
|
||||
;=========================================================
|
||||
; copy 0xc00 to DRAW_PAGE
|
||||
; 2 + 8*38 + 4*80*23 + 4*120*26 + 13 = 20,159 = 20ms = 50Hz
|
||||
;
|
||||
gr_copy_to_current:
|
||||
ldx #0 ; set y to zero ; 2
|
||||
|
||||
gr_copy_loop:
|
||||
stx TEMP ; save y ; 3
|
||||
txa ; move to A ; 2
|
||||
asl ; mult by 2 ; 2
|
||||
tay ; put into Y ; 2
|
||||
lda gr_offsets,Y ; lookup low byte for line addr ; 5
|
||||
sta OUTL ; out and in are the same ; 3
|
||||
sta INL ; 3
|
||||
lda gr_offsets+1,Y ; lookup high byte for line addr ; 5
|
||||
adc DRAW_PAGE
|
||||
sta OUTH ; 3
|
||||
lda gr_offsets+1,Y ; lookup high byte for line addr ; 5
|
||||
adc #$8 ; for now, fixed 0xc ; 2
|
||||
sta INH ; 3
|
||||
ldx TEMP ; restore y ; 3
|
||||
|
||||
ldy #0 ; set X counter to 0 ; 2
|
||||
gr_copy_line:
|
||||
lda (INL),Y ; load a byte ; 5
|
||||
sta (OUTL),Y ; store a byte ; 6
|
||||
iny ; increment pointer ; 2
|
||||
|
||||
cpx #$4 ; don't want to copy bottom 4*40 ; 2
|
||||
bcs gr_copy_above4 ; 3
|
||||
|
||||
gr_copy_below4:
|
||||
cpy #120 ; for early ones, copy 120 bytes ; 2
|
||||
bne gr_copy_line ; 3
|
||||
beq gr_copy_line_done ; 3
|
||||
|
||||
gr_copy_above4: ; for last four, just copy 80 bytes
|
||||
cpy #80 ; 2
|
||||
bne gr_copy_line ; 3
|
||||
|
||||
gr_copy_line_done:
|
||||
inx ; increment y value ; 2
|
||||
cpx #8 ; there are 8 of them ; 2
|
||||
bne gr_copy_loop ; if not, loop ; 3
|
||||
rts ; 6
|
||||
|
||||
;==========================================================
|
||||
; Wait until keypressed
|
||||
;==========================================================
|
||||
;
|
||||
|
||||
wait_until_keypressed:
|
||||
lda KEYPRESS ; check if keypressed
|
||||
bpl wait_until_keypressed ; if not, loop
|
||||
jmp figure_out_key
|
||||
|
||||
|
||||
;==========================================================
|
||||
; Get Key
|
||||
;==========================================================
|
||||
;
|
||||
|
||||
get_key:
|
||||
|
||||
check_paddle_button:
|
||||
|
||||
; check for paddle button
|
||||
|
||||
bit PADDLE_BUTTON0 ; 4
|
||||
bpl no_button ; 2nt/3
|
||||
lda #' '+128 ; 2
|
||||
jmp save_key ; 3
|
||||
|
||||
no_button:
|
||||
lda KEYPRESS ; 3
|
||||
bpl no_key ; 2nt/3
|
||||
|
||||
figure_out_key:
|
||||
cmp #' '+128 ; the mask destroys space ; 2
|
||||
beq save_key ; so handle it specially ; 2nt/3
|
||||
|
||||
and #$5f ; mask, to make upper-case ; 2
|
||||
check_right_arrow:
|
||||
cmp #$15 ; 2
|
||||
bne check_left_arrow ; 2nt/3
|
||||
lda #'D' ; 2
|
||||
check_left_arrow:
|
||||
cmp #$08 ; 2
|
||||
bne check_up_arrow ; 2nt/3
|
||||
lda #'A' ; 2
|
||||
check_up_arrow:
|
||||
cmp #$0B ; 2
|
||||
bne check_down_arrow ; 2nt/3
|
||||
lda #'W' ; 2
|
||||
check_down_arrow:
|
||||
cmp #$0A ; 2
|
||||
bne check_escape ; 2nt/3
|
||||
lda #'S' ; 2
|
||||
check_escape:
|
||||
cmp #$1B ; 2
|
||||
bne save_key ; 2nt/3
|
||||
lda #'Q' ; 2
|
||||
jmp save_key ; 3
|
||||
|
||||
no_key:
|
||||
bit PADDLE_STATUS ; 3
|
||||
bpl no_key_store ; 2nt/3
|
||||
|
||||
; check for paddle action
|
||||
; code from http://web.pdx.edu/~heiss/technotes/aiie/tn.aiie.06.html
|
||||
|
||||
inc PADDLE_STATUS ; 5
|
||||
lda PADDLE_STATUS ; 3
|
||||
and #$03 ; 2
|
||||
beq check_paddles ; 2nt/3
|
||||
jmp no_key_store ; 3
|
||||
|
||||
check_paddles:
|
||||
lda PADDLE_STATUS ; 3
|
||||
and #$80 ; 2
|
||||
sta PADDLE_STATUS ; 3
|
||||
|
||||
ldx #$0 ; 2
|
||||
LDA PTRIG ;TRIGGER PADDLES ; 4
|
||||
LDY #0 ;INIT COUNTER ; 2
|
||||
NOP ;COMPENSATE FOR 1ST COUNT ; 2
|
||||
NOP ; 2
|
||||
PREAD2: LDA PADDL0,X ;COUNT EVERY 11 uSEC. ; 4
|
||||
BPL RTS2D ;BRANCH WHEN TIMED OUT ; 2nt/3
|
||||
INY ;INCREMENT COUNTER ; 2
|
||||
BNE PREAD2 ;CONTINUE COUNTING ; 2nt/3
|
||||
DEY ;COUNTER OVERFLOWED ; 2
|
||||
RTS2D: ;RETURN W/VALUE 0-255
|
||||
|
||||
cpy #96 ; 2
|
||||
bmi paddle_left ; 2nt/3
|
||||
cpy #160 ; 2
|
||||
bmi no_key_store ; 2nt/3
|
||||
lda #'D' ; 2
|
||||
jmp save_key ; 3
|
||||
paddle_left:
|
||||
lda #'A' ; 2
|
||||
jmp save_key ; 3
|
||||
|
||||
no_key_store:
|
||||
lda #0 ; no key, so save a zero ; 2
|
||||
|
||||
save_key:
|
||||
sta LASTKEY ; save the key to our buffer ; 2
|
||||
bit KEYRESET ; clear the keyboard buffer ; 4
|
||||
rts ; 6
|
||||
;============
|
||||
; 33=nokey
|
||||
; 48=worstkey
|
||||
|
||||
|
||||
;=============================================
|
||||
; put_sprite
|
||||
;=============================================
|
||||
; Sprite to display in INH,INL
|
||||
; Location is XPOS,YPOS
|
||||
; Note, only works if YPOS is multiple of two?
|
||||
|
||||
put_sprite:
|
||||
|
||||
ldy #0 ; byte 0 is xsize ; 2
|
||||
lda (INL),Y ; 5
|
||||
sta CH ; xsize is in CH ; 3
|
||||
iny ; 2
|
||||
|
||||
lda (INL),Y ; byte 1 is ysize ; 5
|
||||
sta CV ; ysize is in CV ; 3
|
||||
iny ; 2
|
||||
|
||||
lda YPOS ; make a copy of ypos ; 3
|
||||
sta TEMPY ; as we modify it ; 3
|
||||
;===========
|
||||
; 28
|
||||
put_sprite_loop:
|
||||
sty TEMP ; save sprite pointer ; 3
|
||||
|
||||
ldy TEMPY ; 3
|
||||
lda gr_offsets,Y ; lookup low-res memory address ; 5
|
||||
clc ; 2
|
||||
adc XPOS ; add in xpos ; 3
|
||||
sta OUTL ; store out low byte of addy ; 3
|
||||
lda gr_offsets+1,Y ; look up high byte ; 5
|
||||
adc DRAW_PAGE ; ; 3
|
||||
sta OUTH ; and store it out ; 3
|
||||
ldy TEMP ; restore sprite pointer ; 3
|
||||
|
||||
; OUTH:OUTL now points at right place
|
||||
|
||||
ldx CH ; load xsize into x ; 3
|
||||
;===========
|
||||
; 36
|
||||
put_sprite_pixel:
|
||||
lda (INL),Y ; get sprite colors ; 5
|
||||
iny ; increment sprite pointer ; 2
|
||||
|
||||
sty TEMP ; save sprite pointer ; 3
|
||||
ldy #$0 ; 2
|
||||
|
||||
; check if completely transparent
|
||||
; if so, skip
|
||||
|
||||
cmp #$0 ; if all zero, transparent ; 2
|
||||
beq put_sprite_done_draw ; don't draw it ; 2nt/3
|
||||
; FIXME: use BIT? ;==============
|
||||
; 17
|
||||
|
||||
sta COLOR ; save color for later ; 3
|
||||
|
||||
; check if top pixel transparent
|
||||
|
||||
and #$f0 ; check if top nibble zero ; 2
|
||||
bne put_sprite_bottom ; if not skip ahead ; 2nt/3
|
||||
|
||||
lda #$f0 ; setup mask ; 2
|
||||
sta MASK ; 3
|
||||
bmi put_sprite_mask ; 2nt/3
|
||||
|
||||
put_sprite_bottom:
|
||||
lda COLOR ; re-load color ; 3
|
||||
and #$0f ; check if bottom nibble zero ; 2
|
||||
bne put_sprite_all ; if not, skip ahead ; 2nt/3
|
||||
lda #$0f ; 2
|
||||
sta MASK ; setup mask ; 3
|
||||
|
||||
put_sprite_mask:
|
||||
lda (OUTL),Y ; get color at output ; 5
|
||||
and MASK ; mask off unneeded part ; 3
|
||||
ora COLOR ; or the color in ; 3
|
||||
sta (OUTL),Y ; store it back ; 5
|
||||
|
||||
jmp put_sprite_done_draw ; we are done ; 3
|
||||
|
||||
put_sprite_all:
|
||||
lda COLOR ; load color ; 3
|
||||
sta (OUTL),Y ; and write it out ; 5
|
||||
|
||||
|
||||
put_sprite_done_draw:
|
||||
|
||||
ldy TEMP ; restore sprite pointer ; 3
|
||||
|
||||
inc OUTL ; increment output pointer ; 5
|
||||
dex ; decrement x counter ; 2
|
||||
bne put_sprite_pixel ; if not done, keep looping ; 2nt/3
|
||||
|
||||
inc TEMPY ; each line has two y vars ; 5
|
||||
inc TEMPY ; 5
|
||||
dec CV ; decemenet total y count ; 5
|
||||
bne put_sprite_loop ; loop if not done ; 2nt/3
|
||||
|
||||
rts ; return ; 6
|
||||
|
||||
|
||||
;================================
|
||||
; htab_vtab
|
||||
;================================
|
||||
; move to CH/CV
|
||||
htab_vtab:
|
||||
lda CV
|
||||
asl
|
||||
tay
|
||||
lda gr_offsets,Y ; lookup low-res memory address
|
||||
clc
|
||||
adc CH ; add in xpos
|
||||
sta BASL ; store out low byte of addy
|
||||
|
||||
lda gr_offsets+1,Y ; look up high byte
|
||||
adc DRAW_PAGE ;
|
||||
sta BASH ; and store it out
|
||||
; BASH:BASL now points at right place
|
||||
|
||||
rts
|
||||
|
||||
;================================
|
||||
; move_and_print
|
||||
;================================
|
||||
; move to CH/CV
|
||||
move_and_print:
|
||||
jsr htab_vtab
|
||||
|
||||
;================================
|
||||
; print_string
|
||||
;================================
|
||||
|
||||
print_string:
|
||||
ldy #0
|
||||
print_string_loop:
|
||||
lda (OUTL),Y
|
||||
beq done_print_string
|
||||
ora #$80
|
||||
sta (BASL),Y
|
||||
iny
|
||||
bne print_string_loop
|
||||
done_print_string:
|
||||
rts
|
||||
|
||||
;====================
|
||||
; point_to_end_string
|
||||
;====================
|
||||
point_to_end_string:
|
||||
iny
|
||||
tya
|
||||
clc
|
||||
adc OUTL
|
||||
sta OUTL
|
||||
lda #0
|
||||
adc OUTH
|
||||
sta OUTH
|
||||
|
||||
rts
|
||||
|
||||
|
||||
;================================
|
||||
; print_both_pages
|
||||
;================================
|
||||
print_both_pages:
|
||||
lda DRAW_PAGE
|
||||
pha
|
||||
|
||||
lda #0
|
||||
sta DRAW_PAGE
|
||||
jsr move_and_print
|
||||
|
||||
lda #4
|
||||
sta DRAW_PAGE
|
||||
jsr move_and_print
|
||||
|
||||
pla
|
||||
sta DRAW_PAGE
|
||||
|
||||
rts ; oops forgot this initially
|
||||
; explains the weird vertical stripes on the screen
|
||||
|
||||
;=========================================
|
||||
; vlin
|
||||
;=========================================
|
||||
; X, V2 at Y
|
||||
vlin:
|
||||
|
||||
sty TEMPY ; save Y (x location)
|
||||
vlin_loop:
|
||||
|
||||
txa ; a=x (get first y)
|
||||
and #$fe ; Clear bottom bit
|
||||
tay ;
|
||||
lda gr_offsets,Y ; lookup low-res memory address low
|
||||
sta GBASL ; put it into our indirect pointer
|
||||
iny
|
||||
lda gr_offsets,Y ; lookup low-res memory address high
|
||||
clc
|
||||
adc DRAW_PAGE ; add in draw page offset
|
||||
sta GBASH ; put into top of indirect
|
||||
|
||||
ldy TEMPY ; load back in y (x offset)
|
||||
|
||||
txa ; load back in x (current y)
|
||||
lsr ; check the low bit
|
||||
bcc vlin_low ; if not set, skip to low
|
||||
|
||||
vlin_high:
|
||||
lda #$F0 ; setup masks
|
||||
sta MASK
|
||||
lda #$0f
|
||||
bcs vlin_too_slow
|
||||
|
||||
vlin_low: ; setup masks
|
||||
lda #$0f
|
||||
sta MASK
|
||||
lda #$f0
|
||||
vlin_too_slow:
|
||||
|
||||
and (GBASL),Y ; mask current byte
|
||||
sta (GBASL),Y ; and store back
|
||||
|
||||
lda MASK ; mask the color
|
||||
and COLOR
|
||||
ora (GBASL),Y ; or into the right place
|
||||
sta (GBASL),Y ; store it
|
||||
|
||||
inx ; increment X (current y)
|
||||
cpx V2 ; compare to the limit
|
||||
bcc vlin_loop ; if <= then loop
|
||||
|
||||
rts ; return
|
||||
|
||||
|
||||
;================================
|
||||
; hlin_setup
|
||||
;================================
|
||||
; put address in GBASL/GBASH
|
||||
; Ycoord in A, Xcoord in Y
|
||||
hlin_setup:
|
||||
sty TEMPY ; 3
|
||||
tay ; y=A ; 2
|
||||
lda gr_offsets,Y ; lookup low-res memory address ; 4
|
||||
clc ; 2
|
||||
adc TEMPY ; 3
|
||||
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
|
||||
|
||||
Loading…
Reference in New Issue