github/AmigaExamples
1
0
Fork 0
mirror of https://frontier.innolan.net/github/AmigaExamples.git synced 2026-09-12 05:11:58 +00:00
Code Releases Activity

Some small optimisations

Browse Source
This commit is contained in:
alpine9000
2016-03-27 13:09:57 +11:00
parent cd9f89098f
commit 78b904dba3
4 changed files with 56 additions and 53 deletions
Download Patch File Download Diff File Expand all files Collapse all files
024.simple_text/blittext.s
+43 -46
View File
@@ -12,32 +12,35 @@ DrawText8:
;; a1 - text
;; d0 - xpos
;; d1 - ypos
movem.l d0/d2/a1,-(sp)
movem.l d0-d5/a0-a2,-(sp)
jsr WaitBlitter
;; blitter config that is shared for every character
move.w #SCREEN_WIDTH_BYTES-BLIT_WIDTH_BYTES,BLTAMOD(a6) ;A modulo
move.w #SCREEN_WIDTH_BYTES-BLIT_WIDTH_BYTES,BLTBMOD(a6) ;B modulo
move.w #SCREEN_WIDTH_BYTES-BLIT_WIDTH_BYTES,BLTCMOD(a6) ;C modulo
move.w #SCREEN_WIDTH_BYTES-BLIT_WIDTH_BYTES,BLTDMOD(a6) ;D modulo
move.w #SCREEN_WIDTH_BYTES-BLIT_WIDTH_BYTES,BLTAMOD(a6) ; A modulo
move.w #SCREEN_WIDTH_BYTES-BLIT_WIDTH_BYTES,BLTBMOD(a6) ; B modulo
move.w #SCREEN_WIDTH_BYTES-BLIT_WIDTH_BYTES,BLTCMOD(a6) ; C modulo
move.w #SCREEN_WIDTH_BYTES-BLIT_WIDTH_BYTES,BLTDMOD(a6) ; D modulo
mulu.w #SCREEN_WIDTH_BYTES*SCREEN_BIT_DEPTH,d1 ; ypos bytes
move.l a1,a5
.loop:
move.b (a1)+,d2 ; get next character
clr.l d2
move.b (a5)+,d2 ; get next character
cmp.b #0,d2 ; 0 terminates the string
beq .done
jsr DrawChar8 ; draw it
bsr DrawChar8 ; draw it
add.w #FONT_WIDTH,d0 ; increment the x position
bra .loop
.done:
movem.l (sp)+,d0/d2/a1
movem.l (sp)+,d0-d5/a0-a2
rts
DrawChar8:
;; kills d2,d3,d4,d5,a1,a2
;; d0 - xpos
;; d1 - ypos
;; d1 - ypos bytes
;; d2 - char
;; a0 - bitplane
movem.l d0-d5/a0-a2,-(sp)
move.w #'!',d4 ; fontmap offset
sub.w d4,d2 ; index = char - '!'
movem.l a0,-(sp)
sub.w #'!',d2 ; index = char - '!'
move.w d2,d5
lsr.w #5,d5 ; fontmap y offset
@@ -46,7 +49,7 @@ DrawChar8:
sub.w d4,d2 ;
add.w #1,d5 ; while we have a weird font image, '!' starts on second line
lea font,a1
lea font(pc),a1
lea fontMask,a2
mulu.w #SCREEN_WIDTH_BYTES*SCREEN_BIT_DEPTH*FONT_HEIGHT,d5
add.w d5,a2
@@ -55,41 +58,37 @@ DrawChar8:
btst #0,d2 ; blitter does words only, so we need to know if its an odd or even character
beq .even ; then shift it into position with the blitter shift
.odd:
move.b #1,d3
moveq #1,d3
bra .c1
.even:
move.b #0,d3
moveq #0,d3
.c1
add.w d2,a1
add.w d2,a2
jsr BlitChar8
movem.l (sp)+,d0-d5/a0-a2
bsr BlitChar8
movem.l (sp)+,a0
rts
BlitChar8:
;; kills a0,d0,d3
;; kills a0,d2,d4
;; d0 - xpos
;; d1 - ypos
;; d1 - ypos bytes
;; d3 - odd character = 1, even character = 0
;; a0 - display
;; a1 - object
;; a2 - mask
move.l d0,d4 ; d4 = XPOS
move.l d0,d2
lsr.w #3,d4 ; d4 = XPOS_BYTES
jsr WaitBlitter
;; d0 = XPOS
;; d1 = YPOS
;; d3 = odd character
;; d4 = XPOS_BYTES
move.l d0,d4 ; d4 = XPOS
lsr.w #3,d4 ; d4 = XPOS_BYTES
cmp.b #1,d3
bne .evenChar
btst #0,d3
beq .evenChar
.oddChar
sub.w #8,d0
sub.w #8,d2
move.w #$00FF,BLTAFWM(a6) ; no mask for first word
move.w #$0000,BLTALWM(a6) ; mask out last word
subq #1,a0
@@ -99,26 +98,24 @@ BlitChar8:
move.w #$0000,BLTALWM(a6) ; mask out last word
.continue:
;; this shift will give us the bits to shift (bits 0-3) in bits (12-15) of d0
lsl.w #8,d0 ; BLIT_SOURCE_SHIFT<<BLIT_ASHIFTSHIFT
lsl.w #4,d0 ; BLIT_SOURCE_SHIFT<<BLIT_ASHIFTSHIFT
;; this shift will give us the bits to shift (bits 0-3) in bits (12-15) of d2
move.w d0,BLTCON1(A6)
ori.w #BLIT_SRCA|BLIT_SRCB|BLIT_SRCC|BLIT_DEST|BLIT_LF_MINTERM,d0
move.w d0,BLTCON0(A6)
lsl.w #8,d2 ; BLIT_SOURCE_SHIFT<<BLIT_ASHIFTSHIFT
lsl.w #4,d2 ; BLIT_SOURCE_SHIFT<<BLIT_ASHIFTSHIFT
move.w d2,BLTCON1(A6)
ori.w #BLIT_SRCA|BLIT_SRCB|BLIT_SRCC|BLIT_DEST|BLIT_LF_MINTERM,d2
move.w d2,BLTCON0(A6)
move.l a2,BLTAPTH(a6) ; mask bitplane
move.l a1,BLTBPTH(a6) ; bob bitplane
move.w #SCREEN_WIDTH_BYTES*SCREEN_BIT_DEPTH,d3 ; d3 = SCREEN_WIDTH_BYTES*SCREEN_BIT_DEPTH
move.l a0,d2 ; d2 = #bitplanes
add.l d4,d2 ; d2 = #bitplanes+XPOS_BYTES
add.l d1,d2 ; d2 = #bitplanes+XPOS_BYTES+(YPOS*SCREEN_WIDTH_BYTES*SCREEN_BIT_DEPTH)
mulu.w d1,d3 ; d3 = YPOS*SCREEN_WIDTH_BYTES*SCREEN_BIT_DEPTH
move.l a0,d0 ; d0 = #bitplanes
add.l d4,d0 ; d0 = #bitplanes+XPOS_BYTES
add.l d3,d0 ; d0 = #bitplanes+XPOS_BYTES+(YPOS*SCREEN_WIDTH_BYTES*SCREEN_BIT_DEPTH)
move.l d0,BLTCPTH(a6) ;background top left corner
move.l d0,BLTDPTH(a6) ;destination top left corner
move.l d2,BLTCPTH(a6) ;background top left corner
move.l d2,BLTDPTH(a6) ;destination top left corner
move.w #(FONT_HEIGHT*SCREEN_BIT_DEPTH)<<6|(BLIT_WIDTH_WORDS),BLTSIZE(a6) ;rectangle size, starts blit
rts