6502/cc65
1
0
Fork 0
mirror of https://github.com/cc65/cc65.git synced 2024-09-29 02:55:20 +00:00
Code Issues Projects Releases Wiki Activity

Patches by Stefan Haubenthal

Browse Source 
git-svn-id: svn://svn.cc65.org/cc65/trunk@2687 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz 2003-11-26 21:17:29 +00:00
parent 9fea0c5c42
commit 20582afca5
1 changed files with 51 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

74
libsrc/apple2/apple2-280-192-6.s
View File

@ -2,8 +2,7 @@
; Graphics driver for the 280x192x6 mode on the Apple II
;
; Stefan Haubenthal <polluks@sdf.lonestar.org>
; Based on Stephen L. Judd's GRLIB code and
; Maciej Witkowiak's circle routine
; Based on Maciej Witkowiak's circle routine
;
.include "zeropage.inc"
@ -233,7 +232,7 @@ INIT:
; Switch into graphics mode
jsr HGR
lda MIXOFF
bit MIXOFF
; Done, reset the error code
@ -289,9 +288,9 @@ CLEAR = HCLR
SETVIEWPAGE:
tax
beq @L1
lda PG2ON
bit PG2ON
rts
@L1: lda PG2OFF
@L1: bit PG2OFF
rts
; ------------------------------------------------------------------------
@ -393,7 +392,7 @@ SETPIXEL:
ldy X1+1
lda Y1
jmp HPLOT
; ------------------------------------------------------------------------
; GETPIXEL: Read the color value of a pixel and return it in A/X. The
; coordinates passed to this function are never outside the visible screen
@ -401,9 +400,38 @@ SETPIXEL:
GETPIXEL:
lda #TGI_ERR_INV_FUNC
sta ERROR
rts
ldx X1
ldy X1+1
lda Y1
jsr HPOSN ; 1st pixel
HBASL = $26
HMASK = $30
ldx #0
lda (HBASL),y
and HMASK
beq @L1
inx
@L1: stx tmp1
lda $E0 ; which neighbour
tax
and #$01
bne @odd
asl tmp1
inx
.byte $24
@odd: dex
ldy $E1
lda $E2
jsr HPOSN ; 2nd pixel
ldx #0
lda (HBASL),y
and HMASK
beq @L2
inx
@L2: txa
ora tmp1
ldx #0
rts
; ------------------------------------------------------------------------
; LINE: Draw a line from X1/Y1 to X2/Y2, where X1/Y1 = ptr1/ptr2 and
@ -413,14 +441,14 @@ GETPIXEL:
;
LINE:
ldx X1
ldy X1+1
lda Y1
jsr HPOSN
lda X2
ldx X2+1
ldy Y2
jmp HLIN
ldx X1
ldy X1+1
lda Y1
jsr HPOSN
lda X2
ldx X2+1
ldy Y2
jmp HLIN
; ------------------------------------------------------------------------
; BAR: Draw a filled rectangle with the corners X1/Y1, X2/Y2, where
@ -428,12 +456,12 @@ LINE:
; Contrary to most other functions, the graphics kernel will sort and clip
; the coordinates before calling the driver, so on entry the following
; conditions are valid:
; X1 <= X2
; Y1 <= Y2
; (X1 >= 0) && (X1 < XRES)
; (X2 >= 0) && (X2 < XRES)
; (Y1 >= 0) && (Y1 < YRES)
; (Y2 >= 0) && (Y2 < YRES)
; X1 <= X2
; Y1 <= Y2
; (X1 >= 0) && (X1 < XRES)
; (X2 >= 0) && (X2 < XRES)
; (Y1 >= 0) && (Y1 < YRES)
; (Y2 >= 0) && (Y2 < YRES)
;
; Must set an error code: NO
;