the10thwiz/cc65
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Upgraded the cx16 library to the Commander X16 Kernal ROM's prerelease 39.

Browse Source
This commit is contained in:
Greg King
2022-04-02 09:39:35 -04:00
parent 75ee10478e
commit a5e69e7ea6
18 changed files with 208 additions and 172 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
libsrc/cx16/videomode.s
View File

@@ -1,10 +1,15 @@
;
; 2020-01-06, Greg King
; 2022-03-28, Greg King
;
; /* Video mode defines */
; #define VIDEOMODE_40x30 0x00
; #define VIDEOMODE_80x60 0x02
; #define VIDEOMODE_320x200 0x80
; #define VIDEOMODE_80x60 0x00
; #define VIDEOMODE_80x30 0x01
; #define VIDEOMODE_40x60 0x02
; #define VIDEOMODE_40x30 0x03
; #define VIDEOMODE_40x15 0x04
; #define VIDEOMODE_20x30 0x05
; #define VIDEOMODE_20x15 0x06
; #define VIDEOMODE_320x240 0x80
; #define VIDEOMODE_SWAP (-1)
;
; signed char __fastcall__ videomode (signed char Mode);
@@ -16,25 +21,26 @@
.export _videomode
.import SCREEN_SET_MODE
.include "cx16.inc"
.import SCREEN_MODE
.proc _videomode
ldx SCREEN_MODE ; Get old mode
phx
jsr SCREEN_SET_MODE
sec ; Get old mode
pha
jsr SCREEN_MODE
plx
pha ; Save old mode
txa
clc ; Set new mode
jsr SCREEN_MODE
pla ; Get back old mode
ldx #>$0000 ; Clear high byte
bcs @L1
rts
bcc @L1
; The new mode is invalid. Go back to the old one. Return -1.
; The new mode is invalid. Return -1.
@L1: sta SCREEN_MODE
dex
txa
rts
@L1: rts
.endproc