diff options
| author | cinap_lenrek <cinap_lenrek@gmx.de> | 2012-07-18 10:16:00 +0200 |
|---|---|---|
| committer | cinap_lenrek <cinap_lenrek@gmx.de> | 2012-07-18 10:16:00 +0200 |
| commit | b9ca8e83784b94e709e7d412eb4f87fa0a1885a8 (patch) | |
| tree | e941217032e777d7ec33805930924d7fdd265aec /sys/src/9/pc/devvga.c | |
| parent | 5654f15e56087986812c557412d558482383fc8b (diff) | |
vga: softscreen
allow the shadow framebuffer (softscreen) to be used with any
vga driver, not just vesa. this removes the ugly scr->paddr = 0
hack employed by vesa driver to force softscreen and adds a
softscreen vgactl message that can switch the feature on and off
at runtime.
softscreen can greatly improve graphics performance when bus
reads are slow even tho it disables hardware acceleration.
Diffstat (limited to 'sys/src/9/pc/devvga.c')
| -rw-r--r-- | sys/src/9/pc/devvga.c | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/sys/src/9/pc/devvga.c b/sys/src/9/pc/devvga.c index d9ddf9239..087088434 100644 --- a/sys/src/9/pc/devvga.c +++ b/sys/src/9/pc/devvga.c @@ -46,6 +46,7 @@ enum { CMtextmode, CMtype, CMunblank, + CMsoftscreen, }; static Cmdtab vgactlmsg[] = { @@ -63,6 +64,7 @@ static Cmdtab vgactlmsg[] = { CMtextmode, "textmode", 1, CMtype, "type", 2, CMunblank, "unblank", 1, + CMsoftscreen, "softscreen", 2, }; static void @@ -200,6 +202,7 @@ vgaread(Chan* c, void* a, long n, vlong off) len += snprint(p+len, READSTR-len, "hwblank %s\n", hwblank ? "on" : "off"); len += snprint(p+len, READSTR-len, "panning %s\n", panning ? "on" : "off"); len += snprint(p+len, READSTR-len, "addr p 0x%lux v 0x%p size 0x%ux\n", scr->paddr, scr->vaddr, scr->apsize); + len += snprint(p+len, READSTR-len, "softscreen %s\n", scr->softscreen ? "on" : "off"); USED(len); n = readstr(offset, a, n, p); @@ -352,18 +355,36 @@ vgactl(Cmdbuf *cb) scr->palettedepth = x; return; + case CMsoftscreen: + if(strcmp(cb->f[1], "on") == 0) + scr->softscreen = 1; + else if(strcmp(cb->f[1], "off") == 0) + scr->softscreen = 0; + else + break; + if(scr->gscreen == nil) + return; + x = scr->gscreen->r.max.x; + y = scr->gscreen->r.max.y; + z = scr->gscreen->depth; + chan = scr->gscreen->chan; + cursoroff(1); + deletescreenimage(); + if(screensize(x, y, z, chan)) + error(Egreg); + /* no break */ case CMdrawinit: if(scr->gscreen == nil) error("drawinit: no gscreen"); if(scr->dev && scr->dev->drawinit) scr->dev->drawinit(scr); hwblank = scr->blank != nil; - hwaccel = scr->scroll || scr->fill; + hwaccel = !scr->softscreen && (scr->scroll || scr->fill); vgascreenwin(scr); resetscreenimage(); cursoron(1); return; - + case CMlinear: if(cb->nf!=2 && cb->nf!=3) error(Ebadarg); |