From 2783471daa739cff1dfdad7435503d4e741660d0 Mon Sep 17 00:00:00 2001 From: SarahW Date: Wed, 8 Aug 2018 22:15:21 +0100 Subject: [PATCH] Clamp SVGA display on/off timings to a minimum of 1 usec. Fixes hang on Windows XP boot with ViRGE/DX. --- src/vid_svga.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/src/vid_svga.c b/src/vid_svga.c index 8f774cf..40e0e78 100644 --- a/src/vid_svga.c +++ b/src/vid_svga.c @@ -435,6 +435,10 @@ void svga_recalctimings(svga_t *svga) svga->dispontime = (uint64_t)_dispontime; svga->dispofftime = (uint64_t)_dispofftime; + if (svga->dispontime < TIMER_USEC) + svga->dispontime = TIMER_USEC; + if (svga->dispofftime < TIMER_USEC) + svga->dispofftime = TIMER_USEC; /* printf("SVGA horiz total %i display end %i vidclock %f\n",svga->crtc[0],svga->crtc[1],svga->clock); printf("SVGA vert total %i display end %i max row %i vsync %i\n",svga->vtotal,svga->dispend,(svga->crtc[9]&31)+1,svga->vsyncstart); printf("total %f on %i cycles off %i cycles frame %i sec %i %02X\n",disptime*crtcconst,svga->dispontime,svga->dispofftime,(svga->dispontime+svga->dispofftime)*svga->vtotal,(svga->dispontime+svga->dispofftime)*svga->vtotal*70,svga->seqregs[1]);