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Implemented CL-GD5429 VCLK control.

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This commit is contained in:
SarahW 2018-02-15 21:19:59 +00:00
commit 6c41e5baa8
1 changed files with 30 additions and 0 deletions
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30
src/vid_cl5429.c
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@ -358,6 +358,9 @@ void gd5429_recalc_mapping(gd5429_t *gd5429)
void gd5429_recalctimings(svga_t *svga)
{
gd5429_t *gd5429 = (gd5429_t *)svga->p;
int clock = (svga->miscout >> 2) & 3;
int n, d, p;
double vclk;
if (!svga->rowoffset)
svga->rowoffset = 0x100;
@ -396,6 +399,22 @@ void gd5429_recalctimings(svga_t *svga)
else
svga->render = svga_render_15bpp_highres;
}
n = svga->seqregs[0xb + clock] & 0x7f;
d = (svga->seqregs[0x1b + clock] >> 1) & 0x1f;
p = svga->seqregs[0x1b + clock] & 1;
vclk = (14318184.0 * ((float)n / (float)d)) / (float)(1 + p);
switch (svga->seqregs[7] & 6)
{
case 2:
vclk /= 2.0;
break;
case 4:
vclk /= 3.0;
break;
}
svga->clock = cpuclock / vclk;
}
void gd5429_hwcursor_draw(svga_t *svga, int displine)
@ -1105,6 +1124,17 @@ void *gd5429_init()
svga->hwcursor.xoff = 0;
gd5429->bank[1] = 0x8000;
/*Default VCLK values*/
svga->seqregs[0xb] = 0x66;
svga->seqregs[0xc] = 0x5b;
svga->seqregs[0xd] = 0x45;
svga->seqregs[0xe] = 0x7e;
svga->seqregs[0x1b] = 0x3b;
svga->seqregs[0x1c] = 0x2f;
svga->seqregs[0x1d] = 0x30;
svga->seqregs[0x1e] = 0x33;
return gd5429;
}