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video: another method to make a base VRR video mode.

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This commit is contained in:
Sorgelig
2022-07-01 04:11:45 +08:00
parent 0afae31c31
commit 9eca861734
1 changed files with 10 additions and 3 deletions
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13
video.cpp
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@@ -1663,9 +1663,10 @@ static void set_video(vmode_custom_t *v, double Fpix)
if (use_vrr)
{
printf("Requested variable refresh rate: min=%dHz, max=%dHz\n", vrr_min_fr, vrr_max_fr);
int horz = v_fix.param.hact + v_fix.param.hbp + v_fix.param.hfp + v_fix.param.hs;
#if 0
// variant 1: try to reduce vblank to reach max refresh rate but keep original pixel clock.
// try to adjust VBlank to match max refresh
int vbl_fmax = ((v_cur.Fpix * 1000000.f) / (vrr_max_fr * horz)) - v_fix.param.vact - v_fix.param.vs - 1;
if (vbl_fmax < 2) vbl_fmax = 2;
@@ -1676,8 +1677,14 @@ static void set_video(vmode_custom_t *v, double Fpix)
v_fix.param.vfp = 1;
v_fix.param.vbp = vbl_fmax - 1;
}
int vert = v_fix.param.vact + v_fix.param.vbp + v_fix.param.vfp + v_fix.param.vs;
#else
// variant 2: keep original vblank and adjust pixel clock to max refresh rate
int vert = v_fix.param.vact + v_fix.param.vbp + v_fix.param.vfp + v_fix.param.vs;
Fpix = horz * vert * vrr_max_fr;
Fpix /= 1000000.f;
setPLL(Fpix, &v_cur);
#endif
double freq_max = (v_cur.Fpix * 1000000.f) / (horz * vert);
double freq_min = vrr_min_fr;
@@ -3027,7 +3034,7 @@ void video_cmd(char *cmd)
}
}
static constexpr int CELL_GRAN_RND = 8;
static constexpr int CELL_GRAN_RND = 4;
static int determine_vsync(int w, int h)
{