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Qcommon_Frame(): Improve max framerate handling when vsync is enabled
When setting rfps based on GLimp_GetRefreshRate() and vid_maxfps, take into account that GLimp_GetRefreshRate() might return a value that's slightly too low (like 58 or 59 when it's 59.95 and should be 60) The 20% tolerance that, in case of vsync enabled, used to be handled with `packetdelta < 0.8 * 1000000/pfps` (and the same for rfps) is now instead added to rfps (and thus implicitly pfps, if it's >= refreshrate)
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2 changed files with 32 additions and 31 deletions
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@ -211,7 +211,7 @@ typedef struct
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keydest_t key_dest;
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int framecount;
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int realtime; /* always increasing, no clamping, etc */
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int realtime; /* always increasing, no clamping, etc, in MS */
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float rframetime; /* seconds since last render frame */
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float nframetime; /* network frame time */
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@ -550,21 +550,38 @@ Qcommon_Frame(int usec)
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// Calculate target and renderframerate.
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if (R_IsVSyncActive())
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{
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rfps = GLimp_GetRefreshRate();
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int refreshrate = GLimp_GetRefreshRate();
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if (rfps > vid_maxfps->value)
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// using refreshRate - 2, because targeting a value slightly below the
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// (possibly not 100% correctly reported) refreshRate would introduce jittering, so only
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// use vid_maxfps if it looks like the user really means it to be different from refreshRate
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if (vid_maxfps->value < refreshrate - 2 )
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{
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rfps = (int)vid_maxfps->value;
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// we can't have more packet frames than render frames, so limit pfps to rfps
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pfps = (cl_maxfps->value > rfps) ? rfps : cl_maxfps->value;
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}
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else // target refresh rate, not vid_maxfps
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{
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// if vsync is active, we increase the target framerate a bit for two reasons
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// 1. On Windows, GLimp_GetFrefreshRate() (or the SDL counterpart, or even
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// the underlying WinAPI function) often returns a too small value,
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// like 58 or 59 when it's really 59.95 and thus (as integer) should be 60
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// 2. vsync will throttle us to refreshrate anyway, so there is no harm
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// in starting the frame *a bit* earlier, instead of risking starting
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// it too late
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rfps = refreshrate * 1.2f;
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// we can't have more packet frames than render frames, so limit pfps to rfps
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// but in this case use tolerance for comparison and assign rfps with tolerance
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pfps = (cl_maxfps->value < refreshrate - 2) ? cl_maxfps->value : rfps;
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}
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}
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else
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{
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rfps = (int)vid_maxfps->value;
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}
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// we can't have more packet frames than render frames, so limit pfps to rfps
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pfps = (cl_maxfps->value > rfps) ? rfps : cl_maxfps->value;
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}
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// Calculate timings.
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packetdelta += usec;
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@ -575,22 +592,6 @@ Qcommon_Frame(int usec)
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if (!cl_timedemo->value)
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{
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if (cl_async->value)
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{
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if (R_IsVSyncActive())
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{
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// Network frames.
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if (packetdelta < (0.8 * (1000000.0f / pfps)))
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{
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packetframe = false;
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}
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// Render frames.
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if (renderdelta < (0.8 * (1000000.0f / rfps)))
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{
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renderframe = false;
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}
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}
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else
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{
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// Network frames.
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if (packetdelta < (1000000.0f / pfps))
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@ -599,11 +600,11 @@ Qcommon_Frame(int usec)
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}
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// Render frames.
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if (renderdelta < (1000000.0f ) / rfps)
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if (renderdelta < (1000000.0f / rfps))
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{
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renderframe = false;
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}
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}
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if (!renderframe)
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{
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// we must have at least one render frame between two packet frames
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