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render: refresh-derived automatic guest frame cap

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This commit is contained in:
mchughalex 2026-07-19 15:33:19 +01:00
parent 9088059ed5
commit 1e4c963486
1 changed files with 20 additions and 1 deletions
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21
src/skate3_native_render.cpp
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@ -21,6 +21,7 @@
#include <rex/cvar.h>
#include <rex/logging.h>
#include <rex/ui/window.h>
REXCVAR_DEFINE_BOOL(skate3_native_render, false, "Skate 3",
"Enable the Skate 3 data-driven native renderer hook layer")
@ -41,6 +42,16 @@ REXCVAR_DEFINE_DOUBLE(skate3_guest_fps_cap, 0.0, "Skate 3",
"~1.5 ms before the target, then spin.")
.range(0.0, 1000.0)
.lifecycle(rex::cvar::Lifecycle::kHotReload);
REXCVAR_DEFINE_BOOL(skate3_guest_fps_cap_auto, false, "Skate 3",
"Derive the guest frame cap from the display the window is on: "
"cap at (refresh rate - 4) fps, the VRR recipe above, without "
"hand-tuning per monitor. Above the display refresh the extra "
"frames cannot be shown anyway; refreshes beat-sample the "
"frame stream and steady motion judders (measured: a "
"mathematically perfect synthetic pan judders at 330 fps on a "
"144 Hz panel and is smooth capped below it). Overrides "
"skate3_guest_fps_cap while the display refresh is known.")
.lifecycle(rex::cvar::Lifecycle::kHotReload);
namespace skate3::native_render {
namespace {
@ -128,7 +139,15 @@ void OnClothDraw(uint8_t* base, uint32_t r4, uint32_t r5, uint32_t r6, uint32_t
// interval) so sleep jitter never accumulates; resyncs when the guest falls
// more than one interval behind (loads, hitches).
void PaceGuestFrame() {
const double cap = REXCVAR_GET(skate3_guest_fps_cap);
double cap = REXCVAR_GET(skate3_guest_fps_cap);
if (REXCVAR_GET(skate3_guest_fps_cap_auto)) {
// Refresh-derived cap (see the cvar). Falls through to the explicit cap
// while the platform hasn't reported a refresh rate.
const double hz = double(rex::ui::Window::CachedDisplayRefreshHz());
if (hz >= 30.0) {
cap = hz - 4.0;
}
}
static std::chrono::steady_clock::time_point s_next{};
if (cap < 1.0) {
s_next = {};