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Settings: route Framerate Cap to the guest-side pacer when native render is on

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This commit is contained in:
mchughalex 2026-07-11 08:33:49 +01:00
parent c9dfb18375
commit 9d9504aa02
1 changed files with 46 additions and 16 deletions
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58
src/ui/overlay/simple_settings_overlay.cpp
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@ -22,10 +22,11 @@ constexpr std::array<int32_t, 3> kResolutionScales = {1, 2, 3};
constexpr std::array<const char*, 3> kResolutionLabels = {"720p (1x)", "1440p (2x)",
"2160p (3x)"};
constexpr std::array<const char*, 2> kAspectRatioLabels = {"16:9", "21:9 (Experimental)"};
constexpr std::array<double, 6> kFrameCapRates = {60.0, 90.0, 120.0, 144.0, 165.0, 240.0};
constexpr std::array<const char*, 7> kFrameCapLabels = {"Unlimited", "60 FPS", "90 FPS",
"120 FPS", "144 FPS", "165 FPS",
"240 FPS"};
constexpr std::array<double, 7> kFrameCapRates = {60.0, 90.0, 120.0, 140.0,
144.0, 165.0, 240.0};
constexpr std::array<const char*, 8> kFrameCapLabels = {"Unlimited", "60 FPS", "90 FPS",
"120 FPS", "140 FPS", "144 FPS",
"165 FPS", "240 FPS"};
constexpr std::array<std::string_view, 7> kCoreSimpleSettingsCvars = {
"resolution_scale",
"draw_resolution_scale_x",
@ -57,6 +58,9 @@ std::vector<std::string_view> GetSimpleSettingsCvars() {
if (HasCvar("skate3_field_of_view")) {
cvars.push_back("skate3_field_of_view");
}
if (HasCvar("skate3_guest_fps_cap")) {
cvars.push_back("skate3_guest_fps_cap");
}
if (HasCvar("d3d12_present_frame_limiter")) {
cvars.push_back("d3d12_present_frame_limiter");
}
@ -105,18 +109,35 @@ int ResolutionIndexFromCvar() {
return best;
}
bool HasFrameCapCvars() {
bool HasHostFrameCapCvars() {
return HasCvar("d3d12_present_frame_limiter") && HasCvar("d3d12_present_frame_limiter_fps");
}
// The guest-side cap paces the game's render loop at the swap boundary, so
// both content production and present cadence land on an even beat (the VRR
// case the host present limiter can't fix: it only delays presents of frames
// whose content was already produced on an irregular schedule). It works on
// any backend, but only when the native-render hook layer that implements it
// is active; otherwise fall back to the host present limiter.
bool UseGuestFrameCap() {
return HasCvar("skate3_guest_fps_cap") && HasCvar("skate3_native_render") &&
rex::cvar::Query<bool>("skate3_native_render");
}
bool HasFrameCapControl() {
return UseGuestFrameCap() || HasHostFrameCapCvars();
}
int FrameCapIndexFromCvar() {
if (!HasFrameCapCvars()) {
double current = 0.0;
if (UseGuestFrameCap()) {
current = rex::cvar::Query<double>("skate3_guest_fps_cap");
} else if (HasHostFrameCapCvars() && rex::cvar::Query<bool>("d3d12_present_frame_limiter")) {
current = rex::cvar::Query<double>("d3d12_present_frame_limiter_fps");
}
if (current < 1.0) {
return 0;
}
if (!rex::cvar::Query<bool>("d3d12_present_frame_limiter")) {
return 0;
}
double current = rex::cvar::Query<double>("d3d12_present_frame_limiter_fps");
int best = 1;
double best_delta = 1000.0;
for (int i = 0; i < static_cast<int>(kFrameCapRates.size()); ++i) {
@ -330,13 +351,22 @@ void SimpleSettingsDialog::SaveVideo() {
rex::cvar::SetFlagByName("resolution_scale", scale);
rex::cvar::SetFlagByName("draw_resolution_scale_x", scale);
rex::cvar::SetFlagByName("draw_resolution_scale_y", scale);
if (HasFrameCapCvars()) {
SetBoolCvar("d3d12_present_frame_limiter", frame_cap_index_ != 0);
if (UseGuestFrameCap()) {
const double cap_fps = frame_cap_index_ != 0 ? kFrameCapRates[frame_cap_index_ - 1] : 0.0;
rex::cvar::SetFlagByName("skate3_guest_fps_cap", std::to_string(cap_fps));
// Never run both pacers: the host limiter waits on the paint thread
// without backpressuring the guest, so presents drop frames on an
// irregular beat: the judder the guest cap exists to remove.
if (HasHostFrameCapCvars()) {
SetBoolCvar("d3d12_present_frame_limiter", false);
}
if (HasFrameCapCvars() && frame_cap_index_ != 0) {
} else if (HasHostFrameCapCvars()) {
SetBoolCvar("d3d12_present_frame_limiter", frame_cap_index_ != 0);
if (frame_cap_index_ != 0) {
rex::cvar::SetFlagByName("d3d12_present_frame_limiter_fps",
std::to_string(kFrameCapRates[frame_cap_index_ - 1]));
}
}
SetBoolCvar("fullscreen", fullscreen_);
if (HasCvar("skate3_ultrawide")) {
SetBoolCvar("skate3_ultrawide", aspect_ratio_index_ != 0);
@ -485,7 +515,7 @@ void SimpleSettingsDialog::OnDraw(ImGuiIO& io) {
static_cast<int>(kResolutionLabels.size()));
EndFieldRow();
if (HasFrameCapCvars()) {
if (HasFrameCapControl()) {
BeginFieldRow("Framerate Cap");
ImGui::Combo("##frame_cap", &frame_cap_index_, kFrameCapLabels.data(),
static_cast<int>(kFrameCapLabels.size()));