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core_timing: Use CNTPCT as the guest CPU tick

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Previously, we were mixing the raw CPU frequency and CNTFRQ.
The raw CPU frequency (1020 MHz) should've never been used as CNTPCT (whose frequency is CNTFRQ) is the only counter available.
This commit is contained in:
Morph 2023-04-23 00:01:08 -04:00
parent fb3bb63880
commit 2856fadaa0
14 changed files with 47 additions and 122 deletions
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14
src/video_core/gpu.cpp
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@ -194,17 +194,17 @@ struct GPU::Impl {
[[nodiscard]] u64 GetTicks() const {
// This values were reversed engineered by fincs from NVN
// The gpu clock is reported in units of 385/625 nanoseconds
constexpr u64 gpu_ticks_num = 384;
constexpr u64 gpu_ticks_den = 625;
// The GPU clock is 614.4 MHz
using NsToGPUTickRatio = std::ratio<614'400'000, std::nano::den>;
static_assert(NsToGPUTickRatio::num == 384 && NsToGPUTickRatio::den == 625);
u64 nanoseconds = system.CoreTiming().GetGlobalTimeNs().count();
u64 nanoseconds = system.CoreTiming().GetCPUTimeNs().count();
if (Settings::values.use_fast_gpu_time.GetValue()) {
nanoseconds /= 256;
}
const u64 nanoseconds_num = nanoseconds / gpu_ticks_den;
const u64 nanoseconds_rem = nanoseconds % gpu_ticks_den;
return nanoseconds_num * gpu_ticks_num + (nanoseconds_rem * gpu_ticks_num) / gpu_ticks_den;
return nanoseconds * NsToGPUTickRatio::num / NsToGPUTickRatio::den;
}
[[nodiscard]] bool IsAsync() const {