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Sleep a bit more precise

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This commit is contained in:
Edgaru089 2024-03-07 09:55:36 +08:00
parent bbca75539e
commit 4ec2805a5d
2 changed files with 34 additions and 9 deletions
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41
types.c
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@ -1,6 +1,10 @@
#include "types.h"
#include <math.h>
#include <stdio.h>
#ifdef WIN32_LEAN_AND_MEAN
#undef WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#include <timeapi.h>
@ -61,6 +65,12 @@ bool box2_Intersects(const Box2 x, const Box2 y, Box2 *out_intersection) {
}
}
Vec2 box2_Center(Box2 box) {
return vec2(
box.lefttop.x + box.size.x / 2.0,
box.lefttop.y + box.size.y / 2.0);
}
Box2 box2_Offset(Box2 box, Vec2 offset) {
box.lefttop = vec2_Add(box.lefttop, offset);
return box;
@ -78,16 +88,29 @@ Box2 box2_OffsetY(Box2 box, double offsetY) {
static double freqInverse = 0.0;
// https://stackoverflow.com/a/31411628
// "How to make thread sleep less than a millisecond on Windows"
typedef NTSTATUS(__stdcall *NtDelayExecution_Type)(BOOL Alertable, PLARGE_INTEGER DelayInterval);
typedef NTSTATUS(__stdcall *ZwSetTimerResolution_Type)(IN ULONG RequestedResolution, IN BOOLEAN Set, OUT PULONG ActualResolution);
static NtDelayExecution_Type NtDelayExecution;
static ZwSetTimerResolution_Type ZwSetTimerResolution;
void duration_Sleep(const Duration t) {
if (t.microseconds <= 0)
return;
// https://learn.microsoft.com/zh-cn/windows/win32/api/timeapi/nf-timeapi-timebeginperiod
// timeBeginPeriod() and friends
TIMECAPS tc;
timeGetDevCaps(&tc, sizeof(TIMECAPS));
timeBeginPeriod(tc.wPeriodMin);
Sleep((DWORD)(round(duration_Milliseconds(t)))); // Only millisecond precision. Sad
timeEndPeriod(tc.wPeriodMin);
if (!NtDelayExecution) {
NtDelayExecution = (NtDelayExecution_Type)GetProcAddress(GetModuleHandle("ntdll.dll"), "NtDelayExecution");
ZwSetTimerResolution = (ZwSetTimerResolution_Type)GetProcAddress(GetModuleHandle("ntdll.dll"), "ZwSetTimerResolution");
// Only run this once
ULONG actualResolution;
ZwSetTimerResolution(1, true, &actualResolution);
fprintf(stderr, "[duration_Sleep] ActualResolution was %u\n", actualResolution);
}
LARGE_INTEGER interval;
interval.QuadPart = t.microseconds * -10;
NtDelayExecution(false, &interval);
}
TimePoint time_Now() {

2
types.h
View File

@ -42,6 +42,8 @@ typedef struct {
// Intersection test.
bool box2_Intersects(const Box2 x, const Box2 y, Box2 *out_intersection);
Vec2 box2_Center(Box2 box);
Box2 box2_Offset(Box2 box, Vec2 offset);
Box2 box2_OffsetX(Box2 box, double offsetX);
Box2 box2_OffsetY(Box2 box, double offsetY);