FramerateLimiter.java

net.minecraft.client.FramerateLimiter

信息

• 全限定名：net.minecraft.client.FramerateLimiter
• 类型：public class
• 包：net.minecraft.client
• 源码路径：src/main/java/net/minecraft/client/FramerateLimiter.java
• 起始行号：L8
• 职责：

  TODO

字段/常量

• OVERSHOOT_SMOOTHING

  • 类型: double
  • 修饰符: private static final
  • 源码定位: L9
  • 说明:

    TODO

• MAX_CURRENT_OVERSHOOT_NS

  • 类型: long
  • 修饰符: private static final
  • 源码定位: L10
  • 说明:

    TODO

• MAX_AVERAGE_OVERSHOOT_NS

  • 类型: long
  • 修饰符: private static final
  • 源码定位: L11
  • 说明:

    TODO

• ONE_SECOND_IN_NANOSECONDS

  • 类型: long
  • 修饰符: private static final
  • 源码定位: L12
  • 说明:

    TODO

• SPIN_SAFETY_BUFFER_NS

  • 类型: long
  • 修饰符: private static final
  • 源码定位: L13
  • 说明:

    TODO

• lastFrameTime

  • 类型: long
  • 修饰符: private static
  • 源码定位: L14
  • 说明:

    TODO

• averageOvershootNs

  • 类型: long
  • 修饰符: private static
  • 源码定位: L15
  • 说明:

    TODO

• lastFramerateLimit

  • 类型: int
  • 修饰符: private static
  • 源码定位: L16
  • 说明:

    TODO

内部类/嵌套类型

• 无

构造器

• 无

方法

下面的方法块按源码顺序生成。

public static void limitDisplayFPS(int framerateLimit) @ L18

• 方法名：limitDisplayFPS
• 源码定位：L18
• 返回类型：void
• 修饰符：public static

参数:

• framerateLimit: int

说明:

TODO

代码

@OnlyIn(Dist.CLIENT)
public class FramerateLimiter {
    private static final double OVERSHOOT_SMOOTHING = 0.1;
    private static final long MAX_CURRENT_OVERSHOOT_NS = 25000000L;
    private static final long MAX_AVERAGE_OVERSHOOT_NS = 2000000L;
    private static final long ONE_SECOND_IN_NANOSECONDS = 1000000000L;
    private static final long SPIN_SAFETY_BUFFER_NS = 500000L;
    private static long lastFrameTime = System.nanoTime();
    private static long averageOvershootNs = 0L;
    private static int lastFramerateLimit;
 
    public static void limitDisplayFPS(int framerateLimit) {
        long targetTimePerFrame = 1000000000L / framerateLimit;
        long targetTimeNs = lastFrameTime + targetTimePerFrame;
        if (framerateLimit != lastFramerateLimit) {
            averageOvershootNs = 0L;
            lastFramerateLimit = framerateLimit;
        }
 
        long remainingTimeNs;
        while ((remainingTimeNs = targetTimeNs - System.nanoTime()) > 0L) {
            if (remainingTimeNs > averageOvershootNs + 500000L) {
                long sleepStartTimeNs = System.nanoTime();
                long expectedSleepTimeNs = remainingTimeNs - averageOvershootNs - 500000L;
                if (!Thread.interrupted()) {
                    LockSupport.parkNanos(expectedSleepTimeNs);
                    long sleepDurationNs = System.nanoTime() - sleepStartTimeNs;
                    long currentOvershootNs = sleepDurationNs - expectedSleepTimeNs;
                    if (currentOvershootNs > 0L && currentOvershootNs < 25000000L) {
                        averageOvershootNs = (long)(0.1 * currentOvershootNs + 0.9 * averageOvershootNs);
                        averageOvershootNs = Math.min(averageOvershootNs, 2000000L);
                    }
                }
            } else {
                Thread.onSpinWait();
            }
        }
 
        lastFrameTime = System.nanoTime();
    }
}

引用的其他类

• LoggedChatMessage
  • 引用位置: 方法调用
  • 关联成员: System.nanoTime()