FPS cap

usernameak · Sep 14, 2024 · 2ff004a · 2ff004a
1 parent b42e68c
commit 2ff004a
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Showing 3 changed files with 47 additions and 1 deletion.
diff --git a/src/main/java/net/sktemu/ams/AppDeviceProfile.java b/src/main/java/net/sktemu/ams/AppDeviceProfile.java
@@ -7,6 +7,7 @@
 public class AppDeviceProfile {
     private int screenWidth = 240;
     private int screenHeight = 320;
+    private int maxFps = 0;
     private boolean secureUtilWorkaround = false;
 
     public void loadDeviceProfile(File file) throws IOException {
@@ -25,6 +26,10 @@ public void loadDeviceProfile(File file) throws IOException {
             screenHeight = Integer.parseInt(propertyTable.getProperty("screenHeight", "320"));
         } catch (NumberFormatException ignored) {
         }
+        try {
+            maxFps = Integer.parseInt(propertyTable.getProperty("maxFps", "0"));
+        } catch (NumberFormatException ignored) {
+        }
 
         secureUtilWorkaround = Boolean.parseBoolean(propertyTable.getProperty("secureUtilWorkaround", "false"));
     }
@@ -34,6 +39,7 @@ public void saveDeviceProfile(File file) throws IOException {
 
         propertyTable.setProperty("screenWidth", Integer.toString(screenWidth));
         propertyTable.setProperty("screenHeight", Integer.toString(screenHeight));
+        propertyTable.setProperty("maxFps", Integer.toString(maxFps));
         propertyTable.setProperty("secureUtilWorkaround", Boolean.toString(secureUtilWorkaround));
 
         try (OutputStream stream = new FileOutputStream(file);
@@ -58,6 +64,14 @@ public void setScreenHeight(int screenHeight) {
         this.screenHeight = screenHeight;
     }
 
+    public int getMaxFps() {
+        return maxFps;
+    }
+
+    public void setMaxFps(int maxFps) {
+        this.maxFps = maxFps;
+    }
+
     public boolean getSecureUtilWorkaround() {
         return secureUtilWorkaround;
     }

diff --git a/src/main/java/net/sktemu/ams/AppInstance.java b/src/main/java/net/sktemu/ams/AppInstance.java
@@ -31,6 +31,10 @@ public class AppInstance implements AutoCloseable {
 
     private ExecutorService appThreadExecutor;
 
+    private final Object frameLimiterLock = new Object();
+
+    private long lastPresentTime = 0;
+
     static {
         AmsSysPropManager.init();
     }
@@ -180,6 +184,30 @@ public Graphics getMidpGraphics() {
     }
 
     public void blitGraphics() {
+        int maxFps = getAppModel().getDeviceProfile().getMaxFps();
+
+        if (maxFps > 0) {
+            synchronized (frameLimiterLock) {
+                long presentTime = System.nanoTime();
+                long deltaTime = 1_000_000_000L / maxFps - (presentTime - lastPresentTime);
+
+                if (deltaTime > 0) {
+                    try {
+                        Thread.sleep(deltaTime / 1_000_000L, (int) (deltaTime % 1_000_000));
+                    } catch (InterruptedException ignored) {
+                        Thread.currentThread().interrupt();
+                        return;
+                    }
+                }
+
+                if (deltaTime < -20_000_000L) {
+                    lastPresentTime = presentTime - 20; // overrun
+                } else {
+                    lastPresentTime = presentTime + deltaTime;
+                }
+            }
+        }
+
         synchronized (emuCanvas.getBufferedImage()) {
             backbufferImage.copyData(emuCanvas.getBufferedImage().getRaster());
         }

diff --git a/src/main/java/net/sktemu/launcher/DeviceProfileEditor.java b/src/main/java/net/sktemu/launcher/DeviceProfileEditor.java
@@ -17,16 +17,19 @@ public DeviceProfileEditor(Frame owner, AppModel appModel) {
         AppDeviceProfile deviceProfile = appModel.getDeviceProfile();
 
         JPanel mainPanel = new JPanel();
-        mainPanel.setLayout(new MigLayout("", "[][80,grow,fill]", "[][][][nogrid]"));
+        mainPanel.setLayout(new MigLayout("", "[][80,grow,fill]", "[][][][][nogrid]"));
 
         JTextField tfScreenWidth = new JTextField(Integer.toString(deviceProfile.getScreenWidth()));
         JTextField tfScreenHeight = new JTextField(Integer.toString(deviceProfile.getScreenHeight()));
+        JTextField tfMaxFps = new JTextField(Integer.toString(deviceProfile.getMaxFps()));
         JCheckBox cbSecureUtilWorkaround = new JCheckBox("SecureUtil Workaround", deviceProfile.getSecureUtilWorkaround());
 
         mainPanel.add(new JLabel("Screen Width:"));
         mainPanel.add(tfScreenWidth, "wrap");
         mainPanel.add(new JLabel("Screen Height:"));
         mainPanel.add(tfScreenHeight, "wrap");
+        mainPanel.add(new JLabel("Max FPS:"));
+        mainPanel.add(tfMaxFps, "wrap");
         mainPanel.add(cbSecureUtilWorkaround, "spanx 2,wrap");
 
         Action okAction = new AbstractAction("OK") {
@@ -35,6 +38,7 @@ public void actionPerformed(ActionEvent e) {
                 try {
                     deviceProfile.setScreenWidth(Integer.parseInt(tfScreenWidth.getText()));
                     deviceProfile.setScreenHeight(Integer.parseInt(tfScreenHeight.getText()));
+                    deviceProfile.setMaxFps(Integer.parseInt(tfMaxFps.getText()));
                     deviceProfile.setSecureUtilWorkaround(cbSecureUtilWorkaround.isSelected());
                 } catch (NumberFormatException ex) {
                     JOptionPane.showMessageDialog(