Added Anti-Aliasing to the Render Settings

src/main/java/com/replaymod/render/RenderSettings.java

@@ -1,6 +1,8 @@
 package com.replaymod.render;
 
+import lombok.AllArgsConstructor;
 import lombok.Data;
+import lombok.Getter;
 import net.minecraft.client.resources.I18n;
 import org.lwjgl.util.ReadableColor;
 
@@ -45,7 +47,7 @@ public class RenderSettings {
         }
 
         public String getValue() {
-            return "-y -f rawvideo -pix_fmt rgb24 -s %WIDTH%x%HEIGHT% -r %FPS% -i - " + preset;
+            return "-y -f rawvideo -pix_fmt rgb24 -s %WIDTH%x%HEIGHT% -r %FPS% -i - %FILTERS%" + preset;
         }
 
         public String getFileExtension() {
@@ -64,6 +66,19 @@ public class RenderSettings {
         }
     }
 
+    @AllArgsConstructor
+    public enum AntiAliasing {
+        NONE(1), X2(2), X4(4), X8(8);
+
+        @Getter
+        private final int factor;
+
+        @Override
+        public String toString() {
+            return I18n.format("replaymod.gui.rendersettings.antialiasing." + name().toLowerCase());
+        }
+    }
+
     private final RenderMethod renderMethod;
     private final EncodingPreset encodingPreset;
     private final int videoWidth;
@@ -78,9 +93,48 @@ public class RenderSettings {
     private final boolean stabilizeRoll;
     private final ReadableColor chromaKeyingColor;
     private final boolean inject360Metadata;
+    private final AntiAliasing antiAliasing;
 
     private final String exportCommand;
     private final String exportArguments;
 
     private final boolean highPerformance;
+
+    /**
+     * @return the width of the output video during rendering, including the upscale for Anti-Aliasing.
+     */
+    public int getVideoWidth() {
+        return videoWidth * antiAliasing.getFactor();
+    }
+
+    /**
+     * @return the height of the output video during rendering, including the upscale for Anti-Aliasing.
+     */
+    public int getVideoHeight() {
+        return videoHeight * antiAliasing.getFactor();
+    }
+
+    /**
+     * @return the actual width of the output video.
+     */
+    public int getTargetVideoWidth() {
+        return videoWidth;
+    }
+
+    /**
+     * @return the actual height of the output video.
+     */
+    public int getTargetVideoHeight() {
+        return videoHeight;
+    }
+
+    public String getVideoFilters() {
+        if (antiAliasing == AntiAliasing.NONE) {
+            return "";
+        } else {
+            double factor = 1.0 / antiAliasing.getFactor();
+            return String.format("-vf scale=iw*%1$s:ih*%1$s ", factor);
+        }
+    }
+
 }

src/main/java/com/replaymod/render/VideoWriter.java

@@ -43,7 +43,8 @@ public class VideoWriter implements FrameConsumer<RGBFrame> {
                     .replace("%HEIGHT%", String.valueOf(settings.getVideoHeight()))
                     .replace("%FPS%", String.valueOf(settings.getFramesPerSecond()))
                     .replace("%FILENAME%", fileName)
-                    .replace("%BITRATE%", String.valueOf(settings.getBitRate()));
+                    .replace("%BITRATE%", String.valueOf(settings.getBitRate()))
+                    .replace("%FILTERS%", settings.getVideoFilters());
 
         String executable = settings.getExportCommand().isEmpty() ? "ffmpeg" : settings.getExportCommand();
         System.out.println("Starting " + settings.getExportCommand() + " with args: " + commandArgs);

src/main/java/com/replaymod/render/gui/GuiRenderSettings.java

@@ -149,13 +149,18 @@ public class GuiRenderSettings extends GuiScreen implements Closeable {
     public final GuiCheckbox inject360Metadata = new GuiCheckbox()
             .setI18nLabel("replaymod.gui.rendersettings.360metadata");
 
+    public final GuiDropdownMenu<RenderSettings.AntiAliasing> antiAliasingDropdown = new GuiDropdownMenu<RenderSettings.AntiAliasing>()
+            .setSize(200, 20).setValues(RenderSettings.AntiAliasing.values()).setSelected(RenderSettings.AntiAliasing.NONE);
+
     public final GuiPanel advancedPanel = new GuiPanel().setLayout(new VerticalLayout().setSpacing(15))
             .addElements(null, nametagCheckbox, new GuiPanel().setLayout(
                     new GridLayout().setCellsEqualSize(false).setColumns(2).setSpacingX(5).setSpacingY(15))
                     .addElements(new GridLayout.Data(0, 0.5),
                             new GuiLabel().setI18nText("replaymod.gui.rendersettings.stabilizecamera"), stabilizePanel,
                             chromaKeyingCheckbox, chromaKeyingColor,
-                            inject360Metadata));
+                            inject360Metadata,
+                            new GuiLabel(), // to show the anti-aliasing options in a new line
+                            new GuiLabel().setI18nText("replaymod.gui.rendersettings.antialiasing"), antiAliasingDropdown));
 
     public final GuiTextField exportCommand = new GuiTextField().setI18nHint("replaymod.gui.rendersettings.command")
             .setSize(55, 20).setMaxLength(100);
@@ -347,8 +352,8 @@ public class GuiRenderSettings extends GuiScreen implements Closeable {
     public void load(RenderSettings settings) {
         renderMethodDropdown.setSelected(settings.getRenderMethod());
         encodingPresetDropdown.setSelected(settings.getEncodingPreset());
-        videoWidth.setValue(settings.getVideoWidth());
-        videoHeight.setValue(settings.getVideoHeight());
+        videoWidth.setValue(settings.getTargetVideoWidth());
+        videoHeight.setValue(settings.getTargetVideoHeight());
         frameRateSlider.setValue(settings.getFramesPerSecond() - 10);
         if (settings.getBitRate() % (1 << 20) == 0) {
             bitRateField.setValue(settings.getBitRate() >> 20);
@@ -380,6 +385,7 @@ public class GuiRenderSettings extends GuiScreen implements Closeable {
             chromaKeyingColor.setColor(settings.getChromaKeyingColor());
         }
         inject360Metadata.setChecked(settings.isInject360Metadata());
+        antiAliasingDropdown.setSelected(settings.getAntiAliasing());
         exportCommand.setText(settings.getExportCommand());
         exportArguments.setText(settings.getExportArguments());
 
@@ -401,6 +407,7 @@ public class GuiRenderSettings extends GuiScreen implements Closeable {
                 stabilizeRoll.isChecked() && (serialize || stabilizeRoll.isEnabled()),
                 chromaKeyingCheckbox.isChecked() ? chromaKeyingColor.getColor() : null,
                 inject360Metadata.isChecked() && (serialize || inject360Metadata.isEnabled()),
+                antiAliasingDropdown.getSelectedValue(),
                 exportCommand.getText(),
                 exportArguments.getText(),
                 net.minecraft.client.gui.GuiScreen.isCtrlKeyDown()
@@ -415,7 +422,7 @@ public class GuiRenderSettings extends GuiScreen implements Closeable {
 
     private RenderSettings getDefaultRenderSettings() {
         return new RenderSettings(RenderSettings.RenderMethod.DEFAULT, RenderSettings.EncodingPreset.MP4_DEFAULT, 1920, 1080, 60, 10 << 20, null,
-                true, false, false, false, null, false, "", RenderSettings.EncodingPreset.MP4_DEFAULT.getValue(), false);
+                true, false, false, false, null, false, RenderSettings.AntiAliasing.NONE, "", RenderSettings.EncodingPreset.MP4_DEFAULT.getValue(), false);
     }
 
     @Override