Only enable Fullscreen Resolution option on Windows

Additionally, adjust the rendering of the controls
to be less confusing when disabled, and provide an
explanation as to what the option does.

common/src/main/java/net/caffeinemc/mods/sodium/client/gui/SodiumGameOptionPages.java

@@ -5,6 +5,7 @@
 import com.mojang.blaze3d.platform.Monitor;
 import com.mojang.blaze3d.platform.VideoMode;
 import com.mojang.blaze3d.platform.Window;
+import net.caffeinemc.mods.sodium.client.compatibility.environment.OsUtils;
 import net.caffeinemc.mods.sodium.client.gl.arena.staging.MappedStagingBuffer;
 import net.caffeinemc.mods.sodium.client.gl.device.RenderDevice;
 import net.caffeinemc.mods.sodium.client.gui.options.*;
@@ -94,7 +95,7 @@ public static OptionPage general() {
                         .build())
                 .add(OptionImpl.createBuilder(int.class, vanillaOpts)
                         .setName(Component.translatable("options.fullscreen.resolution"))
-                        .setTooltip(Component.translatable("options.fullscreen.resolution"))
+                        .setTooltip(Component.translatable("sodium.options.fullscreen_resolution.tooltip"))
                         .setControl(option -> new SliderControl(option, 0, null != monitor? monitor.getModeCount(): 0, 1, ControlValueFormatter.resolution()))
                         .setBinding((options, value) -> {
                             if (null != monitor) {
@@ -109,7 +110,7 @@ public static OptionPage general() {
                                 return optional.map((videoMode) -> monitor.getVideoModeIndex(videoMode) + 1).orElse(0);
                             }
                         })
-                        .setImpact(OptionImpact.HIGH)
+                        .setEnabled(() -> OsUtils.getOs() == OsUtils.OperatingSystem.WIN && Minecraft.getInstance().getWindow().findBestMonitor() != null)
                         .setFlags(OptionFlag.REQUIRES_VIDEOMODE_RELOAD)
                         .build())
                 .add(OptionImpl.createBuilder(boolean.class, vanillaOpts)

common/src/main/java/net/caffeinemc/mods/sodium/client/gui/options/control/ControlValueFormatter.java

@@ -1,6 +1,7 @@
 package net.caffeinemc.mods.sodium.client.gui.options.control;
 
 import com.mojang.blaze3d.platform.Monitor;
+import net.caffeinemc.mods.sodium.client.compatibility.environment.OsUtils;
 import net.minecraft.client.Minecraft;
 import net.minecraft.network.chat.Component;
 
@@ -10,9 +11,10 @@ static ControlValueFormatter guiScale() {
     }
 
     static ControlValueFormatter resolution() {
-        Monitor monitor = Minecraft.getInstance().getWindow().findBestMonitor();
         return (v) -> {
-            if (null == monitor) {
+            Monitor monitor = Minecraft.getInstance().getWindow().findBestMonitor();
+
+            if (OsUtils.getOs() != OsUtils.OperatingSystem.WIN || monitor == null) {
                 return Component.translatable("options.fullscreen.unavailable");
             } else if (0 == v) {
                 return Component.translatable("options.fullscreen.current");

common/src/main/java/net/caffeinemc/mods/sodium/client/gui/options/control/SliderControl.java

@@ -3,9 +3,10 @@
 import com.mojang.blaze3d.platform.InputConstants;
 import net.caffeinemc.mods.sodium.client.gui.options.Option;
 import net.caffeinemc.mods.sodium.client.util.Dim2i;
+import net.minecraft.ChatFormatting;
 import net.minecraft.client.gui.GuiGraphics;
 import net.minecraft.client.renderer.Rect2i;
-import net.minecraft.network.chat.Component;
+import net.minecraft.network.chat.Style;
 import net.minecraft.util.Mth;
 import org.apache.commons.lang3.Validate;
 
@@ -81,7 +82,15 @@ public void render(GuiGraphics graphics, int mouseX, int mouseY, float delta) {
             int sliderWidth = this.sliderBounds.getWidth();
             int sliderHeight = this.sliderBounds.getHeight();
 
-            Component label = this.formatter.format(this.option.getValue());
+            var label = this.formatter.format(this.option.getValue())
+                    .copy();
+
+            if (!this.option.isAvailable()) {
+                label.setStyle(Style.EMPTY
+                        .withColor(ChatFormatting.GRAY)
+                        .withItalic(true));
+            }
+
             int labelWidth = this.font.width(label);
 
             boolean drawSlider = this.option.isAvailable() && (this.hovered || this.isFocused());

common/src/main/resources/assets/sodium/lang/en_us.json

@@ -12,6 +12,7 @@
   "sodium.options.brightness.tooltip": "Controls the minimum brightness in the world. When increased, darker areas of the world will appear brighter. This does not affect the brightness of already well-lit areas.",
   "sodium.options.gui_scale.tooltip": "Sets the maximum scale factor to be used for the user interface. If \"auto\" is used, then the largest scale factor will always be used.",
   "sodium.options.fullscreen.tooltip": "If enabled, the game will display in full-screen (if supported).",
+  "sodium.options.fullscreen_resolution.tooltip": "The monitor resolution and refresh rate to be used when in fullscreen mode. Changing this option may interfere with other applications and cause a delay when switching between applications.\n\nThis is only supported on the Windows operating system.",
   "sodium.options.v_sync.tooltip": "If enabled, the game's frame rate will be synchronized to the monitor's refresh rate, making for a generally smoother experience at the expense of overall input latency. This setting might reduce performance if your system is too slow.",
   "sodium.options.fps_limit.tooltip": "Limits the maximum number of frames per second. This can help reduce battery usage and system load when multi-tasking. If VSync is enabled, this option will be ignored unless it is lower than your display's refresh rate.",
   "sodium.options.view_bobbing.tooltip": "If enabled, the player's view will sway and bob when moving around. Players who experience motion sickness while playing may benefit from disabling this.",