Changes

- Added a check to prevent attempt to launch 1.17+ with Java 8.
- Added an option to disable gl4es shaderconv in order to let ANGLE
processes them directly. This option lets Minecraft 1.17+ work
without the patch resource pack, OptiFine works aswell :)
- Changing renderer library no longer requires restart the launcher.
- Fixed some alert dialogs not displaying.
- PList default values are now set every time it loads.

JavaApp/src/main/java/net/kdt/pojavlaunch/Tools.java

@@ -79,6 +79,18 @@ public final class Tools
     public static final String LIBNAME_OPTIFINE = "optifine:OptiFine";
 
     public static void launchMinecraft(MinecraftAccount profile, final JMinecraftVersionList.Version versionInfo) throws Throwable {
+        String javaVersion = System.getProperty("java.version");
+        if (javaVersion.startsWith("1.")) {
+            javaVersion = javaVersion.substring(2);
+        }
+        int dotIndex = javaVersion.indexOf('.');
+        if (dotIndex != -1) {
+            javaVersion = javaVersion.substring(0, dotIndex);
+        }
+        if (versionInfo.javaVersion != null && versionInfo.javaVersion.majorVersion > Integer.parseInt(javaVersion)) {
+            throw new UnsupportedOperationException("Minecraft " + versionInfo.id + " requires Java " + versionInfo.javaVersion.majorVersion + " in order to run. Please switch to Java " + versionInfo.javaVersion.majorVersion + " in launcher settings.");
+        }
+
         String[] launchArgs = getMinecraftArgs(profile, versionInfo);
 
         // ctx.appendlnToLog("Minecraft Args: " + Arrays.toString(launchArgs));