Fixes jMonkeyEngine#1251 - Support OpenGL3.1 on LWJGL2 and LWJGL3

Author: MeFisto94

jme3-core/src/main/java/com/jme3/system/AppSettings.java

@@ -70,6 +70,23 @@ public final class AppSettings extends HashMap<String, Object> {
      */
     public static final String LWJGL_OPENGL2 = "LWJGL-OpenGL2";
 
+    /**
+     * Use LWJGL as the display system and force using the core OpenGL3.2 renderer.
+     * <p>
+     * If the underlying system does not support OpenGL3.2, then the context
+     * initialization will throw an exception. Note that currently jMonkeyEngine
+     * does not have any shaders that support OpenGL3.2 therefore this
+     * option is not useful.
+     * <p>
+     * Note: OpenGL 3.2 is used to give 3.x support to Mac users.
+     *
+     * @deprecated Previously meant 3.2, use LWJGL_OPENGL32 or LWJGL_OPENGL30
+     * @see AppSettings#setRenderer(java.lang.String)
+     */
+    @Deprecated
+    public static final String LWJGL_OPENGL3 = "LWJGL-OpenGL3";
+
+
     /**
      * Use LWJGL as the display system and force using the core OpenGL3.0 renderer.
      * <p>
@@ -84,20 +101,17 @@ public final class AppSettings extends HashMap<String, Object> {
     public static final String LWJGL_OPENGL30 = "LWJGL-OpenGL30";
 
     /**
-     * Use LWJGL as the display system and force using the core OpenGL3.2 renderer.
+     * Use LWJGL as the display system and force using the core OpenGL3.1 renderer.
      * <p>
-     * If the underlying system does not support OpenGL3.2, then the context
+     * If the underlying system does not support OpenGL3.1, then the context
      * initialization will throw an exception. Note that currently jMonkeyEngine
-     * does not have any shaders that support OpenGL3.2 therefore this
+     * does not have any shaders that support OpenGL3.0 therefore this
      * option is not useful.
      * <p>
-     * Note: OpenGL 3.2 is used to give 3.x support to Mac users.
      *
-     * @deprecated Previously meant 3.2, use LWJGL_OPENGL32 or LWJGL_OPENGL30
      * @see AppSettings#setRenderer(java.lang.String)
      */
-    @Deprecated
-    public static final String LWJGL_OPENGL3 = "LWJGL-OpenGL3";
+    public static final String LWJGL_OPENGL31 = "LWJGL-OpenGL31";
 
     /**
      * Use LWJGL as the display system and force using the core OpenGL3.2 renderer.

jme3-lwjgl/src/main/java/com/jme3/system/lwjgl/LwjglContext.java

@@ -117,6 +117,10 @@ protected int[] getGLVersion(String renderer) {
                 maj = 3;
                 min = 0;
                 break;
+            case AppSettings.LWJGL_OPENGL31:
+                maj = 3;
+                min = 1;
+                break;
             case AppSettings.LWJGL_OPENGL32:
                 maj = 3;
                 min = 2;

jme3-lwjgl3/src/main/java/com/jme3/system/lwjgl/LwjglContext.java

@@ -106,6 +106,7 @@ public abstract class LwjglContext implements JmeContext {
     private static final Set<String> SUPPORTED_RENDERS = new HashSet<>(Arrays.asList(
             AppSettings.LWJGL_OPENGL2,
             AppSettings.LWJGL_OPENGL30,
+            AppSettings.LWJGL_OPENGL31,
             AppSettings.LWJGL_OPENGL32,
             AppSettings.LWJGL_OPENGL33,
             AppSettings.LWJGL_OPENGL40,

jme3-lwjgl3/src/main/java/com/jme3/system/lwjgl/LwjglWindow.java

@@ -80,6 +80,10 @@ public abstract class LwjglWindow extends LwjglContext implements Runnable {
             glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
             glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
         });
+        RENDER_CONFIGS.put(AppSettings.LWJGL_OPENGL31, () -> {
+            glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+            glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 1);
+        });
         RENDER_CONFIGS.put(AppSettings.LWJGL_OPENGL32, () -> {
             glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
             glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);