Attempt to fixing 1074 (#1093)

* Attempt to fixing 1074

* Added method implementations in GlRenderer

* Added test.

* Added test to jme-examples

* Some changes to resolve merge conficts

* Fixes

* Indent-fixes

* Documented the class and added stop()

* Fixed a minor error

* Fixed build gradles

* Removed line ending

jme3-core/src/main/java/com/jme3/renderer/Renderer.java

@@ -443,5 +443,18 @@ public interface Renderer {
      * @return true if the results of the task with the given task id are available.
      */
     public boolean isTaskResultAvailable(int taskId);
+    
+    
+    /**
+     * Gets the alpha to coverage state.
+     * 
+     */
+    public boolean getAlphaToCoverage(); 
+    
+    /**
+     * Get the default anisotropic filter level for textures.
+     *
+     */
+    public int getDefaultAnisotropicFilter();
 
 }

jme3-core/src/main/java/com/jme3/renderer/opengl/GLRenderer.java

@@ -3136,4 +3136,17 @@ public final class GLRenderer implements Renderer {
     public boolean isTaskResultAvailable(int taskId) {
         return gl.glGetQueryObjectiv(taskId, GL.GL_QUERY_RESULT_AVAILABLE) == 1;
     }
+    @Override
+    public boolean getAlphaToCoverage() {
+        if (caps.contains(Caps.Multisample)) {
+            return gl.glIsEnabled(GLExt.GL_SAMPLE_ALPHA_TO_COVERAGE_ARB);
+
+        }
+        return false;
+    }
+
+    @Override
+    public int getDefaultAnisotropicFilter() {
+        return this.defaultAnisotropicFilter;
+    }
 }

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

@@ -212,4 +212,14 @@ public class NullRenderer implements Renderer {
     @Override
     public void setDefaultAnisotropicFilter(int level) {
     }
+
+    @Override
+    public boolean getAlphaToCoverage() {
+        return false;
+    }
+
+    @Override
+    public int getDefaultAnisotropicFilter() {
+        return 0;
+    }
 }

jme3-examples/src/main/java/jme3test/renderer/TestAlphaToCoverage.java

@@ -0,0 +1,54 @@
+package jme3test.renderer;
+import com.jme3.app.SimpleApplication;
+
+import com.jme3.renderer.lwjgl.LwjglGL;
+import com.jme3.renderer.opengl.GL;
+import com.jme3.renderer.opengl.GLExt;
+import com.jme3.renderer.opengl.GLFbo;
+import com.jme3.renderer.opengl.GLRenderer;
+import com.jme3.renderer.lwjgl.LwjglGLExt;
+import com.jme3.renderer.lwjgl.LwjglGLFboEXT;
+import com.jme3.renderer.Caps;
+
+import java.util.EnumSet;
+
+/**
+ * Simple application to test the getter and setters of AlphaToCoverage and
+ * DefaultAnisotropicFilter from the GLRenderer class.
+ *
+ * Since the app doesn't display anything relevant a stop() has been added
+ * This starts and closes the app on a successful run
+ */
+public class TestAlphaToCoverage extends SimpleApplication {
+
+    public static void main(String[] args) {
+        new TestAlphaToCoverage().start();
+    }
+
+    public GL gl = new LwjglGL();
+    public GLExt glext = new LwjglGLExt();
+    public GLFbo glfbo = new LwjglGLFboEXT();
+    private GLRenderer glRenderer= new GLRenderer(gl,glext,glfbo);
+
+    public EnumSet<Caps> caps = glRenderer.getCaps();
+
+
+
+    @Override
+    public void simpleInitApp() {
+        glRenderer.setAlphaToCoverage(false);
+        assert !glRenderer.getAlphaToCoverage();
+
+        caps.add(Caps.Multisample);
+        glRenderer.setAlphaToCoverage(true);
+        assert glRenderer.getAlphaToCoverage();
+        glRenderer.setAlphaToCoverage(false);
+        assert !glRenderer.getAlphaToCoverage();
+
+        glRenderer.setDefaultAnisotropicFilter(1);
+        assert glRenderer.getDefaultAnisotropicFilter() == 1;
+
+        stop();
+    }
+
+}