Renderer: add setDefaultAnisotropicFilter

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

@@ -311,6 +311,20 @@ public interface Renderer {
      */
     public void cleanup();
 
+    /**
+     * Set the default anisotropic filter level for textures.
+     *
+     * If the
+     * {@link Texture#setAnisotropicFilter(int) texture anisotropic filter} is
+     * set to 0, then the default level is used. Otherwise if the texture level
+     * is 1 or greater, then the texture's value overrides the default value.
+     *
+     * @param level The default anisotropic filter level to use. Default: 1.
+     *
+     * @throws IllegalArgumentException If level is less than 1.
+     */
+    public void setDefaultAnisotropicFilter(int level);
+
     /**
      * Sets the alpha to coverage state.
      * <p>

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

@@ -90,6 +90,7 @@ public final class GLRenderer implements Renderer {
     private final Statistics statistics = new Statistics();
     private int vpX, vpY, vpW, vpH;
     private int clipX, clipY, clipW, clipH;
+    private int defaultAnisotropicFilter = 1;
     private boolean linearizeSrgbImages;
     private HashSet<String> extensions;
 
@@ -600,6 +601,14 @@ public final class GLRenderer implements Renderer {
         }
     }
 
+    @Override
+    public void setDefaultAnisotropicFilter(int level) {
+        if (level < 1) {
+            throw new IllegalArgumentException("level cannot be less than 1");
+        }
+        this.defaultAnisotropicFilter = level;
+    }
+
     public void setAlphaToCoverage(boolean value) {
         if (caps.contains(Caps.Multisample)) {
             if (value) {
@@ -1878,13 +1887,18 @@ public final class GLRenderer implements Renderer {
             gl.glTexParameteri(target, GL.GL_TEXTURE_MIN_FILTER, convertMinFilter(tex.getMinFilter(), haveMips));
             curState.minFilter = tex.getMinFilter();
         }
+
+        int desiredAnisoFilter = tex.getAnisotropicFilter() == 0
+                ? defaultAnisotropicFilter
+                : tex.getAnisotropicFilter();
+
         if (caps.contains(Caps.TextureFilterAnisotropic)
-                && curState.anisoFilter != tex.getAnisotropicFilter()) {
+                && curState.anisoFilter != desiredAnisoFilter) {
             bindTextureAndUnit(target, image, unit);
             gl.glTexParameterf(target,
                     GLExt.GL_TEXTURE_MAX_ANISOTROPY_EXT,
-                    tex.getAnisotropicFilter());
-            curState.anisoFilter = tex.getAnisotropicFilter();
+                    desiredAnisoFilter);
+            curState.anisoFilter = desiredAnisoFilter;
         }
 
         switch (tex.getType()) {

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

@@ -175,4 +175,7 @@ public class NullRenderer implements Renderer {
     public void readFrameBufferWithFormat(FrameBuffer fb, ByteBuffer byteBuf, Image.Format format) {        
     }
 
+    @Override
+    public void setDefaultAnisotropicFilter(int level) {
+    }
 }

jme3-core/src/main/java/com/jme3/texture/image/LastTextureState.java

@@ -58,7 +58,7 @@ public final class LastTextureState {
         rWrap = null;
         magFilter = null;
         minFilter = null;
-        anisoFilter = 0;
+        anisoFilter = 1;
         
         // The default in OpenGL is OFF, so we avoid setting this per texture
         // if its not used.