Avoid glTexParameter calls if not neccessary by storing last texture state in the Image object

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

@@ -1799,10 +1799,16 @@ public class GLRenderer implements Renderer {
         }
         
         // filter things
-        int minFilter = convertMinFilter(tex.getMinFilter(), haveMips);
+        if (image.getLastTextureState().magFilter != tex.getMagFilter()) {
             int magFilter = convertMagFilter(tex.getMagFilter());
-        gl.glTexParameteri(target, GL.GL_TEXTURE_MIN_FILTER, minFilter);
             gl.glTexParameteri(target, GL.GL_TEXTURE_MAG_FILTER, magFilter);
+            image.getLastTextureState().magFilter = tex.getMagFilter();
+        }
+        if (image.getLastTextureState().minFilter != tex.getMinFilter()) {
+            int minFilter = convertMinFilter(tex.getMinFilter(), haveMips);
+            gl.glTexParameteri(target, GL.GL_TEXTURE_MIN_FILTER, minFilter);
+            image.getLastTextureState().minFilter = tex.getMinFilter();
+        }
         
         if (tex.getAnisotropicFilter() > 1) {
             if (caps.contains(Caps.TextureFilterAnisotropic)) {
@@ -1820,16 +1826,21 @@ public class GLRenderer implements Renderer {
         switch (tex.getType()) {
             case ThreeDimensional:
             case CubeMap: // cubemaps use 3D coords
-                if (gl2 != null) {
+                if (gl2 != null && image.getLastTextureState().rWrap != tex.getWrap(WrapAxis.R)) {
                     gl2.glTexParameteri(target, GL2.GL_TEXTURE_WRAP_R, convertWrapMode(tex.getWrap(WrapAxis.R)));
+                    image.getLastTextureState().rWrap = tex.getWrap(WrapAxis.R);
                 }
                 //There is no break statement on purpose here
             case TwoDimensional:
             case TwoDimensionalArray:
+                if (image.getLastTextureState().tWrap != tex.getWrap(WrapAxis.T)) {
                     gl.glTexParameteri(target, GL.GL_TEXTURE_WRAP_T, convertWrapMode(tex.getWrap(WrapAxis.T)));
-                // fall down here is intentional..
+                    image.getLastTextureState().tWrap = tex.getWrap(WrapAxis.T);
-//            case OneDimensional:
+                }
+                if (image.getLastTextureState().sWrap != tex.getWrap(WrapAxis.S)) {
                     gl.glTexParameteri(target, GL.GL_TEXTURE_WRAP_S, convertWrapMode(tex.getWrap(WrapAxis.S)));
+                    image.getLastTextureState().sWrap = tex.getWrap(WrapAxis.S);
+                }
                 break;
             default:
                 throw new UnsupportedOperationException("Unknown texture type: " + tex.getType());

jme3-core/src/main/java/com/jme3/texture/Image.java

@@ -40,6 +40,7 @@ import com.jme3.math.FastMath;
 import com.jme3.renderer.Caps;
 import com.jme3.renderer.Renderer;
 import com.jme3.texture.image.ColorSpace;
+import com.jme3.texture.image.LastTextureState;
 import com.jme3.util.BufferUtils;
 import com.jme3.util.NativeObject;
 import java.io.IOException;
@@ -374,6 +375,18 @@ public class Image extends NativeObject implements Savable /*, Cloneable*/ {
     // attributes relating to GL object
     protected boolean mipsWereGenerated = false;
     protected boolean needGeneratedMips = false;
+    protected final LastTextureState lastTextureState = new LastTextureState();
+
+    /**
+     * Internal use only.
+     * The renderer stores the texture state set from the last texture
+     * so it doesn't have to change it unless necessary. 
+     * 
+     * @return The image parameter state.
+     */
+    public LastTextureState getLastTextureState() {
+        return lastTextureState;
+    }
     
     /**
      * Internal use only. 
@@ -429,6 +442,7 @@ public class Image extends NativeObject implements Savable /*, Cloneable*/ {
     public void resetObject() {
         this.id = -1;
         this.mipsWereGenerated = false;
+        this.lastTextureState.reset();
         setUpdateNeeded();
     }
 

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

@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2009-2015 jMonkeyEngine
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
+ *   may be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package com.jme3.texture.image;
+
+import com.jme3.renderer.Renderer;
+import com.jme3.texture.Texture;
+
+/**
+ * Stores / caches texture state parameters so they don't have to be set 
+ * each time by the {@link Renderer}.
+ * 
+ * @author Kirill Vainer
+ */
+public final class LastTextureState {
+    
+    public Texture.WrapMode sWrap, tWrap, rWrap;
+    public Texture.MagFilter magFilter;
+    public Texture.MinFilter minFilter;
+    
+    public LastTextureState() {
+        // All parameters initialized to null (meaning unset).
+    }
+    
+    public void reset() {
+        sWrap = null;
+        tWrap = null;
+        rWrap = null;
+        magFilter = null;
+        minFilter = null;
+    }
+}