[libgdx] Option to reset blend function.

spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/utils/SkeletonActor.java

@@ -30,18 +30,20 @@
 
 package com.esotericsoftware.spine.utils;
 
-import com.badlogic.gdx.graphics.Color;
-import com.badlogic.gdx.graphics.g2d.Batch;
-import com.badlogic.gdx.scenes.scene2d.Actor;
 import com.esotericsoftware.spine.AnimationState;
 import com.esotericsoftware.spine.Skeleton;
 import com.esotericsoftware.spine.SkeletonRenderer;
 
+import com.badlogic.gdx.graphics.Color;
+import com.badlogic.gdx.graphics.g2d.Batch;
+import com.badlogic.gdx.scenes.scene2d.Actor;
+
 /** A scene2d actor that draws a skeleton. */
 public class SkeletonActor extends Actor {
 	private SkeletonRenderer renderer;
 	private Skeleton skeleton;
 	AnimationState state;
+	private boolean resetBlendFunction = true;
 
 	/** Creates an uninitialized SkeletonActor. The renderer, skeleton, and animation state must be set before use. */
 	public SkeletonActor () {
@@ -61,6 +63,9 @@ public class SkeletonActor extends Actor {
 	}
 
 	public void draw (Batch batch, float parentAlpha) {
+		int blendSrc = batch.getBlendSrcFunc(), blendDst = batch.getBlendDstFunc();
+		int blendSrcAlpha = batch.getBlendSrcFuncAlpha(), blendDstAlpha = batch.getBlendDstFuncAlpha();
+
 		Color color = skeleton.getColor();
 		float oldAlpha = color.a;
 		skeleton.getColor().a *= parentAlpha;
@@ -68,6 +73,8 @@ public class SkeletonActor extends Actor {
 		skeleton.setPosition(getX(), getY());
 		renderer.draw(batch, skeleton);
 
+		if (resetBlendFunction) batch.setBlendFunctionSeparate(blendSrc, blendDst, blendSrcAlpha, blendDstAlpha);
+
 		color.a = oldAlpha;
 	}
 
@@ -94,4 +101,14 @@ public class SkeletonActor extends Actor {
 	public void setAnimationState (AnimationState state) {
 		this.state = state;
 	}
+
+	public boolean getResetBlendFunction () {
+		return resetBlendFunction;
+	}
+
+	/** If false, the blend function will be left as whatever {@link SkeletonRenderer#draw(Batch, Skeleton)} set. This can reduce
+	 * batch flushes in some cases, but means other rendering may need to first set the blend function. Default is true. */
+	public void setResetBlendFunction (boolean resetBlendFunction) {
+		this.resetBlendFunction = resetBlendFunction;
+	}
 }

spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/utils/SkeletonDrawable.java

@@ -30,18 +30,20 @@
 
 package com.esotericsoftware.spine.utils;
 
-import com.badlogic.gdx.graphics.g2d.Batch;
-import com.badlogic.gdx.scenes.scene2d.utils.BaseDrawable;
 import com.esotericsoftware.spine.AnimationState;
 import com.esotericsoftware.spine.Skeleton;
 import com.esotericsoftware.spine.SkeletonRenderer;
 
+import com.badlogic.gdx.graphics.g2d.Batch;
+import com.badlogic.gdx.scenes.scene2d.utils.BaseDrawable;
+
 /** A scene2d drawable that draws a skeleton. The animation state and skeleton must be updated each frame, or
  * {@link #update(float)} called each frame. */
 public class SkeletonDrawable extends BaseDrawable {
 	private SkeletonRenderer renderer;
 	private Skeleton skeleton;
 	AnimationState state;
+	private boolean resetBlendFunction = true;
 
 	/** Creates an uninitialized SkeletonDrawable. The renderer, skeleton, and animation state must be set before use. */
 	public SkeletonDrawable () {
@@ -59,9 +61,14 @@ public class SkeletonDrawable extends BaseDrawable {
 	}
 
 	public void draw (Batch batch, float x, float y, float width, float height) {
+		int blendSrc = batch.getBlendSrcFunc(), blendDst = batch.getBlendDstFunc();
+		int blendSrcAlpha = batch.getBlendSrcFuncAlpha(), blendDstAlpha = batch.getBlendDstFuncAlpha();
+
 		skeleton.setPosition(x, y);
 		skeleton.updateWorldTransform();
 		renderer.draw(batch, skeleton);
+
+		if (resetBlendFunction) batch.setBlendFunctionSeparate(blendSrc, blendDst, blendSrcAlpha, blendDstAlpha);
 	}
 
 	public SkeletonRenderer getRenderer () {
@@ -87,4 +94,14 @@ public class SkeletonDrawable extends BaseDrawable {
 	public void setAnimationState (AnimationState state) {
 		this.state = state;
 	}
+
+	public boolean getResetBlendFunction () {
+		return resetBlendFunction;
+	}
+
+	/** If false, the blend function will be left as whatever {@link SkeletonRenderer#draw(Batch, Skeleton)} set. This can reduce
+	 * batch flushes in some cases, but means other rendering may need to first set the blend function. Default is true. */
+	public void setResetBlendFunction (boolean resetBlendFunction) {
+		this.resetBlendFunction = resetBlendFunction;
+	}
 }