From 5a482e2b987d41c7dff782917c0168e4b421b79d Mon Sep 17 00:00:00 2001
From: pspeed42 <pspeed42@gmail.com>
Date: Wed, 10 Sep 2014 14:00:27 -0400
Subject: [PATCH] Added another Photoshop tyle blend mode: Exclusion Performs a
 sort of color XOR with source and destination. Very useful for UI
 highlighting but is a bizarre (and potentially useful) effect in 3D.

---
 .../com/jme3/renderer/android/OGLESShaderRenderer.java |  3 +++
 .../src/main/java/com/jme3/material/RenderState.java   | 10 +++++++++-
 .../main/java/com/jme3/renderer/jogl/JoglRenderer.java |  3 +++
 .../java/com/jme3/renderer/lwjgl/LwjglRenderer.java    |  3 +++
 4 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/jme3-android/src/main/java/com/jme3/renderer/android/OGLESShaderRenderer.java b/jme3-android/src/main/java/com/jme3/renderer/android/OGLESShaderRenderer.java
index 5b3e829c1..4c22c2520 100644
--- a/jme3-android/src/main/java/com/jme3/renderer/android/OGLESShaderRenderer.java
+++ b/jme3-android/src/main/java/com/jme3/renderer/android/OGLESShaderRenderer.java
@@ -559,6 +559,9 @@ public class OGLESShaderRenderer implements Renderer {
                     case Screen:
                         GLES20.glBlendFunc(GLES20.GL_ONE, GLES20.GL_ONE_MINUS_SRC_COLOR);
                         break; 
+                    case Exclusion:
+                        GLES20.glBlendFunc(GLES20.GL_ONE_MINUS_DST_COLOR, GLES20.GL_ONE_MINUS_SRC_COLOR);
+                        break;
                     default:
                         throw new UnsupportedOperationException("Unrecognized blend mode: "
                                 + state.getBlendMode());
diff --git a/jme3-core/src/main/java/com/jme3/material/RenderState.java b/jme3-core/src/main/java/com/jme3/material/RenderState.java
index 2cea1c8e6..9359ce7f4 100644
--- a/jme3-core/src/main/java/com/jme3/material/RenderState.java
+++ b/jme3-core/src/main/java/com/jme3/material/RenderState.java
@@ -183,7 +183,15 @@ public class RenderState implements Cloneable, Savable {
          * <p>
          * Result = 1 - (1 - Source Color) * (1 - Dest Color) -> (GL_ONE, GL_ONE_MINUS_SRC_COLOR)
          */
-        Screen
+        Screen,
+        /**
+         * Mixes the destination and source colors similar to a color-based XOR
+         * operation.  This is directly equivalent to Photoshop's "Exclusion" blend.
+         * <p>
+         * Result = (Source Color * (1 - Dest Color)) + (Dest Color * (1 - Source Color))
+         *  -> (GL_ONE_MINUS_DST_COLOR, GL_ONE_MINUS_SRC_COLOR) 
+         */
+        Exclusion
     }
 
     /**
diff --git a/jme3-jogl/src/main/java/com/jme3/renderer/jogl/JoglRenderer.java b/jme3-jogl/src/main/java/com/jme3/renderer/jogl/JoglRenderer.java
index 1df80f66a..78c090e05 100644
--- a/jme3-jogl/src/main/java/com/jme3/renderer/jogl/JoglRenderer.java
+++ b/jme3-jogl/src/main/java/com/jme3/renderer/jogl/JoglRenderer.java
@@ -701,6 +701,9 @@ public class JoglRenderer implements Renderer {
                     case Screen:
                         gl.glBlendFunc(GL.GL_ONE, GL.GL_ONE_MINUS_SRC_COLOR);
                         break; 
+                    case Exclusion:
+                        gl.glBlendFunc(GL.GL_ONE_MINUS_DST_COLOR, GL.GL_ONE_MINUS_SRC_COLOR);
+                        break;
                     default:
                         throw new UnsupportedOperationException("Unrecognized blend mode: "
                                 + state.getBlendMode());
diff --git a/jme3-lwjgl/src/main/java/com/jme3/renderer/lwjgl/LwjglRenderer.java b/jme3-lwjgl/src/main/java/com/jme3/renderer/lwjgl/LwjglRenderer.java
index c30c706f4..fdc908347 100644
--- a/jme3-lwjgl/src/main/java/com/jme3/renderer/lwjgl/LwjglRenderer.java
+++ b/jme3-lwjgl/src/main/java/com/jme3/renderer/lwjgl/LwjglRenderer.java
@@ -650,6 +650,9 @@ public class LwjglRenderer implements Renderer {
                     case Screen:
                         glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_COLOR);
                         break;       
+                    case Exclusion:
+                        glBlendFunc(GL_ONE_MINUS_DST_COLOR, GL_ONE_MINUS_SRC_COLOR);
+                        break;
                     default:
                         throw new UnsupportedOperationException("Unrecognized blend mode: "
                                 + state.getBlendMode());