Made a ComposeFilter that allows one to compose post filtered outputs from multiple viewports

see http://jmonkeyengine.org/forum/topic/bloom-filter-for-multiple-nodes/#post-213016

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@10592 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/core-effects/Common/MatDefs/Post/Compose.frag

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+uniform sampler2D m_Texture;
+uniform sampler2D m_CompositeTexture;
+varying vec2 texCoord;
+
+void main() {
+      vec4 texVal = texture2D(m_Texture, texCoord);
+      vec4 compositeVal = texture2D(m_CompositeTexture, texCoord);
+      gl_FragColor = mix(compositeVal,texVal,texVal.a);
+}
+

engine/src/core-effects/Common/MatDefs/Post/Compose.j3md

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+MaterialDef Default GUI {
+
+    MaterialParameters {
+        Int NumSamples
+        Int NumSamplesDepth
+        Texture2D Texture
+        Texture2D CompositeTexture
+    }
+
+    Technique {
+        VertexShader GLSL150:   Common/MatDefs/Post/Post15.vert
+        FragmentShader GLSL150: Common/MatDefs/Post/Compose15.frag
+
+        WorldParameters {
+            WorldViewProjectionMatrix
+        }
+
+        Defines {
+            RESOLVE_MS : NumSamples
+        }
+
+    }
+
+    Technique {
+        VertexShader GLSL100:   Common/MatDefs/Post/Post.vert
+        FragmentShader GLSL100: Common/MatDefs/Post/Compose.frag
+
+        WorldParameters {
+            WorldViewProjectionMatrix
+        }
+
+    }
+}

engine/src/core-effects/Common/MatDefs/Post/Compose15.frag

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+#import "Common/ShaderLib/MultiSample.glsllib"
+
+uniform COLORTEXTURE m_Texture;
+uniform COLORTEXTURE m_CompositeTexture;
+in vec2 texCoord;
+
+out vec4 finalColor;
+
+void main() {
+      vec4 texVal = getColor(m_Texture, texCoord);
+      vec4 compositeVal = getColor(m_CompositeTexture, texCoord);
+      finalColor = mix(compositeVal,texVal,texVal.a);      
+}
+

engine/src/core-effects/com/jme3/post/filters/ComposeFilter.java

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+/*
+ * Copyright (c) 2009-2012 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.post.filters;
+
+import com.jme3.asset.AssetManager;
+import com.jme3.export.InputCapsule;
+import com.jme3.export.JmeExporter;
+import com.jme3.export.JmeImporter;
+import com.jme3.export.OutputCapsule;
+import com.jme3.material.Material;
+import com.jme3.post.Filter;
+import com.jme3.renderer.RenderManager;
+import com.jme3.renderer.ViewPort;
+import com.jme3.texture.Texture2D;
+import java.io.IOException;
+
+/**
+ * This filter compose a texture with the viewport texture. This is used to
+ * compose post processed texture from another viewport.
+ *
+ * the compositing is done using the alpha value of the viewportTexture :
+ * mix(compositeTextureColor, viewPortColor, viewportColor.alpha);
+ *
+ * It's important for a good result that the viewport clear color alpha be 0.
+ *
+ * @author Rémy Bouquet aka Nehon
+ */
+public class ComposeFilter extends Filter {
+
+    private Texture2D compositeTexture;
+
+    /**
+     * creates a ComposeFilter
+     */
+    public ComposeFilter() {
+        super("Compose Filter");
+    }
+
+    /**
+     * creates a ComposeFilter with the given texture
+     *
+     * @param color
+     */
+    public ComposeFilter(Texture2D compositeTexture) {
+        this();
+        this.compositeTexture = compositeTexture;
+    }
+
+    @Override
+    protected Material getMaterial() {
+
+        material.setTexture("CompositeTexture", compositeTexture);
+        return material;
+    }
+
+    /**
+     *
+     * @return the compositeTexture
+     */
+    public Texture2D getCompositeTexture() {
+        return compositeTexture;
+    }
+
+    /**
+     * sets the compositeTexture
+     *
+     * @param compositeTexture
+     */
+    public void setCompositeTexture(Texture2D compositeTexture) {
+        this.compositeTexture = compositeTexture;
+    }
+
+    @Override
+    protected void initFilter(AssetManager manager, RenderManager renderManager, ViewPort vp, int w, int h) {
+        material = new Material(manager, "Common/MatDefs/Post/Compose.j3md");
+    }
+
+    @Override
+    public void write(JmeExporter ex) throws IOException {
+        super.write(ex);
+        OutputCapsule oc = ex.getCapsule(this);
+    }
+
+    @Override
+    public void read(JmeImporter im) throws IOException {
+        super.read(im);
+        InputCapsule ic = im.getCapsule(this);
+    }
+}

engine/src/test/jme3test/post/TestPostFiltersCompositing.java

@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 2009-2012 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 jme3test.post;
+
+import com.jme3.app.SimpleApplication;
+import com.jme3.asset.plugins.ZipLocator;
+import com.jme3.light.DirectionalLight;
+import com.jme3.math.ColorRGBA;
+import com.jme3.math.Quaternion;
+import com.jme3.math.Vector3f;
+import com.jme3.post.FilterPostProcessor;
+import com.jme3.post.filters.BloomFilter;
+import com.jme3.post.filters.ColorOverlayFilter;
+import com.jme3.post.filters.ComposeFilter;
+import com.jme3.scene.Spatial;
+import com.jme3.texture.FrameBuffer;
+import com.jme3.texture.Image;
+import com.jme3.texture.Texture2D;
+import com.jme3.util.SkyFactory;
+
+/**
+ * This test showcases the possibility to compose the post filtered outputs of several viewports.
+ * The usual use case is when you want to apply some post process to the main viewport and then other post process to the gui viewport
+ * @author Nehon
+ */
+public class TestPostFiltersCompositing extends SimpleApplication {
+
+    public static void main(String[] args) {
+        TestPostFiltersCompositing app = new TestPostFiltersCompositing();
+        app.start();
+    }
+
+    public void simpleInitApp() {
+        this.flyCam.setMoveSpeed(10);
+        cam.setLocation(new Vector3f(6.0344796f, 1.5054002f, 55.572033f));
+        cam.setRotation(new Quaternion(0.0016069f, 0.9810479f, -0.008143323f, 0.19358753f));
+
+        makeScene();
+
+        //Creating the main view port post processor
+        FilterPostProcessor fpp = new FilterPostProcessor(assetManager);
+        fpp.addFilter(new ColorOverlayFilter(ColorRGBA.Blue));
+        viewPort.addProcessor(fpp);
+
+        //creating a frame buffer for the mainviewport
+        FrameBuffer mainVPFrameBuffer = new FrameBuffer(cam.getWidth(), cam.getHeight(), 1);
+        Texture2D mainVPTexture = new Texture2D(cam.getWidth(), cam.getHeight(), Image.Format.RGBA8);
+        mainVPFrameBuffer.addColorTexture(mainVPTexture);
+        mainVPFrameBuffer.setDepthBuffer(Image.Format.Depth);
+        viewPort.setOutputFrameBuffer(mainVPFrameBuffer);
+
+        //creating the post processor for the gui viewport
+        final FilterPostProcessor guifpp = new FilterPostProcessor(assetManager);           
+        guifpp.addFilter(new ColorOverlayFilter(ColorRGBA.Red));       
+        //this will compose the main viewport texture with the guiviewport back buffer.
+        //Note that you can swich the order of the filters so that guiviewport filters are applied or not to the main viewport texture    
+        guifpp.addFilter(new ComposeFilter(mainVPTexture));
+        
+        guiViewPort.addProcessor(guifpp);
+        
+        //compositing is done my mixing texture depending on the alpha channel, 
+        //it's important that the guiviewport clear color alpha value is set to 0
+        guiViewPort.setBackgroundColor(new ColorRGBA(0, 0, 0, 0));
+
+
+    }
+
+    private void makeScene() {
+        // load sky
+        rootNode.attachChild(SkyFactory.createSky(assetManager, "Textures/Sky/Bright/BrightSky.dds", false));
+        assetManager.registerLocator("wildhouse.zip", ZipLocator.class);
+        Spatial scene = assetManager.loadModel("main.scene");
+        DirectionalLight sun = new DirectionalLight();
+        sun.setDirection(new Vector3f(-0.4790551f, -0.39247334f, -0.7851566f));
+        sun.setColor(ColorRGBA.White.clone().multLocal(2));
+        scene.addLight(sun);
+        rootNode.attachChild(scene);
+    }
+}