Particle Emitter :

- fixed setNumParticle method to correctly update the mesh buffers
- added a getMaxNumParticle that returns the max number of particles of the emitter
- changed testMovingParticles and testPointSprite to change the numParticle when hitting the space bar

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@7939 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/core/com/jme3/effect/ParticleEmitter.java

@@ -75,7 +75,6 @@ public class ParticleEmitter extends Geometry {
 
     private static final EmitterShape DEFAULT_SHAPE = new EmitterPointShape(Vector3f.ZERO);
     private static final ParticleInfluencer DEFAULT_INFLUENCER = new DefaultParticleInfluencer();
-    
     private ParticleEmitterControl control;
     private EmitterShape shape = DEFAULT_SHAPE;
     private ParticleMesh particleMesh;
@@ -201,7 +200,7 @@ public class ParticleEmitter extends Geometry {
 
         meshType = type;
 
-        this.setNumParticles(numParticles);
+
 
         // Must create clone of shape/influencer so that a reference to a static is 
         // not maintained
@@ -223,7 +222,8 @@ public class ParticleEmitter extends Geometry {
             default:
                 throw new IllegalStateException("Unrecognized particle type: " + meshType);
         }
-        particleMesh.initParticleData(this, particles.length);
+        this.setNumParticles(numParticles);
+//        particleMesh.initParticleData(this, particles.length);
     }
 
     /**
@@ -330,10 +330,17 @@ public class ParticleEmitter extends Geometry {
         for (int i = 0; i < numParticles; i++) {
             particles[i] = new Particle();
         }
+        //We have to reinit the mesh's buffers with the new size
+        particleMesh.initParticleData(this, particles.length);        
+        particleMesh.setImagesXY(this.imagesX, this.imagesY);
         firstUnUsed = 0;
         lastUsed = -1;
     }
 
+    public int getMaxNumParticles() {
+        return particles.length;
+    }
+
     /**
      * Returns a list of all particles (shouldn't be used in most cases).
      * 

engine/src/core/com/jme3/effect/ParticlePointMesh.java

@@ -64,27 +64,52 @@ public class ParticlePointMesh extends ParticleMesh {
         FloatBuffer pb = BufferUtils.createVector3Buffer(numParticles);
         VertexBuffer pvb = new VertexBuffer(VertexBuffer.Type.Position);
         pvb.setupData(Usage.Stream, 3, Format.Float, pb);
+         
+        //if the buffer is already set only update the data
+        VertexBuffer buf = getBuffer(VertexBuffer.Type.Position);
+        if (buf != null) {
+            buf.updateData(pb);
+        } else {
             setBuffer(pvb);
+        }
 
         // set colors
         ByteBuffer cb = BufferUtils.createByteBuffer(numParticles * 4);
         VertexBuffer cvb = new VertexBuffer(VertexBuffer.Type.Color);
         cvb.setupData(Usage.Stream, 4, Format.UnsignedByte, cb);
         cvb.setNormalized(true);
+        
+        buf = getBuffer(VertexBuffer.Type.Color);
+        if (buf != null) {
+            buf.updateData(cb);
+        } else {
             setBuffer(cvb);
+        }
 
         // set sizes
         FloatBuffer sb = BufferUtils.createFloatBuffer(numParticles);
         VertexBuffer svb = new VertexBuffer(VertexBuffer.Type.Size);
         svb.setupData(Usage.Stream, 1, Format.Float, sb);
+                
+        buf = getBuffer(VertexBuffer.Type.Size);
+        if (buf != null) {
+            buf.updateData(sb);
+        } else {
             setBuffer(svb);
+        }
 
         // set UV-scale
         FloatBuffer tb = BufferUtils.createFloatBuffer(numParticles*4);
         VertexBuffer tvb = new VertexBuffer(VertexBuffer.Type.TexCoord);
         tvb.setupData(Usage.Stream, 4, Format.Float, tb);
+        
+        buf = getBuffer(VertexBuffer.Type.TexCoord);
+        if (buf != null) {
+            buf.updateData(tb);
+        } else {
             setBuffer(tvb);
         }
+    }
 
     @Override
     public void updateParticleData(Particle[] particles, Camera cam, Matrix3f inverseRotation) {

engine/src/core/com/jme3/effect/ParticleTriMesh.java

@@ -66,14 +66,27 @@ public class ParticleTriMesh extends ParticleMesh {
         FloatBuffer pb = BufferUtils.createVector3Buffer(numParticles * 4);
         VertexBuffer pvb = new VertexBuffer(VertexBuffer.Type.Position);
         pvb.setupData(Usage.Stream, 3, Format.Float, pb);
+        
+        //if the buffer is already set only update the data
+        VertexBuffer buf = getBuffer(VertexBuffer.Type.Position);
+        if (buf != null) {
+            buf.updateData(pb);
+        } else {
             setBuffer(pvb);
+        }
         
         // set colors
         ByteBuffer cb = BufferUtils.createByteBuffer(numParticles * 4 * 4);
         VertexBuffer cvb = new VertexBuffer(VertexBuffer.Type.Color);
         cvb.setupData(Usage.Stream, 4, Format.UnsignedByte, cb);
         cvb.setNormalized(true);
+        
+        buf = getBuffer(VertexBuffer.Type.Color);
+        if (buf != null) {
+            buf.updateData(cb);
+        } else {
             setBuffer(cvb);
+        }
 
         // set texcoords
         VertexBuffer tvb = new VertexBuffer(VertexBuffer.Type.TexCoord);
@@ -89,7 +102,12 @@ public class ParticleTriMesh extends ParticleMesh {
         tb.flip();
         tvb.setupData(Usage.Static, 2, Format.Float, tb);
         
+        buf = getBuffer(VertexBuffer.Type.TexCoord);
+        if (buf != null) {
+            buf.updateData(tb);
+        } else {
             setBuffer(tvb);
+        }
 
         // set indices
         ShortBuffer ib = BufferUtils.createShortBuffer(numParticles * 6);
@@ -110,9 +128,16 @@ public class ParticleTriMesh extends ParticleMesh {
         
         VertexBuffer ivb = new VertexBuffer(VertexBuffer.Type.Index);
         ivb.setupData(Usage.Static, 3, Format.UnsignedShort, ib);
+        
+        buf = getBuffer(VertexBuffer.Type.Index);
+        if (buf != null) {
+            buf.updateData(ib);
+        } else {
             setBuffer(ivb);
         }
         
+    }
+    
     @Override
     public void setImagesXY(int imagesX, int imagesY) {
         this.imagesX = imagesX;

engine/src/test/jme3test/effect/TestMovingParticle.java

@@ -29,13 +29,16 @@
  * 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.effect;
 
 import com.jme3.app.SimpleApplication;
 import com.jme3.effect.ParticleEmitter;
 import com.jme3.effect.ParticleMesh.Type;
 import com.jme3.effect.shapes.EmitterSphereShape;
+import com.jme3.input.KeyInput;
+import com.jme3.input.controls.ActionListener;
+import com.jme3.input.controls.InputListener;
+import com.jme3.input.controls.KeyTrigger;
 import com.jme3.material.Material;
 import com.jme3.math.FastMath;
 import com.jme3.math.Vector3f;
@@ -57,7 +60,7 @@ public class TestMovingParticle  extends SimpleApplication {
     
     @Override
     public void simpleInitApp() {
-        emit = new ParticleEmitter("Emitter", Type.Triangle, 200);
+        emit = new ParticleEmitter("Emitter", Type.Triangle, 300);
         emit.setGravity(0, 0, 0);
         emit.setVelocityVariation(1);
         emit.setLowLife(1);
@@ -69,6 +72,17 @@ public class TestMovingParticle  extends SimpleApplication {
         emit.setMaterial(mat);
         
         rootNode.attachChild(emit);
+        
+        inputManager.addListener(new ActionListener() {
+            
+            public void onAction(String name, boolean isPressed, float tpf) {
+                if ("setNum".equals(name) && isPressed) {
+                    emit.setNumParticles(1000);
+                }
+            }
+        }, "setNum");
+        
+        inputManager.addMapping("setNum", new KeyTrigger(KeyInput.KEY_SPACE));
     }
     
     @Override
@@ -79,5 +93,4 @@ public class TestMovingParticle  extends SimpleApplication {
         float y = FastMath.sin(angle) * 2;
         emit.setLocalTranslation(x, 0, y);
     }
-
 }

engine/src/test/jme3test/effect/TestPointSprite.java

@@ -36,6 +36,9 @@ import com.jme3.app.SimpleApplication;
 import com.jme3.effect.ParticleEmitter;
 import com.jme3.effect.ParticleMesh.Type;
 import com.jme3.effect.shapes.EmitterBoxShape;
+import com.jme3.input.KeyInput;
+import com.jme3.input.controls.ActionListener;
+import com.jme3.input.controls.KeyTrigger;
 import com.jme3.material.Material;
 import com.jme3.math.ColorRGBA;
 import com.jme3.math.Vector3f;
@@ -49,13 +52,13 @@ public class TestPointSprite extends SimpleApplication {
 
     @Override
     public void simpleInitApp() {
-        ParticleEmitter emit = new ParticleEmitter("Emitter", Type.Point, 10000);
+        final ParticleEmitter emit = new ParticleEmitter("Emitter", Type.Point, 10000);
         emit.setShape(new EmitterBoxShape(new Vector3f(-1.8f, -1.8f, -1.8f),
                                           new Vector3f(1.8f, 1.8f, 1.8f)));
         emit.setGravity(0, 0, 0);
         emit.setLowLife(60);
         emit.setHighLife(60);
-        emit.setInitialVelocity(new Vector3f(0, 0, 0));
+        emit.getParticleInfluencer().setInitialVelocity(new Vector3f(0, 0, 0));
         emit.setImagesX(15);
         emit.setStartSize(0.05f);
         emit.setEndSize(0.05f);
@@ -70,6 +73,17 @@ public class TestPointSprite extends SimpleApplication {
         emit.setMaterial(mat);
 
         rootNode.attachChild(emit);
+        inputManager.addListener(new ActionListener() {
+            
+            public void onAction(String name, boolean isPressed, float tpf) {
+                if ("setNum".equals(name) && isPressed) {
+                    emit.setNumParticles(5000);
+                    emit.emitAllParticles();
+                }
+            }
+        }, "setNum");
+        
+        inputManager.addMapping("setNum", new KeyTrigger(KeyInput.KEY_SPACE));
         
     }