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jMonkeyEngine is a 3-D game engine for adventurous Java developers
/*
* Copyright (c) 2009-2021 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
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* 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.scene.instancing;
import com.jme3.bounding.BoundingBox;
import com.jme3.bounding.BoundingVolume;
import com.jme3.collision.Collidable;
import com.jme3.collision.CollisionResults;
import com.jme3.export.InputCapsule;
import com.jme3.export.JmeExporter;
import com.jme3.export.JmeImporter;
import com.jme3.export.OutputCapsule;
import com.jme3.export.Savable;
import com.jme3.math.Matrix3f;
import com.jme3.math.Matrix4f;
import com.jme3.math.Quaternion;
import com.jme3.renderer.Camera;
import com.jme3.renderer.Camera.FrustumIntersect;
import com.jme3.scene.Geometry;
import com.jme3.scene.Spatial;
import com.jme3.scene.VertexBuffer;
import com.jme3.scene.VertexBuffer.Format;
import com.jme3.scene.VertexBuffer.Type;
import com.jme3.scene.VertexBuffer.Usage;
import com.jme3.util.BufferUtils;
import com.jme3.util.TempVars;
import com.jme3.util.clone.Cloner;
import java.io.IOException;
import java.nio.FloatBuffer;
import java.util.ArrayList;
import java.util.Arrays;
public class InstancedGeometry extends Geometry {
private static final int INSTANCE_SIZE = 16;
private VertexBuffer[] globalInstanceData;
private VertexBuffer transformInstanceData;
private Geometry[] geometries = new Geometry[1];
private int firstUnusedIndex = 0;
private int numVisibleInstances = 0;
private Camera cam;
public InstancedGeometry() {
super();
setIgnoreTransform(true);
setBatchHint(BatchHint.Never);
setMaxNumInstances(1);
}
/**
* Creates instanced geometry with the specified mode and name.
*
* @param name The name of the spatial.
*
* @see Spatial#Spatial(java.lang.String)
*/
public InstancedGeometry(String name) {
super(name);
setIgnoreTransform(true);
setBatchHint(BatchHint.Never);
setMaxNumInstances(1);
}
/**
* Global user specified per-instance data.
*
* By default set to null, specify an array of VertexBuffers
* via {@link #setGlobalUserInstanceData(com.jme3.scene.VertexBuffer[]) }.
*
* @return global user specified per-instance data.
* @see #setGlobalUserInstanceData(com.jme3.scene.VertexBuffer[])
*/
public VertexBuffer[] getGlobalUserInstanceData() {
return globalInstanceData;
}
/**
* Specify global user per-instance data.
*
* By default set to null, specify an array of VertexBuffers
* that contain per-instance vertex attributes.
*
* @param globalInstanceData global user per-instance data.
*
* @throws IllegalArgumentException If one of the VertexBuffers is not
* {@link VertexBuffer#setInstanced(boolean) instanced}.
*/
public void setGlobalUserInstanceData(VertexBuffer[] globalInstanceData) {
this.globalInstanceData = globalInstanceData;
}
/**
* Specify camera specific user per-instance data.
*
* @param transformInstanceData The transforms for each instance.
*/
public void setTransformUserInstanceData(VertexBuffer transformInstanceData) {
this.transformInstanceData = transformInstanceData;
}
/**
* Return user per-instance transform data.
*
* @return The per-instance transform data.
*
* @see #setTransformUserInstanceData(com.jme3.scene.VertexBuffer)
*/
public VertexBuffer getTransformUserInstanceData() {
return transformInstanceData;
}
private void updateInstance(Matrix4f worldMatrix, float[] store,
int offset, Matrix3f tempMat3,
Quaternion tempQuat) {
worldMatrix.toRotationMatrix(tempMat3);
tempMat3.invertLocal();
// NOTE: No need to take the transpose in order to encode
// into quaternion, the multiplication in the shader is vec * quat
// apparently...
tempQuat.fromRotationMatrix(tempMat3);
// Column-major encoding. The "W" field in each of the encoded
// vectors represents the quaternion.
store[offset + 0] = worldMatrix.m00;
store[offset + 1] = worldMatrix.m10;
store[offset + 2] = worldMatrix.m20;
store[offset + 3] = tempQuat.getX();
store[offset + 4] = worldMatrix.m01;
store[offset + 5] = worldMatrix.m11;
store[offset + 6] = worldMatrix.m21;
store[offset + 7] = tempQuat.getY();
store[offset + 8] = worldMatrix.m02;
store[offset + 9] = worldMatrix.m12;
store[offset + 10] = worldMatrix.m22;
store[offset + 11] = tempQuat.getZ();
store[offset + 12] = worldMatrix.m03;
store[offset + 13] = worldMatrix.m13;
store[offset + 14] = worldMatrix.m23;
store[offset + 15] = tempQuat.getW();
}
/**
* Set the maximum amount of instances that can be rendered by this
* instanced geometry when mode is set to auto.
*
* This re-allocates internal structures and therefore should be called
* only when necessary.
*
* @param maxNumInstances The maximum number of instances that can be
* rendered.
*
* @throws IllegalStateException If mode is set to manual.
* @throws IllegalArgumentException If maxNumInstances is zero or negative
*/
public final void setMaxNumInstances(int maxNumInstances) {
if (maxNumInstances < 1) {
throw new IllegalArgumentException("maxNumInstances must be 1 or higher");
}
Geometry[] originalGeometries = geometries;
this.geometries = new Geometry[maxNumInstances];
if (originalGeometries != null) {
System.arraycopy(originalGeometries, 0, geometries, 0, originalGeometries.length);
}
// Resize instance data.
if (transformInstanceData != null) {
BufferUtils.destroyDirectBuffer(transformInstanceData.getData());
transformInstanceData.updateData(BufferUtils.createFloatBuffer(geometries.length * INSTANCE_SIZE));
} else if (transformInstanceData == null) {
transformInstanceData = new VertexBuffer(Type.InstanceData);
transformInstanceData.setInstanced(true);
transformInstanceData.setupData(Usage.Stream,
INSTANCE_SIZE,
Format.Float,
BufferUtils.createFloatBuffer(geometries.length * INSTANCE_SIZE));
}
}
public int getMaxNumInstances() {
return geometries.length;
}
/**
* @return The number of instances are visible by camera.
*/
public int getNumVisibleInstances() {
return numVisibleInstances;
}
/**
* @return The number of instances are in this {@link InstancedGeometry}
*/
public int getNumInstances() {
int count = 0;
for (int i = 0; i < geometries.length; i++) {
if (geometries[i] != null) {
count++;
}
}
return count;
}
public boolean isEmpty() {
return getNumInstances() == 0;
}
private void swap(int idx1, int idx2) {
Geometry g = geometries[idx1];
geometries[idx1] = geometries[idx2];
geometries[idx2] = g;
if (geometries[idx1] != null) {
InstancedNode.setGeometryStartIndex2(geometries[idx1], idx1);
}
if (geometries[idx2] != null) {
InstancedNode.setGeometryStartIndex2(geometries[idx2], idx2);
}
}
public void updateInstances() {
FloatBuffer fb = (FloatBuffer) transformInstanceData.getData();
fb.limit(fb.capacity());
fb.position(0);
int numCulledGeometries = 0;
TempVars vars = TempVars.get();
{
float[] temp = vars.matrixWrite;
for (int i = 0; i < firstUnusedIndex; i++) {
Geometry geom = geometries[i];
if (geom == null) {
geom = geometries[firstUnusedIndex - 1];
if (geom == null) {
throw new AssertionError();
}
swap(i, firstUnusedIndex - 1);
while (geometries[firstUnusedIndex -1] == null) {
firstUnusedIndex--;
}
}
if (cam != null) {
BoundingVolume bv = geom.getWorldBound();
int save = cam.getPlaneState();
cam.setPlaneState(0);
FrustumIntersect intersect = cam.contains(bv);
cam.setPlaneState(save);
if (intersect == FrustumIntersect.Outside) {
numCulledGeometries++;
continue;
}
}
Matrix4f worldMatrix = geom.getWorldMatrix();
updateInstance(worldMatrix, temp, 0, vars.tempMat3, vars.quat1);
fb.put(temp);
}
}
vars.release();
fb.flip();
numVisibleInstances = firstUnusedIndex - numCulledGeometries;
if (fb.limit() / INSTANCE_SIZE != numVisibleInstances) {
throw new AssertionError();
}
transformInstanceData.updateData(fb);
}
public void deleteInstance(Geometry geom) {
int idx = InstancedNode.getGeometryStartIndex2(geom);
InstancedNode.setGeometryStartIndex2(geom, -1);
geometries[idx] = null;
if (idx == firstUnusedIndex - 1) {
// Deleting the last element.
// Move index back.
firstUnusedIndex--;
while (geometries[firstUnusedIndex] == null) {
firstUnusedIndex--;
if (firstUnusedIndex < 0) {
break;
}
}
firstUnusedIndex++;
} else {
// Deleting element in the middle
}
setBoundRefresh();
}
public void addInstance(Geometry geometry) {
if (geometry == null) {
throw new IllegalArgumentException("geometry cannot be null");
}
// Take an index from the end.
if (firstUnusedIndex + 1 >= geometries.length) {
// No more room.
setMaxNumInstances(getMaxNumInstances() * 2);
}
int freeIndex = firstUnusedIndex;
firstUnusedIndex++;
geometries[freeIndex] = geometry;
InstancedNode.setGeometryStartIndex2(geometry, freeIndex);
setBoundRefresh();
}
@Override
protected void updateWorldBound() {
refreshFlags &= ~RF_BOUND;
BoundingVolume resultBound = null;
for (int i = 0; i < firstUnusedIndex; i++) {
Geometry geom = geometries[i];
if (geom != null) {
if (resultBound != null) {
// merge current world bound with child world bound
resultBound.mergeLocal(geom.getWorldBound());
} else {
// set world bound to first non-null child world bound
if (geom.getWorldBound() != null) {
resultBound = geom.getWorldBound().clone(this.worldBound);
}
}
}
}
if (resultBound == null) {
resultBound = new BoundingBox(getWorldTranslation(), 0f, 0f, 0f);
}
this.worldBound = resultBound;
}
public Geometry[] getGeometries() {
return geometries;
}
@SuppressWarnings("unchecked")
public VertexBuffer[] getAllInstanceData() {
ArrayList allData = new ArrayList();
if (transformInstanceData != null) {
allData.add(transformInstanceData);
}
if (globalInstanceData != null) {
allData.addAll(Arrays.asList(globalInstanceData));
}
return allData.toArray(new VertexBuffer[allData.size()]);
}
@Override
public boolean checkCulling(Camera cam) {
this.cam = cam;
return super.checkCulling(cam);
}
@Override
public int collideWith(Collidable other, CollisionResults results) {
return 0; // Ignore collision
}
/**
* Called internally by com.jme3.util.clone.Cloner. Do not call directly.
*/
@Override
public void cloneFields(Cloner cloner, Object original) {
super.cloneFields(cloner, original);
this.globalInstanceData = cloner.clone(globalInstanceData);
this.transformInstanceData = cloner.clone(transformInstanceData);
this.geometries = cloner.clone(geometries);
}
@Override
public void write(JmeExporter exporter) throws IOException {
super.write(exporter);
OutputCapsule capsule = exporter.getCapsule(this);
//capsule.write(currentNumInstances, "cur_num_instances", 1);
capsule.write(geometries, "geometries", null);
}
@Override
public void read(JmeImporter importer) throws IOException {
super.read(importer);
InputCapsule capsule = importer.getCapsule(this);
//currentNumInstances = capsule.readInt("cur_num_instances", 1);
Savable[] geometrySavables = capsule.readSavableArray("geometries", null);
geometries = new Geometry[geometrySavables.length];
for (int i = 0; i < geometrySavables.length; i++) {
geometries[i] = (Geometry) geometrySavables[i];
}
}
/**
* Destroy internal buffers.
*/
protected void cleanup() {
BufferUtils.destroyDirectBuffer(transformInstanceData.getData());
transformInstanceData = null;
geometries = null;
}
}
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