/**
* Merges all geometries in the collection into the output mesh. Does not take into account
* materials.
*
* @param geometries
* @param outMesh
*/
private void mergeGeometries(Mesh outMesh, List<Geometry> geometries) {
int[] compsForBuf = new int[VertexBuffer.Type.values().length];
VertexBuffer.Format[] formatForBuf = new VertexBuffer.Format[compsForBuf.length];
int totalVerts = 0;
int totalTris = 0;
int totalLodLevels = 0;
int maxWeights = -1;
Mesh.Mode mode = null;
for (Geometry geom : geometries) {
totalVerts += geom.getVertexCount();
totalTris += geom.getTriangleCount();
totalLodLevels = Math.min(totalLodLevels, geom.getMesh().getNumLodLevels());
if (maxVertCount < geom.getVertexCount()) {
maxVertCount = geom.getVertexCount();
}
Mesh.Mode listMode;
int components;
switch (geom.getMesh().getMode()) {
case Points:
listMode = Mesh.Mode.Points;
components = 1;
break;
case LineLoop:
case LineStrip:
case Lines:
listMode = Mesh.Mode.Lines;
components = 2;
break;
case TriangleFan:
case TriangleStrip:
case Triangles:
listMode = Mesh.Mode.Triangles;
components = 3;
break;
default:
throw new UnsupportedOperationException();
}
for (VertexBuffer vb : geom.getMesh().getBufferList().getArray()) {
compsForBuf[vb.getBufferType().ordinal()] = vb.getNumComponents();
formatForBuf[vb.getBufferType().ordinal()] = vb.getFormat();
}
maxWeights = Math.max(maxWeights, geom.getMesh().getMaxNumWeights());
if (mode != null && mode != listMode) {
throw new UnsupportedOperationException(
"Cannot combine different" + " primitive types: " + mode + " != " + listMode);
}
mode = listMode;
compsForBuf[VertexBuffer.Type.Index.ordinal()] = components;
}
outMesh.setMaxNumWeights(maxWeights);
outMesh.setMode(mode);
if (totalVerts >= 65536) {
// make sure we create an UnsignedInt buffer so
// we can fit all of the meshes
formatForBuf[VertexBuffer.Type.Index.ordinal()] = VertexBuffer.Format.UnsignedInt;
} else {
formatForBuf[VertexBuffer.Type.Index.ordinal()] = VertexBuffer.Format.UnsignedShort;
}
// generate output buffers based on retrieved info
for (int i = 0; i < compsForBuf.length; i++) {
if (compsForBuf[i] == 0) {
continue;
}
Buffer data;
if (i == VertexBuffer.Type.Index.ordinal()) {
data = VertexBuffer.createBuffer(formatForBuf[i], compsForBuf[i], totalTris);
} else {
data = VertexBuffer.createBuffer(formatForBuf[i], compsForBuf[i], totalVerts);
}
VertexBuffer vb = new VertexBuffer(VertexBuffer.Type.values()[i]);
vb.setupData(VertexBuffer.Usage.Dynamic, compsForBuf[i], formatForBuf[i], data);
outMesh.setBuffer(vb);
}
int globalVertIndex = 0;
int globalTriIndex = 0;
for (Geometry geom : geometries) {
Mesh inMesh = geom.getMesh();
if (!isBatch(geom)) {
geom.batch(this, globalVertIndex);
}
int geomVertCount = inMesh.getVertexCount();
int geomTriCount = inMesh.getTriangleCount();
for (int bufType = 0; bufType < compsForBuf.length; bufType++) {
VertexBuffer inBuf = inMesh.getBuffer(VertexBuffer.Type.values()[bufType]);
VertexBuffer outBuf = outMesh.getBuffer(VertexBuffer.Type.values()[bufType]);
if (outBuf == null) {
continue;
}
if (VertexBuffer.Type.Index.ordinal() == bufType) {
int components = compsForBuf[bufType];
IndexBuffer inIdx = inMesh.getIndicesAsList();
IndexBuffer outIdx = outMesh.getIndexBuffer();
for (int tri = 0; tri < geomTriCount; tri++) {
for (int comp = 0; comp < components; comp++) {
int idx = inIdx.get(tri * components + comp) + globalVertIndex;
outIdx.put((globalTriIndex + tri) * components + comp, idx);
}
}
} else if (VertexBuffer.Type.Position.ordinal() == bufType) {
FloatBuffer inPos = (FloatBuffer) inBuf.getData();
FloatBuffer outPos = (FloatBuffer) outBuf.getData();
doCopyBuffer(inPos, globalVertIndex, outPos, 3);
} else if (VertexBuffer.Type.Normal.ordinal() == bufType
|| VertexBuffer.Type.Tangent.ordinal() == bufType) {
FloatBuffer inPos = (FloatBuffer) inBuf.getData();
FloatBuffer outPos = (FloatBuffer) outBuf.getData();
doCopyBuffer(inPos, globalVertIndex, outPos, compsForBuf[bufType]);
if (VertexBuffer.Type.Tangent.ordinal() == bufType) {
useTangents = true;
}
} else {
inBuf.copyElements(0, outBuf, globalVertIndex, geomVertCount);
// for (int vert = 0; vert < geomVertCount; vert++) {
// int curGlobalVertIndex = globalVertIndex + vert;
// inBuf.copyElement(vert, outBuf, curGlobalVertIndex);
// }
}
}
globalVertIndex += geomVertCount;
globalTriIndex += geomTriCount;
}
}
/**
* Specific method for skinning with tangents to avoid cluttering the classic skinning calculation
* with null checks that would slow down the process even if tangents don't have to be computed.
* Also the iteration has additional indexes since tangent has 4 components instead of 3 for pos
* and norm
*
* @param maxWeightsPerVert maximum number of weights per vertex
* @param mesh the mesh
* @param offsetMatrices the offsetMaytrices to apply
* @param tb the tangent vertexBuffer
*/
private void applySkinningTangents(Mesh mesh, Matrix4f[] offsetMatrices, VertexBuffer tb) {
int maxWeightsPerVert = mesh.getMaxNumWeights();
if (maxWeightsPerVert <= 0) {
throw new IllegalStateException("Max weights per vert is incorrectly set!");
}
int fourMinusMaxWeights = 4 - maxWeightsPerVert;
// NOTE: This code assumes the vertex buffer is in bind pose
// resetToBind() has been called this frame
VertexBuffer vb = mesh.getBuffer(Type.Position);
FloatBuffer fvb = (FloatBuffer) vb.getData();
fvb.rewind();
VertexBuffer nb = mesh.getBuffer(Type.Normal);
FloatBuffer fnb = (FloatBuffer) nb.getData();
fnb.rewind();
FloatBuffer ftb = (FloatBuffer) tb.getData();
ftb.rewind();
// get boneIndexes and weights for mesh
ByteBuffer ib = (ByteBuffer) mesh.getBuffer(Type.BoneIndex).getData();
FloatBuffer wb = (FloatBuffer) mesh.getBuffer(Type.BoneWeight).getData();
ib.rewind();
wb.rewind();
float[] weights = wb.array();
byte[] indices = ib.array();
int idxWeights = 0;
TempVars vars = TempVars.get();
float[] posBuf = vars.skinPositions;
float[] normBuf = vars.skinNormals;
float[] tanBuf = vars.skinTangents;
int iterations = (int) FastMath.ceil(fvb.capacity() / ((float) posBuf.length));
int bufLength = 0;
int tanLength = 0;
for (int i = iterations - 1; i >= 0; i--) {
// read next set of positions and normals from native buffer
bufLength = Math.min(posBuf.length, fvb.remaining());
tanLength = Math.min(tanBuf.length, ftb.remaining());
fvb.get(posBuf, 0, bufLength);
fnb.get(normBuf, 0, bufLength);
ftb.get(tanBuf, 0, tanLength);
int verts = bufLength / 3;
int idxPositions = 0;
// tangents has their own index because of the 4 components
int idxTangents = 0;
// iterate vertices and apply skinning transform for each effecting bone
for (int vert = verts - 1; vert >= 0; vert--) {
float nmx = normBuf[idxPositions];
float vtx = posBuf[idxPositions++];
float nmy = normBuf[idxPositions];
float vty = posBuf[idxPositions++];
float nmz = normBuf[idxPositions];
float vtz = posBuf[idxPositions++];
float tnx = tanBuf[idxTangents++];
float tny = tanBuf[idxTangents++];
float tnz = tanBuf[idxTangents++];
// skipping the 4th component of the tangent since it doesn't have to be transformed
idxTangents++;
float rx = 0, ry = 0, rz = 0, rnx = 0, rny = 0, rnz = 0, rtx = 0, rty = 0, rtz = 0;
for (int w = maxWeightsPerVert - 1; w >= 0; w--) {
float weight = weights[idxWeights];
Matrix4f mat = offsetMatrices[indices[idxWeights++]];
rx += (mat.m00 * vtx + mat.m01 * vty + mat.m02 * vtz + mat.m03) * weight;
ry += (mat.m10 * vtx + mat.m11 * vty + mat.m12 * vtz + mat.m13) * weight;
rz += (mat.m20 * vtx + mat.m21 * vty + mat.m22 * vtz + mat.m23) * weight;
rnx += (nmx * mat.m00 + nmy * mat.m01 + nmz * mat.m02) * weight;
rny += (nmx * mat.m10 + nmy * mat.m11 + nmz * mat.m12) * weight;
rnz += (nmx * mat.m20 + nmy * mat.m21 + nmz * mat.m22) * weight;
rtx += (tnx * mat.m00 + tny * mat.m01 + tnz * mat.m02) * weight;
rty += (tnx * mat.m10 + tny * mat.m11 + tnz * mat.m12) * weight;
rtz += (tnx * mat.m20 + tny * mat.m21 + tnz * mat.m22) * weight;
}
idxWeights += fourMinusMaxWeights;
idxPositions -= 3;
normBuf[idxPositions] = rnx;
posBuf[idxPositions++] = rx;
normBuf[idxPositions] = rny;
posBuf[idxPositions++] = ry;
normBuf[idxPositions] = rnz;
posBuf[idxPositions++] = rz;
idxTangents -= 4;
tanBuf[idxTangents++] = rtx;
tanBuf[idxTangents++] = rty;
tanBuf[idxTangents++] = rtz;
// once again skipping the 4th component of the tangent
idxTangents++;
}
fvb.position(fvb.position() - bufLength);
fvb.put(posBuf, 0, bufLength);
fnb.position(fnb.position() - bufLength);
fnb.put(normBuf, 0, bufLength);
ftb.position(ftb.position() - tanLength);
ftb.put(tanBuf, 0, tanLength);
}
vars.release();
vb.updateData(fvb);
nb.updateData(fnb);
tb.updateData(ftb);
}
