void CC3DataReader::initOnData( CCData* data )
{
_data = data;
_data->retain();
_readRange = CCRangeMake(0, 0);
_isBigEndian = false;
_wasReadBeyondEOF = false;
}
void CC3MeshParticleEmitter::copyTemplateContentToParticle( CC3MeshParticle* aParticle )
{
// Get the particle template mesh
CC3Mesh* templateMesh = aParticle->getTemplateMesh();
// Copy vertex content
GLuint vtxCount = aParticle->getVertexCount();
GLuint firstVtx = aParticle->getFirstVertexOffset();
getMesh()->copyVertices( vtxCount, 0, templateMesh, firstVtx );
// If this mesh does not have vertex indices, we're done
if ( !getMesh()->hasVertexIndices() )
return;
// Copy vertex indices, taking into consideration the staring index of the vertex content in this mesh.
GLuint vtxIdxCount = aParticle->getVertexIndexCount();
GLuint firstVtxIdx = aParticle->getFirstVertexIndexOffset();
getMesh()->copyVertexIndices( vtxIdxCount, 0, templateMesh, firstVtxIdx, firstVtx );
addDirtyVertexIndexRange( CCRangeMake(firstVtxIdx, vtxIdxCount) );
}
void CC3MeshParticleEmitter::removeParticle( CC3Particle* aParticle, GLuint anIndex )
{
super::removeParticle( aParticle, anIndex ); // Decrements particleCount and vertexCount
GLuint partCount = getParticleCount(); // Get the decremented particleCount
// Particle being removed
CC3MeshParticle* deadParticle = (CC3MeshParticle*)aParticle;
GLuint deadFirstVtx = deadParticle->getFirstVertexOffset();
GLuint deadVtxCount = deadParticle->getVertexCount();
GLuint deadFirstVtxIdx = deadParticle->getFirstVertexIndexOffset();
GLuint deadVtxIdxCount = deadParticle->getVertexIndexCount();
// Last living particle
CC3MeshParticle* lastParticle = getMeshParticleAt( partCount );
GLuint lastFirstVtx = lastParticle->getFirstVertexOffset();
GLuint lastVtxCount = lastParticle->getVertexCount();
GLuint lastFirstVtxIdx = lastParticle->getFirstVertexIndexOffset();
GLuint lastVtxIdxCount = lastParticle->getVertexIndexCount();
// Remove the template mesh from the particle, even if the particle will be reused.
// This gives the emitter a chance to use a different template mesh when it reuses the particle.
// Clear it before removing the particle, because the particle may disappear when removed from
// this emitter. First, take note of whether the last particle has the same template mesh as the
// last particle. This knowledge is used below when copying vertex indices.
bool isSameTemplateMesh = (deadParticle->getTemplateMesh() == lastParticle->getTemplateMesh());
deadParticle->setTemplateMesh( NULL );
if (anIndex >= partCount)
{
CC3_TRACE("[ptc]Removing particle at %d by doing nothing, since particle count is now %d.", anIndex, partCount);
}
else if (deadVtxCount == lastVtxCount && deadVtxIdxCount == lastVtxIdxCount)
{
// If the two particles have the same number of vertices and vertex indices, we can swap them.
CC3_TRACE("[ptc]Removing particle at %d by swapping particles of identical size.", anIndex);
// Move the last living particle into the slot that is being vacated
m_particles->exchangeObjectAtIndex( anIndex, partCount );
// Swap the vertex offsets of the two particles
deadParticle->setFirstVertexOffset( lastFirstVtx );
deadParticle->setFirstVertexIndexOffset( lastFirstVtxIdx );
lastParticle->setFirstVertexOffset( deadFirstVtx );
lastParticle->setFirstVertexIndexOffset( deadFirstVtxIdx );
// Update the underlying mesh vertex content and mark the updated vertex dirty
getMesh()->copyVertices( deadVtxCount, lastFirstVtx, deadFirstVtx );
addDirtyVertexRange( deadParticle->getVertexRange() );
// If the template meshes are the same, we don't need to update the vertex indices.
if ( !isSameTemplateMesh )
{
getMesh()->getVertexIndices()->copyVertices( lastVtxIdxCount, lastFirstVtxIdx, deadFirstVtxIdx, (deadFirstVtx - lastFirstVtx) );
addDirtyVertexIndexRange( deadParticle->getVertexIndexRange() );
}
}
else
{
CC3_TRACE("[ptc]Removing particle at %d by removing particle with %d vertices from collection.", anIndex, deadVtxCount);
// Move the vertices in the mesh to fill the gap created by the removed particle
GLuint srcVtxStart = (deadFirstVtx + deadVtxCount); // Start after removed particle
GLuint srcVtxEnd = (lastFirstVtx + lastVtxCount); // End after last living particle
GLuint vtxCount = srcVtxEnd - srcVtxStart;
GLuint dstVtxStart = deadFirstVtx;
getMesh()->copyVertices( vtxCount, srcVtxStart, dstVtxStart );
addDirtyVertexRange( CCRangeMake(dstVtxStart, vtxCount) );
// If the mesh has vertex indices, move them to fill the gap created by the removed particle
// and adjust their values to fill the gap created in the vertex content.
GLuint srcVtxIdxStart = (deadFirstVtxIdx + deadVtxIdxCount); // Start after removed particle
GLuint srcVtxIdxEnd = (lastFirstVtxIdx + lastVtxIdxCount); // End after last living particle
GLuint vtxIdxCount = srcVtxIdxEnd - srcVtxIdxStart;
GLuint dstVtxIdxStart = deadFirstVtxIdx;
getMesh()->copyVertexIndices( vtxIdxCount, srcVtxIdxStart, dstVtxIdxStart, -(GLint)deadVtxCount );
addDirtyVertexIndexRange( CCRangeMake(dstVtxIdxStart, vtxIdxCount) );
// Remove the particle from particles collection,
// Do this last in case the particle is only being held by this collection.
m_particles->removeObjectAtIndex( anIndex );
// Adjust the firstVertexOffset and firstVertexIndexOffset properties of each remaining
// particle to fill in the gap created by removing the particle from the mesh arrays.
// Do this after the dead particle has been removed from the collection.
for (GLuint partIdx = anIndex; partIdx < partCount; partIdx++)
{
CC3MeshParticle* mp = getMeshParticleAt( partIdx );
GLuint firstVertexOffset = mp->getFirstVertexOffset();
GLuint firstVertexIndexOffset = mp->getFirstVertexIndexOffset();
firstVertexOffset -= deadVtxCount;
firstVertexIndexOffset -= deadVtxIdxCount;
mp->setFirstVertexOffset( firstVertexOffset );
mp->setFirstVertexIndexOffset( firstVertexIndexOffset );
}
}
}
CCRange CC3PointParticle::getVertexIndexRange()
{
return CCRangeMake(m_particleIndex, getVertexIndexCount());
}
