/// <summary>
/// Expand the internal list of billboards
/// </summary>
private void Expand()
{
fMaxObjects = fMaxObjects * 2;
VertexBillboardParticle[] vertices = new VertexBillboardParticle[fMaxObjects * 4];
short[] indices = new short[fMaxObjects * 6];
for (int i = 0; i < fVertices.Length; i++)
{
vertices[i] = fVertices[i];
}
for (int i = 0; i < fIndices.Length; i++)
{
indices[i] = fIndices[i];
}
fIndices = indices;
fVertices = vertices;
}
/// <summary>
/// Add a new object
/// </summary>
public bool AddObject(Vector3 position, Color color, float size)
{
if (fObjects > MAX_OBJECTS)
{
return(false);
}
if (fObjects >= fMaxObjects)
{
Expand();
}
int verticeNumberBase = fIndexVertice;
if (fMode == BillboardMode.PointList)
{
fVertices[fIndexVertice++] = new VertexBillboardParticle(position, Vector2.Zero, size, color);
fVertices[fIndexVertice++] = new VertexBillboardParticle(position, new Vector2(1, 0), size, color);
fVertices[fIndexVertice++] = new VertexBillboardParticle(position, Vector2.One, size, color);
fVertices[fIndexVertice++] = new VertexBillboardParticle(position, new Vector2(0, 1), size, color);
}
else
{
float size2 = size * 0.5f;
fVertices[fIndexVertice++] = new VertexBillboardParticle(new Vector3(position.X - size2, position.Y - size2, position.Z), new Vector2(0, 1), size, color);
fVertices[fIndexVertice++] = new VertexBillboardParticle(new Vector3(position.X + size2, position.Y - size2, position.Z), new Vector2(1, 1), size, color);
fVertices[fIndexVertice++] = new VertexBillboardParticle(new Vector3(position.X + size2, position.Y + size2, position.Z), new Vector2(1, 0), size, color);
fVertices[fIndexVertice++] = new VertexBillboardParticle(new Vector3(position.X - size2, position.Y + size2, position.Z), new Vector2(0, 0), size, color);
}
fIndices[fIndexIndice++] = (short)(0 + verticeNumberBase);
fIndices[fIndexIndice++] = (short)(1 + verticeNumberBase);
fIndices[fIndexIndice++] = (short)(2 + verticeNumberBase);
fIndices[fIndexIndice++] = (short)(0 + verticeNumberBase);
fIndices[fIndexIndice++] = (short)(2 + verticeNumberBase);
fIndices[fIndexIndice++] = (short)(3 + verticeNumberBase);
fObjects++;
fVertexBufferLoaded = false;
return(true);
}
