public void Reset()
{
ModelMatrixStack.Clear();
ModelMatrixStack.Push(Matrix4x4.Identity);
PipelineStateStack.Clear();
OpaqueRenderGroup.Reset();
TransparentRenderGroup.Reset();
RenderElementCount = 0;
}
/// <summary>
/// Cull Visitor for billboard
/// </summary>
/// <param name="billboard"></param>
public override void Apply(IBillboard billboard)
{
var bb = billboard.GetBoundingBox();
if (IsCulled(bb, ModelMatrixStack.Peek()))
{
return;
}
IPipelineState pso = null;
// Node specific state
if (billboard.HasPipelineState)
{
pso = billboard.PipelineState;
}
// Shared State
else if (PipelineStateStack.Count != 0)
{
pso = PipelineStateStack.Peek();
}
// Fallback
else
{
pso = PipelineState.Create();
}
var eyeLocal = GetEyeLocal();
var modelView = GetModelViewMatrix();
foreach (var drawable in billboard.Drawables)
{
// TODO - need to modify is culled to handle billboard matrix offset
//if (IsCulled(drawable.GetBoundingBox(), ModelMatrixStack.Peek())) continue;
var billboardMatrix = billboard.ComputeMatrix(modelView, eyeLocal);
var drawablePso = pso;
if (drawable.HasPipelineState)
{
drawablePso = drawable.PipelineState;
}
//
// This allocates / updates vbo/ibos
//
drawable.ConfigureDeviceBuffers(GraphicsDevice, ResourceFactory);
var renderElementCache = new Dictionary <IRenderGroupState, RenderGroupElement>();
foreach (var pset in drawable.PrimitiveSets)
{
// TODO - need to modify is culled to handle billboard matrix offset
//if (IsCulled(pset.GetBoundingBox(), ModelMatrixStack.Peek())) continue;
//
// Sort into appropriate render group
//
IRenderGroupState renderGroupState = null;
if (drawablePso.BlendStateDescription.AttachmentStates.Contains(BlendAttachmentDescription.AlphaBlend))
{
renderGroupState = TransparentRenderGroup.GetOrCreateState(drawablePso, pset.PrimitiveTopology, drawable.VertexLayout);
}
else
{
renderGroupState = OpaqueRenderGroup.GetOrCreateState(drawablePso, pset.PrimitiveTopology, drawable.VertexLayout);
}
if (false == renderElementCache.TryGetValue(renderGroupState, out var renderElement))
{
renderElement = new RenderGroupElement()
{
ModelViewMatrix = billboardMatrix.PostMultiply(modelView),
VertexBuffer = drawable.GetVertexBufferForDevice(GraphicsDevice),
IndexBuffer = drawable.GetIndexBufferForDevice(GraphicsDevice),
PrimitiveSets = new List <IPrimitiveSet>()
};
renderGroupState.Elements.Add(renderElement);
renderElementCache.Add(renderGroupState, renderElement);
}
renderElement.PrimitiveSets.Add(pset);
}
}
}
