private void DrawTransparentRenderGroups(GraphicsDevice device, ResourceFactory factory)
{
var alignment = device.UniformBufferMinOffsetAlignment;
var modelBuffStride = 64u;
var hostBuffStride = 1u;
if (alignment > 64u)
{
hostBuffStride = alignment / 64u;
modelBuffStride = alignment;
}
//
// First sort the transparent render elements by distance to eye point (if not culled).
//
var drawOrderMap = new SortedList <float, List <Tuple <IRenderGroupState, RenderGroupElement, IPrimitiveSet, uint> > >();
drawOrderMap.Capacity = _cullVisitor.RenderElementCount;
var transparentRenderGroupStates = _cullVisitor.TransparentRenderGroup.GetStateList();
var stateToUniformDict = new Dictionary <IRenderGroupState, Matrix4x4[]>();
foreach (var state in transparentRenderGroupStates)
{
var nDrawables = (uint)state.Elements.Count;
var modelMatrixViewBuffer = new Matrix4x4[nDrawables * hostBuffStride];
// Iterate over all elements in this state
for (var j = 0; j < nDrawables; ++j)
{
var renderElement = state.Elements[j];
modelMatrixViewBuffer[j * hostBuffStride] = state.Elements[j].ModelViewMatrix;
// Iterate over all primitive sets in this state
foreach (var pset in renderElement.PrimitiveSets)
{
var ctr = pset.GetBoundingBox().Center;
// Compute distance eye point
var modelView = renderElement.ModelViewMatrix;
var ctr_w = Vector3.Transform(ctr, modelView);
var dist = Vector3.Distance(ctr_w, Vector3.Zero);
if (!drawOrderMap.TryGetValue(dist, out var renderList))
{
renderList = new List <Tuple <IRenderGroupState, RenderGroupElement, IPrimitiveSet, uint> >();
drawOrderMap.Add(dist, renderList);
}
renderList.Add(Tuple.Create(state, renderElement, pset, (uint)j));
}
}
stateToUniformDict.Add(state, modelMatrixViewBuffer);
}
DeviceBuffer boundVertexBuffer = null;
DeviceBuffer boundIndexBuffer = null;
// Now draw transparent elements, back to front
IRenderGroupState lastState = null;
RenderGraph.RenderInfo ri = null;
var currModelViewMatrix = Matrix4x4.Identity;
foreach (var renderList in drawOrderMap.Reverse())
{
foreach (var element in renderList.Value)
{
var state = element.Item1;
if (null == lastState || state != lastState)
{
ri = state.GetPipelineAndResources(device, factory, _resourceLayout, Framebuffer);
// Set this state's pipeline
_commandList.SetPipeline(ri.Pipeline);
_commandList.UpdateBuffer(ri.ModelViewBuffer, 0, stateToUniformDict[state]);
// Set the resources
_commandList.SetGraphicsResourceSet(0, _resourceSet);
}
uint offset = element.Item4 * modelBuffStride;
// Set state-local resources
_commandList.SetGraphicsResourceSet(1, ri.ResourceSet, 1, ref offset);
var renderGroupElement = element.Item2;
if (boundVertexBuffer != renderGroupElement.VertexBuffer)
{
// Set vertex buffer
_commandList.SetVertexBuffer(0, renderGroupElement.VertexBuffer);
boundVertexBuffer = renderGroupElement.VertexBuffer;
}
if (boundIndexBuffer != renderGroupElement.IndexBuffer)
{
// Set index buffer
_commandList.SetIndexBuffer(renderGroupElement.IndexBuffer, IndexFormat.UInt32);
boundIndexBuffer = renderGroupElement.IndexBuffer;
}
element.Item3.Draw(_commandList);
lastState = state;
}
}
}
private void DrawTransparentRenderGroups(GraphicsDevice device, ResourceFactory factory)
{
//
// First sort the transparent render elements by distance to eye point (if not culled).
//
var drawOrderMap = new SortedList <float, List <Tuple <IRenderGroupState, RenderGroupElement, IPrimitiveSet> > >();
drawOrderMap.Capacity = _cullVisitor.RenderElementCount;
var transparentRenderGroupStates = _cullVisitor.TransparentRenderGroup.GetStateList();
foreach (var state in transparentRenderGroupStates)
{
// Iterate over all elements in this state
foreach (var renderElement in state.Elements)
{
// Iterate over all primitive sets in this state
foreach (var pset in renderElement.PrimitiveSets)
{
var ctr = pset.GetBoundingBox().Center;
// Compute distance eye point
var modelView = renderElement.ModelViewMatrix;
var ctr_w = Vector3.Transform(ctr, modelView);
var dist = Vector3.Distance(ctr_w, Vector3.Zero);
if (!drawOrderMap.TryGetValue(dist, out var renderList))
{
renderList = new List <Tuple <IRenderGroupState, RenderGroupElement, IPrimitiveSet> >();
drawOrderMap.Add(dist, renderList);
}
renderList.Add(Tuple.Create(state, renderElement, pset));
}
}
}
DeviceBuffer boundVertexBuffer = null;
DeviceBuffer boundIndexBuffer = null;
// Now draw transparent elements, back to front
IRenderGroupState lastState = null;
RenderGraph.RenderInfo ri = null;
var currModelViewMatrix = Matrix4x4.Identity;
foreach (var renderList in drawOrderMap.Reverse())
{
foreach (var element in renderList.Value)
{
var state = element.Item1;
if (null == lastState || state != lastState)
{
ri = state.GetPipelineAndResources(device, factory, _resourceLayout);
// Set this state's pipeline
_commandList.SetPipeline(ri.Pipeline);
// Set the resources
_commandList.SetGraphicsResourceSet(0, _resourceSet);
// Set state-local resources
_commandList.SetGraphicsResourceSet(1, ri.ResourceSet);
}
if (element.Item2.ModelViewMatrix != currModelViewMatrix)
{
_commandList.UpdateBuffer(ri.ModelViewBuffer, 0, element.Item2.ModelViewMatrix);
currModelViewMatrix = element.Item2.ModelViewMatrix;
}
var renderGroupElement = element.Item2;
if (boundVertexBuffer != renderGroupElement.VertexBuffer)
{
// Set vertex buffer
_commandList.SetVertexBuffer(0, renderGroupElement.VertexBuffer);
boundVertexBuffer = renderGroupElement.VertexBuffer;
}
if (boundIndexBuffer != renderGroupElement.IndexBuffer)
{
// Set index buffer
_commandList.SetIndexBuffer(renderGroupElement.IndexBuffer, IndexFormat.UInt16);
boundIndexBuffer = renderGroupElement.IndexBuffer;
}
element.Item3.Draw(_commandList);
lastState = state;
}
}
}
