private unsafe void RenderImDrawData(DrawData *draw_data, GraphicsDevice gd, CommandList cl)
{
uint vertexOffsetInVertices = 0;
uint indexOffsetInElements = 0;
if (draw_data->CmdListsCount == 0)
{
return;
}
uint totalVBSize = (uint)(draw_data->TotalVtxCount * sizeof(DrawVert));
if (totalVBSize > _vertexBuffer.SizeInBytes)
{
_vertexBuffer.Dispose();
_vertexBuffer = gd.ResourceFactory.CreateVertexBuffer(new BufferDescription((ulong)(totalVBSize * 1.5f), true));
}
uint totalIBSize = (uint)(draw_data->TotalIdxCount * sizeof(ushort));
if (totalIBSize > _indexBuffer.SizeInBytes)
{
_indexBuffer.Dispose();
_indexBuffer = gd.ResourceFactory.CreateIndexBuffer(new IndexBufferDescription((ulong)(totalIBSize * 1.5f), IndexFormat.UInt16, true));
}
for (int i = 0; i < draw_data->CmdListsCount; i++)
{
NativeDrawList *cmd_list = draw_data->CmdLists[i];
cl.UpdateBuffer(
_vertexBuffer,
(uint)(vertexOffsetInVertices * sizeof(DrawVert)),
new IntPtr(cmd_list->VtxBuffer.Data),
(uint)(cmd_list->VtxBuffer.Size * sizeof(DrawVert)));
cl.UpdateBuffer(
_indexBuffer,
(uint)(indexOffsetInElements * sizeof(ushort)),
new IntPtr(cmd_list->IdxBuffer.Data),
(uint)(cmd_list->IdxBuffer.Size * sizeof(ushort)));
vertexOffsetInVertices += (uint)cmd_list->VtxBuffer.Size;
indexOffsetInElements += (uint)cmd_list->IdxBuffer.Size;
}
// Setup orthographic projection matrix into our constant buffer
{
var io = ImGui.GetIO();
Matrix4x4 mvp = Matrix4x4.CreateOrthographicOffCenter(
0f,
io.DisplaySize.X,
io.DisplaySize.Y,
0.0f,
-1.0f,
1.0f);
cl.UpdateBuffer(_projMatrixBuffer, 0, ref mvp);
}
cl.SetVertexBuffer(0, _vertexBuffer);
cl.SetIndexBuffer(_indexBuffer);
cl.SetPipeline(_pipeline);
cl.SetResourceSet(0, _resourceSet);
ImGui.ScaleClipRects(draw_data, ImGui.GetIO().DisplayFramebufferScale);
// Render command lists
int vtx_offset = 0;
int idx_offset = 0;
for (int n = 0; n < draw_data->CmdListsCount; n++)
{
NativeDrawList *cmd_list = draw_data->CmdLists[n];
for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
{
DrawCmd *pcmd = &(((DrawCmd *)cmd_list->CmdBuffer.Data)[cmd_i]);
if (pcmd->UserCallback != IntPtr.Zero)
{
throw new NotImplementedException();
}
else
{
if (pcmd->TextureId != IntPtr.Zero)
{
if (pcmd->TextureId != new IntPtr(_fontAtlasID))
{
throw new NotImplementedException();
}
}
cl.SetScissorRect(
0,
(uint)pcmd->ClipRect.X,
(uint)pcmd->ClipRect.Y,
(uint)pcmd->ClipRect.Z,
(uint)pcmd->ClipRect.W);
cl.Draw(pcmd->ElemCount, 1, (uint)idx_offset, vtx_offset, 0);
}
idx_offset += (int)pcmd->ElemCount;
}
vtx_offset += cmd_list->VtxBuffer.Size;
}
}