private unsafe void RenderCommandLists(ImDrawDataPtr drawData)
{
_graphicsDevice.SetVertexBuffer(_vertexBuffer);
_graphicsDevice.Indices = _indexBuffer;
int vtxOffset = 0;
int idxOffset = 0;
for (int n = 0; n < drawData.CmdListsCount; n++)
{
ImDrawListPtr cmdList = drawData.CmdListsRange[n];
for (int cmdi = 0; cmdi < cmdList.CmdBuffer.Size; cmdi++)
{
ImDrawCmdPtr drawCmd = cmdList.CmdBuffer[cmdi];
if (!_loadedTextures.ContainsKey(drawCmd.TextureId))
{
throw new InvalidOperationException($"Could not find a texture with id '{drawCmd.TextureId}', please check your bindings");
}
_graphicsDevice.ScissorRectangle = new Rectangle(
(int)drawCmd.ClipRect.X,
(int)drawCmd.ClipRect.Y,
(int)(drawCmd.ClipRect.Z - drawCmd.ClipRect.X),
(int)(drawCmd.ClipRect.W - drawCmd.ClipRect.Y)
);
var effect = UpdateEffect(_loadedTextures[drawCmd.TextureId]);
foreach (var pass in effect.CurrentTechnique.Passes)
{
pass.Apply();
#pragma warning disable CS0618 // // FNA does not expose an alternative method.
_graphicsDevice.DrawIndexedPrimitives(
primitiveType: PrimitiveType.TriangleList,
baseVertex: vtxOffset,
minVertexIndex: 0,
numVertices: cmdList.VtxBuffer.Size,
startIndex: idxOffset,
primitiveCount: (int)drawCmd.ElemCount / 3
);
#pragma warning restore CS0618
}
idxOffset += (int)drawCmd.ElemCount;
}
vtxOffset += cmdList.VtxBuffer.Size;
}
}
private void RenderImDrawData(ImDrawDataPtr draw_data, GraphicsDevice gd, CommandList cl)
{
uint vertexOffsetInVertices = 0;
uint indexOffsetInElements = 0;
if (draw_data.CmdListsCount == 0)
{
return;
}
uint totalVBSize = (uint)(draw_data.TotalVtxCount * Unsafe.SizeOf <ImDrawVert>());
if (totalVBSize > _vertexBuffer.SizeInBytes)
{
gd.DisposeWhenIdle(_vertexBuffer);
_vertexBuffer = gd.ResourceFactory.CreateBuffer(new BufferDescription((uint)(totalVBSize * 1.5f), BufferUsage.VertexBuffer | BufferUsage.Dynamic));
}
uint totalIBSize = (uint)(draw_data.TotalIdxCount * sizeof(ushort));
if (totalIBSize > _indexBuffer.SizeInBytes)
{
gd.DisposeWhenIdle(_indexBuffer);
_indexBuffer = gd.ResourceFactory.CreateBuffer(new BufferDescription((uint)(totalIBSize * 1.5f), BufferUsage.IndexBuffer | BufferUsage.Dynamic));
}
for (int i = 0; i < draw_data.CmdListsCount; i++)
{
ImDrawListPtr cmd_list = draw_data.CmdListsRange[i];
cl.UpdateBuffer(
_vertexBuffer,
vertexOffsetInVertices * (uint)Unsafe.SizeOf <ImDrawVert>(),
cmd_list.VtxBuffer.Data,
(uint)(cmd_list.VtxBuffer.Size * Unsafe.SizeOf <ImDrawVert>()));
cl.UpdateBuffer(
_indexBuffer,
indexOffsetInElements * sizeof(ushort),
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
ImGuiIOPtr io = ImGui.GetIO();
Matrix4x4 mvp = Matrix4x4.CreateOrthographicOffCenter(
0f,
io.DisplaySize.X,
io.DisplaySize.Y,
0.0f,
-1.0f,
1.0f);
_gd.UpdateBuffer(_projMatrixBuffer, 0, ref mvp);
cl.SetVertexBuffer(0, _vertexBuffer);
cl.SetIndexBuffer(_indexBuffer, IndexFormat.UInt16);
cl.SetPipeline(_pipeline);
cl.SetGraphicsResourceSet(0, _mainResourceSet);
draw_data.ScaleClipRects(io.DisplayFramebufferScale);
// Render command lists
int vtx_offset = 0;
int idx_offset = 0;
for (int n = 0; n < draw_data.CmdListsCount; n++)
{
ImDrawListPtr cmd_list = draw_data.CmdListsRange[n];
for (int cmd_i = 0; cmd_i < cmd_list.CmdBuffer.Size; cmd_i++)
{
ImDrawCmdPtr pcmd = cmd_list.CmdBuffer[cmd_i];
if (pcmd.UserCallback != IntPtr.Zero)
{
throw new NotImplementedException();
}
else
{
if (pcmd.TextureId != IntPtr.Zero)
{
if (pcmd.TextureId == _fontAtlasID)
{
cl.SetGraphicsResourceSet(1, _fontTextureResourceSet);
}
else
{
cl.SetGraphicsResourceSet(1, GetImageResourceSet(pcmd.TextureId));
}
}
cl.SetScissorRect(
0,
(uint)pcmd.ClipRect.X,
(uint)pcmd.ClipRect.Y,
(uint)(pcmd.ClipRect.Z - pcmd.ClipRect.X),
(uint)(pcmd.ClipRect.W - pcmd.ClipRect.Y));
cl.DrawIndexed(pcmd.ElemCount, 1, (uint)idx_offset, vtx_offset, 0);
}
idx_offset += (int)pcmd.ElemCount;
}
vtx_offset += cmd_list.VtxBuffer.Size;
}
}
