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 (!ImGuiTextureBinder.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(ImGuiTextureBinder.GetTexture(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;
}
}
/// <summary> /// Creates a pointer to a texture, which can be passed through ImGui calls such as <see cref="MediaTypeNames.Image" />. That pointer is then used by ImGui to let us know what texture to draw /// </summary> public IntPtr BindTexture(Texture2D texture) => ImGuiTextureBinder.GetOrCreateBinding(texture);
