/// <summary>
/// Generates scene graph updates for renderer.
/// </summary>
public async IAsyncEnumerable <IRenderCommand> Process(AssertionBatch assertionBatch)
{
var knownUpdateObjects = new List <ObjectIdentityBase>();
foreach (var assertion in assertionBatch.Assertions)
{
if (assertion is GetPickingInfo getPickingInfo)
{
yield return(new RenderCommands.RequestPickingInfo(getPickingInfo.ScreenX, getPickingInfo.ScreenY));
}
else if (assertion is Core.Assertions.ClearColor clearColor)
{
_sceneGraph.RgbClearColor = new (clearColor.Red, clearColor.Green, clearColor.Blue, 1.0f);
yield return(new RenderCommands.ClearColor(_sceneGraph.RgbClearColor));
}
else if (assertion is CameraProjectionPerspective projectionPerspective)
{
// Projection matrix is set in uniforms
yield return(new RenderCommands.SetProjectionMatrix(_sceneGraph, projectionPerspective.FieldOfViewVerticalDegrees,
projectionPerspective.NearPlane, projectionPerspective.FarPlane));
}
else if (assertion is CameraOrientation cameraOrientation)
{
// View matrix is set in uniforms
_sceneGraph.ViewMatrix = cameraOrientation.ToMatrix();
}
else if (assertion is Core.Assertions.Vertex assertionVertex)
{
if (!_sceneGraph.Vertices.TryGetValue(assertionVertex.VertexId, out Core.Scene.Vertex vertex))
{
vertex = new Core.Scene.Vertex(_sceneGraph, assertionVertex.VertexId);
_sceneGraph.Vertices[assertionVertex.VertexId] = vertex;
}
if (assertionVertex.Coordinates != default)
{
vertex.Coordinates = assertionVertex.Coordinates;
knownUpdateObjects.Add(vertex);
}
}
else if (assertion is Core.Assertions.Triangle triangle)
{
var newTriangle = new Core.Scene.Triangle(_sceneGraph, triangle.TriangleId)
{
VertexIds = triangle.VertexIds
};
_partialObjectsWatchList.AddLast(newTriangle);
_sceneGraph.Triangles[triangle.TriangleId] = newTriangle;
}
else if (assertion is Core.Assertions.GrabScreenshot)
{
yield return(new RenderCommands.GrabScreenshot(_renderWindow, _cancellationTokenManager));
}
else if (assertion is Core.Assertions.Texture texture)
{
// Pre-load texture to avoid doing this in the function setting OpenGL state
var loadedImage = await _imageLoader.LoadImage(new Uri(texture.Uri));
_sceneGraph.Textures[texture.TextureId] = new Core.Scene.Texture(_sceneGraph, texture.TextureId, loadedImage.BufferRgba,
loadedImage.Width, loadedImage.Height);
}
else if (assertion is TexCoords texCoords)
{
_sceneGraph.SurfaceVertexTexCoords[texCoords.ObjectIdentifier] = texCoords;
}
else if (assertion is SurfaceColor surfaceColor)
{
_sceneGraph.SurfaceVertexColors[surfaceColor.ObjectIdentifier] = surfaceColor;
}
else
{
throw new ArgumentException($"Unknown assertion type: {assertion.GetType()}");
}
}
// Split objects into new and update lists
var newRenderTriangles = new List <Core.Scene.Triangle>();
// Get known complete geometry
LinkedListNode <Core.Scene.Triangle> currentNode = _partialObjectsWatchList.First;
while (currentNode != null)
{
if (_bufferManager.HasExistingTriangleBuffer(currentNode.Value))
{
knownUpdateObjects.Add(currentNode.Value);
currentNode = currentNode.Next;
continue;
}
if (!currentNode.Value.HasMinimumRenderInfo)
{
currentNode = currentNode.Next;
continue;
}
newRenderTriangles.Add(currentNode.Value);
var next = currentNode.Next;
_partialObjectsWatchList.Remove(currentNode);
currentNode = next;
}
if (newRenderTriangles.Any())
{
yield return(_bufferManager.CreateRenderCommands(newRenderTriangles));
}
if (knownUpdateObjects.Any())
{
foreach (var reloadCommand in _bufferManager.CreateReloadCommands(knownUpdateObjects))
{
yield return(reloadCommand);
}
}
}