/// <summary>
/// The primary rendering logic. Here, the current object is rendered using OpenGL.
/// </summary>
public void RenderFrame()
{
ThrowIfDisposed();
lock (_renderTargetLock)
{
// Make sure the viewport is accurate for the current widget size on screen
var widgetWidth = _viewportWidget.AllocatedWidth;
var widgetHeight = _viewportWidget.AllocatedHeight;
GL.Viewport(0, 0, widgetWidth, widgetHeight);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
if (!this.HasRenderTarget || this.RenderTarget is null)
{
return;
}
// Calculate the current relative movement of the camera
if (this.WantsToMove)
{
switch (this.RenderTarget.Projection)
{
case ProjectionType.Orthographic:
{
Calculate2DMovement();
break;
}
case ProjectionType.Perspective:
{
Calculate3DMovement();
break;
}
}
}
// Render the current object
// Tick the actor, advancing any time-dependent behaviour
var tickingRenderable = this.RenderTarget as ITickingActor;
tickingRenderable?.Tick(this.DeltaTime);
// Update the camera with new parameters
_camera.ViewportHeight = widgetHeight;
_camera.ViewportWidth = widgetWidth;
var view = _camera.GetViewMatrix();
var projection = _camera.GetProjectionMatrix();
if (this.RenderTarget.Projection == ProjectionType.Perspective)
{
_grid?.Render(view, projection, _camera);
}
// Then render the visual component
this.RenderTarget.Render(view, projection, _camera);
}
}