/// <summary>
/// Renders the current frame to each holographic display, according to the
/// current application and spatial positioning state. Returns true if the
/// frame was rendered to at least one display.
/// </summary>
public bool Render(ref HolographicFrame holographicFrame)
{
// Don't try to render anything before the first Update.
if (timer.FrameCount == 0)
{
return false;
}
// Up-to-date frame predictions enhance the effectiveness of image stablization and
// allow more accurate positioning of holograms.
holographicFrame.UpdateCurrentPrediction();
HolographicFramePrediction prediction = holographicFrame.CurrentPrediction;
// Lock the set of holographic camera resources, then draw to each camera
// in this frame.
return deviceResources.UseHolographicCameraResources(
(Dictionary<uint, CameraResources> cameraResourceDictionary) =>
{
bool atLeastOneCameraRendered = false;
foreach (var cameraPose in prediction.CameraPoses)
{
// This represents the device-based resources for a HolographicCamera.
CameraResources cameraResources = cameraResourceDictionary[cameraPose.HolographicCamera.Id];
// Get the device context.
var context = deviceResources.D3DDeviceContext;
var renderTargetView = cameraResources.BackBufferRenderTargetView;
var depthStencilView = cameraResources.DepthStencilView;
// Set render targets to the current holographic camera.
context.OutputMerger.SetRenderTargets(depthStencilView, renderTargetView);
// Clear the back buffer and depth stencil view.
SharpDX.Mathematics.Interop.RawColor4 transparent = new SharpDX.Mathematics.Interop.RawColor4(0.0f, 0.0f, 0.0f, 0.0f);
context.ClearRenderTargetView(renderTargetView, transparent);
context.ClearDepthStencilView(
depthStencilView,
SharpDX.Direct3D11.DepthStencilClearFlags.Depth | SharpDX.Direct3D11.DepthStencilClearFlags.Stencil,
1.0f,
0);
// The view and projection matrices for each holographic camera will change
// every frame. This function refreshes the data in the constant buffer for
// the holographic camera indicated by cameraPose.
cameraResources.UpdateViewProjectionBuffer(deviceResources, cameraPose, referenceFrame.CoordinateSystem);
// Attach the view/projection constant buffer for this camera to the graphics pipeline.
bool cameraActive = cameraResources.AttachViewProjectionBuffer(deviceResources);
// Only render world-locked content when positional tracking is active.
if (cameraActive)
{
quadRenderer.RenderRGB(textRenderer.Texture);
}
atLeastOneCameraRendered = true;
}
return atLeastOneCameraRendered;
});
}
