public GBufferRenderer(IGraphicsService graphicsService, SceneNodeRenderer sceneNodeRenderer, DecalRenderer decalRenderer)
{
_clearGBufferRenderer = new ClearGBufferRenderer(graphicsService);
_sceneNodeRenderer = sceneNodeRenderer;
_decalRenderer = decalRenderer;
// This filter is used to downsample the depth buffer (GBuffer0).
_downsampleFilter = PostProcessHelper.GetDownsampleFilter(graphicsService);
}
/// <summary>
/// Initializes a new instance of the <see cref="ShadowMapRenderer"/> class using the specified
/// scene node renderer.
/// </summary>
/// <param name="sceneNodeRenderer">
/// The renderer for shadow-casting objects. A <see cref="RenderCallback"/> is created
/// automatically which calls the specified renderer.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="sceneNodeRenderer"/> is <see langword="null"/>.
/// </exception>
public ShadowMapRenderer(SceneNodeRenderer sceneNodeRenderer)
{
if (sceneNodeRenderer == null)
{
throw new ArgumentNullException("sceneNodeRenderer");
}
_renderCallback = context =>
{
var query = context.Scene.Query <ShadowCasterQuery>(context.CameraNode, context);
if (query.ShadowCasters.Count == 0)
{
return(false);
}
sceneNodeRenderer.Render(query.ShadowCasters, context);
return(true);
};
AddDefaultRenderers(_renderCallback);
}
/// <summary>
/// Initializes a new instance of the <see cref="ShadowMapRenderer"/> class using the specified
/// scene node renderer.
/// </summary>
/// <param name="sceneNodeRenderer">
/// The renderer for shadow-casting objects. A <see cref="RenderCallback"/> is created
/// automatically which calls the specified renderer.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="sceneNodeRenderer"/> is <see langword="null"/>.
/// </exception>
public ShadowMapRenderer(SceneNodeRenderer sceneNodeRenderer)
{
if (sceneNodeRenderer == null)
throw new ArgumentNullException("sceneNodeRenderer");
_renderCallback = context =>
{
var query = context.Scene.Query<ShadowCasterQuery>(context.CameraNode, context);
if (query.ShadowCasters.Count == 0)
return false;
sceneNodeRenderer.Render(query.ShadowCasters, context);
return true;
};
AddDefaultRenderers(_renderCallback);
}
public void Render(IList<SceneNode> occluders, LightNode lightNode, SceneNodeRenderer renderer, RenderContext context)
{
if (context == null)
throw new ArgumentNullException("context");
context.ThrowIfCameraMissing();
// ----- Sort occluders by type: IOcclusionProxy vs. SceneNode
SortOccluders(occluders, renderer, context);
Statistics.Occluders = _occlusionProxies.Count + _sceneNodes.Count;
// ----- Update all IOcclusionProxy in background.
if (_occlusionProxies.Count > 0)
{
if (EnableMultithreading)
_updateTask = Parallel.Start(_updateOcclusionProxies);
else
UpdateOcclusionProxies();
}
// ----- Backup render state.
var originalRenderTarget = context.RenderTarget;
var originalViewport = context.Viewport;
var graphicsService = context.GraphicsService;
var graphicsDevice = graphicsService.GraphicsDevice;
var originalRenderState = new RenderStateSnapshot(graphicsDevice);
// ----- Camera properties
var cameraNode = context.CameraNode;
Matrix cameraView = (Matrix)cameraNode.View;
var cameraProjection = cameraNode.Camera.Projection;
Matrix cameraViewProjection = cameraView * cameraProjection;
if (lightNode == null)
{
_lightHzbAvailable = false;
}
else
{
// ----- Render light HZB.
_lightHzbAvailable = true;
var shadow = lightNode.Shadow as CascadedShadow;
if (shadow == null)
throw new ArgumentException("LightNode expected to have a CascadedShadow.", "lightNode");
// Set up orthographic camera similar to CascadedShadowMapRenderer.
context.CameraNode = _orthographicCameraNode;
// Part of camera frustum covered by shadow map.
var maxShadowDistance = shadow.Distances[shadow.NumberOfCascades - 1];
_splitVolume.SetFieldOfView(cameraProjection.FieldOfViewY, cameraProjection.AspectRatio, cameraProjection.Near, Math.Min(cameraProjection.Far, maxShadowDistance));
// Find the bounding sphere of the camera frustum.
Vector3F center;
float radius;
GetBoundingSphere(_splitVolume, out center, out radius);
Matrix33F orientation = lightNode.PoseWorld.Orientation;
Vector3F lightBackward = orientation.GetColumn(2);
var orthographicProjection = (OrthographicProjection)_orthographicCameraNode.Camera.Projection;
// Create a tight orthographic frustum around the cascade's bounding sphere.
orthographicProjection.SetOffCenter(-radius, radius, -radius, radius, 0, 2 * radius);
center = cameraNode.PoseWorld.ToWorldPosition(center);
Vector3F cameraPosition = center + radius * lightBackward;
Pose frustumPose = new Pose(cameraPosition, orientation);
// For rendering the shadow map, move near plane back by MinLightDistance
// to catch occluders in front of the cascade.
orthographicProjection.Near = -shadow.MinLightDistance;
_orthographicCameraNode.PoseWorld = frustumPose;
Pose lightView = frustumPose.Inverse;
Matrix lightViewProjection = (Matrix)lightView * orthographicProjection;
_parameterCameraViewProj.SetValue(lightViewProjection);
_parameterCameraNear.SetValue(orthographicProjection.Near);
_parameterCameraFar.SetValue(orthographicProjection.Far);
RenderOccluders(renderer, context);
CreateDepthHierarchy(_lightHzb, context);
// Set effect parameters for use in Query().
_lightAabb = _orthographicCameraNode.Aabb;
_parameterLightViewProj.SetValue(lightViewProjection);
_parameterLightToCamera.SetValue(Matrix.Invert(lightViewProjection) * cameraViewProjection);
context.CameraNode = cameraNode;
}
// ----- Render camera HZB.
// Set camera parameters. (These effect parameters are also needed in Query()!)
_cameraAabb = cameraNode.Aabb;
_parameterCameraViewProj.SetValue(cameraViewProjection);
_parameterCameraNear.SetValue(cameraProjection.Near);
_parameterCameraFar.SetValue(cameraProjection.Far);
var lodCameraNode = context.LodCameraNode;
if (lodCameraNode != null)
{
// Enable distance culling.
_parameterCameraPosition.SetValue((Vector3)lodCameraNode.PoseWorld.Position);
float yScale = Math.Abs(lodCameraNode.Camera.Projection.ToMatrix44F().M11);
_parameterNormalizationFactor.SetValue(1.0f / yScale * cameraNode.LodBias * context.LodBias);
}
else
{
// Disable distance culling.
_parameterCameraPosition.SetValue(new Vector3());
_parameterNormalizationFactor.SetValue(0);
}
RenderOccluders(renderer, context);
CreateDepthHierarchy(_cameraHzb, context);
_sceneNodes.Clear();
_occlusionProxies.Clear();
// Restore render state.
graphicsDevice.SetRenderTarget(null);
originalRenderState.Restore();
context.RenderTarget = originalRenderTarget;
context.Viewport = originalViewport;
}
public void Render(IList<SceneNode> occluders, SceneNodeRenderer renderer, RenderContext context)
{
Render(occluders, null, renderer, context);
}
/// <summary>
/// Sorts occluders by type (<see cref="IOcclusionProxy"/> vs. <see cref="SceneNode"/>).
/// </summary>
/// <param name="nodes">The nodes.</param>
/// <param name="renderer">The renderer.</param>
/// <param name="context">The context.</param>
private void SortOccluders(IList<SceneNode> nodes, SceneNodeRenderer renderer, RenderContext context)
{
Debug.Assert(_occlusionProxies.Count == 0, "The list of IOcclusionProxy has not been cleared.");
Debug.Assert(_sceneNodes.Count == 0, "The list of SceneNodes has not been cleared.");
if (nodes == null)
return;
int numberOfNodes = nodes.Count;
if (renderer == null)
{
// Search only for IOcclusionProxy.
for (int i = 0; i < numberOfNodes; i++)
{
var node = nodes[i];
if (node == null)
continue;
var occlusionProxy = node as IOcclusionProxy;
if (occlusionProxy != null && occlusionProxy.HasOccluder)
_occlusionProxies.Add(occlusionProxy);
}
}
else
{
// Search for IOcclusionProxy and renderable scene nodes.
for (int i = 0; i < numberOfNodes; i++)
{
var node = nodes[i];
if (node == null)
continue;
var occlusionProxy = node as IOcclusionProxy;
if (occlusionProxy != null && occlusionProxy.HasOccluder)
_occlusionProxies.Add(occlusionProxy);
else if (renderer.CanRender(node, context))
_sceneNodes.Add(node);
}
}
}
/// <summary>
/// Renders the occluders.
/// </summary>
/// <param name="renderer">
/// Optional: A <see cref="SceneNodeRenderer"/> for rendering custom scene nodes into the
/// occlusion buffer.
/// </param>
/// <param name="context">The context.</param>
private void RenderOccluders(SceneNodeRenderer renderer, RenderContext context)
{
// ----- Clear occlusion buffer.
var graphicsService = context.GraphicsService;
var graphicsDevice = graphicsService.GraphicsDevice;
graphicsDevice.SetRenderTarget(_hzbLevels[0]);
context.RenderTarget = _hzbLevels[0];
context.Viewport = graphicsDevice.Viewport;
graphicsDevice.Clear(Color.White);
// ----- Render scene nodes using custom scene node renderer.
if (renderer != null && _sceneNodes.Count > 0)
{
graphicsDevice.DepthStencilState = DepthStencilState.Default;
graphicsDevice.RasterizerState = RasterizerState.CullNone;
graphicsDevice.BlendState = BlendState.Opaque;
renderer.Render(_sceneNodes, context);
}
// ----- Render all IOcclusionProxy.
if (EnableMultithreading)
_updateTask.Wait();
graphicsDevice.DepthStencilState = DepthStencilState.Default;
graphicsDevice.RasterizerState = RasterizerState.CullNone;
graphicsDevice.BlendState = BlendState.Opaque;
_effect.CurrentTechnique = _techniqueOccluder;
_techniqueOccluder.Passes[0].Apply();
// Go through list of occluders and submit triangles to render batch.
int numberOfOccluders = _occlusionProxies.Count;
for (int i = 0; i < numberOfOccluders; i++)
{
var data = _occlusionProxies[i].GetOccluder();
int vertexBufferIndex, indexBufferIndex;
_renderBatch.Submit(PrimitiveType.TriangleList, data.Vertices.Length, data.Indices.Length, out vertexBufferIndex, out indexBufferIndex);
// Copy triangle vertices.
data.Vertices.CopyTo(_renderBatch.Vertices, vertexBufferIndex);
// Adjust and copy triangle indices.
for (int j = 0; j < data.Indices.Length; j++, indexBufferIndex++)
_renderBatch.Indices[indexBufferIndex] = (ushort)(vertexBufferIndex + data.Indices[j]);
}
_renderBatch.Flush();
}
