private Vector2 ComputeCascadeSplits(RenderContext context, ShadowMapRenderer shadowContext, ref LightShadowMapTexture lightShadowMap)
{
var shadow = (LightDirectionalShadowMap)lightShadowMap.Shadow;
var cameraNear = shadowContext.Camera.NearClipPlane;
var cameraFar = shadowContext.Camera.FarClipPlane;
var cameraRange = cameraFar - cameraNear;
var minDistance = cameraNear + LightDirectionalShadowMap.DepthRangeParameters.DefaultMinDistance;
var maxDistance = cameraNear + LightDirectionalShadowMap.DepthRangeParameters.DefaultMaxDistance;
if (shadow.DepthRange.IsAutomatic)
{
var depthReadBack = DepthReadback.GetDepthReadback(context);
if (depthReadBack.IsResultAvailable)
{
var depthMinMax = depthReadBack.DepthMinMax;
minDistance = ToLinearDepth(depthMinMax.X, ref shadowContext.Camera.ProjectionMatrix);
// Reserve 1/3 of the guard distance for the min distance
minDistance = Math.Max(cameraNear, minDistance - shadow.DepthRange.GuardDistance / 3);
// Reserve 2/3 of the guard distance for the max distance
var guardMaxDistance = minDistance + shadow.DepthRange.GuardDistance * 2 / 3;
maxDistance = ToLinearDepth(depthMinMax.Y, ref shadowContext.Camera.ProjectionMatrix);
maxDistance = Math.Max(maxDistance, guardMaxDistance);
}
}
else
{
minDistance = cameraNear + shadow.DepthRange.ManualMinDistance;
maxDistance = cameraNear + shadow.DepthRange.ManualMaxDistance;
}
var manualPartitionMode = shadow.PartitionMode as LightDirectionalShadowMap.PartitionManual;
var logarithmicPartitionMode = shadow.PartitionMode as LightDirectionalShadowMap.PartitionLogarithmic;
if (logarithmicPartitionMode != null)
{
var minZ = minDistance;
var maxZ = maxDistance;
var range = maxZ - minZ;
var ratio = maxZ / minZ;
var logRatio = MathUtil.Clamp(1.0f - logarithmicPartitionMode.PSSMFactor, 0.0f, 1.0f);
for (int cascadeLevel = 0; cascadeLevel < lightShadowMap.CascadeCount; ++cascadeLevel)
{
// Compute cascade split (between znear and zfar)
float distrib = (float)(cascadeLevel + 1) / lightShadowMap.CascadeCount;
float logZ = (float)(minZ * Math.Pow(ratio, distrib));
float uniformZ = minZ + range * distrib;
float distance = MathUtil.Lerp(uniformZ, logZ, logRatio);
cascadeSplitRatios[cascadeLevel] = distance;
}
}
else if (manualPartitionMode != null)
{
if (lightShadowMap.CascadeCount == 1)
{
cascadeSplitRatios[0] = minDistance + manualPartitionMode.SplitDistance1 * maxDistance;
}
else if (lightShadowMap.CascadeCount == 2)
{
cascadeSplitRatios[0] = minDistance + manualPartitionMode.SplitDistance1 * maxDistance;
cascadeSplitRatios[1] = minDistance + manualPartitionMode.SplitDistance3 * maxDistance;
}
else if (lightShadowMap.CascadeCount == 4)
{
cascadeSplitRatios[0] = minDistance + manualPartitionMode.SplitDistance0 * maxDistance;
cascadeSplitRatios[1] = minDistance + manualPartitionMode.SplitDistance1 * maxDistance;
cascadeSplitRatios[2] = minDistance + manualPartitionMode.SplitDistance2 * maxDistance;
cascadeSplitRatios[3] = minDistance + manualPartitionMode.SplitDistance3 * maxDistance;
}
}
// Convert distance splits to ratios cascade in the range [0, 1]
for (int i = 0; i < cascadeSplitRatios.Length; i++)
{
cascadeSplitRatios[i] = (cascadeSplitRatios[i] - cameraNear) / cameraRange;
}
return new Vector2(minDistance, maxDistance);
}
public override void Render(RenderContext context, ShadowMapRenderer shadowMapRenderer, LightShadowMapTexture lightShadowMap)
{
var shadow = (LightDirectionalShadowMap)lightShadowMap.Shadow;
// TODO: Min and Max distance can be auto-computed from readback from Z buffer
var camera = shadowMapRenderer.Camera;
var shadowCamera = shadowMapRenderer.ShadowCamera;
var viewToWorld = camera.ViewMatrix;
viewToWorld.Invert();
// Update the frustum infos
UpdateFrustum(shadowMapRenderer.Camera);
// Computes the cascade splits
var minMaxDistance = ComputeCascadeSplits(context, shadowMapRenderer, ref lightShadowMap);
var direction = lightShadowMap.LightComponent.Direction;
// Fake value
// It will be setup by next loop
Vector3 side = Vector3.UnitX;
Vector3 upDirection = Vector3.UnitX;
// Select best Up vector
// TODO: User preference?
foreach (var vectorUp in VectorUps)
{
if (Math.Abs(Vector3.Dot(direction, vectorUp)) < (1.0 - 0.0001))
{
side = Vector3.Normalize(Vector3.Cross(vectorUp, direction));
upDirection = Vector3.Normalize(Vector3.Cross(direction, side));
break;
}
}
int cascadeCount = lightShadowMap.CascadeCount;
// Get new shader data from pool
LightDirectionalShadowMapShaderData shaderData;
if (cascadeCount == 1)
{
shaderData = shaderDataPoolCascade1.Add();
}
else if (cascadeCount == 2)
{
shaderData = shaderDataPoolCascade2.Add();
}
else
{
shaderData = shaderDataPoolCascade4.Add();
}
lightShadowMap.ShaderData = shaderData;
shaderData.Texture = lightShadowMap.Atlas.Texture;
shaderData.DepthBias = shadow.BiasParameters.DepthBias;
shaderData.OffsetScale = shadow.BiasParameters.NormalOffsetScale;
// Push a new graphics state
var graphicsDevice = context.GraphicsDevice;
graphicsDevice.PushState();
float splitMaxRatio = (minMaxDistance.X - camera.NearClipPlane) / (camera.FarClipPlane - camera.NearClipPlane);
for (int cascadeLevel = 0; cascadeLevel < cascadeCount; ++cascadeLevel)
{
// Calculate frustum corners for this cascade
var splitMinRatio = splitMaxRatio;
splitMaxRatio = cascadeSplitRatios[cascadeLevel];
for (int j = 0; j < 4; j++)
{
// Calculate frustum in WS and VS
var frustumRange = frustumCornersWS[j + 4] - frustumCornersWS[j];
cascadeFrustumCornersWS[j] = frustumCornersWS[j] + frustumRange * splitMinRatio;
cascadeFrustumCornersWS[j + 4] = frustumCornersWS[j] + frustumRange * splitMaxRatio;
frustumRange = frustumCornersVS[j + 4] - frustumCornersVS[j];
cascadeFrustumCornersVS[j] = frustumCornersVS[j] + frustumRange * splitMinRatio;
cascadeFrustumCornersVS[j + 4] = frustumCornersVS[j] + frustumRange * splitMaxRatio;
}
Vector3 cascadeMinBoundLS;
Vector3 cascadeMaxBoundLS;
Vector3 target;
if (!shadow.DepthRange.IsAutomatic && (shadow.StabilizationMode == LightShadowMapStabilizationMode.ViewSnapping || shadow.StabilizationMode == LightShadowMapStabilizationMode.ProjectionSnapping))
{
// Make sure we are using the same direction when stabilizing
var boundingVS = BoundingSphere.FromPoints(cascadeFrustumCornersVS);
// Compute bounding box center & radius
target = Vector3.TransformCoordinate(boundingVS.Center, viewToWorld);
var radius = boundingVS.Radius;
//if (shadow.AutoComputeMinMax)
//{
// var snapRadius = (float)Math.Ceiling(radius / snapRadiusValue) * snapRadiusValue;
// Debug.WriteLine("Radius: {0} SnapRadius: {1} (snap: {2})", radius, snapRadius, snapRadiusValue);
// radius = snapRadius;
//}
cascadeMaxBoundLS = new Vector3(radius, radius, radius);
cascadeMinBoundLS = -cascadeMaxBoundLS;
if (shadow.StabilizationMode == LightShadowMapStabilizationMode.ViewSnapping)
{
// Snap camera to texel units (so that shadow doesn't jitter when light doesn't change direction but camera is moving)
// Technique from ShaderX7 - Practical Cascaded Shadows Maps - p310-311
var shadowMapHalfSize = lightShadowMap.Size * 0.5f;
float x = (float)Math.Ceiling(Vector3.Dot(target, upDirection) * shadowMapHalfSize / radius) * radius / shadowMapHalfSize;
float y = (float)Math.Ceiling(Vector3.Dot(target, side) * shadowMapHalfSize / radius) * radius / shadowMapHalfSize;
float z = Vector3.Dot(target, direction);
//target = up * x + side * y + direction * R32G32B32_Float.Dot(target, direction);
target = upDirection * x + side * y + direction * z;
}
}
else
{
var cascadeBoundWS = BoundingBox.FromPoints(cascadeFrustumCornersWS);
target = cascadeBoundWS.Center;
// Computes the bouding box of the frustum cascade in light space
var lightViewMatrix = Matrix.LookAtLH(cascadeBoundWS.Center, cascadeBoundWS.Center + direction, upDirection);
cascadeMinBoundLS = new Vector3(float.MaxValue);
cascadeMaxBoundLS = new Vector3(-float.MaxValue);
for (int i = 0; i < cascadeFrustumCornersWS.Length; i++)
{
Vector3 cornerViewSpace;
Vector3.TransformCoordinate(ref cascadeFrustumCornersWS[i], ref lightViewMatrix, out cornerViewSpace);
cascadeMinBoundLS = Vector3.Min(cascadeMinBoundLS, cornerViewSpace);
cascadeMaxBoundLS = Vector3.Max(cascadeMaxBoundLS, cornerViewSpace);
}
// TODO: Adjust orthoSize by taking into account filtering size
}
// Update the shadow camera
shadowCamera.ViewMatrix = Matrix.LookAtLH(target + direction * cascadeMinBoundLS.Z, target, upDirection); // View;;
shadowCamera.ProjectionMatrix = Matrix.OrthoOffCenterLH(cascadeMinBoundLS.X, cascadeMaxBoundLS.X, cascadeMinBoundLS.Y, cascadeMaxBoundLS.Y, 0.0f, cascadeMaxBoundLS.Z - cascadeMinBoundLS.Z); // Projection
shadowCamera.Update();
// Stabilize the Shadow matrix on the projection
if (shadow.StabilizationMode == LightShadowMapStabilizationMode.ProjectionSnapping)
{
var shadowPixelPosition = shadowCamera.ViewProjectionMatrix.TranslationVector * lightShadowMap.Size * 0.5f;
shadowPixelPosition.Z = 0;
var shadowPixelPositionRounded = new Vector3((float)Math.Round(shadowPixelPosition.X), (float)Math.Round(shadowPixelPosition.Y), 0.0f);
var shadowPixelOffset = new Vector4(shadowPixelPositionRounded - shadowPixelPosition, 0.0f);
shadowPixelOffset *= 2.0f / lightShadowMap.Size;
shadowCamera.ProjectionMatrix.Row4 += shadowPixelOffset;
shadowCamera.Update();
}
// Cascade splits in light space using depth: Store depth on first CascaderCasterMatrix in last column of each row
shaderData.CascadeSplits[cascadeLevel] = MathUtil.Lerp(camera.NearClipPlane, camera.FarClipPlane, cascadeSplitRatios[cascadeLevel]);
var shadowMapRectangle = lightShadowMap.GetRectangle(cascadeLevel);
var cascadeTextureCoords = new Vector4((float)shadowMapRectangle.Left / lightShadowMap.Atlas.Width,
(float)shadowMapRectangle.Top / lightShadowMap.Atlas.Height,
(float)shadowMapRectangle.Right / lightShadowMap.Atlas.Width,
(float)shadowMapRectangle.Bottom / lightShadowMap.Atlas.Height);
//// Add border (avoid using edges due to bilinear filtering and blur)
//var borderSizeU = VsmBlurSize / lightShadowMap.Atlas.Width;
//var borderSizeV = VsmBlurSize / lightShadowMap.Atlas.Height;
//cascadeTextureCoords.X += borderSizeU;
//cascadeTextureCoords.Y += borderSizeV;
//cascadeTextureCoords.Z -= borderSizeU;
//cascadeTextureCoords.W -= borderSizeV;
float leftX = (float)lightShadowMap.Size / lightShadowMap.Atlas.Width * 0.5f;
float leftY = (float)lightShadowMap.Size / lightShadowMap.Atlas.Height * 0.5f;
float centerX = 0.5f * (cascadeTextureCoords.X + cascadeTextureCoords.Z);
float centerY = 0.5f * (cascadeTextureCoords.Y + cascadeTextureCoords.W);
// Compute receiver view proj matrix
Matrix adjustmentMatrix = Matrix.Scaling(leftX, -leftY, 1.0f) * Matrix.Translation(centerX, centerY, 0.0f);
// Calculate View Proj matrix from World space to Cascade space
Matrix.Multiply(ref shadowCamera.ViewProjectionMatrix, ref adjustmentMatrix, out shaderData.WorldToShadowCascadeUV[cascadeLevel]);
// Render to the atlas
lightShadowMap.Atlas.RenderFrame.Activate(context);
graphicsDevice.SetViewport(new Viewport(shadowMapRectangle.X, shadowMapRectangle.Y, shadowMapRectangle.Width, shadowMapRectangle.Height));
// Render the scene for this cascade
shadowMapRenderer.RenderCasters(context, lightShadowMap.LightComponent.CullingMask);
//// Copy texture coords with border
//cascades[cascadeLevel].CascadeLevels.CascadeTextureCoordsBorder = cascadeTextureCoords;
}
graphicsDevice.PopState();
}
private static void PrepareLightGroups(RenderDrawContext context, FastList<RenderView> renderViews, RenderView renderView, RenderViewLightData renderViewData, ShadowMapRenderer shadowMapRenderer, EntityGroup group)
{
foreach (var activeRenderer in renderViewData.ActiveRenderers)
{
// Find lights
var lightRenderer = activeRenderer.LightRenderer;
var lightCollection = activeRenderer.LightGroup.FindLightCollectionByGroup(group);
var processLightsParameters = new LightGroupRendererBase.ProcessLightsParameters
{
Context = context,
ViewIndex = renderViewData.ViewIndex,
View = renderView,
Views = renderViews,
LightCollection = lightCollection,
LightType = activeRenderer.LightGroup.LightType,
LightStart = 0,
LightEnd = lightCollection.Count,
ShadowMapRenderer = shadowMapRenderer,
ShadowMapTexturesPerLight = renderViewData.LightComponentsWithShadows,
};
lightRenderer.ProcessLights(processLightsParameters);
}
}
protected override void DrawCore(RenderContext context)
{
modelProcessor = SceneInstance.GetCurrent(context).GetProcessor<ModelProcessor>();
lightProcessor = SceneInstance.GetCurrent(context).GetProcessor<LightProcessor>();
// No light processors means no light in the scene, so we can early exit
if (lightProcessor == null || modelProcessor == null)
{
return;
}
// Not in the context of a SceneCameraRenderer? just exit
sceneCameraRenderer = context.Tags.Get(SceneCameraRenderer.Current);
sceneCamera = context.Tags.Get(CameraComponentRenderer.Current);
if (sceneCameraRenderer == null || sceneCamera == null)
{
return;
}
sceneCullingMask = sceneCameraRenderer.CullingMask;
// Setup the callback on the ModelRenderer and shadow map LightGroupRenderer
if (!isModelComponentRendererSetup)
{
// TODO: Check if we could discover declared renderers in a better way than just hacking the tags of a component
var modelRenderer = ModelComponentRenderer.GetAttached(sceneCameraRenderer);
if (modelRenderer == null)
{
return;
}
modelRenderer.Callbacks.PreRenderModel += PrepareRenderModelForRendering;
modelRenderer.Callbacks.PreRenderMesh += PreRenderMesh;
// TODO: Make this pluggable
// TODO: Shadows should work on mobile platforms
if (context.GraphicsDevice.Features.Profile >= GraphicsProfile.Level_10_0
&& (Platform.Type == PlatformType.Windows || Platform.Type == PlatformType.WindowsStore || Platform.Type == PlatformType.Windows10))
{
shadowMapRenderer = new ShadowMapRenderer(modelRenderer.EffectName);
shadowMapRenderer.Renderers.Add(typeof(LightDirectional), new LightDirectionalShadowMapRenderer());
shadowMapRenderer.Renderers.Add(typeof(LightSpot), new LightSpotShadowMapRenderer());
}
isModelComponentRendererSetup = true;
}
// Collect all visible lights
CollectVisibleLights();
// Draw shadow maps
if (shadowMapRenderer != null)
shadowMapRenderer.Draw(context, visibleLightsWithShadows);
// Prepare active renderers in an ordered list (by type and shadow on/off)
CollectActiveLightRenderers(context);
currentModelLightShadersPermutationEntry = null;
currentModelShadersParameters = null;
currentShadowReceiver = true;
// Clear the cache of parameter entries
lightParameterEntries.Clear();
parameterCollectionEntryPool.Clear();
// Clear association between model and lights
modelToLights.Clear();
// Clear all data generated by shader entries
foreach (var shaderEntry in shaderEntries)
{
shaderEntry.Value.ResetGroupDatas();
}
}
public override void Collect(RenderContext context, ShadowMapRenderer shadowMapRenderer, LightShadowMapTexture lightShadowMap)
{
// TODO: Min and Max distance can be auto-computed from readback from Z buffer
var shadow = (LightStandardShadowMap)lightShadowMap.Shadow;
// Computes the cascade splits
var lightComponent = lightShadowMap.LightComponent;
var spotLight = (LightSpot)lightComponent.Type;
var position = lightComponent.Position;
var direction = lightComponent.Direction;
var target = position + spotLight.Range * direction;
var orthoSize = spotLight.LightRadiusAtTarget;
// Fake value
// It will be setup by next loop
Vector3 side = Vector3.UnitX;
Vector3 upDirection = Vector3.UnitX;
// Select best Up vector
// TODO: User preference?
foreach (var vectorUp in VectorUps)
{
if (Vector3.Dot(direction, vectorUp) < (1.0 - 0.0001))
{
side = Vector3.Normalize(Vector3.Cross(vectorUp, direction));
upDirection = Vector3.Normalize(Vector3.Cross(direction, side));
break;
}
}
// Get new shader data from pool
var shaderData = shaderDataPool.Add();
lightShadowMap.ShaderData = shaderData;
shaderData.Texture = lightShadowMap.Atlas.Texture;
shaderData.DepthBias = shadow.BiasParameters.DepthBias;
shaderData.OffsetScale = shadow.BiasParameters.NormalOffsetScale;
// Update the shadow camera
var viewMatrix = Matrix.LookAtLH(position, target, upDirection); // View;;
// TODO: Calculation of near and far is hardcoded/approximated. We should find a better way to calculate it.
var projectionMatrix = Matrix.PerspectiveFovLH(spotLight.AngleOuterInRadians, 1.0f, 0.01f, spotLight.Range * 2.0f); // Perspective Projection for spotlights
Matrix viewProjectionMatrix;
Matrix.Multiply(ref viewMatrix, ref projectionMatrix, out viewProjectionMatrix);
var shadowMapRectangle = lightShadowMap.GetRectangle(0);
var cascadeTextureCoords = new Vector4((float)shadowMapRectangle.Left / lightShadowMap.Atlas.Width,
(float)shadowMapRectangle.Top / lightShadowMap.Atlas.Height,
(float)shadowMapRectangle.Right / lightShadowMap.Atlas.Width,
(float)shadowMapRectangle.Bottom / lightShadowMap.Atlas.Height);
//// Add border (avoid using edges due to bilinear filtering and blur)
//var borderSizeU = VsmBlurSize / lightShadowMap.Atlas.Width;
//var borderSizeV = VsmBlurSize / lightShadowMap.Atlas.Height;
//cascadeTextureCoords.X += borderSizeU;
//cascadeTextureCoords.Y += borderSizeV;
//cascadeTextureCoords.Z -= borderSizeU;
//cascadeTextureCoords.W -= borderSizeV;
float leftX = (float)lightShadowMap.Size / lightShadowMap.Atlas.Width * 0.5f;
float leftY = (float)lightShadowMap.Size / lightShadowMap.Atlas.Height * 0.5f;
float centerX = 0.5f * (cascadeTextureCoords.X + cascadeTextureCoords.Z);
float centerY = 0.5f * (cascadeTextureCoords.Y + cascadeTextureCoords.W);
// Compute receiver view proj matrix
Matrix adjustmentMatrix = Matrix.Scaling(leftX, -leftY, 1.0f) * Matrix.Translation(centerX, centerY, 0.0f);
// Calculate View Proj matrix from World space to Cascade space
Matrix.Multiply(ref viewProjectionMatrix, ref adjustmentMatrix, out shaderData.WorldToShadowCascadeUV);
shaderData.ViewMatrix = viewMatrix;
shaderData.ProjectionMatrix = projectionMatrix;
}
public override void Collect()
{
// Initialize shadow map renderer
if (!isShadowMapRendererSetUp && ShadowMapRenderStage != null)
{
// TODO: Shadow mapping is currently disabled in new render system
// TODO: Make this pluggable
// TODO: Shadows should work on mobile platforms
if (RenderSystem.RenderContextOld.GraphicsDevice.Features.RequestedProfile >= GraphicsProfile.Level_10_0)
{
ShadowMapRenderer = new ShadowMapRenderer(RenderSystem, ShadowMapRenderStage);
ShadowMapRenderer.Renderers.Add(typeof(LightDirectional), new LightDirectionalShadowMapRenderer());
ShadowMapRenderer.Renderers.Add(typeof(LightSpot), new LightSpotShadowMapRenderer());
}
isShadowMapRendererSetUp = true;
}
// Collect all visible lights
CollectVisibleLights();
// Prepare active renderers in an ordered list (by type and shadow on/off)
CollectActiveLightRenderers(RenderSystem.RenderContextOld);
// Collect shadow maps
ShadowMapRenderer?.Collect(RenderSystem.RenderContextOld, renderViewDatas);
}
public abstract void Render(RenderContext context, ShadowMapRenderer shadowMapRenderer, LightShadowMapTexture lightShadowMap);
public override void Render(RenderContext context, ShadowMapRenderer shadowMapRenderer, LightShadowMapTexture lightShadowMap)
{
// TODO: Min and Max distance can be auto-computed from readback from Z buffer
var shadow = (LightStandardShadowMap)lightShadowMap.Shadow;
var shadowCamera = shadowMapRenderer.ShadowCamera;
// Computes the cascade splits
var lightComponent = lightShadowMap.LightComponent;
var spotLight = (LightSpot)lightComponent.Type;
var position = lightComponent.Position;
var direction = lightComponent.Direction;
var target = position + spotLight.Range * direction;
var orthoSize = spotLight.LightRadiusAtTarget;
// Fake value
// It will be setup by next loop
Vector3 side = Vector3.UnitX;
Vector3 upDirection = Vector3.UnitX;
// Select best Up vector
// TODO: User preference?
foreach (var vectorUp in VectorUps)
{
if (Vector3.Dot(direction, vectorUp) < (1.0 - 0.0001))
{
side = Vector3.Normalize(Vector3.Cross(vectorUp, direction));
upDirection = Vector3.Normalize(Vector3.Cross(direction, side));
break;
}
}
// Get new shader data from pool
var shaderData = shaderDataPool.Add();
lightShadowMap.ShaderData = shaderData;
shaderData.Texture = lightShadowMap.Atlas.Texture;
shaderData.DepthBias = shadow.BiasParameters.DepthBias;
shaderData.OffsetScale = shadow.BiasParameters.NormalOffsetScale;
var graphicsDevice = context.GraphicsDevice;
graphicsDevice.PushState();
// Update the shadow camera
shadowCamera.ViewMatrix = Matrix.LookAtLH(position, target, upDirection); // View;;
shadowCamera.ProjectionMatrix = Matrix.OrthoOffCenterLH(-orthoSize, orthoSize, -orthoSize, orthoSize, 0.0f, spotLight.Range); // Projection
shadowCamera.Update();
var shadowMapRectangle = lightShadowMap.GetRectangle(0);
var cascadeTextureCoords = new Vector4((float)shadowMapRectangle.Left / lightShadowMap.Atlas.Width,
(float)shadowMapRectangle.Top / lightShadowMap.Atlas.Height,
(float)shadowMapRectangle.Right / lightShadowMap.Atlas.Width,
(float)shadowMapRectangle.Bottom / lightShadowMap.Atlas.Height);
//// Add border (avoid using edges due to bilinear filtering and blur)
//var borderSizeU = VsmBlurSize / lightShadowMap.Atlas.Width;
//var borderSizeV = VsmBlurSize / lightShadowMap.Atlas.Height;
//cascadeTextureCoords.X += borderSizeU;
//cascadeTextureCoords.Y += borderSizeV;
//cascadeTextureCoords.Z -= borderSizeU;
//cascadeTextureCoords.W -= borderSizeV;
float leftX = (float)lightShadowMap.Size / lightShadowMap.Atlas.Width * 0.5f;
float leftY = (float)lightShadowMap.Size / lightShadowMap.Atlas.Height * 0.5f;
float centerX = 0.5f * (cascadeTextureCoords.X + cascadeTextureCoords.Z);
float centerY = 0.5f * (cascadeTextureCoords.Y + cascadeTextureCoords.W);
// Compute receiver view proj matrix
Matrix adjustmentMatrix = Matrix.Scaling(leftX, -leftY, 1.0f) * Matrix.Translation(centerX, centerY, 0.0f);
// Calculate View Proj matrix from World space to Cascade space
Matrix.Multiply(ref shadowCamera.ViewProjectionMatrix, ref adjustmentMatrix, out shaderData.WorldToShadowCascadeUV);
// Render to the atlas
lightShadowMap.Atlas.RenderFrame.Activate(context);
graphicsDevice.SetViewport(new Viewport(shadowMapRectangle.X, shadowMapRectangle.Y, shadowMapRectangle.Width, shadowMapRectangle.Height));
// Render the scene for this cascade
shadowMapRenderer.RenderCasters(context, lightShadowMap.LightComponent.CullingMask);
//// Copy texture coords with border
//cascades[cascadeLevel].CascadeLevels.CascadeTextureCoordsBorder = cascadeTextureCoords;
graphicsDevice.PopState();
}
protected override void DrawCore(RenderContext context)
{
modelProcessor = SceneInstance.GetCurrent(context).GetProcessor <ModelProcessor>();
lightProcessor = SceneInstance.GetCurrent(context).GetProcessor <LightProcessor>();
// No light processors means no light in the scene, so we can early exit
if (lightProcessor == null || modelProcessor == null)
{
return;
}
// Not in the context of a SceneCameraRenderer? just exit
sceneCameraRenderer = context.Tags.Get(SceneCameraRenderer.Current);
sceneCamera = context.Tags.Get(CameraComponentRenderer.Current);
if (sceneCameraRenderer == null || sceneCamera == null)
{
return;
}
sceneCullingMask = sceneCameraRenderer.CullingMask;
// Setup the callback on the ModelRenderer and shadow map LightGroupRenderer
if (!isModelComponentRendererSetup)
{
// TODO: Check if we could discover declared renderers in a better way than just hacking the tags of a component
var modelRenderer = ModelComponentRenderer.GetAttached(sceneCameraRenderer);
if (modelRenderer == null)
{
return;
}
modelRenderer.Callbacks.PreRenderModel += PrepareRenderModelForRendering;
modelRenderer.Callbacks.PreRenderMesh += PreRenderMesh;
// TODO: Make this pluggable
if (context.GraphicsDevice.Features.Profile >= GraphicsProfile.Level_10_0)
{
shadowMapRenderer = new ShadowMapRenderer(modelRenderer.EffectName);
shadowMapRenderer.Renderers.Add(typeof(LightDirectional), new LightDirectionalShadowMapRenderer());
shadowMapRenderer.Renderers.Add(typeof(LightSpot), new LightSpotShadowMapRenderer());
}
isModelComponentRendererSetup = true;
}
// Collect all visible lights
CollectVisibleLights();
// Draw shadow maps
if (shadowMapRenderer != null)
{
shadowMapRenderer.Draw(context, visibleLightsWithShadows);
}
// Prepare active renderers in an ordered list (by type and shadow on/off)
CollectActiveLightRenderers(context);
currentModelLightShadersPermutationEntry = null;
currentModelShadersParameters = null;
currentShadowReceiver = true;
// Clear the cache of parameter entries
lightParameterEntries.Clear();
parameterCollectionEntryPool.Clear();
// Clear association between model and lights
modelToLights.Clear();
// Clear all data generated by shader entries
foreach (var shaderEntry in shaderEntries)
{
shaderEntry.Value.ResetGroupDatas();
}
}
protected internal void RenderScene(CustomSceneQuery sceneQuery, RenderContext context,
bool doPostProcessing, bool renderLensFlares, bool renderDebugOutput, bool renderReticle)
{
var renderTargetPool = GraphicsService.RenderTargetPool;
var graphicsDevice = GraphicsService.GraphicsDevice;
var originalRenderTarget = context.RenderTarget;
var originalViewport = context.Viewport;
var originalSourceTexture = context.SourceTexture;
// All intermediate render targets have the size of the target viewport.
int width = context.Viewport.Width;
int height = context.Viewport.Height;
context.Viewport = new Viewport(0, 0, width, height);
// The render context can be used to share any data, for example:
// Store a shared RebuildZBufferRenderer in the context.
context.Data[RenderContextKeys.RebuildZBufferRenderer] = _rebuildZBufferRenderer;
// ----- G-Buffer Pass
// The GBufferRenderer creates context.GBuffer0 and context.GBuffer1.
_gBufferRenderer.Render(sceneQuery.RenderableNodes, sceneQuery.DecalNodes, context);
// ----- Shadow Pass
// The ShadowMapRenderer renders the shadow maps which are stored in the light nodes.
context.RenderPass = "******";
ShadowMapRenderer.Render(sceneQuery.Lights, context);
context.RenderPass = null;
// The ShadowMaskRenderer renders the shadows and stores them in one or more render
// targets ("shadows masks").
ShadowMaskRenderer.Render(sceneQuery.Lights, context);
RecycleShadowMaps(sceneQuery.Lights);
// ----- Light Buffer Pass
// The LightBufferRenderer creates context.LightBuffer0 (diffuse light) and
// context.LightBuffer1 (specular light).
LightBufferRenderer.Render(sceneQuery.Lights, context);
// Normally, we do not need the shadow masks anymore - except if we want to
// display them for debugging.
if (!VisualizeIntermediateRenderTargets)
{
ShadowMaskRenderer.RecycleShadowMasks();
}
// ----- Material Pass
if (DebugMode == DeferredGraphicsDebugMode.None)
{
// In the material pass we render all meshes and decals into a single full-screen
// render target. The shaders combine the material properties (diffuse texture, etc.)
// with the light buffer info.
context.RenderTarget =
renderTargetPool.Obtain2D(new RenderTargetFormat(width, height, false, SurfaceFormat.HdrBlendable,
DepthFormat.Depth24Stencil8));
graphicsDevice.SetRenderTarget(context.RenderTarget);
context.Viewport = graphicsDevice.Viewport;
graphicsDevice.Clear(new Color(3, 3, 3, 255));
graphicsDevice.DepthStencilState = DepthStencilState.Default;
graphicsDevice.RasterizerState = RasterizerState.CullCounterClockwise;
graphicsDevice.BlendState = BlendState.Opaque;
context.RenderPass = "******";
_opaqueMeshSceneRenderer.Render(sceneQuery.RenderableNodes, context);
_decalRenderer.Render(sceneQuery.DecalNodes, context);
context.RenderPass = null;
}
else
{
// For debugging:
// Ignore the material pass. Keep rendering into one of the light buffers
// to visualize only the lighting results.
if (DebugMode == DeferredGraphicsDebugMode.VisualizeDiffuseLightBuffer)
{
context.RenderTarget = context.LightBuffer0;
}
else
{
context.RenderTarget = context.LightBuffer1;
}
}
// The meshes rendered in the last step might use additional floating-point
// textures (e.g. the light buffers) in the different graphics texture stages.
// We reset the texture stages (setting all GraphicsDevice.Textures to null),
// otherwise XNA might throw exceptions.
graphicsDevice.ResetTextures();
// ----- Occlusion Queries
if (renderLensFlares)
{
_lensFlareRenderer.UpdateOcclusion(sceneQuery.LensFlareNodes, context);
}
// ----- Sky
_skyRenderer.Render(sceneQuery.SkyNodes, context);
// ----- Fog
_fogRenderer.Render(sceneQuery.FogNodes, context);
// ----- Forward Rendering of Alpha-Blended Meshes and Particles
graphicsDevice.DepthStencilState = DepthStencilState.DepthRead;
graphicsDevice.RasterizerState = RasterizerState.CullCounterClockwise;
graphicsDevice.BlendState = BlendState.AlphaBlend;
context.RenderPass = "******";
AlphaBlendSceneRenderer.Render(sceneQuery.RenderableNodes, context, RenderOrder.BackToFront);
context.RenderPass = null;
graphicsDevice.ResetTextures();
renderTargetPool.Recycle(context.SourceTexture);
context.SourceTexture = null;
_underwaterPostProcessor.Enabled = IsCameraUnderwater(sceneQuery, context.CameraNode);
// ----- Post Processors
context.SourceTexture = context.RenderTarget;
context.RenderTarget = originalRenderTarget;
context.Viewport = originalViewport;
if (doPostProcessing)
{
// The post-processors modify the scene image and the result is written into
// the final render target - which is usually the back buffer (but this could
// also be another off-screen render target used in another graphics screen).
PostProcessors.Process(context);
}
else
{
// Only copy the current render target to the final render target without post-processing.
graphicsDevice.SetRenderTarget(originalRenderTarget);
graphicsDevice.Viewport = originalViewport;
SpriteBatch.Begin(SpriteSortMode.Immediate, BlendState.Opaque, SamplerState.PointClamp, DepthStencilState.None, RasterizerState.CullNone);
SpriteBatch.Draw(context.SourceTexture, new Rectangle(0, 0, originalViewport.Width, originalViewport.Height), Color.White);
SpriteBatch.End();
}
renderTargetPool.Recycle((RenderTarget2D)context.SourceTexture);
context.SourceTexture = null;
// ----- Lens Flares
if (renderLensFlares)
{
_lensFlareRenderer.Render(sceneQuery.LensFlareNodes, context);
}
// ----- Debug Output
if (renderDebugOutput)
{
// ----- Optional: Restore the Z-Buffer
// Currently, the hardware depth buffer is not initialized with useful data because
// every time we change the render target, XNA deletes the depth buffer. If we want
// the debug rendering to use correct depth buffer, we can restore the depth buffer
// using the RebuildZBufferRenderer. If we remove this step, then the DebugRenderer
// graphics will overlay the whole 3D scene.
_rebuildZBufferRenderer.Render(context, true);
// Render debug info added by game objects.
DebugRenderer.Render(context);
// Render intermediate render targets for debugging.
// We do not use the public DebugRenderer here because the public DebugRenderer
// might not be cleared every frame (the game logic can choose how it wants to
// use the public renderer).
if (VisualizeIntermediateRenderTargets)
{
_internalDebugRenderer.DrawTexture(context.GBuffer0, new Rectangle(0, 0, 200, 200));
_internalDebugRenderer.DrawTexture(context.GBuffer1, new Rectangle(200, 0, 200, 200));
_internalDebugRenderer.DrawTexture(context.LightBuffer0, new Rectangle(400, 0, 200, 200));
_internalDebugRenderer.DrawTexture(context.LightBuffer1, new Rectangle(600, 0, 200, 200));
for (int i = 0; i < ShadowMaskRenderer.ShadowMasks.Count; i++)
{
var shadowMask = ShadowMaskRenderer.ShadowMasks[i];
if (shadowMask != null)
{
_internalDebugRenderer.DrawTexture(shadowMask, new Rectangle((i) * 200, 200, 200, 200));
}
}
_internalDebugRenderer.Render(context);
_internalDebugRenderer.Clear();
}
}
// ----- Draw Reticle
if (renderReticle && _sampleFramework.IsGuiVisible)
{
SpriteBatch.Begin(SpriteSortMode.Immediate, BlendState.AlphaBlend);
SpriteBatch.Draw(
_reticle,
new Vector2(originalViewport.Width / 2 - _reticle.Width / 2, originalViewport.Height / 2 - _reticle.Height / 2),
Color.Black);
SpriteBatch.End();
}
// ----- Clean-up
// It is very important to give every intermediate render target back to the
// render target pool!
renderTargetPool.Recycle(context.GBuffer0);
context.GBuffer0 = null;
renderTargetPool.Recycle(context.GBuffer1);
context.GBuffer1 = null;
renderTargetPool.Recycle((RenderTarget2D)context.Data[RenderContextKeys.DepthBufferHalf]);
context.Data.Remove(RenderContextKeys.DepthBufferHalf);
if (DebugMode != DeferredGraphicsDebugMode.VisualizeDiffuseLightBuffer)
{
renderTargetPool.Recycle(context.LightBuffer0);
}
context.LightBuffer0 = null;
if (DebugMode != DeferredGraphicsDebugMode.VisualizeSpecularLightBuffer)
{
renderTargetPool.Recycle(context.LightBuffer1);
}
context.LightBuffer1 = null;
ShadowMaskRenderer.RecycleShadowMasks();
context.Data.Remove(RenderContextKeys.RebuildZBufferRenderer);
context.SourceTexture = originalSourceTexture;
}
public DeferredGraphicsScreen(IServiceLocator services)
: base(services.GetInstance <IGraphicsService>())
{
_sampleFramework = services.GetInstance <SampleFramework>();
var contentManager = services.GetInstance <ContentManager>();
SpriteBatch = GraphicsService.GetSpriteBatch();
// Let's create the necessary scene node renderers:
TerrainRenderer = new TerrainRenderer(GraphicsService);
MeshRenderer = new MeshRenderer();
// The _opaqueMeshSceneRenderer combines all renderers for opaque
// (= not alpha blended) meshes.
_opaqueMeshSceneRenderer = new SceneRenderer();
_opaqueMeshSceneRenderer.Renderers.Add(TerrainRenderer);
_opaqueMeshSceneRenderer.Renderers.Add(MeshRenderer);
_decalRenderer = new DecalRenderer(GraphicsService);
_billboardRenderer = new BillboardRenderer(GraphicsService, 2048)
{
EnableSoftParticles = true,
// If you have an extreme amount of particles that cover the entire screen,
// you can turn on offscreen rendering to improve performance.
//EnableOffscreenRendering = true,
};
// The AlphaBlendSceneRenderer combines all renderers for transparent
// (= alpha blended) objects.
AlphaBlendSceneRenderer = new SceneRenderer();
AlphaBlendSceneRenderer.Renderers.Add(MeshRenderer);
AlphaBlendSceneRenderer.Renderers.Add(_billboardRenderer);
AlphaBlendSceneRenderer.Renderers.Add(new WaterRenderer(GraphicsService));
AlphaBlendSceneRenderer.Renderers.Add(new FogSphereRenderer(GraphicsService));
AlphaBlendSceneRenderer.Renderers.Add(new VolumetricLightRenderer(GraphicsService));
// Update terrain clipmaps. (Only necessary if TerrainNodes are used.)
_terrainClipmapRenderer = new TerrainClipmapRenderer(GraphicsService);
// Renderer for cloud maps. (Only necessary if LayeredCloudMaps are used.)
_cloudMapRenderer = new CloudMapRenderer(GraphicsService);
// Renderer for SceneCaptureNodes. See also SceneCapture2DSample.
// In the constructor we specify a method which is called in SceneCaptureRenderer.Render()
// when the scene must be rendered for the SceneCaptureNodes.
SceneCaptureRenderer = new SceneCaptureRenderer(context =>
{
// Get scene nodes which are visible by the current camera.
CustomSceneQuery sceneQuery = Scene.Query <CustomSceneQuery>(context.CameraNode, context);
// Render scene (with post-processing, with lens flares, no debug rendering, no reticle).
RenderScene(sceneQuery, context, true, true, false, false);
});
// Renderer for PlanarReflectionNodes. See also PlanarReflectionSample.
// In the constructor we specify a method which is called in PlanarReflectionRenderer.Render()
// to create the reflection images.
_planarReflectionRenderer = new PlanarReflectionRenderer(context =>
{
// Get scene nodes which are visible by the current camera.
CustomSceneQuery sceneQuery = Scene.Query <CustomSceneQuery>(context.CameraNode, context);
var planarReflectionNode = (PlanarReflectionNode)context.ReferenceNode;
// Planar reflections are often for WaterNodes. These nodes should not be rendered
// into their own reflection map because when the water surface is displaced by waves,
// some waves could be visible in the reflection.
// --> Remove the water node from the renderable nodes. (In our samples, the water
// node is the parent of the reflection node.)
if (planarReflectionNode.Parent is WaterNode)
{
var index = sceneQuery.RenderableNodes.IndexOf(planarReflectionNode.Parent);
if (index >= 0)
{
sceneQuery.RenderableNodes[index] = null;
}
}
// Render scene (no post-processing, no lens flares, no debug rendering, no reticle).
RenderScene(sceneQuery, context, false, false, false, false);
});
_waterWavesRenderer = new WaterWavesRenderer(GraphicsService);
// The shadow map renderer renders a depth image from the viewpoint of the light and
// stores it in LightNode.Shadow.ShadowMap.
ShadowMapRenderer = new ShadowMapRenderer(context =>
{
var query = context.Scene.Query <ShadowCasterQuery>(context.CameraNode, context);
if (query.ShadowCasters.Count == 0)
{
return(false);
}
_opaqueMeshSceneRenderer.Render(query.ShadowCasters, context);
return(true);
});
// The shadow mask renderer evaluates the shadow maps, does shadow filtering
// and stores the resulting shadow factor in a screen space image
//(see LightNode.Shadow.ShadowMask/ShadowMaskChannel).
ShadowMaskRenderer = new ShadowMaskRenderer(GraphicsService, 2);
// Optionally, we can blur the shadow mask to make the shadows smoother.
var blur = new Blur(GraphicsService)
{
IsAnisotropic = false,
IsBilateral = true,
EdgeSoftness = 0.05f,
Scale = 1f,
Enabled = false, // Disable blur by default.
};
blur.InitializeGaussianBlur(11, 3, true);
ShadowMaskRenderer.Filter = blur;
// Renderers which create the intermediate render targets:
// Those 2 renderers are implemented in this sample. Those functions could
// be implemented directly in this class but we have created separate classes
// to make the code more readable.
_gBufferRenderer = new GBufferRenderer(GraphicsService, _opaqueMeshSceneRenderer, _decalRenderer);
LightBufferRenderer = new LightBufferRenderer(GraphicsService);
// Other specialized renderers:
_lensFlareRenderer = new LensFlareRenderer(GraphicsService);
_skyRenderer = new SkyRenderer(GraphicsService);
_fogRenderer = new FogRenderer(GraphicsService);
_internalDebugRenderer = new DebugRenderer(GraphicsService, null);
_rebuildZBufferRenderer = new RebuildZBufferRenderer(GraphicsService);
Scene = new Scene();
// This screen needs a HDR filter to map high dynamic range values back to
// low dynamic range (LDR).
PostProcessors = new PostProcessorChain(GraphicsService);
PostProcessors.Add(new HdrFilter(GraphicsService)
{
EnableBlueShift = true,
BlueShiftCenter = 0.0004f,
BlueShiftRange = 0.5f,
//BlueShiftColor = new Vector3(1.05f / 4f, 0.97f / 4f, 1.27f / 4f), // Default physically-based blue-shift
BlueShiftColor = new Vector3(0.25f, 0.25f, 0.7f), // More dramatic blue-shift
MinExposure = 0,
MaxExposure = 10,
BloomIntensity = 1,
BloomThreshold = 0.6f,
});
_underwaterPostProcessor = new UnderwaterPostProcessor(GraphicsService, contentManager);
PostProcessors.Add(_underwaterPostProcessor);
// Use 2D texture for reticle.
_reticle = contentManager.Load <Texture2D>("Reticle");
// Use the sprite font of the GUI.
var uiContentManager = services.GetInstance <ContentManager>("UIContent");
var spriteFont = uiContentManager.Load <SpriteFont>("UI Themes/BlendBlue/Default");
DebugRenderer = new DebugRenderer(GraphicsService, spriteFont)
{
DefaultColor = new Color(0, 0, 0),
DefaultTextPosition = new Vector2F(10),
};
EnableLod = true;
}
