public TEventType GetOrCreate(IInputDevice device)
{
TEventType item = pool.Add();
item.Device = device;
return(item);
}
/// <summary>
/// Creates a default view with the shadow caster stage added to it
/// </summary>
public virtual ShadowMapRenderView CreateRenderView()
{
var shadowRenderView = shadowRenderViews.Add();
shadowRenderView.RenderStages.Add(ShadowCasterRenderStage);
return(shadowRenderView);
}
public virtual LightShadowMapTexture CreateShadowMapTexture(RenderView renderView, RenderLight renderLight, IDirectLight light, int shadowMapSize)
{
var shadowMap = shadowMaps.Add();
shadowMap.Initialize(renderView, renderLight, light, light.Shadow, shadowMapSize, this);
return(shadowMap);
}
// TODO: This function is not being called anywhere. Find a way to integrate it and do the light attribute extraction here instead of within "ApplyDrawParameters()".
public void Collect(RenderContext context, RenderView sourceView, LightShadowMapTexture lightShadowMap) // TODO: Remove the shadow map parameter.
{
// Computes the cascade splits
var lightComponent = lightShadowMap.RenderLight;
var spotLight = (LightSpot)lightComponent.Type;
// Get new shader data from pool
var shaderData = shaderDataPool.Add();
lightShadowMap.ShaderData = shaderData;
shaderData.ProjectiveTextureMipMapLevel = (float)(lightParameters.ProjectionTexture.MipLevels - 1) * spotLight.MipMapScale; // "- 1" because the lowest mip level is 0, not 1.
shaderData.WorldToTextureUV = ComputeWorldToTextureUVMatrix(lightComponent); // View-projection matrix without offset to cascade.
}
internal void AllocateCollectionsPerGroupOfCullingMask()
{
// Clear the pool (but keep instances already created)
lightCollectionPool.Clear();
// At worst, we have 32 collections (one per bit active in the culling mask)
for (int i = 0; i < groupMasks.Length; i++)
{
var mask = groupMasks[i++];
if (mask == 0)
{
continue;
}
// Check if there is a previous collection for the current mask
int collectionIndex = -1;
for (int j = 0; j < lightCollectionPool.Count; j++)
{
if ((uint)lightCollectionPool[j].CullingMask == mask)
{
collectionIndex = j;
break;
}
}
// If no collection found for this mask, create a new one
if (collectionIndex < 0)
{
collectionIndex = lightCollectionPool.Count;
// Use a pool to avoid recreating collections
var collection = lightCollectionPool.Add();
// The selected collection is associated with the specified mask
collection.CullingMask = (EntityGroupMask)mask;
}
// Store the index of the collection for the current bit
groupMasks[i] = (uint)collectionIndex;
}
}
public override void Collect(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 shadowRenderView = shadowMapRenderer.CurrentView;
var viewToWorld = shadowRenderView.View;
viewToWorld.Invert();
// Update the frustum infos
UpdateFrustum(shadowRenderView);
// 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;
float splitMaxRatio = (minMaxDistance.X - shadowRenderView.NearClipPlane) / (shadowRenderView.FarClipPlane - shadowRenderView.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
var viewMatrix = Matrix.LookAtLH(target + direction * cascadeMinBoundLS.Z, target, upDirection); // View;;
var projectionMatrix = Matrix.OrthoOffCenterLH(cascadeMinBoundLS.X, cascadeMaxBoundLS.X, cascadeMinBoundLS.Y, cascadeMaxBoundLS.Y, 0.0f, cascadeMaxBoundLS.Z - cascadeMinBoundLS.Z); // Projection
Matrix viewProjectionMatrix;
Matrix.Multiply(ref viewMatrix, ref projectionMatrix, out viewProjectionMatrix);
// Stabilize the Shadow matrix on the projection
if (shadow.StabilizationMode == LightShadowMapStabilizationMode.ProjectionSnapping)
{
var shadowPixelPosition = 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;
projectionMatrix.Row4 += shadowPixelOffset;
Matrix.Multiply(ref viewMatrix, ref projectionMatrix, out viewProjectionMatrix);
}
shaderData.ViewMatrix[cascadeLevel] = viewMatrix;
shaderData.ProjectionMatrix[cascadeLevel] = projectionMatrix;
// Cascade splits in light space using depth: Store depth on first CascaderCasterMatrix in last column of each row
shaderData.CascadeSplits[cascadeLevel] = MathUtil.Lerp(shadowRenderView.NearClipPlane, shadowRenderView.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 viewProjectionMatrix, ref adjustmentMatrix, out shaderData.WorldToShadowCascadeUV[cascadeLevel]);
}
}
public override LightShaderGroupData CreateGroupData()
{
var data = dataPool.Add();
return(data);
}
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;
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;
// Update the shadow camera
shadowCamera.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.
shadowCamera.ProjectionMatrix = Matrix.PerspectiveFovLH(spotLight.AngleOuterInRadians, 1.0f, 0.01f, spotLight.Range * 2.0f); // Perspective Projection for spotlights
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);
shaderData.ViewMatrix = shadowCamera.ViewMatrix;
shaderData.ProjectionMatrix = shadowCamera.ProjectionMatrix;
}
public override void Collect(RenderContext context, RenderView sourceView, LightShadowMapTexture lightShadowMap)
{
// TODO: Min and Max distance can be auto-computed from readback from Z buffer // Yeah sure... good luck with that.
var shadow = (LightStandardShadowMap)lightShadowMap.Shadow;
// Computes the cascade splits
var renderLight = lightShadowMap.RenderLight;
var spotLight = (LightSpot)renderLight.Type;
// 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;
// TODO: Calculation of near and far is hardcoded/approximated. We should find a better way to calculate it.
var nearClip = 0.01f; // TODO: This should be configurable.
var farClip = spotLight.Range * 2.0f; // TODO: For some reason this multiplication by two is required. This should be investigated and fixed properly.
shaderData.DepthRange = new Vector2(nearClip, farClip); //////////////////////////////////////////
// Update the shadow camera
Matrix.Invert(ref renderLight.WorldMatrix, out var viewMatrix);
Matrix.PerspectiveFovRH(spotLight.AngleOuterInRadians, spotLight.AspectRatio, nearClip, farClip, out var projectionMatrix); // Perspective Projection for spotlights
Matrix.Multiply(ref viewMatrix, ref projectionMatrix, out var 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.Scaling(leftX, -leftY, 1.0f, out var scaleMatrix);
Matrix.Translation(centerX, centerY, 0.0f, out var translationMatrix);
Matrix.Multiply(ref scaleMatrix, ref translationMatrix, out var adjustmentMatrix);
// Calculate View Proj matrix from World space to Cascade space
Matrix.Multiply(ref viewProjectionMatrix, ref adjustmentMatrix, out shaderData.WorldToShadowCascadeUV);
//Matrix rotationMatrix = Matrix.RotationZ(rotationZ);
//Matrix.Multiply(ref viewProjectionMatrix, ref rotationMatrix, out shaderData.worldToShadowProjectiveTextureUV);
shaderData.ViewMatrix = viewMatrix;
shaderData.ProjectionMatrix = projectionMatrix;
// Allocate shadow render view
var shadowRenderView = CreateRenderView();
shadowRenderView.RenderView = sourceView;
shadowRenderView.ShadowMapTexture = lightShadowMap;
shadowRenderView.Rectangle = shadowMapRectangle;
// Compute view parameters
shadowRenderView.View = shaderData.ViewMatrix;
shadowRenderView.Projection = shaderData.ProjectionMatrix;
Matrix.Multiply(ref shadowRenderView.View, ref shadowRenderView.Projection, out shadowRenderView.ViewProjection);
shadowRenderView.ViewSize = new Vector2(shadowMapRectangle.Width, shadowMapRectangle.Height);
shadowRenderView.NearClipPlane = nearClip;
shadowRenderView.FarClipPlane = farClip;
// Add the render view for the current frame
context.RenderSystem.Views.Add(shadowRenderView);
// Collect objects in shadow views
context.VisibilityGroup.TryCollect(shadowRenderView);
}