public override bool Update(RenderLight light)
{
var range = Math.Max(0.001f, Radius);
InvSquareRadius = 1.0f / (range * range);
return(true);
}
internal void AddLight(RenderLight renderLight)
{
var cullingMask = RenderGroupMask.All; //lightComponent.CullingMask;
// Iterate only on allocated collections
foreach (var lightCollectionGroup in lightCollectionPool)
{
// Check if a light culling mask belong to the current group
if ((lightCollectionGroup.CullingMask & cullingMask) == 0)
{
continue;
}
lightCollectionGroup.Add(renderLight);
}
// Keep a list of all lights for this group
allLights.Add(renderLight);
// If the light has shadows, populate a separate list
var directLight = renderLight.Type as IDirectLight;
if (directLight != null && directLight.Shadow.Enabled)
{
allLightsWithShadows.Add(renderLight);
}
}
internal void PrepareLight(RenderLight renderLight)
{
var cullingMask = RenderGroupMask.All; //lightComponent.CullingMask;
// Don't procses a mask have we have already processed. We don't expect a huge combination of culling mask here
if (!allMasks.Add(cullingMask))
{
return;
}
// Fit individual bits and prepare collection group based on mask
// We iterate on each possible bits and we `And` all active masks for this particular bit
var groupMask = (uint)cullingMask;
for (int groupIndex = 0; groupMask != 0; groupMask = groupMask >> 1, groupIndex++)
{
if ((groupMask & 1) == 0)
{
continue;
}
var previousMask = groupMasks[groupIndex * 2];
previousMask = previousMask == 0 ? (uint)cullingMask : previousMask & (uint)cullingMask;
groupMasks[groupIndex * 2] = previousMask;
}
}
// Computes the view-projection matrix without any offset or scaling cascade.
private static Matrix ComputeProjectorPlaneMatrix(RenderLight light)
{
var spotLight = (LightSpot)light.Type;
// Calculate the width and height of the near plane in world space:
var nearClipDistance = Math.Min(spotLight.ProjectionPlaneDistance, spotLight.Range);
float angleOuterInRadians = MathUtil.DegreesToRadians(Math.Max(spotLight.AngleInner, spotLight.AngleOuter));
float height = (float)Math.Tan(angleOuterInRadians / 2.0f) * nearClipDistance; // TODO: Is this correct?
float width = height * spotLight.AspectRatio; // TODO: Is this correct?
Matrix viewMatrix = light.WorldMatrix;
// Translate the matrix to position it at the near plane.
Vector3 translation = viewMatrix.Forward * nearClipDistance;
viewMatrix.M41 += translation.X;
viewMatrix.M42 += translation.Y;
viewMatrix.M43 += translation.Z;
// Scale the X axis by the plane width:
viewMatrix.M11 *= -width;
viewMatrix.M12 *= -width; // Invert the matrix so we don't have to do it in the shader.
viewMatrix.M13 *= -width;
// Scale the Y axis by the plane width:
viewMatrix.M21 *= -height;
viewMatrix.M22 *= -height; // Invert the matrix so we don't have to do it in the shader.
viewMatrix.M23 *= -height;
return(viewMatrix); // Model matrix of the projector plane.
}
public override bool Update(RenderLight light)
{
var range = Math.Max(0.001f, Range);
InvSquareRange = 1.0f / (range * range);
var innerAngle = Math.Min(AngleInner, AngleOuter);
var outerAngle = Math.Max(AngleInner, AngleOuter);
AngleOuterInRadians = MathUtil.DegreesToRadians(outerAngle);
var cosInner = (float)Math.Cos(MathUtil.DegreesToRadians(innerAngle / 2));
var cosOuter = (float)Math.Cos(AngleOuterInRadians * 0.5f);
LightAngleScale = 1.0f / Math.Max(0.001f, cosInner - cosOuter);
LightAngleOffset = -cosOuter * LightAngleScale;
LightRadiusAtTarget = (float)Math.Abs(Range * Math.Sin(AngleOuterInRadians * 0.5f));
return(true);
}
// Computes the view-projection matrix without any offset or scaling cascade.
private static Matrix ComputeWorldToTextureUVMatrix(RenderLight light)
{
var spotLight = (LightSpot)light.Type;
Matrix.Invert(ref light.WorldMatrix, out var viewMatrix);
// TODO: PERFORMANCE: This does redundant work. The view projection matrix is already calculated within "LightSpotShadowMapRenderer".
// 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; // Removed the multiplication by two because I didn't see the point in it.
var projectionMatrix = Matrix.PerspectiveFovRH(spotLight.AngleOuterInRadians, spotLight.AspectRatio, nearClip, farClip); // Perspective Projection for spotlights
Matrix viewProjectionMatrix;
Matrix.Multiply(ref viewMatrix, ref projectionMatrix, out viewProjectionMatrix);
// TODO: Add an offset so we don't have to do it in the shader?
return(viewProjectionMatrix); // View-projection matrix without offset to cascade.
}
private bool CanRenderLight(RenderLight renderLight, ref ProcessLightsParameters parameters, bool hasNextRenderer)
{
Texture projectionTexture = null;
if (renderLight.Type is LightSpot spotLight) // TODO: PERFORMANCE: I would say that casting this for every light is slow, no?
{
projectionTexture = spotLight.ProjectiveTexture;
}
// Check if there might be a renderer that supports shadows instead (in that case skip the light)
LightShadowMapTexture shadowMapTexture;
if ((hasNextRenderer && parameters.ShadowMapTexturesPerLight.TryGetValue(renderLight, out shadowMapTexture)) // If the light has shadows:
// TODO: Check for "hasNextRenderer && projectionTexture != null" instead?
|| projectionTexture != null) // If the light projects a texture (we check for this because otherwise this renderer would "steal" the light from the spot light renderer which handles texture projection):
{
// Ignore lights with textures or shadows.
return(false);
}
return(true);
}
private LightShadowType GetShadowType(RenderLight light)
{
ShadowMapTexturesPerLight.TryGetValue(light, out LightShadowMapTexture shadow);
return(shadow?.ShadowType ?? 0);
}
public override void ProcessLights(ProcessLightsParameters parameters)
{
if (parameters.LightCollection.Count == 0)
{
return;
}
// Check if we have a fallback renderer next in the chain, in case we don't need shadows
bool hasNextRenderer = parameters.RendererIndex < (parameters.Renderers.Length - 1);
ILightShadowMapRenderer currentShadowRenderer = null;
LightShadowType currentShadowType = 0;
// Start by filtering/sorting what can be processed
shadowComparer.ShadowMapTexturesPerLight = parameters.ShadowMapTexturesPerLight;
shadowComparer.Lights = parameters.LightCollection;
parameters.LightIndices.Sort(0, parameters.LightIndices.Count, shadowComparer);
// Loop over the number of lights + 1 where the last iteration will always flush the last batch of lights
for (int j = 0; j < parameters.LightIndices.Count + 1;)
{
// TODO: Eventually move this loop to a separate function that returns a structure.
// These variables will contain the relevant parameters of the next usable light:
LightShadowType nextShadowType = 0;
ILightShadowMapRenderer nextShadowRenderer = null;
LightShadowMapTexture nextShadowTexture = null;
RenderLight nextLight = null;
// Find the next light whose attributes aren't null:
if (j < parameters.LightIndices.Count)
{
nextLight = parameters.LightCollection[parameters.LightIndices[j]];
if (parameters.ShadowMapRenderer != null &&
parameters.ShadowMapTexturesPerLight.TryGetValue(nextLight, out nextShadowTexture) &&
nextShadowTexture.Atlas != null) // atlas could not be allocated? treat it as a non-shadowed texture
{
nextShadowType = nextShadowTexture.ShadowType;
nextShadowRenderer = nextShadowTexture.Renderer;
}
}
// Flush current group
// If we detect that the previous light's attributes don't match the next one's, create a new group (or add to an existing one that has the same attributes):
if (j == parameters.LightIndices.Count ||
currentShadowType != nextShadowType ||
currentShadowRenderer != nextShadowRenderer) // TODO: Refactor this into a little structure instead.
{
if (processedLights.Count > 0)
{
var lightGroupKey = new LightGroupKey(currentShadowRenderer, currentShadowType);
LightShaderGroupDynamic lightShaderGroup = FindOrCreateLightShaderGroup(lightGroupKey, parameters);
// Add view and lights to the current group:
var allowedLightCount = lightShaderGroup.AddView(parameters.ViewIndex, parameters.View, processedLights.Count);
for (int i = 0; i < allowedLightCount; ++i)
{
LightDynamicEntry light = processedLights[i];
lightShaderGroup.AddLight(light.Light, light.ShadowMapTexture);
}
// TODO: assign extra lights to non-shadow rendering if possible
//for (int i = lightCount; i < processedLights.Count; ++i)
// XXX.AddLight(processedLights[i], null);
// Add the current light shader group to the collection if it hasn't already been added:
var lightShaderGroupEntry = new LightShaderGroupEntry <LightGroupKey>(lightGroupKey, lightShaderGroup);
if (!lightShaderGroups.Contains(lightShaderGroupEntry))
{
lightShaderGroups.Add(lightShaderGroupEntry);
}
processedLights.Clear();
}
// Start next group
currentShadowType = nextShadowType;
currentShadowRenderer = nextShadowRenderer;
}
if (j < parameters.LightIndices.Count)
{
// Do we need to process non shadowing lights or defer it to something else?
if (nextShadowTexture == null && hasNextRenderer)
{
// Break out so the remaining lights can be handled by the next renderer
break;
}
parameters.LightIndices.RemoveAt(j);
processedLights.Add(new LightDynamicEntry(nextLight, nextShadowTexture));
}
else
{
j++;
}
}
processedLights.Clear();
}
public override bool Update(RenderLight light)
{
return(true);
}
public bool Update(RenderLight light)
{
Rotation = Quaternion.RotationMatrix(light.WorldMatrix);
return(Skybox != null);
}
public LightDynamicEntry(RenderLight light, LightShadowMapTexture shadowMapTexture)
{
Light = light;
ShadowMapTexture = shadowMapTexture;
}
/// <summary>
/// Try to add light to this group (returns false if not possible).
/// </summary>
/// <param name="light"></param>
/// <param name="shadowMapTexture"></param>
/// <returns></returns>
public bool AddLight(RenderLight light, LightShadowMapTexture shadowMapTexture)
{
lights.Add(new LightDynamicEntry(light, shadowMapTexture));
return(true);
}
private RenderLightCollectionGroup GetLightGroup(RenderViewLightData renderViewData, RenderLight light)
{
RenderLightCollectionGroup lightGroup;
var directLight = light.Type as IDirectLight;
var lightGroups = renderViewData.ActiveLightGroups;
var type = light.Type.GetType();
if (!lightGroups.TryGetValue(type, out lightGroup))
{
lightGroup = new RenderLightCollectionGroup(type);
lightGroups.Add(type, lightGroup);
}
return(lightGroup);
}
public abstract bool Update(RenderLight light);
