public override int Compare(LightShaderGroupEntry<LightGroupKey> x, LightShaderGroupEntry<LightGroupKey> y)
{
var compareRenderer = (x.Key.ShadowRenderer != null).CompareTo(y.Key.ShadowRenderer != null);
if (compareRenderer != 0)
return compareRenderer;
return ((int)x.Key.ShadowType).CompareTo((int)y.Key.ShadowType);
}
public override int Compare(LightShaderGroupEntry <LightGroupKey> x, LightShaderGroupEntry <LightGroupKey> y)
{
int compareShadowRenderer = (x.Key.ShadowRenderer != null).CompareTo(y.Key.ShadowRenderer != null);
if (compareShadowRenderer != 0)
{
return(compareShadowRenderer);
}
int compareTextureProjectionRenderer = (x.Key.TextureProjectionRenderer != null).CompareTo(y.Key.TextureProjectionRenderer != null);
if (compareTextureProjectionRenderer != 0)
{
return(compareTextureProjectionRenderer);
}
return(((int)x.Key.ShadowType).CompareTo((int)y.Key.ShadowType));
}
public bool Equals(LightShaderGroupEntry <T> other)
{
return(Key.Equals(other.Key) && Value.Equals(other.Value));
}
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();
}