public bool Setup(RenderTargetHandle destination, ref RenderingData renderingData, int maxVisibleAdditinalLights)
{
Clear();
this.destination = destination;
if (m_AdditionalLightShadowMatrices.Length != maxVisibleAdditinalLights)
{
m_AdditionalLightShadowMatrices = new Matrix4x4[maxVisibleAdditinalLights];
m_AdditionalLightSlices = new ShadowSliceData[maxVisibleAdditinalLights];
m_AdditionalLightsShadowStrength = new float[maxVisibleAdditinalLights];
}
m_AdditionalShadowCastingLightIndices.Clear();
Bounds bounds;
var visibleLights = renderingData.lightData.visibleLights;
int additionalLightsCount = renderingData.lightData.additionalLightsCount;
for (int i = 0; i < visibleLights.Length && m_AdditionalShadowCastingLightIndices.Count < additionalLightsCount; ++i)
{
if (i == renderingData.lightData.mainLightIndex)
{
continue;
}
VisibleLight shadowLight = visibleLights[i];
Light light = shadowLight.light;
if (shadowLight.lightType == LightType.Spot && light != null && light.shadows != LightShadows.None)
{
if (renderingData.cullResults.GetShadowCasterBounds(i, out bounds))
{
m_AdditionalShadowCastingLightIndices.Add(i);
}
}
}
int shadowCastingLightsCount = m_AdditionalShadowCastingLightIndices.Count;
if (shadowCastingLightsCount == 0)
{
return(false);
}
// TODO: Add support to point light shadows. We make a simplification here that only works
// for spot lights and with max spot shadows per pass.
int atlasWidth = renderingData.shadowData.additionalLightsShadowmapWidth;
int atlasHeight = renderingData.shadowData.additionalLightsShadowmapHeight;
int sliceResolution = ShadowUtils.GetMaxTileResolutionInAtlas(atlasWidth, atlasHeight, shadowCastingLightsCount);
bool anyShadows = false;
int shadowSlicesPerRow = (atlasWidth / sliceResolution);
for (int i = 0; i < shadowCastingLightsCount; ++i)
{
int shadowLightIndex = m_AdditionalShadowCastingLightIndices[i];
VisibleLight shadowLight = visibleLights[shadowLightIndex];
// Currently Only Spot Lights are supported in additional lights
Debug.Assert(shadowLight.lightType == LightType.Spot);
Matrix4x4 shadowTransform;
bool success = ShadowUtils.ExtractSpotLightMatrix(ref renderingData.cullResults, ref renderingData.shadowData,
shadowLightIndex, out shadowTransform, out m_AdditionalLightSlices[i].viewMatrix, out m_AdditionalLightSlices[i].projectionMatrix);
if (success)
{
// TODO: We need to pass bias and scale list to shader to be able to support multiple
// shadow casting additional lights.
m_AdditionalLightSlices[i].offsetX = (i % shadowSlicesPerRow) * sliceResolution;
m_AdditionalLightSlices[i].offsetY = (i / shadowSlicesPerRow) * sliceResolution;
m_AdditionalLightSlices[i].resolution = sliceResolution;
m_AdditionalLightSlices[i].shadowTransform = shadowTransform;
m_AdditionalLightsShadowStrength[i] = shadowLight.light.shadowStrength;
anyShadows = true;
}
else
{
m_AdditionalShadowCastingLightIndices.RemoveAt(i--);
}
}
return(anyShadows);
}
void RenderAdditionalShadowmapAtlas(ref ScriptableRenderContext context, ref CullResults cullResults, ref LightData lightData, ref ShadowData shadowData)
{
List <int> additionalLightIndices = lightData.additionalLightIndices;
List <VisibleLight> visibleLights = lightData.visibleLights;
int shadowCastingLightsCount = 0;
int additionalLightsCount = additionalLightIndices.Count;
for (int i = 0; i < additionalLightsCount; ++i)
{
VisibleLight shadowLight = visibleLights[additionalLightIndices[i]];
if (shadowLight.lightType == LightType.Spot && shadowLight.light.shadows != LightShadows.None)
{
shadowCastingLightsCount++;
}
}
if (shadowCastingLightsCount == 0)
{
return;
}
Matrix4x4 view, proj;
Bounds bounds;
CommandBuffer cmd = CommandBufferPool.Get(k_RenderAdditionalLightShadows);
using (new ProfilingSample(cmd, k_RenderAdditionalLightShadows))
{
// TODO: Add support to point light shadows. We make a simplification here that only works
// for spot lights and with max spot shadows per pass.
int atlasWidth = shadowData.additionalLightsShadowmapWidth;
int atlasHeight = shadowData.additionalLightsShadowmapHeight;
int sliceResolution = ShadowUtils.GetMaxTileResolutionInAtlas(atlasWidth, atlasHeight, shadowCastingLightsCount);
m_AdditionalLightsShadowmapTexture = RenderTexture.GetTemporary(shadowData.additionalLightsShadowmapWidth,
shadowData.additionalLightsShadowmapHeight, k_ShadowmapBufferBits, m_AdditionalShadowmapFormat);
m_AdditionalLightsShadowmapTexture.filterMode = FilterMode.Bilinear;
m_AdditionalLightsShadowmapTexture.wrapMode = TextureWrapMode.Clamp;
SetRenderTarget(cmd, m_AdditionalLightsShadowmapTexture, RenderBufferLoadAction.DontCare, RenderBufferStoreAction.Store,
ClearFlag.Depth, Color.black, TextureDimension.Tex2D);
for (int i = 0; i < additionalLightsCount; ++i)
{
int shadowLightIndex = additionalLightIndices[i];
VisibleLight shadowLight = visibleLights[shadowLightIndex];
Light light = shadowLight.light;
// TODO: Add support to point light shadows
if (shadowLight.lightType != LightType.Spot || shadowLight.light.shadows == LightShadows.None)
{
continue;
}
if (!cullResults.GetShadowCasterBounds(shadowLightIndex, out bounds))
{
continue;
}
Matrix4x4 shadowTransform;
bool success = ShadowUtils.ExtractSpotLightMatrix(ref cullResults, ref shadowData,
shadowLightIndex, out shadowTransform, out view, out proj);
if (success)
{
// This way of computing the shadow slice only work for spots and with most 4 shadow casting lights per pass
// Change this when point lights are supported.
Debug.Assert(shadowCastingLightsCount <= 4 && shadowLight.lightType == LightType.Spot);
// TODO: We need to pass bias and scale list to shader to be able to support multiple
// shadow casting additional lights.
m_AdditionalLightSlices[i].offsetX = (i % 2) * sliceResolution;
m_AdditionalLightSlices[i].offsetY = (i / 2) * sliceResolution;
m_AdditionalLightSlices[i].resolution = sliceResolution;
m_AdditionalLightSlices[i].shadowTransform = shadowTransform;
m_AdditionalLightsShadowStrength[i] = light.shadowStrength;
if (shadowCastingLightsCount > 1)
{
ShadowUtils.ApplySliceTransform(ref m_AdditionalLightSlices[i], atlasWidth, atlasHeight);
}
var settings = new DrawShadowsSettings(cullResults, shadowLightIndex);
Vector4 shadowBias = ShadowUtils.GetShadowBias(ref shadowLight, shadowLightIndex,
ref shadowData, proj, sliceResolution);
ShadowUtils.SetupShadowCasterConstantBuffer(cmd, ref shadowLight, shadowBias);
ShadowUtils.RenderShadowSlice(cmd, ref context, ref m_AdditionalLightSlices[i], ref settings, proj, view);
}
}
SetupAdditionalLightsShadowReceiverConstants(cmd, ref shadowData);
}
context.ExecuteCommandBuffer(cmd);
CommandBufferPool.Release(cmd);
}