public bool Setup(ref RenderingData renderingData)
{
if (!renderingData.shadowData.supportsMainLightShadows)
{
return(false);
}
Clear();
int shadowLightIndex = renderingData.lightData.mainLightIndex;
if (shadowLightIndex == -1)
{
return(false);
}
VisibleLight shadowLight = renderingData.lightData.visibleLights[shadowLightIndex];
Light light = shadowLight.light;
if (light.shadows == LightShadows.None)
{
return(false);
}
if (shadowLight.lightType != LightType.Directional)
{
Debug.LogWarning("Only directional lights are supported as main light.");
}
Bounds bounds;
if (!renderingData.cullResults.GetShadowCasterBounds(shadowLightIndex, out bounds))
{
return(false);
}
m_ShadowCasterCascadesCount = renderingData.shadowData.mainLightShadowCascadesCount;
int shadowResolution = ShadowUtils.GetMaxTileResolutionInAtlas(renderingData.shadowData.mainLightShadowmapWidth,
renderingData.shadowData.mainLightShadowmapHeight, m_ShadowCasterCascadesCount);
m_ShadowmapWidth = renderingData.shadowData.mainLightShadowmapWidth;
m_ShadowmapHeight = (m_ShadowCasterCascadesCount == 2) ?
renderingData.shadowData.mainLightShadowmapHeight >> 1 :
renderingData.shadowData.mainLightShadowmapHeight;
for (int cascadeIndex = 0; cascadeIndex < m_ShadowCasterCascadesCount; ++cascadeIndex)
{
bool success = ShadowUtils.ExtractDirectionalLightMatrix(ref renderingData.cullResults, ref renderingData.shadowData,
shadowLightIndex, cascadeIndex, m_ShadowmapWidth, m_ShadowmapHeight, shadowResolution, light.shadowNearPlane,
out m_CascadeSplitDistances[cascadeIndex], out m_CascadeSlices[cascadeIndex], out m_CascadeSlices[cascadeIndex].viewMatrix, out m_CascadeSlices[cascadeIndex].projectionMatrix);
if (!success)
{
return(false);
}
}
return(true);
}
public bool Setup(ref RenderingData renderingData)
{
if (!renderingData.shadowData.supportsAdditionalLightShadows)
{
return(false);
}
Clear();
m_ShadowmapWidth = renderingData.shadowData.additionalLightsShadowmapWidth;
m_ShadowmapHeight = renderingData.shadowData.additionalLightsShadowmapHeight;
var visibleLights = renderingData.lightData.visibleLights;
int additionalLightsCount = renderingData.lightData.additionalLightsCount;
if (m_AdditionalLightSlices == null || m_AdditionalLightSlices.Length < additionalLightsCount)
{
m_AdditionalLightSlices = new ShadowSliceData[additionalLightsCount];
}
if (m_AdditionalLightsShadowData == null || m_AdditionalLightsShadowData.Length < additionalLightsCount)
{
m_AdditionalLightsShadowData = new ShaderInput.ShadowData[additionalLightsCount];
}
int validShadowCastingLights = 0;
bool supportsSoftShadows = renderingData.shadowData.supportsSoftShadows;
for (int i = 0; i < visibleLights.Length && m_AdditionalShadowCastingLightIndices.Count < additionalLightsCount; ++i)
{
VisibleLight shadowLight = visibleLights[i];
// Skip all directional lights as they are not baked into the additional
// shadowmap atlas.
if (shadowLight.lightType == LightType.Directional)
{
continue;
}
int shadowCastingLightIndex = m_AdditionalShadowCastingLightIndices.Count;
bool isValidShadowSlice = false;
if (IsValidShadowCastingLight(ref renderingData.lightData, i))
{
if (renderingData.cullResults.GetShadowCasterBounds(i, out var bounds))
{
bool success = ShadowUtils.ExtractSpotLightMatrix(ref renderingData.cullResults,
ref renderingData.shadowData,
i,
out var shadowTransform,
out m_AdditionalLightSlices[shadowCastingLightIndex].viewMatrix,
out m_AdditionalLightSlices[shadowCastingLightIndex].projectionMatrix);
if (success)
{
m_AdditionalShadowCastingLightIndices.Add(i);
var light = shadowLight.light;
float shadowStrength = light.shadowStrength;
float softShadows = (supportsSoftShadows && light.shadows == LightShadows.Soft) ? 1.0f : 0.0f;
Vector4 shadowParams = new Vector4(shadowStrength, softShadows, 0.0f, 0.0f);
if (m_UseStructuredBuffer)
{
m_AdditionalLightsShadowData[shadowCastingLightIndex].worldToShadowMatrix = shadowTransform;
m_AdditionalLightsShadowData[shadowCastingLightIndex].shadowParams = shadowParams;
}
else
{
m_AdditionalLightsWorldToShadow[shadowCastingLightIndex] = shadowTransform;
m_AdditionalLightsShadowParams[shadowCastingLightIndex] = shadowParams;
}
isValidShadowSlice = true;
validShadowCastingLights++;
}
}
}
if (m_UseStructuredBuffer)
{
// When using StructuredBuffers all the valid shadow casting slices data
// are stored in a the ShadowData buffer and then we setup a index map to
// map from light indices to shadow buffer index. A index map of -1 means
// the light is not a valid shadow casting light and there's no data for it
// in the shadow buffer.
int indexMap = (isValidShadowSlice) ? shadowCastingLightIndex : -1;
m_AdditionalShadowCastingLightIndicesMap.Add(indexMap);
}
else if (!isValidShadowSlice)
{
// When NOT using structured buffers we have no performant way to sample the
// index map as int[]. Unity shader compiler converts int[] to float4[] to force memory alignment.
// This makes indexing int[] arrays very slow. So, in order to avoid indexing shadow lights we
// setup slice data and reserve shadow map space even for invalid shadow slices.
// The data is setup with zero shadow strength. This has the same visual effect of no shadow
// attenuation contribution from this light.
// This makes sampling shadow faster but introduces waste in shadow map atlas.
// The waste increases with the amount of additional lights to shade.
// Therefore Universal RP try to keep the limit at sane levels when using uniform buffers.
Matrix4x4 identity = Matrix4x4.identity;
m_AdditionalShadowCastingLightIndices.Add(i);
m_AdditionalLightsWorldToShadow[shadowCastingLightIndex] = identity;
m_AdditionalLightsShadowParams[shadowCastingLightIndex] = Vector4.zero;
m_AdditionalLightSlices[shadowCastingLightIndex].viewMatrix = identity;
m_AdditionalLightSlices[shadowCastingLightIndex].projectionMatrix = identity;
}
}
// Lights that need to be rendered in the shadow map atlas
if (validShadowCastingLights == 0)
{
return(false);
}
int atlasWidth = renderingData.shadowData.additionalLightsShadowmapWidth;
int atlasHeight = renderingData.shadowData.additionalLightsShadowmapHeight;
int sliceResolution = ShadowUtils.GetMaxTileResolutionInAtlas(atlasWidth, atlasHeight, validShadowCastingLights);
// In the UI we only allow for square shadow map atlas. Here we check if we can fit
// all shadow slices into half resolution of the atlas and adjust height to have tighter packing.
int maximumSlices = (m_ShadowmapWidth / sliceResolution) * (m_ShadowmapHeight / sliceResolution);
if (validShadowCastingLights <= (maximumSlices / 2))
{
m_ShadowmapHeight /= 2;
}
int shadowSlicesPerRow = (atlasWidth / sliceResolution);
float oneOverAtlasWidth = 1.0f / m_ShadowmapWidth;
float oneOverAtlasHeight = 1.0f / m_ShadowmapHeight;
int sliceIndex = 0;
int shadowCastingLightsBufferCount = m_AdditionalShadowCastingLightIndices.Count;
Matrix4x4 sliceTransform = Matrix4x4.identity;
sliceTransform.m00 = sliceResolution * oneOverAtlasWidth;
sliceTransform.m11 = sliceResolution * oneOverAtlasHeight;
for (int i = 0; i < shadowCastingLightsBufferCount; ++i)
{
// we can skip the slice if strength is zero. Some slices with zero
// strength exists when using uniform array path.
if (!m_UseStructuredBuffer && Mathf.Approximately(m_AdditionalLightsShadowParams[i].x, 0.0f))
{
continue;
}
m_AdditionalLightSlices[i].offsetX = (sliceIndex % shadowSlicesPerRow) * sliceResolution;
m_AdditionalLightSlices[i].offsetY = (sliceIndex / shadowSlicesPerRow) * sliceResolution;
m_AdditionalLightSlices[i].resolution = sliceResolution;
sliceTransform.m03 = m_AdditionalLightSlices[i].offsetX * oneOverAtlasWidth;
sliceTransform.m13 = m_AdditionalLightSlices[i].offsetY * oneOverAtlasHeight;
// We bake scale and bias to each shadow map in the atlas in the matrix.
// saves some instructions in shader.
if (m_UseStructuredBuffer)
{
m_AdditionalLightsShadowData[i].worldToShadowMatrix = sliceTransform * m_AdditionalLightsShadowData[i].worldToShadowMatrix;
}
else
{
m_AdditionalLightsWorldToShadow[i] = sliceTransform * m_AdditionalLightsWorldToShadow[i];
}
sliceIndex++;
}
return(true);
}
public bool Setup(ref RenderingData renderingData)
{
if (!renderingData.shadowData.supportsAdditionalLightShadows)
{
return(false);
}
Clear();
m_ShadowmapWidth = renderingData.shadowData.additionalLightsShadowmapWidth;
m_ShadowmapHeight = renderingData.shadowData.additionalLightsShadowmapHeight;
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);
}