void RenderMainLightCascadeShadowmap(ref ScriptableRenderContext context, ref CullResults cullResults, ref LightData lightData, ref ShadowData shadowData)
{
int shadowLightIndex = lightData.mainLightIndex;
if (shadowLightIndex == -1)
{
return;
}
VisibleLight shadowLight = lightData.visibleLights[shadowLightIndex];
Light light = shadowLight.light;
Debug.Assert(shadowLight.lightType == LightType.Directional);
if (light.shadows == LightShadows.None)
{
return;
}
Bounds bounds;
if (!cullResults.GetShadowCasterBounds(shadowLightIndex, out bounds))
{
return;
}
CommandBuffer cmd = CommandBufferPool.Get(k_RenderMainLightShadowmapTag);
using (new ProfilingSample(cmd, k_RenderMainLightShadowmapTag))
{
m_ShadowCasterCascadesCount = shadowData.mainLightShadowCascadesCount;
int shadowResolution = ShadowUtils.GetMaxTileResolutionInAtlas(shadowData.mainLightShadowmapWidth, shadowData.mainLightShadowmapHeight, m_ShadowCasterCascadesCount);
float shadowNearPlane = light.shadowNearPlane;
Matrix4x4 view, proj;
var settings = new DrawShadowsSettings(cullResults, shadowLightIndex);
m_MainLightShadowmapTexture = RenderTexture.GetTemporary(shadowData.mainLightShadowmapWidth,
shadowData.mainLightShadowmapHeight, k_ShadowmapBufferBits, m_ShadowmapFormat);
m_MainLightShadowmapTexture.filterMode = FilterMode.Bilinear;
m_MainLightShadowmapTexture.wrapMode = TextureWrapMode.Clamp;
SetRenderTarget(cmd, m_MainLightShadowmapTexture, RenderBufferLoadAction.DontCare,
RenderBufferStoreAction.Store, ClearFlag.Depth, Color.black, TextureDimension.Tex2D);
bool success = false;
for (int cascadeIndex = 0; cascadeIndex < m_ShadowCasterCascadesCount; ++cascadeIndex)
{
success = ShadowUtils.ExtractDirectionalLightMatrix(ref cullResults, ref shadowData, shadowLightIndex, cascadeIndex, shadowResolution, shadowNearPlane, out m_CascadeSplitDistances[cascadeIndex], out m_CascadeSlices[cascadeIndex], out view, out proj);
if (success)
{
settings.splitData.cullingSphere = m_CascadeSplitDistances[cascadeIndex];
ShadowUtils.SetupShadowCasterConstants(cmd, ref shadowLight, proj, shadowResolution);
ShadowUtils.RenderShadowSlice(cmd, ref context, ref m_CascadeSlices[cascadeIndex], ref settings, proj, view);
}
}
if (success)
{
SetupMainLightShadowReceiverConstants(cmd, ref shadowData, shadowLight);
}
}
context.ExecuteCommandBuffer(cmd);
CommandBufferPool.Release(cmd);
}
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);
ShadowUtils.SetupShadowCasterConstants(cmd, ref shadowLight, proj, sliceResolution);
ShadowUtils.RenderShadowSlice(cmd, ref context, ref m_AdditionalLightSlices[i], ref settings, proj, view);
}
}
SetupAdditionalLightsShadowReceiverConstants(cmd, ref shadowData);
}
context.ExecuteCommandBuffer(cmd);
CommandBufferPool.Release(cmd);
}
