//---------------------------------------------------------------------------------------------------------------------------------------------------
// Render shadows
//---------------------------------------------------------------------------------------------------------------------------------------------------
void RenderPackedShadows(ScriptableRenderContext loop, CullResults cullResults, ref ShadowOutput packedShadows)
{
var setRenderTargetCommandBuffer = new CommandBuffer();
setRenderTargetCommandBuffer.name = "Render packed shadows";
setRenderTargetCommandBuffer.GetTemporaryRT(m_ShadowTexName, m_Settings.shadowAtlasWidth, m_Settings.shadowAtlasHeight, k_DepthBuffer, FilterMode.Bilinear, RenderTextureFormat.Shadowmap, RenderTextureReadWrite.Linear);
setRenderTargetCommandBuffer.SetRenderTarget(new RenderTargetIdentifier(m_ShadowTexName));
setRenderTargetCommandBuffer.ClearRenderTarget(true, true, Color.green);
loop.ExecuteCommandBuffer(setRenderTargetCommandBuffer);
setRenderTargetCommandBuffer.Dispose();
VisibleLight[] visibleLights = cullResults.visibleLights;
var shadowSlices = packedShadows.shadowSlices;
// Render each light's shadow buffer into a subrect of the shared depth texture
for (int lightIndex = 0; lightIndex < packedShadows.shadowLights.Length; lightIndex++)
{
int shadowSliceCount = packedShadows.shadowLights[lightIndex].shadowSliceCount;
if (shadowSliceCount == 0)
{
continue;
}
Profiler.BeginSample("Shadows.GetShadowCasterBounds");
Bounds bounds;
if (!cullResults.GetShadowCasterBounds(lightIndex, out bounds))
{
Profiler.EndSample();
continue;
}
Profiler.EndSample();
Profiler.BeginSample("Shadows.DrawShadows");
Matrix4x4 proj;
Matrix4x4 view;
var lightType = visibleLights[lightIndex].lightType;
var lightDirection = visibleLights[lightIndex].light.transform.forward;
int shadowSliceIndex = packedShadows.GetShadowSliceIndex(lightIndex, 0);
if (lightType == LightType.Spot)
{
var settings = new DrawShadowsSettings(cullResults, lightIndex);
bool needRendering = cullResults.ComputeSpotShadowMatricesAndCullingPrimitives(lightIndex, out view, out proj, out settings.splitData);
SetupShadowSplitMatrices(ref packedShadows.shadowSlices[shadowSliceIndex], proj, view);
if (needRendering)
{
RenderShadowSplit(ref shadowSlices[shadowSliceIndex], lightDirection, proj, view, ref loop, settings);
}
}
else if (lightType == LightType.Directional)
{
Vector3 splitRatio = m_Settings.directionalLightCascades;
for (int s = 0; s < 4; ++s)
{
packedShadows.directionalShadowSplitSphereSqr[s] = new Vector4(0, 0, 0, float.NegativeInfinity);
}
for (int s = 0; s < shadowSliceCount; ++s, shadowSliceIndex++)
{
var settings = new DrawShadowsSettings(cullResults, lightIndex);
var shadowResolution = shadowSlices[shadowSliceIndex].shadowResolution;
bool needRendering = cullResults.ComputeDirectionalShadowMatricesAndCullingPrimitives(lightIndex, s, shadowSliceCount, splitRatio,
shadowResolution, m_Settings.directionalLightNearPlaneOffset, out view, out proj, out settings.splitData);
packedShadows.directionalShadowSplitSphereSqr[s] = settings.splitData.cullingSphere;
packedShadows.directionalShadowSplitSphereSqr[s].w *= packedShadows.directionalShadowSplitSphereSqr[s].w;
SetupShadowSplitMatrices(ref shadowSlices[shadowSliceIndex], proj, view);
if (needRendering)
{
RenderShadowSplit(ref shadowSlices[shadowSliceIndex], lightDirection, proj, view, ref loop, settings);
}
}
}
else if (lightType == LightType.Point)
{
for (int s = 0; s < shadowSliceCount; ++s, shadowSliceIndex++)
{
var settings = new DrawShadowsSettings(cullResults, lightIndex);
bool needRendering = cullResults.ComputePointShadowMatricesAndCullingPrimitives(lightIndex, (CubemapFace)s, 2.0f, out view, out proj, out settings.splitData);
// The view matrix for point lights flips primitives. We fix it here (by making it left-handed).
view.SetRow(1, -view.GetRow(1));
SetupShadowSplitMatrices(ref shadowSlices[shadowSliceIndex], proj, view);
if (needRendering)
{
RenderShadowSplit(ref shadowSlices[shadowSliceIndex], lightDirection, proj, view, ref loop, settings);
}
}
}
Profiler.EndSample();
}
}
public bool ComputePointShadowMatricesAndCullingPrimitives(int activeLightIndex, CubemapFace cubemapFace, float fovBias, out Matrix4x4 viewMatrix, out Matrix4x4 projMatrix, out ShadowSplitData shadowSplitData)
{
return(CullResults.ComputePointShadowMatricesAndCullingPrimitives(this.cullResults, activeLightIndex, cubemapFace, fovBias, out viewMatrix, out projMatrix, out shadowSplitData));
}