public void Render(ScriptableRenderContext loop, CullResults cullResults, out ShadowOutput packedShadows)
{
if (!m_Settings.enabled)
{
ClearPackedShadows(cullResults.visibleLights, out packedShadows);
return;
}
// Pack all shadow quads into the texture
if (!AutoPackLightsIntoShadowTexture(GetInputShadowLightData(cullResults), cullResults.visibleLights, out packedShadows))
{
// No shadowing lights found, so skip all rendering
return;
}
RenderPackedShadows(loop, cullResults, ref packedShadows);
}
//---------------------------------------------------------------------------------------------------------------------------------------------------
// 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();
}
}
//---------------------------------------------------------------------------------------------------------------------------------------------------
bool AutoPackLightsIntoShadowTexture(List <InputShadowLightData> shadowLights, VisibleLight[] lights, out ShadowOutput packedShadows)
{
var activeShadowLights = new Dictionary <int, InputShadowLightData>();
var shadowIndices = new List <int>();
//@TODO: Disallow multiple directional lights
for (int i = 0; i < shadowLights.Count; i++)
{
shadowIndices.Add(shadowLights[i].lightIndex);
activeShadowLights[shadowLights[i].lightIndex] = shadowLights[i];
}
// World's stupidest sheet packer:
// 1. Sort all lights from largest to smallest
// 2. In a left->right, top->bottom pattern, fill quads until you reach the edge of the texture
// 3. Move position to x=0, y=bottomOfFirstTextureInThisRow
// 4. Goto 2.
// Yes, this will produce holes as the quads shrink, but it's good enough for now. I'll work on this more later to fill the gaps.
// Sort all lights from largest to smallest
shadowIndices.Sort(
delegate(int l1, int l2)
{
var nCompare = 0;
// Sort shadow-casting lights by shadow resolution
nCompare = activeShadowLights[l1].shadowResolution.CompareTo(activeShadowLights[l2].shadowResolution); // Sort by shadow size
if (nCompare == 0) // Same, so sort by range to stabilize sort results
{
nCompare = lights[l1].range.CompareTo(lights[l2].range); // Sort by shadow size
}
if (nCompare == 0) // Still same, so sort by instance ID to stabilize sort results
{
nCompare = lights[l1].light.GetInstanceID().CompareTo(lights[l2].light.GetInstanceID());
}
return(nCompare);
}
);
// Start filling lights into texture
var requestedPages = new List <AtlasEntry>();
packedShadows.shadowLights = new ShadowLight[lights.Length];
for (int i = 0; i != shadowIndices.Count; i++)
{
var numShadowSplits = CalculateNumShadowSplits(shadowIndices[i], lights);
packedShadows.shadowLights[shadowIndices[i]].shadowSliceCount = numShadowSplits;
packedShadows.shadowLights[shadowIndices[i]].shadowSliceIndex = requestedPages.Count;
for (int s = 0; s < numShadowSplits; s++)
{
requestedPages.Add(new AtlasEntry(requestedPages.Count, shadowIndices[i]));
}
}
var nCurrentX = 0;
var nCurrentY = -1;
var nNextY = 0;
packedShadows.shadowSlices = new ShadowSliceData[requestedPages.Count];
packedShadows.directionalShadowSplitSphereSqr = new Vector4[4];
foreach (var entry in requestedPages)
{
var shadowResolution = activeShadowLights[entry.lightIndex].shadowResolution;
// Check if first texture is too wide
if (nCurrentY == -1)
{
if ((shadowResolution > m_Settings.shadowAtlasWidth) || (shadowResolution > m_Settings.shadowAtlasHeight))
{
Debug.LogError("ERROR! Shadow packer ran out of space in the " + m_Settings.shadowAtlasWidth + "x" + m_Settings.shadowAtlasHeight + " texture!\n\n");
m_FailedToPackLastTime = true;
ClearPackedShadows(lights, out packedShadows);
return(false);
}
}
// Goto next scanline
if ((nCurrentY == -1) || ((nCurrentX + shadowResolution) > m_Settings.shadowAtlasWidth))
{
nCurrentX = 0;
nCurrentY = nNextY;
nNextY += shadowResolution;
}
// Check if we've run out of space
if ((nCurrentY + shadowResolution) > m_Settings.shadowAtlasHeight)
{
Debug.LogError("ERROR! Shadow packer ran out of space in the " + m_Settings.shadowAtlasWidth + "x" + m_Settings.shadowAtlasHeight + " texture!\n\n");
m_FailedToPackLastTime = true;
ClearPackedShadows(lights, out packedShadows);
return(false);
}
// Save location to light
packedShadows.shadowSlices[entry.splitIndex].atlasX = nCurrentX;
packedShadows.shadowSlices[entry.splitIndex].atlasY = nCurrentY;
packedShadows.shadowSlices[entry.splitIndex].shadowResolution = shadowResolution;
// Move ahead
nCurrentX += shadowResolution;
//Debug.Log( "Sheet packer: " + vl.m_cachedLight.name + " ( " + vl.m_shadowX + ", " + vl.m_shadowY + " ) " + vl.m_shadowResolution + "\n\n" );
}
if (m_FailedToPackLastTime)
{
m_FailedToPackLastTime = false;
Debug.Log("SUCCESS! Shadow packer can now fit all lights into the " + m_Settings.shadowAtlasWidth + "x" + m_Settings.shadowAtlasHeight + " texture!\n\n");
}
return(requestedPages.Count != 0);
}
public static void ClearPackedShadows(VisibleLight[] lights, out ShadowOutput packedShadows)
{
packedShadows.directionalShadowSplitSphereSqr = null;
packedShadows.shadowSlices = null;
packedShadows.shadowLights = new ShadowLight[lights.Length];
}
