static void PrepareCascades()
{
bool stabilize = true;
for (int i = 0; i < 4; i++)
{
++FramesSinceUpdate[i];
}
CascadeLightDirection[0] = MyEnvironment.DirectionalLightDir;
CascadeLightDirection[1] = MyEnvironment.DirectionalLightDir;
const float DirectionDifferenceThreshold = 0.02f;
if (FramesSinceUpdate[2] > 180 || MyEnvironment.DirectionalLightDir.Dot(CascadeLightDirection[2]) < (1 - DirectionDifferenceThreshold))
{
FramesSinceUpdate[2] = 0;
CascadeLightDirection[2] = MyEnvironment.DirectionalLightDir;
}
if (FramesSinceUpdate[3] > 180 || MyEnvironment.DirectionalLightDir.Dot(CascadeLightDirection[3]) < (1 - DirectionDifferenceThreshold))
{
FramesSinceUpdate[3] = 0;
CascadeLightDirection[3] = MyEnvironment.DirectionalLightDir;
}
var globalMatrix = CreateGlobalMatrix();
Matrix[] cascadesMatrices = new Matrix[8];
var cascadeFrozen = MyRender11.Settings.FreezeCascade.Any(x => x == true);
if (!cascadeFrozen)
{
m_oldView = MyEnvironment.View;
}
float cascadesNearClip = 1f;
float cascadesFarClip = 1000f;
float backOffset = 100f; // more and fit projection to objects inside
float shadowmapSize = m_cascadeResolution;
m_splitDepth[0] = cascadesNearClip;
m_splitDepth[1] = MyRender11.Settings.CascadesSplit0;
m_splitDepth[2] = MyRender11.Settings.CascadesSplit1;
m_splitDepth[3] = MyRender11.Settings.CascadesSplit2;
m_splitDepth[4] = MyRender11.Settings.CascadesSplit3;
float unitWidth = 1 / MyEnvironment.Projection.M11;
float unitHeight = 1 / MyEnvironment.Projection.M22;
var vertices = new Vector3[]
{
new Vector3( -unitWidth, -unitHeight, -1),
new Vector3( -unitWidth, unitHeight, -1),
new Vector3( unitWidth, unitHeight, -1),
new Vector3( unitWidth, -unitHeight, -1),
};
var frustumVerticesWS = new Vector3[8];
for (int c = 0; c < m_cascadesNum; c++)
{
for (int i = 0; i < 4; i++) {
frustumVerticesWS[i] = vertices[i] * m_splitDepth[c];
frustumVerticesWS[i + 4] = vertices[i] * m_splitDepth[c + 1];
}
if (MyRender11.Settings.FreezeCascade[c])
{
// draw cascade bounding primtiive
if (VisualizeDebug)
{
var invView = Matrix.Invert(m_oldView);
Vector3.Transform(frustumVerticesWS, ref invView, frustumVerticesWS);
var batch = MyLinesRenderer.CreateBatch();
batch.Add6FacedConvex(frustumVerticesWS, Color.Blue);
var bs = BoundingSphere.CreateFromPoints(frustumVerticesWS);
var bb = BoundingBox.CreateFromSphere(bs);
batch.AddBoundingBox(bb, Color.OrangeRed);
batch.Commit();
}
continue;
}
/*
* Cascades update scheme:
* 0: 1 1 1 1
* 1: 1 0 1 0
* 2: 0 1 0 0
* 3: 0 0 0 1
*/
bool skipCascade1 = c == 1 && (MyCommon.FrameCounter % 2) != 0;
bool skipCascade2 = c == 2 && (MyCommon.FrameCounter % 4) != 1;
bool skipCascade3 = c == 3 && (MyCommon.FrameCounter % 4) != 3;
//
if (skipCascade1 || skipCascade2 || skipCascade3)
{
if (!MyRender11.Settings.UpdateCascadesEveryFrame)
{
continue;
}
}
Vector3.Transform(frustumVerticesWS, ref MyEnvironment.InvView, frustumVerticesWS);
var bSphere = BoundingSphere.CreateFromPoints(frustumVerticesWS);
if (stabilize)
{
bSphere.Center = bSphere.Center.Round();
bSphere.Radius = (float)Math.Ceiling(bSphere.Radius);
}
var offset = bSphere.Radius + cascadesNearClip + backOffset;
var shadowCameraPosWS = bSphere.Center + CascadeLightDirection[c] * (bSphere.Radius + cascadesNearClip);
var lightView = VRageMath.Matrix.CreateLookAt(shadowCameraPosWS, shadowCameraPosWS - CascadeLightDirection[c], Math.Abs(Vector3.UnitY.Dot(CascadeLightDirection[c])) < 0.99f ? Vector3.UnitY : Vector3.UnitX);
Vector3 vMin = new Vector3(-bSphere.Radius, -bSphere.Radius, cascadesNearClip);
Vector3 vMax = new Vector3(bSphere.Radius, bSphere.Radius, offset + bSphere.Radius);
var cascadeProjection = Matrix.CreateOrthographicOffCenter(vMin.X, vMax.X, vMin.Y, vMax.Y, vMax.Z, vMin.Z);
cascadesMatrices[c] = lightView * cascadeProjection;
var transformed = Vector3.Transform(Vector3.Zero, ref cascadesMatrices[c]) * shadowmapSize / 2;
var smOffset = (transformed.Round() - transformed) * 2 / shadowmapSize;
// stabilize 1st cascade only
if (stabilize)
{
cascadeProjection.M41 += smOffset.X;
cascadeProjection.M42 += smOffset.Y;
cascadesMatrices[c] = lightView * cascadeProjection;
}
var inverseCascadeMatrix = Matrix.Invert(cascadesMatrices[c]);
var corner0 = Vector3.Transform(Vector3.Transform(new Vector3(-1, -1, 0), inverseCascadeMatrix), globalMatrix);
var corner1 = Vector3.Transform(Vector3.Transform(new Vector3(1, 1, 1), inverseCascadeMatrix), globalMatrix);
var d = corner1 - corner0;
var cascadeScale = 1f / (corner1 - corner0);
m_cascadeScale[c] = new Vector4(cascadeScale, 0);
var query = new MyShadowmapQuery();
query.DepthBuffer = m_cascadeShadowmapArray.SubresourceDsv(c);
query.Viewport = new MyViewport(shadowmapSize, shadowmapSize);
m_cascadeInfo[c].WorldCameraOffsetPosition = MyEnvironment.CameraPosition;
m_cascadeInfo[c].WorldToProjection = cascadesMatrices[c];
// todo: skip translation, recalculate matrix in local space, keep world space matrix only for bounding frustum
m_cascadeInfo[c].LocalToProjection = Matrix.CreateTranslation(MyEnvironment.CameraPosition) * cascadesMatrices[c];
query.ProjectionInfo = m_cascadeInfo[c];
query.ProjectionDir = CascadeLightDirection[c];
query.ProjectionFactor = shadowmapSize * shadowmapSize / (bSphere.Radius * bSphere.Radius * 4);
if (c == 0)
query.QueryType = MyFrustumEnum.Cascade0;
if (c == 1)
query.QueryType = MyFrustumEnum.Cascade1;
if (c == 2)
query.QueryType = MyFrustumEnum.Cascade2;
if (c == 3)
query.QueryType = MyFrustumEnum.Cascade3;
m_shadowmapQueries.Add(query);
}
if (true)
{
var verticesWS = new Vector3[8];
var batch = MyLinesRenderer.CreateBatch();
var cascadeColor = new[]
{
Color.Red,
Color.Green,
Color.Blue,
Color.Yellow
};
for (int c = 0; c < m_cascadesNum; c++)
{
if (MyRender11.Settings.FreezeCascade[c])
{
if (VisualizeDebug)
{
var inverseViewProj = Matrix.Invert(cascadesMatrices[c]);
Vector3.Transform(m_cornersCS, ref inverseViewProj, verticesWS);
for (int i = 0; i < verticesWS.Length; i++ )
{
verticesWS[i] += MyEnvironment.CameraPosition;
}
MyPrimitivesRenderer.Draw6FacedConvex(verticesWS, cascadeColor[c], 0.2f);
batch.Add6FacedConvex(verticesWS, Color.Pink);
}
}
}
batch.Commit();
}
var mapping = MyMapping.MapDiscard(m_csmConstants);
for (int c = 0; c < m_cascadesNum; c++) {
mapping.stream.Write(Matrix.Transpose(m_cascadeInfo[c].CurrentLocalToProjection * MyMatrixHelpers.ClipspaceToTexture));
}
for (int i = m_cascadesNum; i < 8; i++)
mapping.stream.Write(Matrix.Zero);
for (int i = 0; i < m_splitDepth.Length; i++)
mapping.stream.Write(m_splitDepth[i]);
for (int i = m_splitDepth.Length; i < 8; i++)
mapping.stream.Write(0.0f);
for (int i = 0; i < 4; i++)
mapping.stream.Write(m_cascadeScale[i] / m_cascadeScale[0]);
mapping.Unmap();
}
/// <summary>
/// Creates shadowmap queries and appends them to the provided list
/// </summary>
internal unsafe void PrepareQueries(List<MyShadowmapQuery> appendShadowmapQueries)
{
Debug.Assert(appendShadowmapQueries != null, "Shadowmap query list cannot be null!");
if (!MyRenderProxy.Settings.EnableShadows)
return;
MyImmediateRC.RC.BeginProfilingBlock("PrepareCascades");
MyImmediateRC.RC.DeviceContext.CopyResource(m_cascadeShadowmapArray.Resource, m_cascadeShadowmapBackup.Resource);
bool stabilize = true;
const float DirectionDifferenceThreshold = 0.0175f;
float shadowChangeDelayMultiplier = 180;
for (int cascadeIndex = 0; cascadeIndex < m_initializedShadowCascadesCount; ++cascadeIndex)
{
++m_shadowCascadeFramesSinceLightUpdate[cascadeIndex];
if (m_shadowCascadeFramesSinceLightUpdate[cascadeIndex] > cascadeIndex * shadowChangeDelayMultiplier ||
MyEnvironment.DirectionalLightDir.Dot(m_shadowCascadeLightDirections[cascadeIndex]) < (1 - DirectionDifferenceThreshold))
{
m_shadowCascadeLightDirections[cascadeIndex] = MyEnvironment.DirectionalLightDir;
m_shadowCascadeFramesSinceLightUpdate[cascadeIndex] = 0;
}
}
var globalMatrix = CreateGlobalMatrix();
var cascadeFrozen = MyRenderProxy.Settings.ShadowCascadeFrozen.Any(x => x == true);
if (!cascadeFrozen)
m_oldView = MyEnvironment.View;
float cascadesNearClip = 1f;
float backOffset = MyRender11.RenderSettings.ShadowQuality.BackOffset();
float shadowmapSize = MyRender11.RenderSettings.ShadowQuality.ShadowCascadeResolution();
for (int cascadeIndex = 0; cascadeIndex < ShadowCascadeSplitDepths.Length; ++cascadeIndex)
ShadowCascadeSplitDepths[cascadeIndex] = MyRender11.RenderSettings.ShadowQuality.ShadowCascadeSplit(cascadeIndex);
double unitWidth = 1.0 / MyEnvironment.Projection.M11;
double unitHeight = 1.0 / MyEnvironment.Projection.M22;
Vector3D* untransformedVertices = stackalloc Vector3D[4];
untransformedVertices[0] = new Vector3D(-unitWidth, -unitHeight, -1);
untransformedVertices[1] = new Vector3D(-unitWidth, unitHeight, -1);
untransformedVertices[2] = new Vector3D(unitWidth, unitHeight, -1);
untransformedVertices[3] = new Vector3D(unitWidth, -unitHeight, -1);
MatrixD* cascadesMatrices = stackalloc MatrixD[MaxShadowCascades];
for (int cascadeIndex = 0; cascadeIndex < m_initializedShadowCascadesCount; ++cascadeIndex)
{
for (int vertexIndex = 0; vertexIndex < 4; ++vertexIndex)
{
m_frustumVerticesWS[vertexIndex] = untransformedVertices[vertexIndex] * ShadowCascadeSplitDepths[cascadeIndex];
m_frustumVerticesWS[vertexIndex + 4] = untransformedVertices[vertexIndex] * ShadowCascadeSplitDepths[cascadeIndex + 1];
}
if (MyRender11.Settings.ShadowCascadeFrozen[cascadeIndex])
{
// draw cascade bounding primtiive
if (VISUALIZE_DEBUG)
{
var oldInvView = MatrixD.Invert(m_oldView);
Vector3D.Transform(m_frustumVerticesWS, ref oldInvView, m_frustumVerticesWS);
var verticesF = new Vector3[8];
for (int i = 0; i < 8; i++)
{
verticesF[i] = m_frustumVerticesWS[i];
}
var batch = MyLinesRenderer.CreateBatch();
batch.Add6FacedConvex(verticesF, Color.Blue);
var bs = BoundingSphere.CreateFromPoints(verticesF);
var bb = BoundingBox.CreateFromSphere(bs);
batch.AddBoundingBox(bb, Color.OrangeRed);
batch.Commit();
}
continue;
}
bool skipCascade = MyCommon.FrameCounter % (ulong)m_shadowCascadeUpdateIntervals[cascadeIndex].Item1 != (ulong)m_shadowCascadeUpdateIntervals[cascadeIndex].Item2;
bool forceUpdate = ShadowCascadeSplitDepths[cascadeIndex] > 1000f && Vector3D.DistanceSquared(m_shadowCascadeUpdatePositions[cascadeIndex], MyEnvironment.CameraPosition) > Math.Pow(1000, 2);
//
if (!forceUpdate && skipCascade && !MyRenderProxy.Settings.UpdateCascadesEveryFrame)
continue;
m_shadowCascadeUpdatePositions[cascadeIndex] = MyEnvironment.CameraPosition;
MatrixD invView = MyEnvironment.InvView;
Vector3D.Transform(m_frustumVerticesWS, ref invView, m_frustumVerticesWS);
var bSphere = BoundingSphereD.CreateFromPoints(m_frustumVerticesWS);
if (stabilize)
{
bSphere.Center = bSphere.Center.Round();
bSphere.Radius = Math.Ceiling(bSphere.Radius);
}
var shadowCameraPosWS = bSphere.Center + m_shadowCascadeLightDirections[cascadeIndex] * (bSphere.Radius + cascadesNearClip);
var lightView = VRageMath.MatrixD.CreateLookAt(shadowCameraPosWS, shadowCameraPosWS - m_shadowCascadeLightDirections[cascadeIndex], Math.Abs(Vector3.UnitY.Dot(m_shadowCascadeLightDirections[cascadeIndex])) < 0.99f ? Vector3.UnitY : Vector3.UnitX);
var offset = bSphere.Radius + cascadesNearClip + backOffset;
Vector3D vMin = new Vector3D(-bSphere.Radius, -bSphere.Radius, cascadesNearClip);
Vector3D vMax = new Vector3D(bSphere.Radius, bSphere.Radius, offset + bSphere.Radius);
var cascadeProjection = MatrixD.CreateOrthographicOffCenter(vMin.X, vMax.X, vMin.Y, vMax.Y, vMax.Z, vMin.Z);
cascadesMatrices[cascadeIndex] = lightView * cascadeProjection;
var transformed = Vector3D.Transform(Vector3D.Zero, cascadesMatrices[cascadeIndex]) * shadowmapSize / 2;
var smOffset = (transformed.Round() - transformed) * 2 / shadowmapSize;
// stabilize 1st cascade only
if (stabilize)
{
cascadeProjection.M41 += smOffset.X;
cascadeProjection.M42 += smOffset.Y;
cascadesMatrices[cascadeIndex] = lightView * cascadeProjection;
}
var inverseCascadeMatrix = MatrixD.Invert(cascadesMatrices[cascadeIndex]);
var corner0 = Vector3D.Transform(Vector3D.Transform(new Vector3D(-1, -1, 0), inverseCascadeMatrix), globalMatrix);
var corner1 = Vector3D.Transform(Vector3D.Transform(new Vector3D(1, 1, 1), inverseCascadeMatrix), globalMatrix);
var diameter = corner1 - corner0;
var cascadeScale = 1f / diameter;
ShadowCascadeScales[cascadeIndex] = new Vector4D(cascadeScale, 0);
var query = new MyShadowmapQuery();
query.DepthBuffer = m_cascadeShadowmapArray.SubresourceDsv(cascadeIndex);
query.Viewport = new MyViewport(shadowmapSize, shadowmapSize);
m_cascadeInfo[cascadeIndex].WorldCameraOffsetPosition = MyEnvironment.CameraPosition;
m_cascadeInfo[cascadeIndex].WorldToProjection = cascadesMatrices[cascadeIndex];
// todo: skip translation, recalculate matrix in local space, keep world space matrix only for bounding frustum
m_cascadeInfo[cascadeIndex].LocalToProjection = Matrix.CreateTranslation(MyEnvironment.CameraPosition) * cascadesMatrices[cascadeIndex];
query.ProjectionInfo = m_cascadeInfo[cascadeIndex];
query.ProjectionDir = m_shadowCascadeLightDirections[cascadeIndex];
query.ProjectionFactor = (float)(shadowmapSize * shadowmapSize / (bSphere.Radius * bSphere.Radius * 4));
query.QueryType = MyFrustumEnum.ShadowCascade;
query.CascadeIndex = cascadeIndex;
appendShadowmapQueries.Add(query);
}
if (VISUALIZE_DEBUG)
DebugDrawFrozen(cascadesMatrices);
FillConstantBuffer(m_csmConstants);
MyImmediateRC.RC.EndProfilingBlock();
}
static void PrepareSpotlights()
{
MyLights.SpotlightsBvh.OverlapAllFrustum(ref MyEnvironment.ViewFrustum, MyLightRendering.VisibleSpotlights);
MyArrayHelpers.Reserve(ref MyLightRendering.Spotlights, MyLightRendering.VisibleSpotlights.Count);
int index = 0;
int casterIndex = 0;
foreach (var id in MyLightRendering.VisibleSpotlights)
{
MyLights.WriteSpotlightConstants(id, ref MyLightRendering.Spotlights[index]);
if (id.CastsShadows)
{
var query = new MyShadowmapQuery();
if(MyLights.IgnoredEntitites.ContainsKey(id))
{
query.IgnoredEntities = MyLights.IgnoredEntitites[id];
}
var shadowMatrix = Matrix.CreateLookAt(id.Position, id.Position + MyLights.Spotlights[id.Index].Direction, MyLights.Spotlights[id.Index].Up) *
Matrix.CreatePerspectiveFieldOfView((float)(Math.Acos(MyLights.Spotlights[id.Index].ApertureCos) * 2), 1.0f, 0.5f, id.ShadowDistance);
if(ShadowmapsPool.Count <= casterIndex)
{
ShadowmapsPool.Add(MyRwTextures.CreateShadowmap(512, 512));
}
query.DepthBuffer = ShadowmapsPool[casterIndex].Dsv;
query.Viewport = new MyViewport(512, 512);
query.QueryType = MyFrustumEnum.ShadowProjection;
query.ProjectionInfo = new MyProjectionInfo
{
WorldCameraOffsetPosition = MyEnvironment.CameraPosition,
WorldToProjection = shadowMatrix,
LocalToProjection = Matrix.CreateTranslation(MyEnvironment.CameraPosition) * shadowMatrix
};
MyLightRendering.Spotlights[index].ShadowMatrix = Matrix.Transpose(query.ProjectionInfo.CurrentLocalToProjection * MyMatrixHelpers.ClipspaceToTexture);
m_shadowmapQueries.Add(query);
casterIndex++;
}
index++;
}
}