public void AddShadowMap(ShadowMap shadowMap)
{
shadowMaps.Add(shadowMap);
shadowMap.Passes = new RenderPass[shadowMap.LevelCount];
shadowMap.Plugins = new RenderTargetsPlugin[shadowMap.LevelCount];
for (int i = 0; i < shadowMap.Passes.Length; i++)
{
shadowMap.Passes[i] = new RenderPass(string.Format("Pass {0}", i))
{
Parameters = new ParameterCollection(string.Format("Parameters ShadowMap {0}", i))
};
shadowMap.Passes[i].Parameters.AddSources(MainPlugin.ViewParameters);
shadowMap.Passes[i].Parameters.AddSources(shadowMap.CasterParameters);
unsafe
{
int currentPassIndex = i;
shadowMap.Passes[i].Parameters.AddDynamic(TransformationKeys.ViewProjection,
ParameterDynamicValue.New(LightingPlugin.ViewProjectionArray, (ref ShadowMapData input, ref Matrix output) =>
{
fixed(Matrix * vpPtr = &input.ViewProjCaster0)
{
output = vpPtr[currentPassIndex];
}
}));
shadowMap.Passes[i].Parameters.AddDynamic(LightingPlugin.ShadowLightOffset,
ParameterDynamicValue.New(LightingPlugin.ViewProjectionArray, (ref ShadowMapData input, ref Vector3 output) =>
{
fixed(Vector3 * vpPtr = &input.Offset0)
{
output = vpPtr[currentPassIndex];
}
}));
}
shadowMap.Plugins[i] = new RenderTargetsPlugin
{
Services = Services,
EnableClearTarget = false,
EnableClearDepth = false,
RenderPass = shadowMap.Passes[i],
RenderTarget = null,
};
shadowMap.Plugins[i].Apply();
}
RenderPass.Passes.InsertRange(0, shadowMap.Passes);
// Dynamic value used for ViewProjectionArray key
var dynamicViewProjectionArray = ParameterDynamicValue.New(
TransformationKeys.View, TransformationKeys.Projection, LightKeys.LightDirection, LightKeys.LightColor, LightingPlugin.Offsets, (ref Matrix view, ref Matrix projection, ref Vector3 lightDirection, ref Color3 lightColor, ref Vector3[] offsets, ref ShadowMapData result) =>
{
if (projections == null)
{
// Preallocates temporary variables (thread static)
projections = new Matrix[4];
views = new Matrix[4];
shadowsViewProj = new Matrix[8];
points = new Vector3[8];
directions = new Vector3[4];
}
Matrix inverseView, inverseProjection;
Matrix.Invert(ref projection, out inverseProjection);
Matrix.Invert(ref view, out inverseView);
// Frustum in World Space
for (int i = 0; i < 8; ++i)
{
Vector3.TransformCoordinate(ref FrustrumBasePoints[i], ref inverseProjection, out points[i]);
}
for (int i = 0; i < 4; i++)
{
directions[i] = Vector3.Normalize(points[i + 4] - points[i]);
}
// TODO Make these factors configurable. They need also to be correctly tweaked.
float shadowDistribute = 1.0f / shadowMap.LevelCount;
float znear = 1.0f;
float zfar = shadowMap.ShadowDistance;
var shadowOffsets = new Vector3[shadowMap.LevelCount];
var boudingBoxVectors = new Vector3[shadowMap.LevelCount * 2];
var direction = Vector3.Normalize(lightDirection);
// Fake value
// It will be setup by next loop
Vector3 side = Vector3.UnitX;
Vector3 up = Vector3.UnitX;
// Select best Up vector
foreach (var vectorUp in VectorUps)
{
if (Vector3.Dot(direction, vectorUp) < (1.0 - 0.0001))
{
side = Vector3.Normalize(Vector3.Cross(vectorUp, direction));
up = Vector3.Normalize(Vector3.Cross(direction, side));
break;
}
}
for (int cascadeLevel = 0; cascadeLevel < shadowMap.LevelCount; ++cascadeLevel)
{
float k0 = (float)(cascadeLevel + 0) / shadowMap.LevelCount;
float k1 = (float)(cascadeLevel + 1) / shadowMap.LevelCount;
float min = (float)(znear * Math.Pow(zfar / znear, k0)) * (1.0f - shadowDistribute) + (znear + (zfar - znear) * k0) * shadowDistribute;
float max = (float)(znear * Math.Pow(zfar / znear, k1)) * (1.0f - shadowDistribute) + (znear + (zfar - znear) * k1) * shadowDistribute;
for (int j = 0; j < shadowMap.LevelCount; j++)
{
boudingBoxVectors[j] = points[j] + directions[j] * min;
boudingBoxVectors[j + shadowMap.LevelCount] = points[j] + directions[j] * max;
}
var boundingBox = BoundingBox.FromPoints(boudingBoxVectors);
var radius = (boundingBox.Maximum - boundingBox.Minimum).Length() * 0.5f;
var target = Vector3.TransformCoordinate(boundingBox.Center, inverseView);
// Snap camera to texel units (so that shadow doesn't jitter)
var shadowMapHalfSize = shadowMap.ShadowMapSize * 0.5f;
float x = (float)Math.Ceiling(Vector3.Dot(target, up) * shadowMapHalfSize / radius) * radius / shadowMapHalfSize;
float y = (float)Math.Ceiling(Vector3.Dot(target, side) * shadowMapHalfSize / radius) * radius / shadowMapHalfSize;
float z = Vector3.Dot(target, direction);
//target = up * x + side * y + direction * R32G32B32_Float.Dot(target, direction);
target = up * x + side * y + direction * z;
views[cascadeLevel] = Matrix.LookAtLH(target - direction * zfar * 0.5f, target + direction * zfar * 0.5f, up); // View;
projections[cascadeLevel] = Matrix.OrthoOffCenterLH(-radius, radius, -radius, radius, znear / zfar, zfar); // Projection
//float leftX = shadowMap.Level == CascadeShadowMapLevel.X1 ? 0.5f : 0.25f;
//float leftY = shadowMap.Level == CascadeShadowMapLevel.X4 ? 0.25f : 0.5f;
//float centerX = 0.5f * (cascadeLevel % 2) + leftX;
//float centerY = 0.5f * (cascadeLevel / 2) + leftY;
var cascadeTextureCoords = shadowMap.TextureCoordsBorder[cascadeLevel];
float leftX = (float)shadowMap.ShadowMapSize / (float)AtlasSize * 0.5f;
float leftY = (float)shadowMap.ShadowMapSize / (float)AtlasSize * 0.5f;
float centerX = 0.5f * (cascadeTextureCoords.X + cascadeTextureCoords.Z);
float centerY = 0.5f * (cascadeTextureCoords.Y + cascadeTextureCoords.W);
shadowsViewProj[cascadeLevel] = views[cascadeLevel] * projections[cascadeLevel];
shadowsViewProj[cascadeLevel + 4] = shadowsViewProj[cascadeLevel]
* Matrix.Scaling(leftX, -leftY, 0.5f) // Texture0 mapping offsets/scaling
* Matrix.Translation(centerX, centerY, 0.5f);
var shadowVInverse = Matrix.Invert(views[cascadeLevel]);
shadowOffsets[cascadeLevel] = new Vector3(shadowVInverse.M41, shadowVInverse.M42, shadowVInverse.M43);
}
result.LightColor = lightColor;
unsafe
{
fixed(Matrix * resultPtr = &result.ViewProjCaster0)
Utilities.Write((IntPtr)resultPtr, shadowsViewProj, 0, shadowsViewProj.Length);
fixed(Vector3 * resultPtr = &result.Offset0)
Utilities.Write((IntPtr)resultPtr, shadowOffsets, 0, shadowOffsets.Length);
}
});
shadowMap.Parameters.SetDefault(LightKeys.LightDirection);
shadowMap.Parameters.SetDefault(Offsets);
shadowMap.Parameters.SetDefault(ViewProjectionArray);
shadowMap.Parameters.AddDynamic(ViewProjectionArray, dynamicViewProjectionArray);
shadowMap.CasterParameters.Set(EffectPlugin.RasterizerStateKey, null);
shadowMap.Texture = shadowMap.Filter is ShadowMapFilterVsm ? ShadowMapVsm : ShadowMapDepth.Texture;
}
public void RemoveShadowMap(ShadowMap shadowMap)
{
shadowMaps.Remove(shadowMap);
RenderPass.Passes.RemoveAll(shadowMap.Passes.Contains);
}
public ShadowMapFilterVsm(ShadowMap shadowMap)
: base(shadowMap)
{
MinVariance = 0.0000001f;
BleedingFactor = 0.38f;
}
protected ShadowMapFilter(ShadowMap shadowMap)
{
this.shadowMap = shadowMap;
}
public ShadowMapFilterDefault(ShadowMap shadowMap)
: base(shadowMap)
{
}