private static bool IsShadowing(Camera shadowCamera, Surface surface)
{
return
surface.HasDrawProperties(DrawProperties.Shadowing) &&
(
surface.Boundless ||
shadowCamera.Contains(surface.BoundingBox) != ContainmentType.Disjoint
);
}
/// <summary>
/// Populate the shadowing parameters.
/// </summary>
/// <param name="surface">The shadow-casting surface.</param>
/// <param name="surfaceWorld">The shadow-casting surface's world transform.</param>
/// <param name="directionalLights">The directional lights affecting the surface.</param>
public void PopulateShadowing(Surface surface, ref Matrix surfaceWorld, List<DirectionalLight> directionalLights)
{
XiHelper.ArgumentNullCheck(surface, directionalLights);
// directional shadowing
for (int i = 0; i < Constants.DirectionalShadowCount; ++i)
{
if (i >= directionalLights.Count) directionalShadowEnableds[i] = false;
else
{
DirectionalLight light = directionalLights[i];
Texture2D shadowMap = light.VolatileShadowMap;
Camera shadowCamera = light.ShadowCamera;
Matrix shadowViewProjection;
shadowCamera.GetViewProjection(out shadowViewProjection);
Matrix shadowWorldViewProjection;
Matrix.Multiply(ref surfaceWorld, ref shadowViewProjection, out shadowWorldViewProjection);
directionalShadowEnableds[i] = light.Enabled && light.ShadowEnabled && shadowMap != null;
directionalShadowPositions[i] = shadowCamera.Position;
directionalShadowWorldViewProjections[i] = shadowWorldViewProjection;
if (shadowMap != null)
{
// only directional light 0 can have a shadow due to hardware limitations
if (i == 0) SetDirectionalShadow0(light.VolatileShadowMap);
}
}
}
DirectionalShadowDepthBias = Constants.DirectionalShadowDepthBias;
SetDirectionalShadowEnableds(directionalShadowEnableds);
SetDirectionalShadowPositions(directionalShadowPositions);
SetDirectionalShadowWorldViewProjections(directionalShadowWorldViewProjections);
}
/// <summary>
/// Populate the lighting parameters of a BasicEffect.
/// </summary>
/// <param name="effect">The effect.</param>
/// <param name="surface">The lit surface.</param>
/// <param name="ambientLights">The ambient lights affecting the lit material.</param>
/// <param name="directionalLights">The directional lights affecting the lit material.</param>
/// <param name="pointLights">The point lights affecting the lit material.</param>
public static void PopulateLighting(
this BasicEffect effect,
Surface surface,
List<AmbientLight> ambientLights,
List<DirectionalLight> directionalLights,
List<PointLight> pointLights)
{
XiHelper.ArgumentNullCheck(surface, ambientLights, directionalLights, pointLights, effect);
// lighting enabled
effect.LightingEnabled = surface.LightingEnabled;
// per-pixel lighting
effect.PreferPerPixelLighting = true; // MAGICVALUE
// material
effect.DiffuseColor = surface.DiffuseColor.ToVector3();
effect.SpecularColor = surface.SpecularColor.ToVector3();
effect.SpecularPower = surface.SpecularPower;
// ambient lighting
Vector3 ambientLightColor = Vector3.Zero;
foreach (AmbientLight ambientLight in ambientLights)
if (ambientLight.Enabled)
ambientLightColor += ambientLight.Color.ToVector3();
effect.AmbientLightColor = ambientLightColor;
// directional lights
for (int i = 0; i < Constants.DirectionalLightCount; ++i)
{
BasicDirectionalLight effectLight;
switch (i)
{
case 0: effectLight = effect.DirectionalLight0; break;
case 1: effectLight = effect.DirectionalLight1; break;
case 2: effectLight = effect.DirectionalLight2; break;
default: continue;
}
if (i >= directionalLights.Count) effectLight.Enabled = false;
else
{
DirectionalLight directionalLight = directionalLights[i];
effectLight.Enabled = directionalLight.Enabled;
effectLight.DiffuseColor = directionalLight.DiffuseColor.ToVector3();
effectLight.SpecularColor = directionalLight.SpecularColor.ToVector3();
effectLight.Direction = directionalLight.Direction;
}
}
// point lights emulated as directional lights
Vector3 surfaceCenter = surface.BoundingBox.GetCenter();
pointLights.DistanceSort(surfaceCenter, SpatialSortOrder.NearToFar);
for (int i = 0; i < Constants.PointLightCount; ++i)
{
BasicDirectionalLight effectLight;
switch (i + directionalLights.Count)
{
case 0: effectLight = effect.DirectionalLight0; break;
case 1: effectLight = effect.DirectionalLight1; break;
case 2: effectLight = effect.DirectionalLight2; break;
default: continue;
}
if (i >= pointLights.Count) effectLight.Enabled = false;
else
{
PointLight pointLight = pointLights[i];
effectLight.Enabled = pointLight.Enabled;
effectLight.DiffuseColor = pointLight.DiffuseColor.ToVector3();
effectLight.SpecularColor = pointLight.SpecularColor.ToVector3();
effectLight.Direction = Vector3.Normalize(surface.BoundingBox.GetCenter() - pointLight.Position);
}
}
}
/// <summary>
/// Populate the lighting parameters for normal drawing.
/// </summary>
/// <param name="surface">The lit surface.</param>
/// <param name="ambientLights">The ambient lights affecting the lit material.</param>
/// <param name="directionalLights">The directional lights affecting the lit material.</param>
/// <param name="pointLights">The point lights affecting the lit material.</param>
public void PopulateLighting(
Surface surface,
List<AmbientLight> ambientLights,
List<DirectionalLight> directionalLights,
List<PointLight> pointLights)
{
XiHelper.ArgumentNullCheck(surface, ambientLights, directionalLights, pointLights);
// lighting enabled
LightingEnabled = surface.LightingEnabled;
// material
DiffuseColor = surface.DiffuseColor.ToVector4();
SpecularColor = surface.SpecularColor.ToVector3();
SpecularPower = surface.SpecularPower;
// ambient lighting
bool ambientLightEnabled = false;
Vector3 ambientLightColor = Vector3.Zero;
foreach (AmbientLight ambientLight in ambientLights)
{
if (ambientLight.Enabled)
{
ambientLightColor += ambientLight.Color.ToVector3();
ambientLightEnabled = true;
}
}
this.AmbientLightEnabled = ambientLightEnabled;
this.AmbientLightColor = ambientLightColor;
// directional lights
for (int i = 0; i < Constants.DirectionalLightCount; ++i)
{
if (i >= directionalLights.Count) directionalLightEnableds[i] = false;
else
{
DirectionalLight directionalLight = directionalLights[i];
directionalLightDirections[i] = directionalLight.Direction;
directionalLightEnableds[i] = directionalLight.Enabled;
directionalLightDiffuseColors[i] = directionalLight.DiffuseColor.ToVector3();
directionalLightSpecularColors[i] = directionalLight.SpecularColor.ToVector3();
}
}
SetDirectionalLightEnableds(directionalLightEnableds);
SetDirectionalLightDirections(directionalLightDirections);
SetDirectionalLightDiffuseColors(directionalLightDiffuseColors);
SetDirectionalLightSpecularColors(directionalLightSpecularColors);
// point lights
Vector3 surfaceCenter = surface.BoundingBox.GetCenter();
pointLights.DistanceSort(surfaceCenter, SpatialSortOrder.NearToFar);
for (int i = 0; i < Constants.PointLightCount; ++i)
{
if (i >= pointLights.Count) pointLightEnableds[i] = false;
else
{
PointLight pointLight = pointLights[i];
pointLightPositions[i] = pointLight.Position;
pointLightEnableds[i] = pointLight.Enabled;
pointLightDiffuseColors[i] = pointLight.DiffuseColor.ToVector3();
pointLightSpecularColors[i] = pointLight.SpecularColor.ToVector3();
pointLightRanges[i] = pointLight.Range;
pointLightFalloffs[i] = pointLight.Falloff;
}
}
SetPointLightEnableds(pointLightEnableds);
SetPointLightPositions(pointLightPositions);
SetPointLightDiffuseColors(pointLightDiffuseColors);
SetPointLightSpecularColors(pointLightSpecularColors);
SetPointLightRanges(pointLightRanges);
SetPointLightFalloffs(pointLightFalloffs);
}
