protected override void OnUpdate(RenderContext context)
{
var effectBinding = context.MaterialBinding;
if (effectBinding == null)
{
throw new EffectBindingException("MaterialBinding not set in render context.");
}
// Get ambient light and number of directional lights.
Vector3 ambientLight = Vector3.Zero;
int numberOfDirectionalLights = 0;
if (context.Scene != null && context.SceneNode != null)
{
// Note: XNA stock effect lights are always global.
var query = context.Scene.Query <GlobalLightQuery>(context.CameraNode, context);
if (query.AmbientLights.Count > 0)
{
var light = (AmbientLight)query.AmbientLights[0].Light;
ambientLight = (Vector3)light.Color * light.Intensity;
}
numberOfDirectionalLights = query.DirectionalLights.Count;
}
// ----- Special: We have to add the ambient light to the emissive color.
var diffuseBinding = effectBinding.ParameterBindings["DiffuseColor"]
?? effectBinding.EffectEx.ParameterBindings["DiffuseColor"];
var emissiveBinding = effectBinding.ParameterBindings["EmissiveColor"]
?? effectBinding.EffectEx.ParameterBindings["EmissiveColor"];
Vector4 diffuse = BasicEffectTechniqueBinding.GetColor4(diffuseBinding);
Vector3 emissive = BasicEffectTechniqueBinding.GetColor3(emissiveBinding);
// Premultiply emissive and add ambient lighting. (Diffuse is already premultiplied.)
float alpha = diffuse.W;
_effectiveEmissive.X = emissive.X * alpha + ambientLight.X * diffuse.X;
_effectiveEmissive.Y = emissive.Y * alpha + ambientLight.Y * diffuse.Y;
_effectiveEmissive.Z = emissive.Z * alpha + ambientLight.Z * diffuse.Z;
// ----- Select shader.
int shaderIndex = 0;
bool fresnelEnabled = true;
bool specularEnabled = true;
// Check value of "FresnelFactor" parameter binding.
var fresnelBinding = effectBinding.ParameterBindings["FresnelFactor"] as EffectParameterBinding <float>;
if (fresnelBinding != null)
{
fresnelEnabled = (fresnelBinding.Value != 0);
}
var specularBinding = effectBinding.ParameterBindings["EnvironmentMapSpecular"] as EffectParameterBinding <Vector3>;
if (specularBinding != null)
{
specularEnabled = (specularBinding.Value != Vector3.Zero);
}
if (!((IStockEffectBinding)effectBinding).FogEnabled)
{
shaderIndex += 1;
}
if (fresnelEnabled)
{
shaderIndex += 2;
}
if (specularEnabled)
{
shaderIndex += 4;
}
if (numberOfDirectionalLights <= 1) // Optimized path if there are no more than one directional lights.
{
shaderIndex += 8;
}
Id = (byte)shaderIndex;
}
protected override void OnUpdate(RenderContext context)
{
var effectBinding = context.MaterialBinding as SkinnedEffectBinding;
if (effectBinding == null)
{
throw new EffectBindingException("SkinnedEffectBinding not found in render context.");
}
// Get ambient light and number of directional lights.
Vector3 ambientLight = Vector3.Zero;
int numberOfDirectionalLights = 0;
if (context.Scene != null && context.SceneNode != null)
{
// Note: XNA stock effect lights are always global.
var query = context.Scene.Query <GlobalLightQuery>(context.CameraNode, context);
if (query.AmbientLights.Count > 0)
{
var light = (AmbientLight)query.AmbientLights[0].Light;
ambientLight = (Vector3)light.Color * light.Intensity;
}
numberOfDirectionalLights = query.DirectionalLights.Count;
}
// ----- Special: We have to add the ambient light to the emissive color.
var diffuseBinding = effectBinding.ParameterBindings["DiffuseColor"]
?? effectBinding.EffectEx.ParameterBindings["DiffuseColor"];
var emissiveBinding = effectBinding.ParameterBindings["EmissiveColor"]
?? effectBinding.EffectEx.ParameterBindings["EmissiveColor"];
Vector4 diffuse = BasicEffectTechniqueBinding.GetColor4(diffuseBinding);
Vector3 emissive = BasicEffectTechniqueBinding.GetColor3(emissiveBinding);
// Premultiply emissive and add ambient lighting. (Diffuse is already premultiplied.)
float alpha = diffuse.W;
_effectiveEmissive.X = emissive.X * alpha + ambientLight.X * diffuse.X;
_effectiveEmissive.Y = emissive.Y * alpha + ambientLight.Y * diffuse.Y;
_effectiveEmissive.Z = emissive.Z * alpha + ambientLight.Z * diffuse.Z;
// ----- Select shader.
int shaderIndex = 0;
if (!((IStockEffectBinding)effectBinding).FogEnabled)
{
shaderIndex += 1;
}
if (effectBinding.WeightsPerVertex == 2)
{
shaderIndex += 2;
}
else if (effectBinding.WeightsPerVertex == 4)
{
shaderIndex += 4;
}
if (effectBinding.PreferPerPixelLighting)
{
shaderIndex += 12;
}
else if (numberOfDirectionalLights <= 1) // Optimized path if there are no more than one directional lights.
{
shaderIndex += 6;
}
Id = (byte)shaderIndex;
}
