protected override void OnBeginApply(DrawingContext context, Material previousMaterial)
{
var previousAlphaTestMaterial = previousMaterial as AlphaTestMaterial;
if (previousAlphaTestMaterial == null)
{
effect.View = context.View;
effect.Projection = context.Projection;
MaterialHelper.ApplyFog(context as DrawingContext3D, effect);
}
if (alpha != Constants.Alpha)
{
effect.Alpha = alpha;
}
if (diffuseColor.HasValue)
{
effect.DiffuseColor = diffuseColor.Value;
}
if (referenceAlpha.HasValue)
{
effect.ReferenceAlpha = referenceAlpha.Value;
}
if (alphaFunction.HasValue)
{
effect.AlphaFunction = alphaFunction.Value;
}
if (previousAlphaTestMaterial == null || previousTexture != texture)
{
previousTexture = effect.Texture = texture;
}
effect.World = world;
effect.VertexColorEnabled = VertexColorEnabled;
if (SamplerState != null)
{
GraphicsDevice.SamplerStates[0] = SamplerState;
}
effect.CurrentTechnique.Passes[0].Apply();
}
protected override void OnBeginApply(DrawingContext context, Material previousMaterial)
{
// Check if the previous material used is a also a BasicMaterial. If so, we can
// guarantee that the current shader has all the correct global parameters, and
// there's no need to set them again.
var previousBasicMaterial = previousMaterial as BasicMaterial;
if (previousBasicMaterial == null || previousBasicMaterial.lightingEnabled != lightingEnabled)
{
// Update parameters that are global and shared between different instances.
// This includes view projection matrices and global directional lights.
effect.View = context.View;
effect.Projection = context.Projection;
var context3D = context as DrawingContext3D;
if (lightingEnabled)
{
MaterialHelper.ApplyLights(context3D, effect);
}
MaterialHelper.ApplyFog(context3D, effect);
}
// Update per instance shader parameters only when the value does not equal to
// the default one. Remember to reset it back to defaults during EndApply.
// Since most objects will have their materials left at the default state,
// most of these parameter won't be updated to the shader.
if (alpha != Constants.Alpha)
{
effect.Alpha = alpha;
}
if (diffuseColor.HasValue)
{
effect.DiffuseColor = diffuseColor.Value;
}
if (emissiveColor.HasValue)
{
effect.EmissiveColor = emissiveColor.Value;
}
if (specularColor.HasValue)
{
effect.SpecularColor = specularColor.Value;
}
if (specularPower.HasValue)
{
effect.SpecularPower = specularPower.Value;
}
// Setting the texture parameter has a small overhead, so compare it upfront.
if (previousBasicMaterial == null || texture != previousTexture)
{
previousTexture = effect.Texture = texture;
}
// Update shader parameters that are always different for each instance.
effect.World = world;
// Update shader parameters that has little or no overhead.
effect.TextureEnabled = texture != null;
effect.LightingEnabled = lightingEnabled;
effect.PreferPerPixelLighting = preferPerPixelLighting;
effect.VertexColorEnabled = vertexColorEnabled;
// Finally apply the shader.
pass.Apply();
// Update sampler state
if (samplerState != null)
{
context.graphics.SamplerStates[0] = samplerState;
}
}
