SourceBlend Property
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RenderState.SourceBlend Property

Gets or sets the color blending factor. This factor represents a value by which to multiply the source pixel color before adding it to the destination pixel to produce a color that is a blend of the two. The default is Blend.One.

Namespace: Microsoft.Xna.Framework.Graphics
Assembly: Microsoft.Xna.Framework (in microsoft.xna.framework.dll)

public Blend SourceBlend { get; set; }

Property Value

A Blend factor to set or get for the source pixel.

The alpha value of a color controls its transparency. Enabling alpha blending with AlphaBlendEnable allows colors, materials, and textures on a surface to be blended with transparency onto another surface.

Alpha blending is determined by the SourceBlend and DestinationBlend properties. With the default BlendFunction, the source pixel times the SourceBlend is added to the destination pixel (the pixel on the back buffer) times the DestinationBlend to produce a color that is a blend of the two pixel colors. The BlendFunction determines the operation used on the outcome of the source blend and destination blend components.

The following short code snippet sets the render state to use additive alpha blending prior to a draw call.

graphics.GraphicsDevice.RenderState.AlphaBlendEnable = true;
graphics.GraphicsDevice.RenderState.SourceBlend = Blend.One;
graphics.GraphicsDevice.RenderState.DestinationBlend = Blend.One;
graphics.GraphicsDevice.RenderState.BlendFunction = BlendFunction.Add;

// TODO: Place the drawing calls that should be alpha blended here.

Xbox 360, Windows XP SP2, Windows Vista

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