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XDL

XGraphicsglBlendFunc Method

The glBlendFunc function specifies pixel arithmetic.

Namespace:  Pixoneer.NXDL.NGR
Assembly:  NXDLgr (in NXDLgr.dll) Version: 1.2.817.72
Syntax
C#
Copy
public void glBlendFunc(
	int sfactor,
	int dfactor
)

Parameters

sfactor
Type: SystemInt32
Specifies how the red, green, blue, and alpha source-blending factors are computed. Nine symbolic constants are accepted: GL_ZERO, GL_ONE, GL_DST_COLOR, GL_ONE_MINUS_DST_COLOR, GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_DST_ALPHA, GL_ONE_MINUS_DST_ALPHA, and GL_SRC_ALPHA_SATURATE.
dfactor
Type: SystemInt32
Specifies how the red, green, blue, and alpha destination-blending factors are computed. Eight symbolic constants are accepted: GL_ZERO, GL_ONE, GL_SRC_COLOR, GL_ONE_MINUS_SRC_COLOR, GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_DST_ALPHA, and GL_ONE_MINUS_DST_ALPHA.

Return Value

Type: 
This function does not return a value.
Remarks
In RGB mode, pixels can be drawn using a function that blends the incoming (source) RGBA values with the RGBA values that are already in the framebuffer (the destination values). By default, blending is disabled. Use glEnable and glDisable with the GL_BLEND argument to enable and disable blending. When enabled, glBlendFunc defines the operation of blending. The sfactor parameter specifies which of nine methods is used to scale the source color components. The dfactor parameter specifies which of eight methods is used to scale the destination color components. The eleven possible methods are described in the following table. Each method defines four scale factors―one each for red, green, blue, and alpha.
See Also