IND_BlendingType
[Types]

Defines
#define	IND_ZERO   500
	Blend factor (0, 0, 0, 0).
#define	IND_ONE   501
	Blend factor (1, 1, 1, 1).
#define	IND_SRCCOLOR   502
	Blend factor (Rs,Gs,Bs,As).
#define	IND_INVSRCCOLOR   503
	Blend factor (1 - Rs, 1 - Gs, 1 - Bs, 1 - As).
#define	IND_SRCALPHA   504
	Blend factor (As, As, As, As).
#define	IND_INVSRCALPHA   505
	Blend factor ( 1 - As, 1 - As, 1 - As, 1 - As).
#define	IND_DESTALPHA   506
	Blend factor (Ad, Ad, Ad, Ad).
#define	IND_INVDESTALPHA   507
	Blend factor (1 - Ad, 1 - Ad, 1 - Ad, 1 - Ad).
#define	IND_DESTCOLOR   508
	Blend factor (Rd, Gd, Bd, Ad).
#define	IND_INVDESTCOLOR   509
	Blend factor (1 - Rd, 1 - Gd, 1 - Bd, 1 - Ad).
#define	IND_SRCALPHASAT   510
	Blend factor (f, f, f, 1); f = min(A, 1 - Ad).
#define	IND_BOTHSRCALPHA   511
	Obsoleto.
#define	IND_BOTHINVSRCALPHA   512
	Blend factor (1 - As, 1 - As, 1 - As, 1 - As), y el destino (As, As, As, As);.
#define	IND_BLENDFACTOR   513
	Blend colour.
#define	IND_INVBLENDFACTOR   514
	Blend opposite colour.
Typedefs
typedef int	IND_BlendingType
	Blending type.

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Typedef Documentation

typedef int IND_BlendingType

Blending type.

Type IND_BlendigType define the type of blend (to do alphablending). Alphablending is a powerful tool that can be used to create lots of graphical efects ( burst, electricity, speck efects, rain, etc).

The more usual factors of blending are:

• (source, destination) = (IND_SRCALPHA, IND_INVSRCALPHA) => This is the usual method of blending to draw picture with alpha channel. It regards the alpha channel to draw pictures that have variable transparency.
• (source, destination) = (IND_SRCALPHA, IND_ONE) => It is used to speck effects. In the source picture it has black areas than later will be transparent in the screen.

You can try diferents values to the source and to the destination and you can get a big mount of diverse efects as much aditive as subtracttive (relative to RGBA values) and a great visual impact.

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