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D3DBLEND enumeration

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Defines the supported blend mode.

Syntax

typedef enum D3DBLEND { 
  D3DBLEND_ZERO             = 1,
  D3DBLEND_ONE              = 2,
  D3DBLEND_SRCCOLOR         = 3,
  D3DBLEND_INVSRCCOLOR      = 4,
  D3DBLEND_SRCALPHA         = 5,
  D3DBLEND_INVSRCALPHA      = 6,
  D3DBLEND_DESTALPHA        = 7,
  D3DBLEND_INVDESTALPHA     = 8,
  D3DBLEND_DESTCOLOR        = 9,
  D3DBLEND_INVDESTCOLOR     = 10,
  D3DBLEND_SRCALPHASAT      = 11,
  D3DBLEND_BOTHSRCALPHA     = 12,
  D3DBLEND_BOTHINVSRCALPHA  = 13,
  D3DBLEND_BLENDFACTOR      = 14,
  D3DBLEND_INVBLENDFACTOR   = 15,
  D3DBLEND_SRCCOLOR2        = 16,
  D3DBLEND_INVSRCCOLOR2     = 17,
  D3DBLEND_FORCE_DWORD      = 0x7fffffff
} D3DBLEND, *LPD3DBLEND;

Constants

D3DBLEND_ZERO

Blend factor is (0, 0, 0, 0).

D3DBLEND_ONE

Blend factor is (1, 1, 1, 1).

D3DBLEND_SRCCOLOR

Blend factor is (Rₛ, Gₛ, Bₛ, Aₛ).

D3DBLEND_INVSRCCOLOR

Blend factor is (1 - Rₛ, 1 - Gₛ, 1 - Bₛ, 1 - Aₛ).

D3DBLEND_SRCALPHA

Blend factor is (Aₛ, Aₛ, Aₛ, Aₛ).

D3DBLEND_INVSRCALPHA

Blend factor is ( 1 - Aₛ, 1 - Aₛ, 1 - Aₛ, 1 - Aₛ).

D3DBLEND_DESTALPHA

Blend factor is (Ad Ad Ad Ad).

D3DBLEND_INVDESTALPHA

Blend factor is (1 - Ad 1 - Ad 1 - Ad 1 - Ad).

D3DBLEND_DESTCOLOR

Blend factor is (Rd, Gd, Bd, Ad).

D3DBLEND_INVDESTCOLOR

Blend factor is (1 - Rd, 1 - Gd, 1 - Bd, 1 - Ad).

D3DBLEND_SRCALPHASAT

Blend factor is (f, f, f, 1); where f = min(Aₛ, 1 - Ad).

D3DBLEND_BOTHSRCALPHA

Obsolete. Starting with DirectX 6, you can achieve the same effect by setting the source and destination blend factors to D3DBLEND_SRCALPHA and D3DBLEND_INVSRCALPHA in separate calls.

D3DBLEND_BOTHINVSRCALPHA

Obsolete. Source blend factor is (1 - Aₛ, 1 - Aₛ, 1 - Aₛ, 1 - Aₛ), and destination blend factor is (Aₛ, Aₛ, Aₛ, Aₛ); the destination blend selection is overridden. This blend mode is supported only for the D3DRS_SRCBLEND render state.

D3DBLEND_BLENDFACTOR

Constant color blending factor used by the frame-buffer blender. This blend mode is supported only if D3DPBLENDCAPS_BLENDFACTOR is set in the SrcBlendCaps or DestBlendCaps members of D3DCAPS9.

D3DBLEND_INVBLENDFACTOR

Inverted constant color-blending factor used by the frame-buffer blender. This blend mode is supported only if the D3DPBLENDCAPS_BLENDFACTOR bit is set in the SrcBlendCaps or DestBlendCaps members of D3DCAPS9.

D3DBLEND_SRCCOLOR2

Blend factor is (PSOutColor[1]r, PSOutColor[1]g, PSOutColor[1]b, not used). See Render Target Blending.

Differences between Direct3D 9 and Direct3D 9Ex:

  • This flag is available in Direct3D 9Ex only.

 

D3DBLEND_INVSRCCOLOR2

Blend factor is (1 - PSOutColor[1]r, 1 - PSOutColor[1]g, 1 - PSOutColor[1]b, not used)). See Render Target Blending.

Differences between Direct3D 9 and Direct3D 9Ex:

  • This flag is available in Direct3D 9Ex only.

 

D3DBLEND_FORCE_DWORD

Forces this enumeration to compile to 32 bits in size. Without this value, some compilers would allow this enumeration to compile to a size other than 32 bits. This value is not used.

Remarks

In the preceding member descriptions, the RGBA values of the source and destination are indicated by the s and d subscripts.

The values in this enumerated type are used by the following render states:

  • D3DRS_DESTBLEND
  • D3DRS_SRCBLEND
  • D3DRS_DESTBLENDALPHA
  • D3DRS_SRCBLENDALPHA

See D3DRENDERSTATETYPE

Render Target Blending

Direct3D 9Ex has improved text rendering capabilities. Rendering clear-type fonts would normally require two passes. To eliminate the second pass, a pixel shader can be used to output two colors, which we can call PSOutColor[0] and PSOutColor[1]. The first color would contain the standard 3 color components (RGB). The second color would contain 3 alpha components (one for each component of the first color).

These new blending modes are only used for text rendering on the first render target.

Requirements

Requirement Value
Header
D3D9Types.h

See also

Direct3D Enumerations