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D3DBLEND enumeration

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

Header

D3D9Types.h

 

 

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