PRB: Texture Transparency in Direct3D Immediate Mode (159648)
The information in this article applies to:
- Microsoft Windows 2000 Server
- Microsoft Windows 2000 Advanced Server
- Microsoft Windows 2000 Professional
- Microsoft DirectX Software Development Kit 3.0
This article was previously published under Q159648 SYMPTOMS
One method for achieving transparency in textures for use in Direct3D
Immediate Mode is to use DirectDraw's support for color keys. When calling
IDirectDrawSurface2::SetColorKey() on a texture surface to specify a
transparent color, the texture does not exhibit any transparent pixels.
CAUSE
The default values of the internal-state variables in the rendering engine
for the rendering module are not set to enable alpha blending so the
texture is drawn completely with no transparency.
RESOLUTION
Enable alpha blending by setting the D3DRENDERSTATE_BLENDENABLE render
state to TRUE.
STATUS
This behavior is by design.
MORE INFORMATION
The D3DOP_STATERENDER opcode for the Direct3D execute buffer sets the value
of internal-state variables in the rendering engine for the
rendering module. The D3DRENDERSTATE_BLENDENABLE D3DRENDERSTATETYPE for
this opcode should be set to TRUE to enable alpha blending. The default
value is FALSE. Setting this value to TRUE will enable texture
transparency.
REFERENCES
For more information about DirectX and Direct3D, see the DirectX topic
in the Platform SDK. This is available on MSDN and online at
| Modification Type: | Minor | Last Reviewed: | 3/7/2005 |
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| Keywords: | kbprb KB159648 |
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