DDSCAPS2
The DDSCAPS2 structure defines the capabilities of a DirectDrawSurface object. This structure is part of the DDSURFACEDESC2 structure.
typedef struct _DDSCAPS2 {
DWORD dwCaps;
DWORD dwCaps2;
DWORD dwCaps3;
DWORD dwCaps4;
} DDSCAPS2, FAR* LPDDSCAPS2;
Members
- dwCaps
- One or more of the following flag values representing the capabilities of the surface. (The flags in this member are identical to those in the corresponding member of the DDSCAPS structure.)
- DDSCAPS_3D
- Unsupported. Use the DDSCAPS_3DDEVICE instead.
- DDSCAPS_3DDEVICE
- This surface can be used for 3-D rendering. Applications can use this flag to ensure that a device that can render only to a certain heap has allocated from the correct heap. If this flag is set for a heap, the surface is not allocated from that heap.
- DDSCAPS_ALLOCONLOAD
- Not used.
- DDSCAPS_ALPHA
- This surface contains alpha-only information.
- DDSCAPS_BACKBUFFER
- This surface is the of a surface flipping structure. Typically, this capability is set by the CreateSurface method when the DDSCAPS_FLIP flag is used. Only the surface that immediately precedes the DDSCAPS_FRONTBUFFER surface has this capability set. The other surfaces are identified as back buffers by the presence of the DDSCAPS_FLIP flag, their attachment order, and the absence of DDSCAPS_FRONTBUFFER and DDSCAPS_BACKBUFFER capabilities. If this capability is sent to the CreateSurface method, a stand-alone back buffer is being created. After this method is called, this surface could be attached to a , another back buffer, or both to form a structure. For more information, see IDirectDrawSurface7::AddAttachedSurface. DirectDraw supports any number of surfaces in a flipping structure.
- DDSCAPS_COMPLEX
- A is being described. A complex surface results in the creation of more than one surface. The additional surfaces are attached to the root surface. The complex surface can be destroyed only by destroying the root.
- DDSCAPS_FLIP
- This surface is a part of a surface-flipping structure. When this capability is passed to the CreateSurface method, a front buffer and one or more are created. DirectDraw sets the DDSCAPS_FRONTBUFFER bit on the front-buffer surface and the DDSCAPS_BACKBUFFER bit on the surface adjacent to the front-buffer surface. The dwBackBufferCount member of the DDSURFACEDESC structure must be set to at least 1 for the method call to succeed. The DDSCAPS_COMPLEX capability must always be set when creating multiple surfaces by using the CreateSurface method.
- DDSCAPS_FRONTBUFFER
- This surface is the front buffer of a surface-flipping structure. This flag is typically set by the CreateSurface method when the DDSCAPS_FLIP capability is set. If this capability is sent to the CreateSurface method, a stand-alone front buffer is created. This surface does not have the DDSCAPS_FLIP capability. It can be attached to back buffers to form a flipping structure by using IDirectDrawSurface7::AddAttachedSurface.
- DDSCAPS_HWCODEC
- This surface can have a stream decompressed to it by the hardware.
- DDSCAPS_LIVEVIDEO
- This surface can receive live video.
- DDSCAPS_LOCALVIDMEM
- This surface exists in true, local video memory, rather than nonlocal video memory. If this flag is specified, DDSCAPS_VIDEOMEMORY must be specified, as well. This flag cannot be used with the DDSCAPS_NONLOCALVIDMEM flag.
- DDSCAPS_MIPMAP
- This surface is one level of a . This surface is attached to other DDSCAPS_MIPMAP surfaces to form the mipmap. This can be done explicitly by creating a number of surfaces and attaching them by using the IDirectDrawSurface7::AddAttachedSurface method, or implicitly by the CreateSurface method. If this capability is set, DDSCAPS_TEXTURE must also be set.
- DDSCAPS_MODEX
- This surface is a 320×200 or 320×240 surface.
- DDSCAPS_NONLOCALVIDMEM
- This surface exists in nonlocal video memory, rather than true, local video memory. If this flag is specified, DDSCAPS_VIDEOMEMORY flag must be specified, as well. This cannot be used with the DDSCAPS_LOCALVIDMEM flag.
- DDSCAPS_OFFSCREENPLAIN
- This surface is any that is not an overlay, texture, z-buffer, front-buffer, back-buffer, or alpha surface. It is used to identify plain surfaces.
- DDSCAPS_OPTIMIZED
- Not currently implemented.
- DDSCAPS_OVERLAY
- This surface is an overlay. It might or might not be directly visible, depending on whether it is currently being overlaid onto the . DDSCAPS_VISIBLE can be used to determine if it is currently being overlaid.
- DDSCAPS_OWNDC
- This surface has a device context (DC) association for a long period of time.
- DDSCAPS_PALETTE
- This device driver allows unique DirectDrawPalette objects to be created and attached to this surface.
- DDSCAPS_PRIMARYSURFACE
- The surface is the primary surface. It represents what is currently visible.
- DDSCAPS_STANDARDVGAMODE
- This surface is a standard VGA mode surface, and not a Mode X surface. This flag cannot be used in combination with the DDSCAPS_MODEX flag.
- DDSCAPS_SYSTEMMEMORY
- This surface memory was allocated in system memory.
- DDSCAPS_TEXTURE
- This surface can be used as a 3-D texture. It does not indicate whether the surface is currently being used for that purpose.
- DDSCAPS_VIDEOMEMORY
- This surface exists in display memory.
- DDSCAPS_VIDEOPORT
- This surface can receive data from a video port.
- DDSCAPS_VISIBLE
- Changes made to this surface are immediately visible. It is always set for the , as well as for overlays while they are being overlaid and texture maps while they are being textured.
- DDSCAPS_WRITEONLY
- Only write access is permitted to the surface. Read access from the surface can cause a general protection (GP) fault, and the read results from this surface would not be meaningful.
- DDSCAPS_ZBUFFER
- This surface is the z-buffer. The z-buffer contains information that cannot be displayed. Instead, it contains bit-depth information that is used to determine which pixels are visible and which are obscured.
- dwCaps2
- Additional surface capabilities. This member can contain one or more of the following capability flags, or when using this structure with the IDirectDrawSurface7::SetSurfaceDesc method, this member can contain an additional flag to indicate how the surface memory was allocated:
- Capability flags
- DDSCAPS2_CUBEMAP
- New for DirectX 7.0. This surface is a cubic environment map. When using this flag, also specify which face or faces of the cubic environment map to create.
- DDSCAPS2_CUBEMAP_POSITIVEX
- New for DirectX 7.0. This flag is used with the DDSCAPS2_CUBEMAP flag to create the positive X face of a cubic environment map.
- DDSCAPS2_CUBEMAP_NEGATIVEX
- New for DirectX 7.0. This flag is used with the DDSCAPS2_CUBEMAP flag to create the negative X face of a cubic environment map.
- DDSCAPS2_CUBEMAP_POSITIVEY
- New for DirectX 7.0. This flag is used with the DDSCAPS2_CUBEMAP flag to create the positive Y face of a cubic environment map.
- DDSCAPS2_CUBEMAP_NEGATIVEY
- New for DirectX 7.0. This flag is used with the DDSCAPS2_CUBEMAP flag to create the negative Y face of a cubic environment map.
- DDSCAPS2_CUBEMAP_POSITIVEZ
- New for DirectX 7.0. This flag is used with the DDSCAPS2_CUBEMAP flag to create the positive Z face of a cubic environment map.
- DDSCAPS2_CUBEMAP_NEGATIVEZ
- New for DirectX 7.0. This flag is used with the DDSCAPS2_CUBEMAP flag to create the negative Z face of a cubic environment map.
- DDSCAPS2_CUBEMAP_ALLFACES
- New for DirectX 7.0. This flag is used with the DDSCAPS2_CUBEMAP flag to create all six faces of a cubic environment map.
- DDSCAPS2_D3DTEXTUREMANAGE
- New for DirectX 7.0. The texture is always managed by Direct3D.
- DDSCAPS2_DONOTPERSIST
- New for DirectX 7.0. The managed surface can be safely lost.
- DDSCAPS2_HARDWAREDEINTERLACE
- This surface receives data from a video port, using the de-interlacing hardware. This allows the driver to allocate memory for any extra buffers that might be required. The DDSCAPS_VIDEOPORT and DDSCAPS_OVERLAY flags must also be set.
- DDSCAPS2_HINTANTIALIASING
- The application intends to use antialiasing. Only valid if DDSCAPS_3DDEVICE is also set. For more information, see Antialiasing.
- DDSCAPS2_HINTDYNAMIC
- Indicates to the driver that this surface is locked very frequently (for procedural textures, dynamic light maps, and so on). This flag can only be used for texture surfaces (DDSCAPS_TEXTURE flag set in the dwCaps member). This flag cannot be used with the DDSCAPS2_HINTSTATIC or DDSCAPS2_OPAQUE flags.
- DDSCAPS2_HINTSTATIC
- Indicates to the driver that this surface can be reordered or retiled on load. This operation does not change the size of the texture. It is relatively fast and symmetrical, since the application can lock these bits (although it degrades performance when doing so). This flag can only be used for texture surfaces (DDSCAPS_TEXTURE flag set in the dwCaps member). This flag cannot be used with the DDSCAPS2_HINTDYNAMIC or DDSCAPS2_OPAQUE flags.
- DDSCAPS2_MIPMAPSUBLEVEL
- New for DirectX 7.0. It enables easier use of GetAttachedSurface, rather than EnumAttachedSurfaces, for surface constructs such as cube maps, in which there is more than one mipmap surface attached to the root surface. This should be set on all non-top-level surfaces in a mipmapped cube map so that a call to GetAttachedSurface can distinguish between top-level faces and attached mipmap levels. This capability bit is ignored by CreateSurface.
- DDSCAPS2_OPAQUE
- Indicates to the driver that this surface will never be locked again. The driver is free to optimize this surface by retiling and compression. Such a surface cannot be locked or used in blit operations; attempts to lock or blit a surface with this capability fail. This flag can only be used for texture surfaces (DDSCAPS_TEXTURE flag set in the dwCaps member). This flag cannot be used with the DDSCAPS2_HINTDYNAMIC or DDSCAPS2_HINTSTATIC flags.
- DDSCAPS2_STEREOSURFACELEFT
- New for DirectX 7.0. This surface is part of a stereo flipping chain. When this flag is set during a IDirectDraw7::CreateSurface call, a pair of stereo surfaces are created for each buffer in the primary flipping chain. You must create a complex flipping chain (with back buffers). You cannot create a single set of stereo surfaces. The IDirectDrawSurface7::Flip method requires back buffers, so at least 4 surfaces must be created.
In addition, when this flag is set in a DDSURFACEDESC structure as the result of an IDirectDraw7::EnumDisplayModes or IDirectDraw7::GetDisplayMode call, it indicates support for stereo in that mode.
- DDSCAPS2_TEXTUREMANAGE
- The client would like this texture surface to be managed by the driver if the driver is capable; otherwise, it is managed by Direct3D Immediate Mode (new in DirectX 7.0). This flag can be used only for texture surfaces (DDSCAPS_TEXTURE flag set in the dwCaps member). For more information, see Automatic Texture Management in the Direct3D Immediate Mode documentation. Do not use this flag if your application uses Direct3D Retained Mode. Instead, create textures in system memory, and allow Retained Mode to manage them.
- dwCaps3 and dwCaps4
- Not currently used.
Windows NT/2000: Requires Windows 2000.
Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
Header: Declared in ddraw.h.