D3DXCheckTextureRequirements

Checks texture-creation parameters.

HRESULT D3DXCheckTextureRequirements(
  LPDIRECT3DDEVICE9 pDevice,
  UINT * pWidth,
  UINT * pHeight,
  UINT * pNumMipLevels,
  DWORD Usage,
  D3DFORMAT * pFormat,
  D3DPOOL Pool
);

Parameters

pDevice

[in] Pointer to an IDirect3DDevice9 interface, representing the device to be associated with the texture.

pWidth

[in, out] Pointer to the requested width in pixels, or NULL. Returns the corrected size.

pHeight

[in, out] Pointer to the requested height in pixels, or NULL. Returns the corrected size.

pNumMipLevels

[in, out] Pointer to number of requested mipmap levels, or NULL. Returns the corrected number of mipmap levels.

Usage

[in] 0 or D3DUSAGE_RENDERTARGET. Setting this flag to D3DUSAGE_RENDERTARGET indicates that the surface is to be used as a render target. The resource can then be passed to the pNewRenderTarget parameter of the IDirect3DDevice9::SetRenderTarget method. If D3DUSAGE_RENDERTARGET is specified, the application should check that the device supports this operation by calling IDirect3D9::CheckDeviceFormat.

pFormat

[in, out] Pointer to a member of the D3DFORMAT enumerated type. Specifies the desired pixel format, or NULL. Returns the corrected format.

Pool

[in] Member of the D3DPOOL enumerated type, describing the memory class into which the texture should be placed.

Return Values

If the function succeeds, the return value is D3D_OK. If the function fails, the return value can be one of the following: D3DERR_INVALIDCALL.

Remarks

If parameters to this function are invalid, this function returns corrected parameters.

This function uses the following heuristics when comparing the requested requirements against available formats:

• Do not choose a format that has fewer channels.
• Avoid FOURCC And 24-bit formats unless explicitly requested.
• Try not to add new channels.
• Try not to change the number of bits per channel.
• Try to avoid converting between types of formats. For instance, avoid converting an ARGB format to a depth format.

Requirements

Header: Declared in D3dx9tex.h.