How can I use HWA in an extension?

[Phi]

Hey devvers,
I have an extension that displays on Fusion's window. It outputs a bitmap, or cSurface * aka LPSURFACE.
What are the steps I need to take in order to get it to use HWA?

Cheers

[ricko_max]

Phi, I don't know if I'm using actually HWA surfaces, but when compiling with HWA target on EDIF SDK, I get a performance boost and all my shaders work. So I suppose it's using HWA at all.

[Phi]

Thanks ricko. In my case I'm manually messing with graphics, so it's more complicated.
Extract from email from Yves:

You can create 2 types of HWA surfaces from an extension:

• ST_HWA_RTTEXTURE
  What is it : Render target texture in HWA mode.
  What you can do : blit other surfaces into it, blit to screen.
  What you can't do : GetDC, LockBuffer, GetPixel/SetPixel, etc.
  When to use it : when you have an intermediate surface that you blit other surfaces into before you render it to the screen.
  Note: Creating a render target takes time, so cache it if possible.
  
• ST_HWA_ROMTEXTURE
  What is it : HWA texture created in video memory, managed. Managed means that the texture is restored when the device is lost.
  What you can do : blit to screen only
  What you can't do : GetDC, LockBuffer, GetPixel/SetPixel, blit to non surfaces that aren't render target or HWA screen, etc...
  When to use it : when you have a cached fixed image that you want to blit to screen.

For example:

    LPSURFACE ps = WinGetSurface((int)rhPtr->rhIdEditWin);
    BOOL bHWA = ((rhPtr->rh4.rh4Mv->mvAppMode & SM_D3D) != 0);
    LPSURFACE pProto = ps;
    if ( bHWA )
        GetSurfacePrototype(&pProto, ps->GetDepth(), ST_HWA_RTTEXTURE, ps->GetDriver());
    LPSURFACE randomSurface = new cSurface();
    randomSurface->Create(rdPtr->rHo.hoImgWidth, rdPtr->rHo.hoImgHeight, pProto);

HWA surfaces are more limited than normal surfaces.