Surface correct POOL ?

Graphics and GPU Programming Programming

Started by ArgusMaker July 12, 2011 02:24 PM

6 comments, last by ArgusMaker 12 years, 9 months ago

102

Author

July 12, 2011 02:24 PM

[s]Hi!
My latest problem concerns rendering surfaces to the backbuffer.
I wrote a very simple code, but when i present my backbuffer nothing appears.
What's wrong?



IDirect3DSurface9* surface = NULL;

IDirect3DSurface9* backbuffer = NULL;

POINT point;

DX::g_pd3dDevice->GetBackBuffer(0,0,D3DBACKBUFFER_TYPE_MONO,&backbuffer);

DX::g_pd3dDevice->CreateOffscreenPlainSurface(100,100,D3DFMT_A8R8G8B8,D3DPOOL_SYSTEMMEM,&surface,NULL);

DX::g_pd3dDevice->SetRenderTarget(0,surface);

DX::g_pd3dDevice->Clear(0,NULL,D3DCLEAR_TARGET,D3DCOLOR_XRGB(255,255,255),0,0);

DX::g_pd3dDevice->SetRenderTarget(0,DX::BackBuffer);



point.x = 10;

point.y = 10;

DX::g_pd3dDevice->UpdateSurface(surface,NULL,backbuffer,&point);

[/s]
edit: problem solved! xD
edit2: a new problem appears! XD
I need a surface where i can draw, but i also need to be able to render that surface to the screen.
If a surface is created in D3DPOOL_SYSTEMMEM it can be rendered to the screen, but you can't draw on it.
On the other hand D3DPOOL_DEFAULT allows you to draw on the surface but disables the capability to render the surface to the screen...
How should i create the surface? Thanks in advance

ArgusMaker

102

Author

July 12, 2011 05:16 PM

Hi!
My latest problem concerns rendering surfaces to the backbuffer.
I wrote a very simple code, but when i present my backbuffer nothing appears.
What's wrong?

IDirect3DSurface9* surface = NULL; IDirect3DSurface9* backbuffer = NULL; POINT point; DX::g_pd3dDevice->GetBackBuffer(0,0,D3DBACKBUFFER_TYPE_MONO,&backbuffer); DX::g_pd3dDevice->CreateOffscreenPlainSurface(100,100,D3DFMT_A8R8G8B8,D3DPOOL_SYSTEMMEM,&surface,NULL); DX::g_pd3dDevice->SetRenderTarget(0,surface); DX::g_pd3dDevice->Clear(0,NULL,D3DCLEAR_TARGET,D3DCOLOR_XRGB(255,255,255),0,0); DX::g_pd3dDevice->SetRenderTarget(0,DX::BackBuffer); point.x = 10; point.y = 10; DX::g_pd3dDevice->UpdateSurface(surface,NULL,backbuffer,&point);

edit: problem solved! xD

MJP

20,295

July 12, 2011 05:49 PM

On the other hand D3DPOOL_DEFAULT allows you to draw on the surface but disables the capability to render the surface to the screen...

Sure it does. You just can't use it with UpdateSurface, which is not a rendering function (it's a function for updating the contents of a normal GPU texture with the contents of a CPU-acccesible texture). The normal way to create a render target texture is to create a texture with CreateTexture, specifying D3DPOOL_DEFAULT and D3DUSAGE_RENDERTARGET.

Then you can render it to the backbuffer by...

1. Drawing a quad covering the entire screen with your render target set as the texture
2. Using ID3DXSprite to draw the texture as a screen-sized sprite
3. Using StretchRect to copy it to the backbuffer

The Blog | The Book

ArgusMaker

102

Author

July 12, 2011 09:29 PM

Ok, thanks, stretchrect works.
I can't use textures due to their size limitations (power of 2). One last thing:
Why this code doesen't fill my surface in red?



	IDirect3DSurface9* surface = NULL;

	DX::g_pd3dDevice->CreateOffscreenPlainSurface(w,h,D3DFMT_X8R8G8B8,D3DPOOL_DEFAULT,&surface,NULL);

	IDirect3DSurface9* old_rt;

	DX::g_pd3dDevice->GetRenderTarget(0,&old_rt);

	DX::g_pd3dDevice->SetRenderTarget(0,surface);

	DX::g_pd3dDevice->Clear(0,NULL,D3DCLEAR_TARGET,D3DCOLOR_XRGB(255,0,0),0,0);

	DX::g_pd3dDevice->SetRenderTarget(0,old_rt);

21st Century Moose

13,459

July 12, 2011 10:04 PM

Power of 2 restrictions may not apply to rendertargets (I've found a few drivers where - even if they apply to normal textures - you can create a rendertarget texture at the same size as your display) and in any event your hardware may very well support non-power-of-2 anyway (any reasonably modern hardware - less than 5 or so years old - should).

Direct3D has need of instancing, but we do not. We have plenty of glVertexAttrib calls.

ArgusMaker

102

Author

July 13, 2011 08:39 AM

[font="Segoe UI"][color="#2a2a2a"]So how do you explain the memory access error for the second line?
[/font]

IDirect3DTexture9* texture;

DX::g_pd3dDevice->CreateTexture(w,h,0,D3DUSAGE_RENDERTARGET,D3DFMT_X8R8G8B8,D3DPOOL_DEFAULT,&texture,NULL);

21st Century Moose

13,459

July 13, 2011 04:53 PM

You're not initializing your variables:

IDirect3DTexture9 *texture = NULL;

Also be sure to check the HRESULT and if you're still getting failures use the debug runtimes to get additional error info.

Direct3D has need of instancing, but we do not. We have plenty of glVertexAttrib calls.

Evil Steve

2,021

July 14, 2011 10:07 AM

[font="Segoe UI"][color="#2a2a2a"]So how do you explain the memory access error for the second line?
[/font] IDirect3DTexture9* texture; DX::g_pd3dDevice->CreateTexture(w,h,0,D3DUSAGE_RENDERTARGET,D3DFMT_X8R8G8B8,D3DPOOL_DEFAULT,&texture,NULL);

More than likely g_pd3dDevice is null or an invalid (uninitialised) pointer.