How store a screenshot into the texture?

Graphics and GPU Programming Programming

Started by michaelmk86 June 22, 2012 12:28 AM

7 comments, last by Aqua Costa 11 years, 9 months ago

189

Author

June 22, 2012 12:28 AM

hi,

I need to save the ShadowMap screen into a texture (IDirect3DBaseTexture9 or IDirect3DTexture9) like a screenshot, so I can use the data in this texture during my ShadowedScene.

what I have done so far is not working (I get an error: Unhandled exception at 0x67638d9e in Project.exe: 0xC0000005: Access violation reading location 0x00000080.)

IDirect3DBaseTexture9* ShadowMapTex; IDirect3DSurface9* RenderTarget; render("ShadowMap"); Device->GetRenderTarget(0, &RenderTarget); ShadowMapTex = (IDirect3DBaseTexture9*)RenderTarget; lightingFX.fx->SetTexture("xShadowMap", ShadowMapTex); Device->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_XRGB(0,0,0), 1.0f, 0L); render("ShadowedScene");
[/quote]

michaelmk86

189

Author

June 23, 2012 11:03 PM

Does anyone know how to get a screenshot on a texture?

Fredericvo

1,765

June 23, 2012 11:39 PM

A screenshot? Do you mean render to texture?

Aqua Costa

3,705

June 23, 2012 11:51 PM

I'm not really familiar with DirectX 9, but you have to create a ID3DXRenderToSurface* object using D3DXCreateRenderToSurface() function, then create a IDirect3DTexture9* and use



IDirect3DTexture9* pTexture;



//Create texture here





IDirect3DSurface9* pSurface;

pTexture->GetSurfaceLevel(0, &pSurface);

to get the surface.

To use the texture as a render target use the ID3DXRenderToSurface function BeginScene() and EndScene() function and pass the surface as an argument:



ID3DXRenderToSurface* pRenderToSurf;



//Create Render to Surface here



pRenderToSurf->BeginScene(pSurface, &viewPort);



//draw the scene





pRenderToSurf->EndScene(D3DX_FILTER_NONE);

21st Century Moose

13,459

June 24, 2012 12:19 AM

In general you won't take a screenshot and save it to a texture - that's going to involve a round-trip from the GPU to system memory and back and will be very very slow indeed. As advised, you need a proper render-to-texture setup instead.

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

michaelmk86

189

Author

June 24, 2012 12:23 AM

I'm not really familiar with DirectX 9, but you have to create a ID3DXRenderToSurface* object using D3DXCreateRenderToSurface() function, then create a IDirect3DTexture9* and use
IDirect3DTexture9* pTexture; //Create texture here IDirect3DSurface9* pSurface; pTexture->GetSurfaceLevel(0, &pSurface);
to get the surface.

To use the texture as a render target use the ID3DXRenderToSurface function BeginScene() and EndScene() function and pass the surface as an argument:
ID3DXRenderToSurface* pRenderToSurf; //Create Render to Surface here pRenderToSurf->BeginScene(pSurface, &viewPort); //draw the scene pRenderToSurf->EndScene(D3DX_FILTER_NONE);

I just need to get a screenshot and store it into a texture (IDirect3DTexture9*).

samething like that:
IDirect3DTexture9* myTexture;
myTexture = screenshot;

Aqua Costa

3,705

June 24, 2012 09:12 AM

I just need to get a screenshot and store it into a texture (IDirect3DTexture9*).

samething like that:
IDirect3DTexture9* myTexture;
myTexture = screenshot;

Whats the type of screenshot variable in your example?

michaelmk86

189

Author

June 24, 2012 10:40 AM

[quote name='michaelmk86' timestamp='1340497402' post='4952152']
I just need to get a screenshot and store it into a texture (IDirect3DTexture9*).

samething like that:
IDirect3DTexture9* myTexture;
myTexture = screenshot;

Aqua Costa

3,705

June 24, 2012 10:57 AM

[quote name='TiagoCosta' timestamp='1340529168' post='4952264']
[quote name='michaelmk86' timestamp='1340497402' post='4952152']
I just need to get a screenshot and store it into a texture (IDirect3DTexture9*).

samething like that:
IDirect3DTexture9* myTexture;
myTexture = screenshot;

Whats the type of screenshot variable in your example?
[/quote]
what do you mean type of screenshot?

IDirect3DTexture9* myTexture;
myTexture = GetScreenshot; (I mean get every pixel of the screen and store it into a texture)
[/quote]

Basically when you get a surface from a texture and use it in the SetRenderTarget() function (or as an argument of the ID3DXRenderToSurface->BeginScene() ) the draw calls will actually be drawn in the texture, so it's like a screenshot.

Check this article for more complete source code.

How store a screenshot into the texture?

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