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michaelmk86

How store a screenshot into the texture?

8 posts in this topic

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.)
[quote]
[code]

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");

[/code]
[/quote]
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I'm not really familiar with DirectX 9, but you have to create a [i]ID3DXRenderToSurface* [/i]object using [i]D3DXCreateRenderToSurface()[/i] function, then create a [i]IDirect3DTexture9*[/i] and use
[CODE]
IDirect3DTexture9* pTexture;

//Create texture here


IDirect3DSurface9* pSurface;
pTexture->GetSurfaceLevel(0, &pSurface);
[/CODE]
to get the surface.

To use the texture as a render target use the [i]ID3DXRenderToSurface [/i]function [i]BeginScene()[/i] and [i]EndScene()[/i] function and pass the surface as an argument:
[CODE]
ID3DXRenderToSurface* pRenderToSurf;

//Create Render to Surface here

pRenderToSurf->BeginScene(pSurface, &viewPort);

//draw the scene


pRenderToSurf->EndScene(D3DX_FILTER_NONE);

[/CODE] Edited by TiagoCosta
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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.
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[quote name='TiagoCosta' timestamp='1340495466' post='4952144']
I'm not really familiar with DirectX 9, but you have to create a [i]ID3DXRenderToSurface* [/i]object using [i]D3DXCreateRenderToSurface()[/i] function, then create a [i]IDirect3DTexture9*[/i] and use
[CODE]
IDirect3DTexture9* pTexture;

//Create texture here


IDirect3DSurface9* pSurface;
pTexture->GetSurfaceLevel(0, &pSurface);
[/CODE]
to get the surface.

To use the texture as a render target use the [i]ID3DXRenderToSurface [/i]function [i]BeginScene()[/i] and [i]EndScene()[/i] function and pass the surface as an argument:
[CODE]
ID3DXRenderToSurface* pRenderToSurf;

//Create Render to Surface here

pRenderToSurf->BeginScene(pSurface, &viewPort);

//draw the scene


pRenderToSurf->EndScene(D3DX_FILTER_NONE);

[/CODE]
[/quote]
[quote name='TiagoCosta' timestamp='1340495466' post='4952144']
I'm not really familiar with DirectX 9, but you have to create a [i]ID3DXRenderToSurface* [/i]object using [i]D3DXCreateRenderToSurface()[/i] function, then create a [i]IDirect3DTexture9*[/i] and use
[CODE]
IDirect3DTexture9* pTexture;

//Create texture here


IDirect3DSurface9* pSurface;
pTexture->GetSurfaceLevel(0, &pSurface);
[/CODE]
to get the surface.

To use the texture as a render target use the [i]ID3DXRenderToSurface [/i]function [i]BeginScene()[/i] and [i]EndScene()[/i] function and pass the surface as an argument:
[CODE]
ID3DXRenderToSurface* pRenderToSurf;

//Create Render to Surface here

pRenderToSurf->BeginScene(pSurface, &viewPort);

//draw the scene


pRenderToSurf->EndScene(D3DX_FILTER_NONE);

[/CODE]
[/quote]

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

samething like that:
IDirect3DTexture9* myTexture;
myTexture = screenshot;
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[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;
[/quote]

Whats the type of [i]screenshot[/i] variable in your example?
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[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;
[/quote]

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

IDirect3DTexture9* myTexture;
myTexture = GetScreenshot; (I mean get every pixel of the [i]screen and [/i]store it into a texture)
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[quote name='michaelmk86' timestamp='1340534420' post='4952276']
[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;
[/quote]

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

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

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

Check [url="http://www.two-kings.de/tutorials/dxgraphics/dxgraphics16.html"]this article[/url] for more complete source code. Edited by TiagoCosta
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