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Odd-Sized Textures

Started by yzzid Feb 18, 2003 at 8:05 AM 9 replies 1.3k views

Original Post

Feb 18, 2003 at 8:05 AM

It appears that textures in D3D have to be sized by powers of 2. However, in OpenGL I am able to make non-power of 2 sized textures using gluBuild2DMipmaps. Is there a way to do this in D3D? Currently this is how I am doing it, and it isn't working.

  
D3DXCreateTexture(m_pDevice, width, height, 0, 0, D3DFMT_A8R8G8B8, D3DPOOL_MANAGED, &m_pTextures[i]);

D3DLOCKED_RECT d3dlr;
m_pTextures[i]->LockRect(0, &d3dlr, NULL, 0);
memcpy(d3dlr.pBits, pData, 4 * width * height);
m_pTextures[i]->UnlockRect(0);

-dizzy [edited by - yzzid on February 18, 2003 9:06:25 AM]

shmaLbus

Feb 18, 2003 at 8:50 AM

d3d can make arbitrary sizes too. i''m failing to see the problem here. it''s created ok right? no errors? if you go like this after you create the texture..

  
IDirect3DSurface8 *tex_surface=NULL;
D3DSURFACE_DESC surDesc;

// m_pTexture = texture you just created

m_pTexture->GetSurfaceLevel(0,&tex_surface);
tex_surface->GetDesc(&surDesc);

// and look at surDesc.Width and Height members.

// if they''re the height and width you specified

// then it must be something with your memcpy.

yzzid

Author

yzzid

Feb 18, 2003 at 9:17 AM

I tried and D3D is changing the sizes to powers of 2!

For example I have a texture that is 128 x 160 and when I get the description D3D gives back 128 x 256. So it is creating a texture by increasing the value to the next power of two greater than the given size.

Not sure of a way around this.

-dizzy

Pipo DeClown

156

Pipo DeClown

Feb 18, 2003 at 9:29 AM

    
D3DXCreateTexture(m_pDevice, width, height, D3DX_FILTER_NONE, D3DX_FILTER_NONE, D3DFMT_A8R8G8B8, D3DPOOL_MANAGED, &m_pTextures[i]);

D3DX_FILTER_NONE

[edit] [ code ] tags dont work for {i}?

.lick

[edited by - Pipo DeClown on February 18, 2003 10:30:47 AM]

[edited by - Pipo DeClown on February 18, 2003 10:31:55 AM]

yzzid

Author

yzzid

Feb 18, 2003 at 9:38 AM

D3DXCreateTexture is failing when I do that.
Odd.

-dizzy

yzzid

Author

yzzid

Feb 18, 2003 at 9:46 AM

OK I found the answer. I will post it here so everyone (who cares) will know.

1. D3DXCreateTexture()
2. D3DXLoadSurfaceFromMemory()
3. D3DXFilterTexture()

D3DXLoadSurfaceFromMemory() is the trick

Using these three calls is the key.
Hope this helps other people out!!

-dizzy

Pipo DeClown

156

Pipo DeClown

Feb 18, 2003 at 10:30 AM

D3DX_FILTER_NONE?

.lick

yzzid

Author

yzzid

Feb 18, 2003 at 12:32 PM

Didn''t work Pipo. When I used D3DX_FILTER_NONE it still changed the size to a power of 2.

-dizzy

bmoberly

Feb 18, 2003 at 1:04 PM

Hi - D3D_FILTER_NONE will not prevent directx from resizing your textures to a size of power 2, but it will prevent direct3d from scaling the contents of your original image to fill the new, and presumably larger, texture surface. The original image will stay the same size in the new texture and the parts of the new texture it does not fill will be black.

You can then adjust your texture coordinates, etc... to reference only the part of the texture you need.

I''ll have to try the createtexture, loadtexturefromemory, filtertexture method - it looks interesting.

BM

yzzid

Author

yzzid

Feb 18, 2003 at 2:52 PM

I am sorry I should elaborate on my findings.

When calling D3DXLoadSurfaceFromMemory() you must use a filter parameter of D3DX_FILTER_LINEAR or the texture will be copied as is and all area that is expanded will be filled with black as bmoberly stated. Then you must call D3DXFilterTexture to get the other mip map levels filled. If you do not call D3DXFilterTexture your mipmaps will all be black.
Hope this helps someone.

-dizzy

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