creating mip maps with rendertargets
Author
Hi,
I've tried creating mipmaps (by using autogen and by specifying the number of levels) with rendertargets but when I call getLevelCount() it always returns 1. I've read that it is possible to do this but it doesn't work on either my 9600Pro or my 6600GT.
Can anyone give me a code snippet or information on how to set this up?
Thanks
hi flip_mo_kid,
could you please paste your code so we can have a look at it?
Code snippit from the SDK Docs:
// This code example assumes that m_d3dDevice is a
// valid pointer to a IDirect3DDevice9 interface
IDirect3DTexture9 * pMipMap;
m_pD3DDevice->CreateTexture(256, 256, 5, 0, D3DFMT_R8G8B8,
D3DPOOL_MANAGED, &pMipMap);
could you please paste your code so we can have a look at it?
Code snippit from the SDK Docs:
// This code example assumes that m_d3dDevice is a
// valid pointer to a IDirect3DDevice9 interface
IDirect3DTexture9 * pMipMap;
m_pD3DDevice->CreateTexture(256, 256, 5, 0, D3DFMT_R8G8B8,
D3DPOOL_MANAGED, &pMipMap);
I work within my engine with Textures as RenderTargets.
Following code for creating the Texture delivers also correct
Mipmap count with <GetLevelCount>.
unsigned nMipLevels = 2;// sTextureTree.nMipLevels;
HRESULT hr = m_pDeviceD3D->CreateTexture( nWidth, nHeight, nMipLevels, D3DUSAGE_RENDERTARGET, dwFormatD3D, D3DPOOL_DEFAULT, &pTextureD3D, NULL );
Wilfried
Following code for creating the Texture delivers also correct
Mipmap count with <GetLevelCount>.
unsigned nMipLevels = 2;// sTextureTree.nMipLevels;
HRESULT hr = m_pDeviceD3D->CreateTexture( nWidth, nHeight, nMipLevels, D3DUSAGE_RENDERTARGET, dwFormatD3D, D3DPOOL_DEFAULT, &pTextureD3D, NULL );
Wilfried
sorry it seems to me,that my post haven't been sent,
now it appears more than enough ;-)
Wilfried
now it appears more than enough ;-)
Wilfried
You need to set D3DUSAGE_AUTOGENMIPMAP in addition to D3DUSAGE_RENDERTARGET if you want automatic mipmapping.
Author
EDIT:: Actually,
works.. I was writing to the wrong main file (I had two open in my project as I was copying code from one to the other) WHOOPS!!
However, I am trying to copy out the pixel colour in the smallest mipmap and I have written this:
and it is failing. Does anyone know if this should work?
Thanks again!
[Edited by - flip_mo_kid on May 29, 2005 12:13:06 PM]
hr = D3DXCreateTexture( Device, Pixels, Pixels, 0, D3DUSAGE_AUTOGENMIPMAP & D3DUSAGE_RENDERTARGET, D3DFMT_A8R8G8B8, D3DPOOL_DEFAULT, &dynamicTexture);works.. I was writing to the wrong main file (I had two open in my project as I was copying code from one to the other) WHOOPS!!
However, I am trying to copy out the pixel colour in the smallest mipmap and I have written this:
HRESULT hr;LPDIRECT3DSURFACE9 surface;LPDIRECT3DSURFACE9 tempSurface;hr = dynamicTexture->GetSurfaceLevel(dynamicTexture->GetLevelCount()-1, &surface);if( FAILED(hr) ){ // does something }D3DSURFACE_DESC desc;surface->GetDesc(&desc);Device->CreateOffscreenPlainSurface(desc.Width, desc.Height, desc.Format, D3DPOOL_SYSTEMMEM, &tempSurface, NULL);hr = Device->GetRenderTargetData(surface, tempSurface);and it is failing. Does anyone know if this should work?
Thanks again!
[Edited by - flip_mo_kid on May 29, 2005 12:13:06 PM]
I would think this line from the SDK docs (Automatic Generation of Mipmaps) would answer that question:
Only the top texture level is accessible to the application; the texture sublevels are not accessible since they will be created only when needed by the driver.
Only the top texture level is accessible to the application; the texture sublevels are not accessible since they will be created only when needed by the driver.
Quote:Original post by flip_mo_kid
D3DUSAGE_AUTOGENMIPMAP & D3DUSAGE_RENDERTARGET,
When combining multiple flags use the bitwsie or '|' operator not the bitwise and '&' perhaps counterinitutive, but that is the way that it is.
Quote:Original post by turnpastQuote:Original post by flip_mo_kid
D3DUSAGE_AUTOGENMIPMAP & D3DUSAGE_RENDERTARGET,
When combining multiple flags use the bitwsie or '|' operator not the bitwise and '&' perhaps counterinitutive, but that is the way that it is.
I did that first actually and the level count was still 1! When I changed to the & (the first time I've ever done this to cover all bases) it worked. Rather odd really.
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