DirectX problems with more than one +4096 textures?

[vilgeits]

I'm working on a composition system that needs to work on large images.

Mostly are under that 4096 but some times supersampling is needed so if you want to use a 3000 px image you are really using a 6000px one. I noticed that I need to disable mip generation to avoid to go over 8192, and it is loaded without problems.

My real problem is that loading more than one texture of this sizes the app crashes with any useful information in the log file

Code: Select all

Ogre::TexturePtr mTptr =Ogre::TextureManager::getSingleton().load(s[0],Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME,Ogre::TEX_TYPE_2D,0);
Ogre::LogManager::getSingletonPtr()->logMessage("FIRST LOADING");
while (!mTptr->isLoaded()){}
Ogre::LogManager::getSingletonPtr()->logMessage("FIRST LOADED");

mTptr =Ogre::TextureManager::getSingleton().load(s[1],Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME,Ogre::TEX_TYPE_2D,0);
Ogre::LogManager::getSingletonPtr()->logMessage("SECOND LOADING");
while (!mTptr->isLoaded()){}
Ogre::LogManager::getSingletonPtr()->logMessage("SECOND LOADED");

The trace writes "FIRST LOADING" & "FIRST LOADED" but nothing about the second, also I swap s[0] and s[1] it works fine for the first or if I load two times the same tex (s[0] or s[1]) it runs the app.

More info:
SO: Win 7 64 bit
GPU: 8800 GT
OGRE v. 1.8
System: Directx + fixed pipeline (PS3.0).

Thanks in advance!

[Kojack]

A 6000x6000 image will most likely be padded up to 8192x8192 (padding is different on different chipsets, I had a texture 320 wide, an ati card padded it to 384 and a nvidia card padded it to 512).
8192x8192 (assuming 32 bit colour) takes 256MB of ram.
The standard memory size of a geforce 8800gt is 512MB. Once you've got various buffers on there (back, depth, vertex, index, etc) you've got room for only 1 of those big textures.

Even a 4096x4096 texture is going to take up 64MB, so only 7 of them could fit in video memory.

[vilgeits]

A 6000x6000 image will most likely be padded up to 8192x8192 (padding is different on different chipsets, I had a texture 320 wide, an ati card padded it to 384 and a nvidia card padded it to 512).
8192x8192 (assuming 32 bit colour) takes 256MB of ram.
The standard memory size of a geforce 8800gt is 512MB. Once you've got various buffers on there (back, depth, vertex, index, etc) you've got room for only 1 of those big textures.

Even a 4096x4096 texture is going to take up 64MB, so only 7 of them could fit in video memory.

The weird thing is that no error is shown (with other test a "not enough memory" has been shown).

PS. I forget to say that the same crash happens under a 9600GT (1Gb)

[vilgeits]

14:20:26: Texture: TEXFIRST.exr: Loading 1 faces(PF_FLOAT32_RGB,6000x3000x1) with 0 generated mipmaps from Image. Internal format is PF_FLOAT32_RGBA,6000x3000x1.
14:20:27: FIRST LOADING
14:20:27: FIRST LOADED
14:20:30: Texture: TEXSECOND.exr: Loading 1 faces(PF_FLOAT32_RGB,6000x3000x1) with 0 generated mipmaps from Image. Internal format is PF_FLOAT32_RGBA,6000x3000x1.

And crashes without more logging or message.

No memory error here.

[vilgeits]

If I try to load .jpg's instead .exr (8bit instead 32bit) it works fine but I repeat is not a memory issue, also it crashes at same point if I use 16 bit per channel.

[Kojack]

Wait, you were loading floating point textures? Multiply all my memory usages by 4.
A 4096x4096 now takes 256MB.

[mkultra333]

Shader model 3.0 requires cards support 4096x4096 textures, but I don't know that every card will support higher than that if they don't need to.

Regarding memory, if you can dxt3 the texture then it'll only be about 1/6th the memory footprint (1/8th if you get rid of the mipmaps).