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Type: Posts; User: ToolTech

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  1. Re: extract translation/ euler rotation from modelview

    You can read about SVD Singular Value Decompositions to get grip on more advanced methods to decompose a matrix.
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    Re: texture compression

    My guess is that it actually is a driver bug as I have seen this on several other platforms when it ocmes to nvidia latest drivers..
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    Re: What is the fast GL flavor?

    I think that if you are an OpenGL beginner on OSX, you should try out Cocoa or Java as these are beeing promoted more or less by Apple in favour of the other variants.

    My guess is that they all...
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    Re: NV Driver BUG DXT5 ?

    Can anybody else confirm this bug ?
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    Re: NV Driver BUG DXT5 ?

    Here is a link to some screenshots

    http://www.gizmosdk.se/dxt5_bugg.pdf

    and more info on

    http://www.gizmosdk.se/dxt5_bugg_2.pdf
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    Re: NV Driver BUG DXT5 ?

    I have used the same code snippet in Gizmo3D for ages. Now the image gets somehow miplevel dependant flipped horizontaly.

    Another API (OSG) also shows strange result.

    ---

    Another API (NVSG)...
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    Re: NV Driver BUG DXT5 ?

    The problem is originated to using texture compression so when i use the compressed format to send to opengl, the image gets corrupted.

    Are you sure you use dxt5 all the way down to hw and not...
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    NV Driver BUG DXT5 ?

    Has anybody seen a bug in dxt5 compressed images in driver 169.21 ? dxt1 and dxt3 seems to be fine bug dxt5 get mixed up horizontaly depending on mip level.
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    Re: AUTO Generated 3D Texture MipMaps ?

    Ok. It was my mistake. The data I send actually gave those peculiar patterns when resampled using a cubic spline in software as well. So the result was as supposed (but I didn't understood that first...
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    AUTO Generated 3D Texture MipMaps ?

    Hi !

    I get strange interleaved stripes when using 3D textures in combination with auto generated mipmaps. Bug or Feature ?
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    glsl/leopard freeze hw

    Hi !

    I am having a fragment shader that locks the HW. No application can respond etc. In bootcamp everything works fine but when I have run the shader and reboots, the OSX will not start up ? I...
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    Re: Geometry Shaders...

    Havn't tried that as I am a bit scared of mixin my production OSX hw with tests like that.

    Ok. Will try that on a test HW to see if it works. Thanx..
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    Geometry Shaders...

    Are available on my OSX drivers but not in BootCamp drivers :-( Any news about updates for BootCamp etc ?
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    Geometry Shaders

    Hi !

    How close do you guys think this is to geometry shaders ?

    http://www.wipo.int/pctdb/en/wo.jsp?wo=2005122095

    Don't know if this has any kind of implications on geometry shader stuff in...
  15. Re: ATI glCompressedTexImage2DARB crash with PBO bound

    Same thing happends to me with BootCamp 1.4 Beta drivers for OSX
  16. Thread: PPO

    by ToolTech
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    Re: PPO

    You should take a look at the performance sample of PBOs at nvidias homepage. I have the same situation where i upload video in real time to textures but I have found out that its very HW dependant...
  17. Re: About the VIEWPORT matrix, how does it works?

    Do you have a valid context ?

    Do you get any errors glGetError();

    Pretty Basic question or ... ?
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    Re: PBO perf problem

    Ok. Here are some results...

    On My 7800 i get tremendous PBO accel on BGRA,FP16 formats but not that much on RGB or RGBA 8 (about the same as for glTex)

    On my 6800 i get good accel on BGRA,FP16...
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    Re: PBO perf problem

    I don't use any LUT in that sense. I ment that I needed a lookup table or dictionary whether to use PBOs or not depending on hardware, texture format and driver version. I upload raw data.
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    Re: NPOT Performance drop

    Great !!!!

    Thanx a lot !
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    NPOT Performance drop

    On my ATI HW 1300 (OSX) I get a huge perf drop on NPOT textures when using VBOs and heavy geometry.

    Shall the asumption be that using NPOT should give no or littel perf drop in normal cases ?
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    Re: PBO perf problem

    I agree with yooyo. I do the same thing for effect in my scene graph using video, and i can see a tremendous gain on most HW BUT in some cases i get worse performance and it is this that annoys me...
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    Re: PBO perf problem

    Do you need to set up a "feature" matrix for each vendor and driver version to use PBO or do you need to run benchmarks on each tested HW ?

    I downloaded a sample from nvidias website that renders...
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    PBO perf problem

    Hi !

    I am using PBOs to upload textures.

    On NVidia HW i get lower performance with PBOs that using old fasioned upload ??

    How come ? What kind of strategy shall you use when using PBOs. Do...
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    Re: PBO performance

    Hi !

    I am a bit worried about PBOs. On Ati HW on OSX i get tremendous performance. it runs so much faster using PBOs.

    On Win32 NVidia drivers 81.xx i get really crappy performance. On 91.31 i...
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