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Type: Posts; User: qnext

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  1. Replies
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    Fast GL_RGB upload to Texture : TBO ?

    Hi,

    I needs to have the fastest RGB 24 bits data streaming to texture (movie). It seems that PBO with RGB24 is slow, however my data are 24 bits .. I don't wants to use CPU to translate from RGB24...
  2. GL_ARB_buffer_storage equivalent of AMD Pinned memory ?

    HI,

    I am trying to optimize video upload in my application. Is GL_ARB_buffer_storage the general extension that I can use instead of AMD Pinned Memory to avoid copy from CPU to GPU?
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    If I understand correctly : texelFetch bypass...

    If I understand correctly : texelFetch bypass any filtering,works in non normalized texture coordinate ? In this case, I need to render a quad aligned without bilinear filtering ?
    In this case I...
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    1,482

    perfect screen quad aligned and GL_NEAREST

    Hi,

    I am trying to improve my yuv->rgb convert .. Now I only draw quad (scaled, rotate, ..) in my scene with a texture with GL_NEAREST, GL_CLAMP_TO_EDGE and a shader that do yuv->rgb and the...
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    thanks for all your answers ... I have tried to...

    thanks for all your answers ... I have tried to have an fbo with float16 ... but I have always theses stranges colors ....
    A-Do I need to have a 30 bits display screen to have true color or can I...
  6. Replies
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    10 bits dpx texture

    Hi,

    I need to display 10 bits texture coming from 10 Bits dpx file.

    1)- I have a firepro, so I can enable 10 bits opengl output (that's what I wants to do add the end). For now I have...
  7. Replies
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    1,614

    I have test this and it's not working ... same...

    I have test this and it's not working ... same artifact and more ... And I don't understand why I need shift from -0.5
  8. the biggest problem is that I imagine you use...

    the biggest problem is that I imagine you use GL_LUMINANCE to transfert each single channel ... and it seems that this format is not supported without swizlling by the driver to rgba ... I have the...
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    intel map texture extension

    Is there any sample to explain how to use the new opengl intel extension ?: http://www.opengl.org/registry/specs/INTEL/map_texture.txt
  10. Replies
    3
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    1,614

    glsl bilinear and artifact on same scale

    I need to implement a glsl bilinear filter (I can't use GL_LINEAR because i am doing YUY2 ->RGB convert, so I have set this to GL_NEAREST). I have a classic bilinear filtering like this :


    void...
  11. Replies
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    regardings double ... i was talking about double...

    regardings double ... i was talking about double pbo (not double format)...
    I am certain that GL_BGRA is accelerated on nvidia and amd card, but I am not sure that GL_Luminance is as fast as GL_BGRA...
  12. Replies
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    GL_LUMINANCE and pbo : slow !

    I am trying to play a movie in yuv 420 ... so I have Three texture (one for lumi, one for u, one for V) with only one channel. When I use pbo it seems that it's slower than playing the same yuv files...
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    pbo update : refresh rate non constant

    Hi,

    I use windows Seven, nvidia card, double buffering, vsync on
    I wants to use pbo to improve movie update to texture (large movie 5760x1080 resolution!) ... I am near ok with standard...
  14. Thread: Bezier patch

    by qnext
    Replies
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    552

    Bezier patch

    Hi,

    I need to have a m x n bezier patch. I am using Qt3d to draw bezier patch but the bezier patch are not joined : I am trying to find how to calculate the control point to have smooth joined...
  15. extract translation/ euler rotation from modelview

    Hi,

    I need for an augmented reality application convert the finded opengl modelview (I have a find a way to have a modelview ... but it's not exact ... so to understand I hopes to recover the...
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    Re: Pan tilt Camera and augmented reality

    some news ... I have done some modification using now Quaternion to set pan and tilt, and it works if I find the calibratedModelView when camera is horizontal (no tilt in calibration Model View). in...
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    Re: Pan tilt Camera and augmented reality

    Thanks for your answer ... I will check this but my problem for now is that it don't works even if tilt is set to Zero (no influence) when I move only the pan axis ?? and if move in the same way only...
  18. Replies
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    2,981

    Pan tilt Camera and augmented reality

    Hi,

    I am doing an augmented reality application : I have a known real 3D object ... a camera mount on an high end Pan tilt unit (very precise) is watching the 3D Object, I need to add augmented...
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