Visualization, TKOpenGl - texture initialization fails on Intel HD 4600 in ray tracing test

The error message appears on the following system, but Ray-Tracing still works (on second frame):

  GLvendor    = 'Intel'
  GLdevice    = 'Intel(R) HD Graphics 2500'
  GLversion   = '4.0.0 - Build 10.18.10.3621'
  GLSLversion = '4.00 - Build 10.18.10.3621'

The minimum reproducing test case is to display point sprite in the scene:

pload MODELING VISUALIZATION
vvbo 0
vinit View1
box b 1 2 3
vsetdispmode 1
vdisplay b
vfit
vraytrace 1

vpoint p 0 0 0

On tested system GL_INVALID_OPERATION error appears within first call to glDrawArrays() of method OpenGl_Workspace::RunRaytraceShaders():

  myGlContext->core15fwd->glDrawArrays (GL_TRIANGLES, 0, 6);

However error is inadequate - the reasons listed in OpenGL documentation for GL_INVALID_OPERATION are not met in our case.

Empirically error message does not appear if GL_ARB_sampler_objects functionality is not used, or when sampler is set to Mipmap-based format (not GL_NEAREST or GL_LINEAR used for Mipmap-less textures) before rendering Ray-Tracing code (I suppose when FBO texture is drawn), e.g. add following line to OpenGl_Workspace::DisableTexture():

aSampler->SetParameter (*myGlContext, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_LINEAR);

Dear Andrey,
could you please check if you have the same issue on your system. Comment out the line "if (theContext.core33 == NULL)" in the OpenGl_Sampler.cxx and try test case:

Standard_Boolean OpenGl_Sampler::Init (OpenGl_Context& theContext)
{
  if (theContext.core33 == NULL)
  {

Hello Kirill,

1. Your "minimum reproducing test case" is working: after command "vpoint p 0 0 0" the box disappears

2. Commenting out line 71 in OpenGl_Sampler.cxx resolves the problem

3. I do not see anything like aSampler variable in OpenGl_Workspace::DisableTexture(), thus could not try using SetParameter()...

Branch [archived branch] has been created by Commenter 3.

[revision removed]


Detailed log of new commits:

Author: Commenter 3
Date: Thu Jan 29 15:07:23 2015 +0300

    0025758: Visualization, TKOpenGl - texture initialization fails on Intel HD 4600 in ray tracing test
    
    Unbind global texture sampler right after its usage.

Branch [archived branch] has been updated forcibly by Commenter 3.

[revision removed]

Please test the patch in branch CR25758.

I confirm that the original problem is fixed and I see no regressions on my machine

Branch [archived branch] has been updated forcibly by Participant.

[revision removed]

Branch [archived branch] has been rebased on the current master

Dear Commenter 1,

Branch CR25758 from occt git-repository (and master from products git-repository) was compiled on Linux, MacOS and Windows platforms and tested.
[revision removed]

Number of compiler warnings:
occt component:
   Linux: 18 (18 on master)
   Windows: 0 (0 on master)
products component :
   Linux: 11 (11 on master)
   Windows: 1 (1 on master)

Regressions/Differences:
Not detected

Testing cases:
v3d raytrace(014) bug24819 - OK
http://occt-tests/CR25758-master-occt/Debian60-64/v3d/raytrace/bug24819.html
http://occt-tests/CR25758-master-occt/Windows-32-VC10/v3d/raytrace/bug24819.html

Testing on Linux:
Total MEMORY difference: 369519092 / 370076844
Total CPU difference: 54480.249999999985 / 49863.81000000002

Testing on Windows:
Total MEMORY difference: 275765020 / 276276616
Total CPU difference: 36784.890625 / 36894.0

Branch [archived branch] has been deleted by Commenter 3.

[revision removed]