Re: [PyOpenGL-Users] glGetUniformLocation causes segmentation faults

[Mike C. F. <mcf...@vr...>]

Ian Mallett wrote:

> This might be a good time to bring up a long standing issue. 
> Personally, I'm getting null function errors--the only way I've gotten
> shaders to work is with ARB, and I'm not sure why. 
Missed this.

Can you give more details and/or a test-case?  When I run against
PyOpenGL trunk and enable INFO level logging in the extensions module I
get this:

INFO:OpenGL.extensions:OpenGL Version: 2.1.8575 FireGL
INFO:OpenGL.extensions:Chose alternate: glCreateProgram from
glCreateProgram, glCreateProgramObjectARB
INFO:OpenGL.extensions:Chose alternate: glCreateShader from
glCreateShader, glCreateShaderObjectARB
INFO:OpenGL.extensions:Chose alternate: glShaderSource from
glShaderSource, glShaderSourceARB
INFO:OpenGL.extensions:Chose alternate: glCompileShader from
glCompileShader, glCompileShaderARB
INFO:OpenGL.extensions:Chose alternate: glAttachShader from
glAttachShader, glAttachObjectARB
INFO:OpenGL.extensions:Chose alternate: glValidateProgram from
glValidateProgram, glValidateProgramARB
INFO:OpenGL.extensions:Chose alternate: glLinkProgram from
glLinkProgram, glLinkProgramARB
INFO:OpenGL.extensions:Chose alternate: glDeleteShader from
glDeleteShader, glDeleteObjectARB
INFO:OpenGL.extensions:Chose alternate: glGetAttribLocation from
glGetAttribLocation, glGetAttribLocationARB
INFO:OpenGL.extensions:GL Extension GL_ARB_occlusion_query available
INFO:OpenGL.extensions:GL Extension GL_ARB_point_parameters available
INFO:OpenGL.extensions:Chose alternate: glUseProgram from glUseProgram,
glUseProgramObjectARB
INFO:OpenGL.extensions:GL Extension GL_ARB_vertex_buffer_object available
INFO:OpenGL.extensions:Chose alternate: glVertexAttribPointer from
glVertexAttribPointer, glVertexAttribPointerARB

when running a shader-using sample.  That is, it appears to properly
choose the core rather than ARB extension versions (and the core
functions are non-null).

Good luck,
Mike

-- 
________________________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://www.vrplumber.com
  http://blog.vrplumber.com