[PyOpenGL-Users] Possible issue with glGetQueryiv wrapper?

[Ed P. <edp...@gm...>]

Has anyone come across this before?

Found in 3.0.2 win32

In the following code sequence:

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    glEnable(GL_RASTERIZER_DISCARD)
    glBindTransformFeedback(GL_TRANSFORM_FEEDBACK,TxFB_Buffers)
    glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER,0,TxFB_Buffers)
    glBeginTransformFeedback(GL_TRIANGLES)
    glBeginQuery(GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN,TxFB_Query)
    glDrawElementsui(GL_TRIANGLES,IdxArray)
    glEndTransformFeedback()
    glEndQuery(GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN)
    glGetQueryiv(GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN,GL_CURRENT_QUERY,TxFB_count)
    glDisable(GL_RASTERIZER_DISCARD)
    glBindTransformFeedback(GL_TRANSFORM_FEEDBACK,0)

 The call to glGetQueryiv yields the following error...

glGetQueryiv(GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN,GL_CURRENT_QUERY,self.TxFB_count)
File "latebind.pyx", line 32, in
OpenGL_accelerate.latebind.LateBind.*call*(src\latebind.c:667)
File "wrapper.pyx", line 296, in
OpenGL_accelerate.wrapper.Wrapper.*call*(src\wrapper.c:5215)
File "wrapper.pyx", line 148, in
OpenGL_accelerate.wrapper.PyArgCalculator.c_call (src\wrapper.c:3419)
ValueError: glGetQueryiv requires 2 arguments (target, pname), received 3:
(GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN, GL_CURRENT_QUERY, c_ulong(0L))

glGetQueryiv function signature is definitely 3 parameters, target, pname
and param.

I did try moving to 3.1.0b1, but had the following issue with
glGenBuffers()...

    buff = glGenBuffers(GLint(1))
  File "latebind.pyx", line 32, in
OpenGL_accelerate.latebind.LateBind.__call__ (src\latebind.c:667)
  File "wrapper.pyx", line 300, in
OpenGL_accelerate.wrapper.Wrapper.__call__ (src\wrapper.c:5257)
  File "wrapper.pyx", line 87, in
OpenGL_accelerate.wrapper.CArgCalculator.c_call (src\wrapper.c:2439)
  File "wrapper.pyx", line 68, in
OpenGL_accelerate.wrapper.CArgCalculatorElement.c_call (src\wrapper.c:2064)
  File "wrapper.pyx", line 63, in
OpenGL_accelerate.wrapper.CArgCalculatorElement.c_call (src\wrapper.c:1942)
  File "arraydatatype.pyx", line 287, in
OpenGL_accelerate.arraydatatype.Output.c_call (src\arraydatatype.c:4827)
  File "arraydatatype.pyx", line 219, in
OpenGL_accelerate.arraydatatype.ArrayDatatype.c_zeros
(src\arraydatatype.c:4005)
  File "arraydatatype.pyx", line 79, in
OpenGL_accelerate.arraydatatype.HandlerRegistry.c_get_output_handler
(src\arraydatatype.c:2080)
RuntimeError: ('Unable to find any output handler at all (not even
ctypes/numpy ones!)', 1, <OpenGL.platform.baseplatform.glGenBuffers object
at 0x02C1C2D8>)


Cheers,

Ed.