Wierd Opengl Error

[rockachu2]

Traceback (most recent call last):
  File "D:\Desktop\PyGL3Display1.9-alpha\examples\criticalMass.py", line 169, in <module>
    main()
  File "D:\Desktop\PyGL3Display1.9-alpha\examples\criticalMass.py", line 151, in main
    x = Level(10, (400,400))
  File "D:\Desktop\PyGL3Display1.9-alpha\examples\criticalMass.py", line 123, in __init__
    self.ballImg = LoadImage('ball.png')
  File "..\PyGL3Display\pygamesprites.py", line 71, in LoadImage
    return cls.Surfaceify(pygame.image.load(*args, **kwargs))
  File "..\PyGL3Display\pygamesprites.py", line 78, in Surfaceify
    Surface.__init__(ret, pygameSurface.get_size())
  File "..\PyGL3Display\twodimages.py", line 40, in __init__
    manager = SpriteCommon.defaultManager if manager is None else manager
  File "..\PyGL3Display\twodspriteinfrastructure.py", line 80, in __getattr__
    shader=cls.defaultShader)
  File "..\PyGL3Display\twodspriteinfrastructure.py", line 83, in __getattr__
    cls.makeDefaultShader()
  File "..\PyGL3Display\twodspriteinfrastructure.py", line 149, in makeDefaultShader
    cls.defaultShader = SpriteShader(cls.defaultVertexArrays)
  File "..\PyGL3Display\twodspriteinfrastructure.py", line 213, in __init__
    fragmentProgs=[fragmentProg])
  File "..\PyGL3Display\twodshaders.py", line 157, in __init__
    super(TwoDTexturedShader, self).__init__(**kwargs)
  File "..\PyGL3Display\twodshaders.py", line 115, in __init__
    **kwargs)
  File "..\PyGL3Display\sharedinfrastructure.py", line 415, in __init__
    self.setup()
  File "..\PyGL3Display\sharedinfrastructure.py", line 425, in setup
    vertexProg in self.vertexProgs]
  File "..\PyGL3Display\sharedinfrastructure.py", line 522, in getShader
    raise ShaderError(errorMessage)
ShaderError: Shader Error:
Source:

    vec2 applyTransform(in vec2 pos, in vec2 origin, in vec2 offset,
                        in float xScale, in float yScale, in float rotation)
    {
        vec2 offsets = vec2 ((offset.x - origin.x) * xScale,
                             (offset.y - origin.y) * yScale);
        mat2 rotMatrix = mat2 (cos(rotation), sin(rotation),
                              -sin(rotation), cos(rotation));
        offsets = (rotMatrix * offsets);
        vec2 ret = offsets + pos;
        return ret;
    }

Error:
Vertex shader was successfully compiled to run on hardware.

[rockachu2 (rockachu2)]

All the examples fail to run

am I doing something wrong?

[David Griffin (habilain)]

Probably not.. can you post OS/Graphics card/Drivers? I just want to know on the likelihood of dodgy drivers (every error like this thus far has been due to dodgy drivers).

In the meantime, I'll see if there's an easy way around it...

[rockachu2 (rockachu2)]

windows 7 x64
Ati radeon hd 5870 2gb
...
At catalyst 11.11 (not latest, because latest = bluescreen)

[rockachu2 (rockachu2)]

I suspect it's my pyopengl install.
It always has been.

[David Griffin (habilain)]

Nope, it's my code. Turns out I'm querying the InfoLog of the shader to determine if it has compiled, which on the drivers I tested returns an empty string if all is well. But it seems it doesn't have to, according to the spec, and I should use glGetShader instead.

Now, I've committed a proper fix to my own branch, but said branch is not ready for merging to trunk at the moment (working on examples, and well, most of them are broken; not just the text example as in the alpha release). So, in the meantime, a quick hacky fix is to open PyGL3Display/sharedinfrastructure.py, go to line 518. It should read: "shaderLog = glGetShaderInfoLog(shader).strip()" . Change this to "shaderLog = None" - this will disable error checking on shaders, but that should be fine as it's more of a development feature than anything else.

[David Griffin (habilain)]

And pretty much as soon as I say that I can't release a proper fix, I find the bug in my own branch and get everything ready for the alpha 2 release. Anyhow, alpha 2 should fix this bug.

Download: https://launchpad.net/pygl3display/trunk/1.9-alpha2