Re: [PyOpenGL-Users] Shader doesn't compile with Python 3

[Gabriele L. <gab...@gm...>]

@Chris yes, that's basically the issue. The function glShaderSource in py3
wants an 'str' object instead of a 'bytes' one. If you pass a 'bytes' you
have to convert it to 'str'. And in the non-bzr version there is probably
some code that doesn't correctly handles bytes strings.

I was able to solve the problem by backporting the function compileshader.
In this way it works with both py2 and py3:

def compileShader( source, shaderType ):

    """Compile shader source of given type
        source -- GLSL source-code for the shader
    shaderType -- GLenum GL_VERTEX_SHADER, GL_FRAGMENT_SHADER, etc,
        returns GLuint compiled shader reference
    raises RuntimeError when a compilation failure occurs
    """
    if isinstance(source, str):

        source = [source]
    elif isinstance(source, bytes):

        source = [source.decode('utf-8')]

    shader = glCreateShader(shaderType)
    glShaderSource(shader, source)
    glCompileShader(shader)
    result = glGetShaderiv(shader, GL_COMPILE_STATUS)

    if not(result):
        # TODO: this will be wrong if the user has
        # disabled traditional unpacking array support.
        raise RuntimeError(
            """Shader compile failure (%s): %s"""%(
                result,
                glGetShaderInfoLog( shader ),
            ),
            source,
            shaderType,
        )
    return shader




On Wed, May 29, 2013 at 9:23 AM, Chris Barker - NOAA Federal <
chr...@no...> wrote:

> On Tue, May 28, 2013 at 10:53 PM, Gabriele Lanaro
> <gab...@gm...> wrote:
> > I'm having the same problem in python 3 (not being able to compile the
> > shaders because it gets an invalid literal). Did you find any actual
> > workaround for that?
>
> IIUC shaders have to be written in ASCII, perhaps with Py3, you are
> passing unicode in -- ty encoding it to ascii and passing the bytes
> object instead.
>
> Or maybe I totally mis-understand the issue!
>
> -Chris
>
>
>
> --
>
> Christopher Barker, Ph.D.
> Oceanographer
>
> Emergency Response Division
> NOAA/NOS/OR&R            (206) 526-6959   voice
> 7600 Sand Point Way NE   (206) 526-6329   fax
> Seattle, WA  98115       (206) 526-6317   main reception
>
> Chr...@no...
>