"RuntimeError: Validation failure (0)" trying to run examples on Debian Stretch about pyxel HOT 7 CLOSED

Based on the link failure, I narrowed it down to these lines:

int col = int(texture2D(u_texture[img], uv).r * 255.0);

According to this stackoverflow answer, we shouldn't be able to do this:

In GLSL 1.30 to 3.30, you can have sampler arrays, but with severe restrictions on the index. The index must be an integral constant expression. Thus, while you can declare a sampler array, you can't loop over it.

So I don't understand how this code was working ever? I suspect there's a disconnect in GL versions maybe? I worked around it by unwrapping the array access so the index is a constant and now things work:

https://gist.github.com/AndrewNelis/ea5d8780c2d6aab047b00f3f2d52aa7b

(can't attach patches to github comments 👎 )

Improvements welcome...

from pyxel.

Digging deeper, I added the validate argument to compileProgram and got a more useful error:

    def __init__(self, vertex_shader, fragment_shader):
        try:
            self._program = shaders.compileProgram(
                shaders.compileShader(vertex_shader, gl.GL_VERTEX_SHADER),
                shaders.compileShader(fragment_shader, gl.GL_FRAGMENT_SHADER), validate=False)
        except Exception as e:
            print(str(e).encode('utf-8').decode('unicode_escape'))
            raise SystemExit()
        self._att = None
        self._tex_list = []

Error output is now:

Link failure (0): b'Vertex info
-----------
0(32) : warning C7050: "v_max_pos" might be used before being initialized
0(31) : warning C7050: "v_min_pos" might be used before being initialized

Fragment info
-------------
0(154) : error C5208: Sampler needs to be a uniform (global or parameter to main), need to inline function or resolve conditional expression
0(155) : error C5208: Sampler needs to be a uniform (global or parameter to main), need to inline function or resolve conditional expression

I believe it's complaining about an issue with the DRAWING_FRAGMENT_SHADER, the blt() and text() functions.

from pyxel.

Hi, I'm seeing the same traceback:

• Pyxel version: master branch.
• OS: Fedora 27
• Python version: 3.3.6
• Video Driver: NVIDIA 340.107
• Video card: VGA compatible controller: NVIDIA Corporation GT218 [GeForce 210] (rev a2)

I've attached glxinfo.txt in case that helps.

As above, the traceback message is empty so I can't see what's wrong.

from pyxel.

I see.
I shouldn't use variables to specify the index of the texture image array in GLSL.

I'll change to use if as your patch.

from pyxel.

Thank you!
I fixed this bug in Pyxel 0.7.5.

from pyxel.

Thanks for patching.

from pyxel.

i'm on windows 8.1 x64, Pyxel 0.9.5 but still get the same error, any help will be appreciated

from pyxel.