Re: [pygame] Re: (pyopengl) GLSL fragment shader with arrays uniform cause sporadic screen blinking

[Devon Scott-Tunkin <devon.scotttunkin@xxxxxxxxx>]

You may want to check out http://www.opengl.org/wiki/GLSL_Uniform#Implementation_limits . You can check the uniform limits of your video card with glGetIntegerv(GL_MAX_FRAGMENT_UNIFORM_COMPONENTS, yourReturnVar)

On Fri, Feb 11, 2011 at 4:31 PM, amdlintuxo <amdlintuxos@xxxxxxxxx> wrote:

THE PROBLEM IS SOLVED by decreasing array elements at stage of
declaration in shader from 100 down to 20.


> On Feb 12, 1:09 am, Devon Scott-Tunkin <devon.scotttun...@xxxxxxxxx> wrote:
> Thehttp://bpaste.net/show/13617/is not the same because the glsl compiler

> will usually compile out (make inactive) all of your uniforms since you
> aren't referencing them in the shader. I often find this very annoying for
> testing.

All time forgot this, thanks for clarification.

> I've often had problems with arrays in glsl, and never got them to
> work correctly in os x. You could try using a 1D texture lookup if the
> arrays are the problem.

Unfortunately i don't know how to implement my desires other way, so
for now i will go with arrays, but keep you advice in my mind.
Thanks.

> I don't really understand what you are trying to do in your pixel shader,
> you could get rid of all of the else's and just put gl_FragColor at the end
> of main and it would have the same effect. Your loop just changes the final
> uv, so in effect you don't even need a for loop because your code will
> always just make the end color by using imax-1. Everything else gets
> overwritten.

I am not strong in programming. First my task was is to get it working
fine, the next stage will optimize code and make it looks better.
The reason i have chose this way - i am not sure if i will stuck in
future and have to change the whole render method(shader) or not. It
happens several times.
Thanks for advices, as now it works as i would expected i will make
shader looks better following you comments and post it here.