Recent malfunction on the web version

[riccardoscalco]

Hi, I am using a lot the editor at http://editor.thebookofshaders.com/.

Unfortunately recently I noted a malfunction, my shaders do not work anymore.
I can open the editor and the initial shader is visible, but if I change the code the canvas is not updated.

The following shader for example does not work:

#ifdef GL_ES
precision mediump float;
#endif

uniform vec2 u_resolution;

void main() {
	vec2 st = gl_FragCoord.xy/u_resolution;
	gl_FragColor = vec4(st, 1., 1.);
}

I tested the editor in Chrome, Safari and Firefox in macos.

Thanks for your work, I really appreciate.

[patriciogonzalezvivo]

Hi @riccardoscalco, I think I know where the problem originates... what happen if you change the size of the viewport?

Yesterday I detect a bug on GlslCanvas where doesn't render shader with no animation. The lack of u_time or u_mouse usually triggers a flag where the shader is only rendered when something change... and not constantly. I will take a look to that today

[riccardoscalco]

Probably your intuition is correct, this code works as expected:

#ifdef GL_ES
precision mediump float;
#endif

uniform vec2 u_resolution;
uniform float u_time;

void main() {
    vec2 st = gl_FragCoord.xy/u_resolution;
    gl_FragColor = vec4(st, 1.0, u_time);
}

There is no hurry on my side, thanks for the effort.

[harry-isaac]

Hey, just wanted to +1 this and say I'm experiencing the issue too. A quick work around I realized, as you mentioned, is to add u_time somewhere. Doesn't even need to be in code, can be in a comment. So for now I'm just adding it to the top of my shaders like this:

//u_time

#ifdef GL_ES
precision mediump float;
#endif

uniform vec2 u_resolution;
uniform float u_time;

void main() {
    vec2 st = gl_FragCoord.xy/u_resolution;
    gl_FragColor = vec4(st, 0.0, 1.0);
}

[patriciogonzalezvivo]

Hi! sorry for this regression. I'll work on it

[patriciogonzalezvivo]

Ok... I think now is fixed @harryslotwiner @riccardoscalco could you give it a try?

[riccardoscalco]

@patriciogonzalezvivo I confirm, it works. Thanks!