Cannot import from ShaderToy via loader about glslviewer HOT 12 CLOSED

I think you have to add:

#ifdef GL_ES
precision mediump float;
#endif 

from glslviewer.

iTime has to be renamed:

uniform float u_time;

from glslviewer.

OK, I did the following manually:

• Added float: medium
• replaced all iTime to u_time
• added u_time global
• replaced all iResolution to u_resolution
• added u_resolution global

No errors now, but all I see is 100% whiteness.

http://thebookofshaders.com/edit.php?log=171214193921

from glslviewer.

replace with

void main(  )
{
    vec3 finalColor; 
    vec2 uv = gl_FragCoord.xy;
    //center of the image
    vec2 c = u_resolution.xy/2.0;
    finalColor = vec3( 0.3*_cross(uv, c, 240.0) );
    finalColor += ( circle(uv, c, 100.0, 1.0)
                  + circle(uv, c, 165.0, 1.0) ) * blue1;
    finalColor += (circle(uv, c, 240.0, 2.0) );//+ dots(uv,c,240.0)) * blue4;
    finalColor += circle3(uv, c, 313.0, 4.0) * blue1;
    finalColor += triangles(uv, c, 315.0 + 30.0*sin(u_time)) * blue2;
    finalColor += movingLine(uv, c, 240.0) * blue3;
    finalColor += circle(uv, c, 10.0, 1.0) * blue3;
    finalColor += 0.7 * circle2(uv, c, 262.0, 1.0, 0.5+0.2*cos(u_time)) * blue3;
    if( length(uv-c) < 240.0 )
    {
        //animate some bips with random movements
        vec2 p = 130.0*MOV(1.3,1.0,1.0,1.4,3.0+0.1*u_time);
        finalColor += bip1(uv, c+p) * vec3(1,1,1);
        p = 130.0*MOV(0.9,-1.1,1.7,0.8,-2.0+sin(0.1*u_time)+0.15*u_time);
        finalColor += bip1(uv, c+p) * vec3(1,1,1);
        p = 50.0*MOV(1.54,1.7,1.37,1.8,sin(0.1*u_time+7.0)+0.2*u_time);
        finalColor += bip2(uv,c+p) * red;
    }

    gl_FragColor = vec4( finalColor, 1.0 );
}

from glslviewer.

Cool, it works, thanks!

So it was in addition:

• fragCoord -> gl_FragCoord
• fragColor -> gl_FragColor
• void mainImage( out vec4 fragColor, in vec2 fragCoord ) -> void main()

?

from glslviewer.

exactly!

from glslviewer.

Cool, I might submit a PR to glslLoader so it could convert files from disk at least.

Any idea why does editor display only a cropped view, while glslViewer displays more of the extents?

from glslviewer.

Are you in a retina laptop? If that's the case glslViewer will make use of that

from glslviewer.

ShaderToy have a custom scheme they use to wrap shaders and allow things like doing WebVR. Is not fragCoord, fragColor and mainImage() are not part of GLSL language.

from glslviewer.

Yes, I have retina. But isn't the view always 0,0->1,1? How can one view display totally different parts then the other (in the same aspect ratio)?

from glslviewer.

Related #101

from glslviewer.

I believe is not about the aspect ration but about the pixel density. Because the scene is constructed from the center (.5,.5) with the double of the pixels things looks scaled at the half of the size.

Obviously this is not ideal. Needs to be fixed.

thanks for the patience

from glslviewer.