Better clickable link: http://www.dgp.toronto.edu/~mccrae/projects/firebox/home2/graphspheff.txt

I'm not actually compiling it as is, I'm compiling it after dumping it by running janusvr with MESA_GLSL=log. This is the source I am compiling (minus the error message at the end that mesa dumped into it):

/* Shader 42 source, checksum 0 */
#define lowp
#define mediump
#define highp
uniform sampler2D iChannel0;
uniform float iGlobalTime;

void main(void) {
    vec4 col = texture(iChannel0,gl_TexCoord[0].st);
    float i = abs(sin(15.*col.w iGlobalTime*6.)*3.*col.w)*.7;
    gl_FragColor = vec4(i*.4,i*.48,i,i .8);
}

/* Compile status: fail */
/* Log Info: */
0:8(13): error: no matching function for call to `texture(sampler2D, vec2)'; candidates are:

glslangValidator also doesn't like this shader.

The real reason is that GLSL compilers are supposed to fall back to #version 110 if no version is given.

With #version 130 it compiles with mesa's glsl compiler and glslangValidator doesn't complain either.

The tricky thing is that janusvr adds

#define lowp
#define mediump
#define highp

at the beginning, so the shader txt can't include the version, because else we get 0:5(1): preprocessor error: #version must appear on the first line.

Adding the version in janusvr is maybe not a good idea because maybe other people would like to use other GLSL versions.