firefox - bit-wise operator supported in GLSL ES 3.00 and above only -

i'm trying make function bit position color in glsl.

 precision highp float;  uniform sampler2d utexture0;  varying vec2 vtexturecoords;  int getbit(float color, int bit){         highp int colorint = int(color);         return (colorint >> bit) & 1; }  void main(void) {    highp vec4 texelcolour = texture2d(utexture0, vec2(vtexturecoords.s, vtexturecoords.t));   if(getbit(texelcolour.r * 255.0, 7) == 1 ){        gl_fragcolor = vec4(0.5, 0.8, 0.5, 0.8);  }else{        gl_fragcolor = vec4(0.4, 0.1, 0.0, 0.0);  } 

}

chrome , firefox return error

error: 0:35: '>>' : bit-wise operator supported in glsl es 3.00 , above   error: 0:35: '&' : bit-wise operator supported in glsl es 3.00 , above   

i'm trying force version in first line of shader, :

#version 130 

but console return version not supported.

is there way create subroutines getbit function ? or settings enable implements bitwize operator in sharder fragment ?

thanks reply.

guillaume

i'm finding solution in writing own , shift function

 int getbit(float num, float b){         num = num * 255.0;         int bit = 0;         for(int = 7; >= 0; i--){             if(num >=  pow(2.0,float(i))){                 num = num - pow(2.0,float(i));                 if(b == float(i)){                     bit = 1;                 }             }         }         return bit;     }    if(getbit(texelcolour.r , 3.0) != 0 && getbit(texelcolour.g * 255.0, 0.0) == 0 &&  getbit(texelcolour.b * 255.0, 0.0) == 0){    gl_fragcolor = vec4(0.5, 0.8, 0.5, 0.8); }else{    gl_fragcolor = vec4(0.4, 0.1, 0.0, 0.0); } 

i'm newb in glsl can surely better works.

ps: need 1 byte decimal

guillaume