#extension GL_EXT_gpu_shader4 : require
#extension GL_EXT_geometry_shader4 : enable
#extension GL_EXT_texture_integer : enable

uniform int depth;
varying float sphIndex;

uniform sampler3D tex;
uniform isampler3D texIndex;
uniform isampler2D texIndexStartPoint;

void main()
{
    ivec2 vertCoord;

        vec4 color = vec4(1.0, 1.0, 1.0, 1.0);
    vec4 lastColor;

    vertCoord.s = (int)(gl_TexCoord[0].s*300.0);
    vertCoord.t = (int)(gl_TexCoord[0].t*300.0);

    vec4 startPointValuev4 = texelFetch(texIndexStartPoint, vertCoord, 0);
        int startPointValue = (int)startPointValuev4.r;


        if(startPointValue*1.0 == (19049758.0+0.5)  ) color = vec4(0.0, 0.0, 1.0, 1.0);

        gl_FragColor = color;
}