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#version 120
#extension GL_EXT_geometry_shader4: enable
void main(void)
{
//increment variable
int i,j;
float rnd1,rnd2;
rnd1 = 0.0216767863321334264; // seed
rnd2 = 0.0475785688678678345;
for(j=0; j< 40; j++)
{
rnd1 = fract(124.321345312123465*rnd1) -0.5; // easy way to generated pseudo random number
rnd2 = fract(5234.43532345435245*rnd2) -0.5;
//draw 40 time the same geometry, but with small shift in it's position
for(i=0; i< gl_VerticesIn; i++)
{
gl_FrontColor = gl_FrontColorIn[i];
gl_TexCoord[0] = gl_TexCoordIn[i][0];
gl_Position = gl_PositionIn[i]; // get position of the original point
gl_Position.xy += vec2(rnd1,rnd2)/3.; // add small random
// the geometry as already been transform in 2d, so we jut have to move it in X and Y
EmitVertex();
}
EndPrimitive();
}
}
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