glut_239.vert

// our vertex data
attribute vec3 aPosition;

// our texcoordinates
attribute vec2 aTexCoord;

void main()
{
  // copy the position data into a vec4, using 1.0 as the w component
  vec4 positionVec4 = vec4(aPosition, 1.0);
  positionVec4.xy = positionVec4.xy * 2.0 - 1.0;

  // send the vertex information on to the fragment shader
  gl_Position = positionVec4;
}