ShaderVS.txt

//f function gets imported by textbox in website
precision highp float;
attribute vec4 GridPoint;
uniform mat4 TTO;
uniform mat4 RTA;
uniform mat4 Proj;
uniform mat4 TTR;
uniform mat4 RS;
uniform mat4 TTRB;
varying float intensity;

highp mat4 T(in highp mat4 inMatrix)
{
    highp vec4 i0 = inMatrix[0];
    highp vec4 i1 = inMatrix[1];
    highp vec4 i2 = inMatrix[2];
    highp vec4 i3 = inMatrix[3];
    highp mat4 outMatrix = mat4(vec4(i0.x, i1.x, i2.x, i3.x),
                                vec4(i0.y, i1.y, i2.y, i3.y),
                                vec4(i0.z, i1.z, i2.z, i3.z),
                                vec4(i0.w, i1.w, i2.w, i3.w));
    return outMatrix;    
}

void main()
{
    vec4 DisplayPos = T(Proj)*T(RTA)*T(TTO)*T(TTRB)*RTA*T(RS)*T(TTR)*vec4(GridPoint.xy, -GridPoint.z, 1.0);
    gl_Position = DisplayPos;
    //gl_PointSize = 1.5;  //Causes failure on certain devices (mainly mobile)
    intensity = GridPoint.w;
}