gistfile1.glsl

layout(location = 0) uniform mat4 transformationMatrix;
layout(location = 1) uniform mat4 projectionMatrix;
layout(location = 2) uniform mat3 normalMatrix;
layout(location = 3) uniform vec3 light;

layout(location = 0) in vec4 position;
layout(location = 2) in mediump vec3 normal;

out mediump vec3 transformedNormal;
out highp vec3 lightDirection;
out highp vec3 cameraDirection;


void main() {
    /* Transformed vertex position */
    highp vec4 transformedPosition4 = transformationMatrix*position;
    highp vec3 transformedPosition = transformedPosition4.xyz/transformedPosition4.w;

    /* Transformed normal vector */
    transformedNormal = normalMatrix*normal;

    /* Direction to the light */
    lightDirection = normalize(light - transformedPosition);

    /* Direction to the camera */
    cameraDirection = -transformedPosition;

    /* Transform the position */
    gl_Position = projectionMatrix*transformedPosition4;

}