uniform mat4 uMVPMatrix;
uniform mat4 uTexMatrix;
attribute vec4 aPosition;
attribute vec4 aTextureCoord;
varying vec2 vTextureCoord;

/**
* This vertex shader maps the projection matrix to the
* position of the frame and then forwards
* the coordinates of the texture to a vertex shader
*/
void main() {
    gl_Position = uMVPMatrix * aPosition;
    vTextureCoord = (uTexMatrix * aTextureCoord).xy;
}