/*

    Copyright (C) 2015 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    Vertex shader that passes attributes through to fragment shader.

 */

attribute vec4 position;

attribute vec2 texCoord;

uniform float preferredRotation;

varying vec2 texCoordVarying;

void main()

{

    mat4 rotationMatrix = mat4( cos(preferredRotation), -sin(preferredRotation), 0.0, 0.0,

                                sin(preferredRotation),  cos(preferredRotation), 0.0, 0.0,

                                                   0.0,                     0.0, 1.0, 0.0,

                                                   0.0,                     0.0, 0.0, 1.0);

    gl_Position = position * rotationMatrix;

    texCoordVarying = texCoord;

}