`
    //uniforms
//    uniform mat4 uNormalMatrix;
//    uniform mat4 uModelViewMatrix;
//    uniform mat4 uProjectionMatrix;
    
    //attribute
    attribute vec4 aVertexPosition;
    attribute vec3 aVertexNormal;
    attribute vec2 aTextureCoord;
    
    //varying 
    varying highp vec2 vTextureCoord;
    varying highp vec3 vLighting;

//////////// djafer ////////
 mat4 ajustwMatrix (float theta) {
     return  mat4(
        vec4(cos(theta),  sin(theta),  0.0, 0.0),
        vec4(-sin(theta), cos(theta),  0.0, 0.0),
        vec4(0.0,         0.0,         1.0, 0.0),
        vec4(0.0,         0.0,         0.0, 1.0)
    ); 
 
 }
mat4 rotate_x(float theta)
{
    return mat4(
        vec4(1.0,  0.0,         0.0,        0.0),
        vec4(0.0,  cos(theta),  sin(theta), 0.0),
        vec4(0.0, -sin(theta),  cos(theta), 0.0),
        vec4(0.0,  0.0       ,  0.0       , 1.0)
    );
}

mat4 rotate_y(float theta)
{
    return mat4(
        vec4(cos(theta),  0.0, sin(theta), 0.0),
        vec4(0.0,         1.0, 0.0       , 0.0),
        vec4(-sin(theta), 0.0, cos(theta), 0.0),
        vec4(0.0,         0.0, 0.0,        1.0)
    );
}

mat4 rotate_z(float theta)
{
    return mat4(
        vec4(cos(theta),  sin(theta),  0.0, 0.0),
        vec4(-sin(theta), cos(theta),  0.0, 0.0),
        vec4(0.0,         0.0,         1.0, 0.0),
        vec4(0.0,         0.0,         0.0, 1.0)
    );
}


////////// end /////////////
    void main(void) {
//      gl_Position = uProjectionMatrix * uModelViewMatrix * aVertexPosition;
 //     gl_Position =  aVertexPosition * ajustwMatrix (15.0 ); //vec4(1.0, 1.0, 0.45 , 1.0 );
      gl_Position =  aVertexPosition  ; 
      vTextureCoord = aTextureCoord;
      // Apply lighting effect
      highp vec3 ambientLight = vec3(0.3, 0.3, 0.3);
      highp vec3 directionalLightColor = vec3(1, 1, 1);
      highp vec3 directionalVector = normalize(vec3(0.85, 0.8, 0.75));
//      highp vec4 transformedNormal = uNormalMatrix * vec4(aVertexNormal, 1.0);
//     highp float directional = max(dot(transformedNormal.xyz, directionalVector), 0.0);
 //     vLighting = ambientLight + (directionalLightColor * directional);      
      vLighting = ambientLight ; //+ (directionalLightColor );
    }
  `