gl_Position = model * view * perspective * in_Position

gl_Position = perspective * model * view * in_Position

Matrix CreateProjectionMatrix(
   float fovy,
   float aspect_ratio,
   float near_plane,
   float far_plane
)
{
   Matrix out = { { 0 } };

   const float
      y_scale = Cotangent(DegreesToRadians(fovy / 2)),
      x_scale = y_scale / aspect_ratio,
      frustum_length = far_plane - near_plane;

   out.m[0] = x_scale;
   out.m[5] = y_scale;
   out.m[10] = -((far_plane + near_plane) / frustum_length);
   out.m[11] = -1;
   out.m[14] = -((2 * near_plane * far_plane) / frustum_length);
   
   return out;
}

public static Matrix4f projection(fov: Float, aspectRatio: Float, near: Float, far: Float) {
Matrix4f out = new Matrix4f();
float yScale = 1.0f / scala.math.tan((fov / 2.0f).toRadians).toFloat;
float xScale = yScale / aspectRatio;
float frustumLength = far - near;
         
float[] tempArray = new float[16];
tempArray[0] = xScale;
tempArray[5] = yScale;
tempArray[10] = -((far + near) / frustumLength);
tempArray[11] = -1;
tempArray[14] = -((2 * near * far) / frustumLength);
         
FloatBuffer buf = BufferUtils.createFloatBuffer(16);
buf.put(tempArray);
buf.flip();
out.load(buf);
return out;
}

//This is the method call
Matrix.projection(60.0f, 800.0f / 600.0f, 1.0f, 100.0f);

//and when I print the matrix that is returned I get this
1.2990382 0.0 0.0 0.0
0.0 1.7320509 0.0 0.0
0.0 0.0 -1.020202 -2.020202
0.0 0.0 -1.0 0.0