from OpenGL.GL import *
from OpenGL.GLU import *
from OpenGL.GLUT import *
import numpy as np
from gl_implement import gl_primitives as prm

width, height = 640,480


def compile_shader(sourse, type) :
    id = glCreateShader(GL_VERTEX_SHADER)
    glShaderSource(id, sourse)
    glCompileShader(id)

    result = glGetShaderiv(id, GL_COMPILE_STATUS)
    if result == GL_FALSE :
        print('that\'s a sheet')
        glDeleteShader(id)
        return

    return id;

def create_vertex_shader(vertexShader) :
    program = glCreateProgram()
    vs = compile_shader(GL_VERTEX_SHADER, vertexShader)

    glAttachShader(program)
    glLinkProgram(program)
    glValidateProgram(program)

    glDeleteShader(vs)

    return program

def draw() :
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
    glLoadIdentity()

    position = np.array([[-1/2, 1/2, 0],[1/2, 1/2, 0],[1/2, -1/2, 0],[-1/2, -1/2, 0]], dtype='float32')

    # # import ctypes
    # # arr = (ctypes.c_int * 3 * 4)(*(tuple(j) for j in position))
    # # # print(arr)
    # # # print('size numpy arr : \n', sys.getsizeof(pyarr)/8, 'size c arr : ',  sys.getsizeof(arr)/8)
    # #
    # # # buffer = Gluint(position[0])
    # from OpenGL.arrays import vbo
    # coords = vbo.VBO(position)
    # print(coords)
    buffer = 0
    glGenBuffers(1, buffer)
    glBindBuffer(GL_ARRAY_BUFFER, buffer)
    glBufferData(GL_ARRAY_BUFFER, position.nbytes, position ,GL_STATIC_DRAW)

    glEnableVertexAttribArray(0)
    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 16 ,0)

    glBindBuffer(GL_ARRAY_BUFFER, 0)

    vertexShader = """
    #version 400
    layout(location = 0) in vec4 position;

    void main() {
         gl_Position = position
    }
    """

    shader = create_vertex_shader(vertexShader)
    glUseProgram(shader);

    # prm.draw_quad(30, [0.1, 0.8, 0.2, 1], [[-1/2, 1/2, 0],[1/2, 1/2, 0],
    # [1/2, -1/2, 0],[-1/2, -1/2, 0]], 'fill')

    glutSwapBuffers()



def Init_GL_Window(num_window, width, height) :
    glutInit()
    glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH)
    glutInitWindowSize(width, height)
    glutInitWindowPosition(300, 300)
    window = glutCreateWindow("My First app on OpenGL")

    glutDisplayFunc(draw)
    glClearColor(.6, .2, .4 , 1.0) # background color
    glutMainLoop()

def main() :
    Init_GL_Window(0, width, height);

if __name__ == '__main__' : main() # указываем что этот фаил является главным