texture_manager.py

import ctypes
import pyglet
import pyglet.gl as gl

class Texture_manager:
    def __init__(self, texture_width, texture_height, max_textures):
        self.texture_width = texture_width
        self.texture_height = texture_height

        self.max_textures = max_textures
        self.textures = [] # an array to keep track of the textures we've already added

        self.texture_array = gl.GLuint(0)  #create our texture array
        gl.glGenTextures(1, self.texture_array)
        gl.glBindTexture(gl.GL_TEXTURE_2D_ARRAY, self.texture_array)

        gl.glTexParameteri(gl.GL_TEXTURE_2D_ARRAY, gl.GL_TEXTURE_MIN_FILTER, gl.GL_NEAREST)
        gl.glTexParameteri(gl.GL_TEXTURE_2D_ARRAY, gl.GL_TEXTURE_MAG_FILTER, gl.GL_NEAREST)

        gl.glTexImage3D(     # set the dimensions of our texture array
            gl.GL_TEXTURE_2D_ARRAY, 0, gl.GL_RGBA,
            self.texture_width, self.texture_height, self.max_textures,
            0, gl.GL_RGBA, gl.GL_UNSIGNED_BYTE, None)
        
    def generate_mipmaps(self):
        gl.glBindTexture(gl.GL_TEXTURE_2D_ARRAY, self.texture_array) # make sure our texture is bound
        gl.glGenerateMipmap(gl.GL_TEXTURE_2D_ARRAY)  # generate mipmaps for our texture

    def add_texture(self, texture):
        if not texture in self.textures: # check to see if our texture has not yet been added
            self.textures.append(texture) # add it to our textures list if not
            
            texture_image = pyglet.image.load(f"textures/{texture}.png").get_image_data() # load and get the image data of the texture we want
            gl.glBindTexture(gl.GL_TEXTURE_2D_ARRAY, self.texture_array) # make sure our texture array is bound
            
            gl.glTexSubImage3D( # paste our texture's image data in the appropriate spot in our texture array
                gl.GL_TEXTURE_2D_ARRAY, 0,
				0, 0, self.textures.index(texture),
				self.texture_width, self.texture_height, 1,
				gl.GL_RGBA, gl.GL_UNSIGNED_BYTE,
				texture_image.get_data("RGBA", texture_image.width * 4))