minecraft-python-edition/texturemanager.py at master · atomisadev/minecraft-python-edition · GitHub

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import ctypes
import pyglet

import pyglet.gl as gl


class TextureManager:
    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 = []

        self.texture_array = gl.GLuint(0)
        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(
            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.glGenerateMipmap(gl.GL_TEXTURE_2D_ARRAY)

    def add_texture(self, texture):
        if not texture in self.textures:
            self.textures.append(texture)

            texture_image = pyglet.image.load(
                f"textures/{texture}.png").get_image_data()
            gl.glBindTexture(gl.GL_TEXTURE_2D_ARRAY, self.texture_array)

            gl.glTexSubImage3D(
                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))