diff --git a/kitty/develop_gl.py b/kitty/develop_gl.py
deleted file mode 100644
index d661257ac..000000000
--- a/kitty/develop_gl.py
+++ /dev/null
@@ -1,166 +0,0 @@
-#!/usr/bin/env python3
-# vim:fileencoding=utf-8
-# License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
-
-import glfw
-import sys
-import ctypes
-
-from kitty.shaders import ShaderProgram, GL_VERSION, Sprites
-from kitty.fonts import set_font_family, cell_size
-from kitty.char_grid import calculate_screen_geometry, cell_shader
-from kitty.fast_data_types import (
-    glViewport, enable_automatic_opengl_error_checking, glClearColor,
-    glUniform2f, glUniform4f, glUniform2ui, glUniform1i, glewInit, glGetString,
-    GL_VERSION as GL_VERSION_C, GL_VENDOR, GL_SHADING_LANGUAGE_VERSION, GL_RENDERER,
-    glClear, GL_COLOR_BUFFER_BIT, GL_TRIANGLE_FAN, glDrawArraysInstanced,
-    Cursor, LineBuf, ColorProfile, DATA_CELL_SIZE, GLFW_CONTEXT_VERSION_MAJOR,
-    GLFW_CONTEXT_VERSION_MINOR, GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE,
-    GLFW_OPENGL_FORWARD_COMPAT
-)
-
-
-def rectangle_uv(left=0, top=0, right=1, bottom=1):
-    return (
-        right, top,
-        right, bottom,
-        left, bottom,
-        right, top,
-        left, bottom,
-        left, top,
-    )
-
-
-class Renderer:
-
-    def __init__(self, w, h):
-        self.w, self.h = w, h
-        self.color_pairs = (
-            (0xffffff, 0),
-            (0, 0xffffff),
-            (0xffff00, 0x0000ff)
-        )
-        self.color_profile = ColorProfile()
-        self.program = ShaderProgram(*cell_shader)
-        self.sprites = Sprites()
-        self.do_layout()
-
-    def on_resize(self, window, w, h):
-        glViewport(0, 0, w, h)
-        self.w, self.h = w, h
-        self.do_layout()
-
-    def do_layout(self):
-        # Divide into cells
-        cell_width, cell_height = cell_size()
-        self.sprites.do_layout(cell_width, cell_height)
-        self.sprites.ensure_state()
-        self.screen_geometry = sg = calculate_screen_geometry(cell_width, cell_height, self.w, self.h)
-        data = (ctypes.c_uint * (sg.xnum * sg.ynum * DATA_CELL_SIZE))()
-        lb = LineBuf(sg.ynum, sg.xnum)
-        i = -1
-        for y in range(sg.ynum):
-            line = lb.line(y)
-            for x in range(sg.xnum):
-                i += 1
-                c = Cursor()
-                fg, bg = self.color_pairs[i % 3]
-                c.fg = (fg << 8) | 3
-                c.bg = (bg << 8) | 3
-                c.decoration = 2
-                c.strikethrough = True
-                c.x = x
-                line.set_text('%d' % (i % 10), 0, 1, c)
-            self.sprites.backend.update_cell_data(line, 0, sg.xnum - 1, self.color_profile, 0xffffff, 0, ctypes.addressof(data))
-        self.sprites.render_dirty_cells()
-        self.sprites.set_sprite_map(data)
-
-    def render(self):
-        self.sprites.render_dirty_cells()
-        with self.program:
-            ul = self.program.uniform_location
-            sg = self.screen_geometry
-            glUniform2ui(ul('dimensions'), sg.xnum, sg.ynum)
-            glUniform4f(ul('steps'), sg.xstart, sg.ystart, sg.dx, sg.dy)
-            glUniform1i(ul('sprites'), self.sprites.sampler_num)
-            glUniform1i(ul('sprite_map'), self.sprites.buffer_sampler_num)
-            glUniform2f(ul('sprite_layout'), *self.sprites.layout)
-            with self.sprites:
-                glDrawArraysInstanced(GL_TRIANGLE_FAN, 0, 4, sg.xnum * sg.ynum)
-
-# window setup {{{
-
-
-def key_callback(key, action):
-    """ Sample keyboard callback function """
-    print('Key: %s Action: %s pressed' % (key, action))
-
-
-def gl_get_unicode(k):
-    ans = glGetString(k)
-    if isinstance(ans, bytes):
-        try:
-            ans = ans.decode('utf-8')
-        except Exception:
-            ans = repr(ans)
-    return ans
-
-
-def _main():
-    # These Window hints are used to specify
-    # which opengl version to use and other details
-    # for the opengl context that will be created
-    glfw.glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, GL_VERSION[0])
-    glfw.glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, GL_VERSION[1])
-    glfw.glfwWindowHint(GLFW_OPENGL_PROFILE,
-                        GLFW_OPENGL_CORE_PROFILE)
-    glfw.glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, True)
-
-    window = glfw.glfwCreateWindow(
-        1024, 1024, "Trying this crap".encode('utf-8'), None, None)
-    if not window:
-        raise SystemExit("glfwCreateWindow failed")
-    glfw.glfwMakeContextCurrent(window)
-    glewInit()
-    glfw.glfwSwapInterval(1)
-
-    # If everything went well the following calls
-    # will display the version of opengl being used
-    print('Vendor: %s' % (gl_get_unicode(GL_VENDOR)))
-    print('Opengl version: %s' % (gl_get_unicode(GL_VERSION_C)))
-    print('GLSL Version: %s' % (gl_get_unicode(GL_SHADING_LANGUAGE_VERSION)))
-    print('Renderer: %s' % (gl_get_unicode(GL_RENDERER)))
-
-    r = Renderer(1024, 1024)
-    glfw.glfwSetFramebufferSizeCallback(window, r.on_resize)
-    try:
-        glClearColor(0.5, 0.5, 0.5, 0)
-        while not glfw.glfwWindowShouldClose(window):
-            glClear(GL_COLOR_BUFFER_BIT)
-            r.render()
-            glfw.glfwSwapBuffers(window)
-            glfw.glfwWaitEvents()
-    finally:
-        glfw.glfwDestroyWindow(window)
-
-
-def on_error(code, msg):
-    if isinstance(msg, bytes):
-        try:
-            msg = msg.decode('utf-8')
-        except Exception:
-            msg = repr(msg)
-    print(msg, file=sys.stderr)
-
-
-def main():
-    glfw.glfwSetErrorCallback(on_error)
-    if not glfw.glfwInit():
-        raise SystemExit('GLFW initialization failed')
-    enable_automatic_opengl_error_checking(True)
-    set_font_family('monospace', 144)
-    try:
-        _main()
-    finally:
-        glfw.glfwTerminate()
-# }}}