pysdl2.py

# -*- coding: utf-8 -*-
from sdl2 import *
import ctypes
import OpenGL.GL as gl

import imgui
from imgui.integrations.sdl2 import SDL2Renderer


def main():
    window, gl_context = impl_pysdl2_init()
    renderer = SDL2Renderer(window)

    running = True
    event = SDL_Event()
    while running:
        while SDL_PollEvent(ctypes.byref(event)) != 0:
            if event.type == SDL_QUIT:
                running = False
                break
            renderer.process_event(event)
        renderer.process_inputs()

        imgui.new_frame()

        if imgui.begin_main_menu_bar():
            if imgui.begin_menu("File", True):

                clicked_quit, selected_quit = imgui.menu_item(
                    "Quit", 'Cmd+Q', False, True
                )

                if clicked_quit:
                    exit(1)

                imgui.end_menu()
            imgui.end_main_menu_bar()

        imgui.show_test_window()

        imgui.begin("Custom window", True)
        imgui.text("Bar")
        imgui.text_colored("Eggs", 0.2, 1., 0.)

        sel = imgui.selectable('click me to give draw list & segfault', False)
        if sel[1]: # clicked
            print "draws"
            draws = imgui.get_draw_data()
            print draws
            print draws.commands_lists

        imgui.end()

        gl.glClearColor(1., 1., 1., 1)
        gl.glClear(gl.GL_COLOR_BUFFER_BIT)

        imgui.render()

        SDL_GL_SwapWindow(window)

    renderer.shutdown()
    SDL_GL_DeleteContext(gl_context)
    SDL_DestroyWindow(window)
    SDL_Quit()


def impl_pysdl2_init():
    width, height = 1280, 720
    window_name = "minimal ImGui/SDL2 example"

    if SDL_Init(SDL_INIT_EVERYTHING) < 0:
        print("Error: SDL could not initialize! SDL Error: " + SDL_GetError())
        exit(1)

    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1)
    SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24)
    SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8)
    SDL_GL_SetAttribute(SDL_GL_ACCELERATED_VISUAL, 1)
    SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1)
    SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, 16)
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, SDL_GL_CONTEXT_FORWARD_COMPATIBLE_FLAG)
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 4)
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1)
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE)

    SDL_SetHint(SDL_HINT_MAC_CTRL_CLICK_EMULATE_RIGHT_CLICK, b"1")
    SDL_SetHint(SDL_HINT_VIDEO_HIGHDPI_DISABLED, b"1")

    window = SDL_CreateWindow(window_name.encode('utf-8'),
                              SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
                              width, height,
                              SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE)

    if window is None:
        print("Error: Window could not be created! SDL Error: " + SDL_GetError())
        exit(1)

    gl_context = SDL_GL_CreateContext(window)
    if gl_context is None:
        print("Error: Cannot create OpenGL Context! SDL Error: " + SDL_GetError())
        exit(1)

    SDL_GL_MakeCurrent(window, gl_context)
    if SDL_GL_SetSwapInterval(1) < 0:
        print("Warning: Unable to set VSync! SDL Error: " + SDL_GetError())
        exit(1)

    return window, gl_context

if __name__ == "__main__":
    main()