93 lines
2.6 KiB
Rust
93 lines
2.6 KiB
Rust
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use glow::HasContext;
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use imgui::Context;
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use imgui_glow_renderer::AutoRenderer;
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use imgui_sdl2_support::SdlPlatform;
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use sdl2::{
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event::Event,
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video::{GLProfile, Window},
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};
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// Create a new glow context.
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fn glow_context(window: &Window) -> glow::Context {
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unsafe {
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glow::Context::from_loader_function(|s| window.subsystem().gl_get_proc_address(s) as _)
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}
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}
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fn main() {
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/* initialize SDL and its video subsystem */
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let sdl = sdl2::init().unwrap();
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let video_subsystem = sdl.video().unwrap();
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/* hint SDL to initialize an OpenGL 3.3 core profile context */
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let gl_attr = video_subsystem.gl_attr();
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gl_attr.set_context_version(3, 3);
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gl_attr.set_context_profile(GLProfile::Core);
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/* create a new window, be sure to call opengl method on the builder when using glow! */
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let window = video_subsystem
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.window("Hello imgui-rs!", 1280, 720)
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.allow_highdpi()
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.opengl()
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.position_centered()
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.resizable()
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.build()
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.unwrap();
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/* create a new OpenGL context and make it current */
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let gl_context = window.gl_create_context().unwrap();
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window.gl_make_current(&gl_context).unwrap();
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/* enable vsync to cap framerate */
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window.subsystem().gl_set_swap_interval(1).unwrap();
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/* create new glow and imgui contexts */
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let gl = glow_context(&window);
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/* create context */
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let mut imgui = Context::create();
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/* disable creation of files on disc */
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imgui.set_ini_filename(None);
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imgui.set_log_filename(None);
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/* setup platform and renderer, and fonts to imgui */
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imgui
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.fonts()
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.add_font(&[imgui::FontSource::DefaultFontData { config: None }]);
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/* create platform and renderer */
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let mut platform = SdlPlatform::init(&mut imgui);
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let mut renderer = AutoRenderer::initialize(gl, &mut imgui).unwrap();
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/* start main loop */
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let mut event_pump = sdl.event_pump().unwrap();
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'main: loop {
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for event in event_pump.poll_iter() {
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/* pass all events to imgui platfrom */
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platform.handle_event(&mut imgui, &event);
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if let Event::Quit { .. } = event {
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break 'main;
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}
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}
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/* call prepare_frame before calling imgui.new_frame() */
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platform.prepare_frame(&mut imgui, &window, &event_pump);
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let ui = imgui.new_frame();
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/* create imgui UI here */
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ui.show_demo_window(&mut true);
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/* render */
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let draw_data = imgui.render();
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unsafe { renderer.gl_context().clear(glow::COLOR_BUFFER_BIT) };
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renderer.render(draw_data).unwrap();
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window.gl_swap_window();
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}
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}
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