Gered
73e5b9c7bc
this is based off what i saw some other libraries doing. i'm not sure what is the "best practice" to be honest, but i definitely like this. especially the prelude is now much simpler, which is nice.
212 lines
7.8 KiB
Rust
212 lines
7.8 KiB
Rust
use std::time::Instant;
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use ggdt::graphics::RgbaBitmap;
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use ggdt::system::{KeyModifiers, KeyboardEvent, MouseButton, MouseEvent, Scancode, SystemEvent};
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fn handle_key(io: &mut imgui::Io, key: Scancode, down: bool) {
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let key = match key {
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Scancode::A => imgui::Key::A,
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Scancode::B => imgui::Key::B,
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Scancode::C => imgui::Key::C,
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Scancode::D => imgui::Key::D,
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Scancode::E => imgui::Key::E,
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Scancode::F => imgui::Key::F,
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Scancode::G => imgui::Key::G,
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Scancode::H => imgui::Key::H,
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Scancode::I => imgui::Key::I,
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Scancode::J => imgui::Key::J,
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Scancode::K => imgui::Key::K,
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Scancode::L => imgui::Key::L,
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Scancode::M => imgui::Key::M,
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Scancode::N => imgui::Key::N,
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Scancode::O => imgui::Key::O,
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Scancode::P => imgui::Key::P,
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Scancode::Q => imgui::Key::Q,
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Scancode::R => imgui::Key::R,
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Scancode::S => imgui::Key::S,
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Scancode::T => imgui::Key::T,
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Scancode::U => imgui::Key::U,
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Scancode::V => imgui::Key::V,
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Scancode::W => imgui::Key::W,
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Scancode::X => imgui::Key::X,
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Scancode::Y => imgui::Key::Y,
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Scancode::Z => imgui::Key::Z,
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Scancode::Num1 => imgui::Key::Keypad1,
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Scancode::Num2 => imgui::Key::Keypad2,
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Scancode::Num3 => imgui::Key::Keypad3,
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Scancode::Num4 => imgui::Key::Keypad4,
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Scancode::Num5 => imgui::Key::Keypad5,
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Scancode::Num6 => imgui::Key::Keypad6,
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Scancode::Num7 => imgui::Key::Keypad7,
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Scancode::Num8 => imgui::Key::Keypad8,
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Scancode::Num9 => imgui::Key::Keypad9,
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Scancode::Num0 => imgui::Key::Keypad0,
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Scancode::Return => imgui::Key::Enter,
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Scancode::Escape => imgui::Key::Escape,
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Scancode::Backspace => imgui::Key::Backspace,
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Scancode::Tab => imgui::Key::Tab,
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Scancode::Space => imgui::Key::Space,
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Scancode::Minus => imgui::Key::Minus,
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Scancode::Equals => imgui::Key::Equal,
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Scancode::LeftBracket => imgui::Key::LeftBracket,
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Scancode::RightBracket => imgui::Key::RightBracket,
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Scancode::Backslash => imgui::Key::Backslash,
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Scancode::Semicolon => imgui::Key::Semicolon,
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Scancode::Apostrophe => imgui::Key::Apostrophe,
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Scancode::Grave => imgui::Key::GraveAccent,
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Scancode::Comma => imgui::Key::Comma,
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Scancode::Period => imgui::Key::Period,
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Scancode::Slash => imgui::Key::Slash,
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Scancode::CapsLock => imgui::Key::CapsLock,
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Scancode::F1 => imgui::Key::F1,
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Scancode::F2 => imgui::Key::F2,
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Scancode::F3 => imgui::Key::F3,
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Scancode::F4 => imgui::Key::F4,
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Scancode::F5 => imgui::Key::F5,
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Scancode::F6 => imgui::Key::F6,
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Scancode::F7 => imgui::Key::F7,
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Scancode::F8 => imgui::Key::F8,
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Scancode::F9 => imgui::Key::F9,
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Scancode::F10 => imgui::Key::F10,
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Scancode::F11 => imgui::Key::F11,
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Scancode::F12 => imgui::Key::F12,
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Scancode::PrintScreen => imgui::Key::PrintScreen,
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Scancode::ScrollLock => imgui::Key::ScrollLock,
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Scancode::Pause => imgui::Key::Pause,
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Scancode::Insert => imgui::Key::Insert,
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Scancode::Home => imgui::Key::Home,
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Scancode::PageUp => imgui::Key::PageUp,
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Scancode::Delete => imgui::Key::Delete,
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Scancode::End => imgui::Key::End,
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Scancode::PageDown => imgui::Key::PageDown,
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Scancode::Right => imgui::Key::RightArrow,
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Scancode::Left => imgui::Key::LeftArrow,
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Scancode::Down => imgui::Key::DownArrow,
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Scancode::Up => imgui::Key::UpArrow,
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Scancode::KpDivide => imgui::Key::KeypadDivide,
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Scancode::KpMultiply => imgui::Key::KeypadMultiply,
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Scancode::KpMinus => imgui::Key::KeypadSubtract,
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Scancode::KpPlus => imgui::Key::KeypadAdd,
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Scancode::KpEnter => imgui::Key::KeypadEnter,
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Scancode::Kp1 => imgui::Key::Keypad1,
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Scancode::Kp2 => imgui::Key::Keypad2,
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Scancode::Kp3 => imgui::Key::Keypad3,
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Scancode::Kp4 => imgui::Key::Keypad4,
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Scancode::Kp5 => imgui::Key::Keypad5,
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Scancode::Kp6 => imgui::Key::Keypad6,
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Scancode::Kp7 => imgui::Key::Keypad7,
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Scancode::Kp8 => imgui::Key::Keypad8,
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Scancode::Kp9 => imgui::Key::Keypad9,
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Scancode::Kp0 => imgui::Key::Keypad0,
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Scancode::KpPeriod => imgui::Key::KeypadDecimal,
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Scancode::Application => imgui::Key::Menu,
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Scancode::KpEquals => imgui::Key::KeypadEqual,
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Scancode::Menu => imgui::Key::Menu,
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Scancode::LCtrl => imgui::Key::LeftCtrl,
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Scancode::LShift => imgui::Key::LeftShift,
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Scancode::LAlt => imgui::Key::LeftAlt,
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Scancode::LGui => imgui::Key::LeftSuper,
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Scancode::RCtrl => imgui::Key::RightCtrl,
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Scancode::RShift => imgui::Key::RightShift,
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Scancode::RAlt => imgui::Key::RightAlt,
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Scancode::RGui => imgui::Key::RightSuper,
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_ => return,
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};
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io.add_key_event(key, down);
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}
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fn handle_key_modifier(io: &mut imgui::Io, keymod: KeyModifiers) {
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io.add_key_event(imgui::Key::ModShift, keymod.intersects(KeyModifiers::LSHIFTMOD | KeyModifiers::RSHIFTMOD));
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io.add_key_event(imgui::Key::ModCtrl, keymod.intersects(KeyModifiers::LCTRLMOD | KeyModifiers::RCTRLMOD));
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io.add_key_event(imgui::Key::ModAlt, keymod.intersects(KeyModifiers::LALTMOD | KeyModifiers::RALTMOD));
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io.add_key_event(imgui::Key::ModSuper, keymod.intersects(KeyModifiers::LGUIMOD | KeyModifiers::RGUIMOD));
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}
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fn handle_mouse_button_event(io: &mut imgui::Io, button: MouseButton, down: bool) {
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match button {
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MouseButton::Left => io.add_mouse_button_event(imgui::MouseButton::Left, down),
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MouseButton::Right => io.add_mouse_button_event(imgui::MouseButton::Right, down),
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MouseButton::Middle => io.add_mouse_button_event(imgui::MouseButton::Middle, down),
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MouseButton::X1 => io.add_mouse_button_event(imgui::MouseButton::Extra1, down),
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MouseButton::X2 => io.add_mouse_button_event(imgui::MouseButton::Extra2, down),
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_ => {}
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}
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}
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#[derive(Debug)]
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pub struct Platform {
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last_frame: Instant,
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}
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impl Platform {
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pub fn new(imgui: &mut imgui::Context) -> Self {
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imgui.set_ini_filename(None);
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imgui.set_platform_name(Some(String::from("ggdt")));
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// most of these rounding values default to 0.0 anyway, but explicitly defaulting them all to 0.0 for us
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// purely just to simplify the geometry. our triangle renderer isn't some super powerhouse after all ;-)
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imgui.style_mut().tab_rounding = 0.0;
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imgui.style_mut().grab_rounding = 0.0;
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imgui.style_mut().scrollbar_rounding = 0.0;
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imgui.style_mut().frame_rounding = 0.0;
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imgui.style_mut().popup_rounding = 0.0;
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imgui.style_mut().window_rounding = 0.0;
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imgui.style_mut().child_rounding = 0.0;
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// these cause some visible issues in window bordering rendering (maybe other places too).
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// TODO: investigate this more. my best guess is this is a problem with texture/bitmap sampling in
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// the current texture_2d implementation...
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imgui.style_mut().anti_aliased_lines = false;
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imgui.style_mut().anti_aliased_lines_use_tex = false;
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Platform { last_frame: Instant::now() }
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}
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pub fn handle_event(&mut self, context: &mut imgui::Context, event: &SystemEvent) -> bool {
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let io = context.io_mut();
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match *event {
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SystemEvent::Mouse(MouseEvent::MouseMotion { x, y, .. }) => {
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io.add_mouse_pos_event([x as f32, y as f32]);
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true
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}
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SystemEvent::Mouse(MouseEvent::MouseButtonUp { button, .. }) => {
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handle_mouse_button_event(io, button, false);
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true
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}
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SystemEvent::Mouse(MouseEvent::MouseButtonDown { button, .. }) => {
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handle_mouse_button_event(io, button, true);
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true
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}
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SystemEvent::Keyboard(KeyboardEvent::KeyUp { scancode: Some(scancode), keymod, .. }) => {
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handle_key_modifier(io, keymod);
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handle_key(io, scancode, false);
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true
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}
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SystemEvent::Keyboard(KeyboardEvent::KeyDown { scancode: Some(scancode), keymod, .. }) => {
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handle_key_modifier(io, keymod);
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handle_key(io, scancode, true);
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true
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}
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SystemEvent::Keyboard(KeyboardEvent::TextInput { ref text }) => {
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for ch in text.chars() {
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io.add_input_character(ch);
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}
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true
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}
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_ => false,
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}
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}
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pub fn prepare_frame(&mut self, context: &mut imgui::Context, dest: &RgbaBitmap) {
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let io = context.io_mut();
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let now = Instant::now();
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io.update_delta_time(now.duration_since(self.last_frame));
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self.last_frame = now;
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io.display_size = [dest.width() as f32, dest.height() as f32];
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io.display_framebuffer_scale = [1.0, 1.0];
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}
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}
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