opengl monitor

Cargo.toml

@@ -24,6 +24,11 @@ quadtree_rs = "0.1.2"
 proj-sys = "0.23.1"
 glib-macros = "0.17.10"
 svg = "0.13.1"
+libloading = "0.8.0"
+glue = "0.8.7"
+epoxy = "0.1.0"
+femtovg = "0.7.1"
+glow = "0.12.2"
 
 
 [build-dependencies]

_build.rs

@@ -2,6 +2,6 @@ fn main() {
     glib_build_tools::compile_resources(
         &["src/resources"],
         "src/resources/resources.gresource.xml",
-        "window.gresource",
+        "monitor.gresource",
     );
-}
+}

src/data/mod.rs

@@ -193,20 +193,6 @@ where
         });
         result
     }
-
-    pub fn dpi(&self, axis: Axis) {
-        match self.coord_type {
-            CoordType::LatLon => {
-                if axis == Axis::Asix0 {
-                    let mut new_dim1 = Array::zeros(self.dim1.raw_dim());
-                    let a = self.dim1.slice(s![0..3, ..]);
-                } else if axis == Axis::Asix1 {
-                } else {
-                }
-            }
-            _ => {}
-        }
-    }
 }
 
 #[inline]

src/main.rs

@@ -1,6 +1,4 @@
-use std::cell::RefCell;
-use std::rc::Rc;
-use std::time::Duration;
+use std::ptr;
 
 use glib::{timeout_add, timeout_add_local};
 use glib_macros::clone;
@@ -8,30 +6,48 @@ use gtk::gdk::builders::RGBABuilder;
 use gtk::gdk::Display;
 use gtk::{
     gio, glib, style_context_add_provider_for_display, Application, ApplicationWindow, CssProvider,
-    GestureDrag,
+    FontButton, GestureDrag,
 };
 use gtk::{prelude::*, DrawingArea};
 mod data;
+mod monitor;
 mod painter;
 mod render;
 mod tree;
 mod window;
 use data::{Npz, Radar2d, RadarData2d};
+use monitor::Monitor;
 use ndarray::parallel::prelude::{IntoParallelIterator, ParallelIterator};
-use num_traits::{FromPrimitive, Num};
 use painter::wgs84::{LatLonCoord, Mercator, ProjectionS, Range};
-use painter::{Coord, Painter};
-use svg::node::element::Rectangle;
+use render::Render;
+use render::{BackgroundConfig, BackgroundWidget};
 
 const APP_ID: &str = "org.gtk_rs.HelloWorld2";
 
 fn main() -> glib::ExitCode {
-    // gio::resources_register_include!("window.gresource").expect("Failed to register resources");
+    // Load GL pointers from epoxy (GL context management library used by GTK).
+    {
+        #[cfg(target_os = "macos")]
+        let library = unsafe { libloading::os::unix::Library::new("libepoxy.0.dylib") }.unwrap();
+        #[cfg(all(unix, not(target_os = "macos")))]
+        let library = unsafe { libloading::os::unix::Library::new("libepoxy.so.0") }.unwrap();
+        #[cfg(windows)]
+        let library = libloading::os::windows::Library::open_already_loaded("libepoxy-0.dll")
+            .or_else(|_| libloading::os::windows::Library::open_already_loaded("epoxy-0.dll"))
+            .unwrap();
+
+        epoxy::load_with(|name| {
+            unsafe { library.get::<_>(name.as_bytes()) }
+                .map(|symbol| *symbol)
+                .unwrap_or(ptr::null())
+        });
+    }
+
+    // gio::resources_register_include!("monitor.gresource").expect("Failed to register resources");
     // Create a new application
     let app = Application::builder().application_id(APP_ID).build();
     // Connect to "activate" signal of `app`
     app.connect_activate(build_ui);
-
     // Run the application
     app.run()
 }
@@ -43,19 +59,27 @@ fn build_ui(app: &Application) {
         .title("My GTK App")
         .build();
 
-    let drawing_area = DrawingArea::new();
-    let path = "/Users/ruomu/test2.npz";
+    let mut background_config = BackgroundConfig::new();
 
-    let data = Radar2d::<i8>::load(path, Npz).unwrap();
+    let background_widget = BackgroundWidget::new(background_config);
 
-    let projection = Mercator::new();
-    let aa = Range::from((*data.dim1.first().unwrap(), *data.dim1.last().unwrap()));
-    let ab = Range::from((*data.dim2.first().unwrap(), *data.dim2.last().unwrap()));
-    let coord = LatLonCoord::new(Some(aa), Some(ab), ((0, 1000), (0, 1000)), projection);
+    let drawing_area = Render::new();
 
-    let result = data.mapped(&coord);
+    // let path = "/Users/ruomu/test2.npz";
 
-    window.set_child(Some(&drawing_area));
+    // let data = Radar2d::<i8>::load(path, Npz).unwrap();
+    // let projection = Mercator::new();
+
+    // let aa = Range::from((*data.dim1.first().unwrap(), *data.dim1.last().unwrap()));
+    // let ab = Range::from((*data.dim2.first().unwrap(), *data.dim2.last().unwrap()));
+
+    // let coord = LatLonCoord::new(Some(aa), Some(ab), ((0, 1000), (0, 1000)), projection);
+
+    // let result = data.mapped(&coord);
+
+    let monitor = Monitor::new();
+
+    window.set_child(Some(&monitor));
     window.set_default_width(1000);
     window.set_default_height(800);
 

src/monitor/imp.rs

@@ -0,0 +1,34 @@
+use crate::render::Render;
+use glib::subclass::InitializingObject;
+use gtk::subclass::prelude::*;
+use gtk::CompositeTemplate;
+use gtk::{glib, prelude::WidgetExtManual};
+use std::cell::{Cell, RefCell};
+
+#[derive(Default, CompositeTemplate)]
+#[template(file = "monitor.ui")]
+pub struct Monitor {
+    #[template_child(id = "render")]
+    pub(super) label: TemplateChild<Render>,
+}
+
+#[glib::object_subclass]
+impl ObjectSubclass for Monitor {
+    const NAME: &'static str = "Monitor";
+    type Type = super::Monitor;
+    type ParentType = gtk::Box;
+
+    fn class_init(klass: &mut Self::Class) {
+        klass.bind_template();
+    }
+
+    fn instance_init(obj: &InitializingObject<Self>) {
+        obj.init_template();
+    }
+}
+
+impl ObjectImpl for Monitor {}
+
+impl WidgetImpl for Monitor {}
+
+impl BoxImpl for Monitor {}

src/monitor/mod.rs

@@ -0,0 +1,16 @@
+mod imp;
+use crate::render::Render;
+use glib::subclass::prelude::*;
+use gtk::traits::WidgetExt;
+
+glib::wrapper! {
+    pub struct Monitor(ObjectSubclass<imp::Monitor>)
+    @extends gtk::Box,gtk::Widget;
+}
+
+impl Monitor {
+    pub fn new() -> Self {
+        let this: Self = glib::Object::new();
+        this
+    }
+}

src/monitor/monitor.ui

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <template class="Monitor" parent="GtkBox">
+	<child>
+	 <object class="MyRender" id="render">
+	 	<property name="hexpand">True</property>
+	 </object>
+	</child>
+  </template>
+</interface>

src/painter/coords/wgs84.rs

@@ -9,6 +9,92 @@ type Lon = f64;
 #[derive(Clone, Copy)]
 pub struct Range(pub f64, pub f64);
 
+impl Range {
+    pub fn key_points(&self, max_points: usize) -> Vec<f64> {
+        if max_points == 0 {
+            return vec![];
+        }
+
+        let range = (self.0.min(self.1) as f64, self.1.max(self.0) as f64);
+        assert!(!(range.0.is_nan() || range.1.is_nan()));
+        if (range.0 - range.1).abs() < std::f64::EPSILON {
+            return vec![range.0 as f64];
+        }
+
+        let mut scale = (10f64).powf((range.1 - range.0).log(10.0).floor());
+        // The value granularity controls how we round the values.
+        // To avoid generating key points like 1.00000000001, we round to the nearest multiple of the
+        // value granularity.
+        // By default, we make the granularity as the 1/10 of the scale.
+        let mut value_granularity = scale / 10.0;
+        fn rem_euclid(a: f64, b: f64) -> f64 {
+            let ret = if b > 0.0 {
+                a - (a / b).floor() * b
+            } else {
+                a - (a / b).ceil() * b
+            };
+            if (ret - b).abs() < std::f64::EPSILON {
+                0.0
+            } else {
+                ret
+            }
+        }
+
+        // At this point we need to make sure that the loop invariant:
+        // The scale must yield number of points than requested
+        if 1 + ((range.1 - range.0) / scale).floor() as usize > max_points {
+            scale *= 10.0;
+            value_granularity *= 10.0;
+        }
+
+        'outer: loop {
+            let old_scale = scale;
+            for nxt in [2.0, 5.0, 10.0].iter() {
+                let mut new_left = range.0 - rem_euclid(range.0, old_scale / nxt);
+                if new_left < range.0 {
+                    new_left += old_scale / nxt;
+                }
+                let new_right = range.1 - rem_euclid(range.1, old_scale / nxt);
+
+                let npoints = 1.0 + ((new_right - new_left) / old_scale * nxt);
+
+                if npoints.round() as usize > max_points {
+                    break 'outer;
+                }
+
+                scale = old_scale / nxt;
+            }
+            scale = old_scale / 10.0;
+            value_granularity /= 10.0;
+        }
+
+        let mut ret = vec![];
+        // In some extreme cases, left might be too big, so that (left + scale) - left == 0 due to
+        // floating point error.
+        // In this case, we may loop forever. To avoid this, we need to use two variables to store
+        // the current left value. So we need keep a left_base and a left_relative.
+        let left = {
+            let mut value = range.0 - rem_euclid(range.0, scale);
+            if value < range.0 {
+                value += scale;
+            }
+            value
+        };
+        let left_base = (left / value_granularity).floor() * value_granularity;
+        let mut left_relative = left - left_base;
+        let right = range.1 - rem_euclid(range.1, scale);
+        while (right - left_relative - left_base) >= -std::f64::EPSILON {
+            let new_left_relative = (left_relative / value_granularity).round() * value_granularity;
+            if new_left_relative < 0.0 {
+                left_relative += value_granularity;
+            }
+            ret.push((left_relative + left_base) as f64);
+            left_relative += scale;
+        }
+        return ret;
+    }
+}
+
 #[derive(Error, Debug)]
 pub enum CoordError {
     #[error("")]

src/render/background/imp.rs

@@ -0,0 +1,35 @@
+use std::cell::RefCell;
+
+use crate::render::{imp, WindowCoord};
+use femtovg::Paint;
+use geo_macros::Prj;
+use gtk::glib;
+use gtk::subclass::prelude::*;
+
+#[derive(Prj, Default)]
+pub struct BackgroundConfig {
+    pub show_lat_lines: bool,
+    pub show_lon_lines: bool,
+    pub lat_lines: Vec<Vec<WindowCoord>>,
+    pub lon_lines: Vec<Vec<WindowCoord>>,
+    pub painter: Paint,
+}
+
+impl BackgroundConfig {
+    pub fn new() -> Self {
+        Self::default()
+    }
+}
+
+#[derive(Default)]
+pub struct BackgroundWidget {
+    pub(super) config: RefCell<BackgroundConfig>,
+}
+
+#[glib::object_subclass]
+impl ObjectSubclass for BackgroundWidget {
+    const NAME: &'static str = "BackgroundWidget";
+    type Type = super::BackgroundWidget;
+}
+
+impl ObjectImpl for BackgroundWidget {}

src/render/background/mod.rs

@@ -0,0 +1,46 @@
+mod imp;
+use femtovg::{renderer::OpenGl, Canvas, Path};
+use glib::subclass::types::ObjectSubclassIsExt;
+use gtk::{ffi::gtk_widget_get_width, glib, graphene::Rect, prelude::SnapshotExtManual};
+use std::ops::Range;
+
+pub use self::imp::BackgroundConfig;
+
+glib::wrapper! {
+    pub struct BackgroundWidget(ObjectSubclass<imp::BackgroundWidget>);
+}
+
+impl Default for BackgroundWidget {
+    fn default() -> Self {
+        Self::new(BackgroundConfig::default())
+    }
+}
+
+impl BackgroundWidget {
+    pub fn new(config: BackgroundConfig) -> Self {
+        let this: Self = glib::Object::new();
+        let imp = this.imp();
+        imp.config.replace(config);
+        this
+    }
+
+    fn mesh_lines(&self, canvas: &mut Canvas<OpenGl>) {
+        let imp = self.imp();
+        let line_painter = &imp.config.borrow().painter;
+        if imp.config.borrow().show_lat_lines {
+            for lat_line in imp.config.borrow().lat_lines.iter() {
+                let mut path = Path::new();
+                lat_line.iter().for_each(|v| {
+                    let (x, y) = *v;
+                    path.move_to(x, y);
+                });
+                canvas.stroke_path(&mut path, line_painter);
+            }
+        }
+        if imp.config.borrow().show_lon_lines {}
+    }
+
+    pub fn draw(&self, canvas: &mut Canvas<OpenGl>) {
+        let imp = self.imp();
+    }
+}

src/render/imp.rs

@@ -1,30 +1,111 @@
+use super::background::BackgroundWidget;
 use glib::{ObjectExt, ParamSpec, Properties, Value};
-use gtk::glib;
 use gtk::subclass::prelude::*;
+use gtk::traits::{GLAreaExt, WidgetExt};
+use gtk::{glib, prelude::WidgetExtManual};
 use std::cell::{Cell, RefCell};
-
-use crate::data::Radar2d;
+use std::f32::consts::PI;
+use std::num::NonZeroU32;
 
 #[derive(Default)]
 pub struct Render {
-    data: RefCell<Option<Radar2d<i8>>>,
+    // pub(super) background: RefCell<BackgroundWidget>,
+    canvas: RefCell<Option<femtovg::Canvas<femtovg::renderer::OpenGl>>>,
 }
 
 #[glib::object_subclass]
 impl ObjectSubclass for Render {
     const NAME: &'static str = "MyRender";
     type Type = super::Render;
-    type ParentType = gtk::Widget;
+    type ParentType = gtk::GLArea;
 }
 
 // Trait shared by all GObjects
-impl ObjectImpl for Render {}
-
-// Trait shared by all widgets
-impl WidgetImpl for Render {
-    fn snapshot(&self, snapshot: &gtk::Snapshot) {
-        if let Some(data) = self.data.borrow_mut().take() {}
+impl ObjectImpl for Render {
+    fn constructed(&self) {
+        self.parent_constructed();
+        let area = self.obj();
+        area.set_has_stencil_buffer(true);
+        area.add_tick_callback(|area, _| {
+            area.queue_render();
+            glib::Continue(true)
+        });
     }
 }
 
-impl DrawingAreaImpl for Render {}
+// Trait shared by all widgets
+impl WidgetImpl for Render {}
+
+impl GLAreaImpl for Render {
+    fn resize(&self, width: i32, height: i32) {
+        self.ensure_canvas();
+        let mut canvas = self.canvas.borrow_mut();
+        let canvas = canvas.as_mut().unwrap();
+        canvas.set_size(
+            width as u32,
+            height as u32,
+            self.obj().scale_factor() as f32,
+        );
+    }
+
+    fn render(&self, context: &gtk::gdk::GLContext) -> bool {
+        use femtovg::{Color, Paint, Path};
+
+        self.ensure_canvas();
+        let mut canvas = self.canvas.borrow_mut();
+        let canvas = canvas.as_mut().unwrap();
+
+        let dpi = self.obj().scale_factor();
+        let w = self.obj().width();
+        let h = self.obj().width();
+
+        canvas.clear_rect(
+            0,
+            0,
+            (w * dpi) as u32,
+            (h * dpi) as u32,
+            Color::rgba(0, 0, 0, 255),
+        );
+        canvas.fill_text(
+            0.,
+            0.,
+            "hello",
+            &Paint::color(Color::rgba(255, 255, 255, 0)),
+        );
+
+        canvas.flush();
+
+        true
+    }
+}
+
+impl Render {
+    fn ensure_canvas(&self) {
+        use femtovg::{renderer, Canvas};
+        use glow::HasContext;
+
+        if self.canvas.borrow().is_some() {
+            return;
+        }
+        let widget = self.obj();
+        widget.attach_buffers();
+
+        static LOAD_FN: fn(&str) -> *const std::ffi::c_void =
+            |s| epoxy::get_proc_addr(s) as *const _;
+        // SAFETY: Need to get the framebuffer id that gtk expects us to draw into, so femtovg
+        // knows which framebuffer to bind. This is safe as long as we call attach_buffers
+        // beforehand. Also unbind it here just in case, since this can be called outside render.
+        let (mut renderer, fbo) = unsafe {
+            let renderer =
+                renderer::OpenGl::new_from_function(LOAD_FN).expect("Cannot create renderer");
+            let ctx = glow::Context::from_loader_function(LOAD_FN);
+            let id = NonZeroU32::new(ctx.get_parameter_i32(glow::DRAW_FRAMEBUFFER_BINDING) as u32)
+                .expect("No GTK provided framebuffer binding");
+            ctx.bind_framebuffer(glow::FRAMEBUFFER, None);
+            (renderer, glow::NativeFramebuffer(id))
+        };
+        renderer.set_screen_target(Some(fbo));
+        let canvas = Canvas::new(renderer).expect("Cannot create canvas");
+        self.canvas.replace(Some(canvas));
+    }
+}

src/render/mod.rs

@@ -1,9 +1,20 @@
+mod background;
 mod imp;
-use glib::Object;
-use gtk::glib;
+pub use self::background::{BackgroundConfig, BackgroundWidget};
+use glib::subclass::prelude::*;
+use gtk::{traits::GestureSingleExt, EventControllerScrollFlags};
+
+pub(super) type WindowCoord = (f32, f32);
 
 glib::wrapper! {
-    pub struct Render(ObjectSubclass<imp::Render>) @extends gtk::Widget;
+    pub struct Render(ObjectSubclass<imp::Render>)
+    @extends gtk::GLArea, gtk::Widget;
+}
+
+impl Default for Render {
+    fn default() -> Self {
+        Self::new()
+    }
 }
 
 impl Render {

src/resources/resources.gresource.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <gresources>
   <gresource prefix="/org/cinrad_g/">
-    <file compressed="true" preprocess="xml-stripblanks">window.ui</file>
+    <file compressed="true" preprocess="xml-stripblanks">monitor.ui</file>
   </gresource>
 </gresources>

src/resources/window.ui

@@ -1,15 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<interface>
-  <template class="MyGtkAppWindow" parent="GtkApplicationWindow">
-    <property name="title">My GTK App</property>
-    <child>
-      <object class="GtkButton" id="button">
-        <property name="label">Press me!</property>
-        <property name="margin-top">12</property>
-        <property name="margin-bottom">12</property>
-        <property name="margin-start">12</property>
-        <property name="margin-end">12</property>  
-      </object>
-    </child>
-  </template>
-</interface>