From 703087fd88601d997a822ce550686f02e7aec89b Mon Sep 17 00:00:00 2001
From: Keith Simmons <keith@the-simmons.net>
Date: Tue, 4 Feb 2020 20:46:46 -0800
Subject: [PATCH] set buffer frames to 1 and add extra buffer startup command.
 Fix bug where mouse position is improperly scaled

---
 .gitignore              |  1 +
 src/main.rs             |  3 +++
 src/redraw_scheduler.rs |  7 ++++---
 src/settings.rs         | 18 ++++++++++++++----
 src/window.rs           |  3 ++-
 5 files changed, 24 insertions(+), 8 deletions(-)

diff --git a/.gitignore b/.gitignore
index 53eaa21..cce2d15 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 /target
 **/*.rs.bk
+*.log
diff --git a/src/main.rs b/src/main.rs
index 13a9528..c6eef01 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -35,6 +35,9 @@ fn main() {
         } else if arg == "--noIdle" {
             SETTINGS.no_idle.store(true, Ordering::Relaxed);
             false
+        } else if arg == "--extraBufferFrames" {
+            SETTINGS.buffer_frames.store(60, Ordering::Relaxed);
+            false
         } else {
             true
         }
diff --git a/src/redraw_scheduler.rs b/src/redraw_scheduler.rs
index 70d1d0c..8ca30e7 100644
--- a/src/redraw_scheduler.rs
+++ b/src/redraw_scheduler.rs
@@ -4,12 +4,12 @@ use std::time::Instant;
 
 use log::trace;
 
+use crate::settings::SETTINGS;
+
 lazy_static! {
     pub static ref REDRAW_SCHEDULER: RedrawScheduler = RedrawScheduler::new();
 }
 
-const BUFFER_FRAMES: u16 = 60;
-
 pub struct RedrawScheduler {
     frames_queued: AtomicU16,
     scheduled_frame: Mutex<Option<Instant>>
@@ -38,7 +38,8 @@ impl RedrawScheduler {
 
     pub fn queue_next_frame(&self) {
         trace!("Next frame queued");
-        self.frames_queued.store(BUFFER_FRAMES, Ordering::Relaxed);
+        let buffer_frames = SETTINGS.buffer_frames.load(Ordering::Relaxed);
+        self.frames_queued.store(buffer_frames, Ordering::Relaxed);
     }
 
     pub fn should_draw(&self) -> bool {
diff --git a/src/settings.rs b/src/settings.rs
index 6717b6a..d79717f 100644
--- a/src/settings.rs
+++ b/src/settings.rs
@@ -1,13 +1,23 @@
-use std::sync::atomic::AtomicBool;
+use std::sync::atomic::{AtomicBool, AtomicU16};
 
 use crossbeam::atomic::AtomicCell;
 
 lazy_static! {
-    pub static ref SETTINGS: Settings = Settings::default();
+    pub static ref SETTINGS: Settings = Settings::new();
 }
 
-#[derive(Default)]
 pub struct Settings {
     pub neovim_arguments: AtomicCell<Option<Vec<String>>>,
-    pub no_idle: AtomicBool
+    pub no_idle: AtomicBool,
+    pub buffer_frames: AtomicU16
+}
+
+impl Settings {
+    pub fn new() -> Settings {
+        Settings {
+            neovim_arguments: AtomicCell::new(None),
+            no_idle: AtomicBool::new(false),
+            buffer_frames: AtomicU16::new(1),
+        }
+    }
 }
diff --git a/src/window.rs b/src/window.rs
index a858f19..ac30734 100644
--- a/src/window.rs
+++ b/src/window.rs
@@ -4,7 +4,7 @@ use std::time::{Duration, Instant};
 
 use image::{load_from_memory, GenericImageView, Pixel};
 use skulpin::{CoordinateSystem, RendererBuilder, PresentMode};
-use skulpin::winit::dpi::LogicalSize;
+use skulpin::winit::dpi::{LogicalSize, LogicalPosition};
 use skulpin::winit::event::{ElementState, Event, MouseScrollDelta, StartCause, WindowEvent, ModifiersState};
 use skulpin::winit::event_loop::{ControlFlow, EventLoop};
 use skulpin::winit::window::{Icon, WindowBuilder};
@@ -138,6 +138,7 @@ pub fn ui_loop() {
                 },
                 ..
             } => {
+                let position: LogicalPosition<f64> = position.to_logical(window.scale_factor());
                 let grid_y = (position.x / renderer.font_width as f64) as i64;
                 let grid_x = (position.y / renderer.font_height as f64) as i64;
                 let (old_x, old_y) = mouse_pos;