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A feeble attempt to overcome flickering issues on window resize.

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It really seems insurmountable at this point.  Not sure what SDL is doing
that's causing this.  But I'm leaving this code in, because it makes
things a little cleaner and serves as a good example to myself for how
to render to textures.
This commit is contained in:
Nathan Vegdahl 2015-01-20 21:55:11 -08:00
parent 6c6e8896a1
commit ea6d1c56d1
2 changed files with 71 additions and 8 deletions
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3
src/font.rs
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@ -7,12 +7,13 @@ use freetype;
use sdl2;
use sdl2::surface::Surface;
use sdl2::render::Texture;
use sdl2::rect::Rect;
use string_utils::{is_line_ending};
struct CachedGlyph {
texture: Option<sdl2::render::Texture>,
texture: Option<Texture>,
height: i32,
width: i32,
advance: i32,

78
src/gui/mod.rs
View File

@ -1,13 +1,19 @@
#![allow(dead_code)]
use std::cmp::min;
use sdl2;
use sdl2::event::WindowEventId;
use sdl2::render::{Renderer, Texture};
use sdl2::rect::Rect;
use font::Font;
use editor::Editor;
pub struct GUI {
renderer: sdl2::render::Renderer,
renderer: Renderer,
draw_buf: Texture,
font: Font,
editor: Editor,
}
@ -19,12 +25,15 @@ impl GUI {
// Get the window and renderer for sdl
let window = sdl2::video::Window::new("Led Editor", sdl2::video::WindowPos::PosCentered, sdl2::video::WindowPos::PosCentered, 800, 600, sdl2::video::OPENGL | sdl2::video::RESIZABLE).unwrap();
let renderer = sdl2::render::Renderer::from_window(window, sdl2::render::RenderDriverIndex::Auto, sdl2::render::ACCELERATED).unwrap();
let (w, h) = renderer.get_output_size().unwrap();
let draw_buf = renderer.create_texture(sdl2::pixels::PixelFormatFlag::RGBA8888, sdl2::render::TextureAccess::Target, w, h).unwrap();
let mut editor = Editor::new();
editor.update_dim(renderer.get_output_size().unwrap().1 as usize, renderer.get_output_size().unwrap().0 as usize);
GUI {
renderer: renderer,
draw_buf: draw_buf,
font: font,
editor: editor,
}
@ -37,12 +46,15 @@ impl GUI {
// Get the window and renderer for sdl
let window = sdl2::video::Window::new("Led Editor", sdl2::video::WindowPos::PosCentered, sdl2::video::WindowPos::PosCentered, 800, 600, sdl2::video::OPENGL | sdl2::video::RESIZABLE).unwrap();
let renderer = sdl2::render::Renderer::from_window(window, sdl2::render::RenderDriverIndex::Auto, sdl2::render::ACCELERATED).unwrap();
let (w, h) = renderer.get_output_size().unwrap();
let draw_buf = renderer.create_texture(sdl2::pixels::PixelFormatFlag::RGBA8888, sdl2::render::TextureAccess::Target, w, h).unwrap();
let mut editor = ed;
editor.update_dim(renderer.get_output_size().unwrap().1 as usize, renderer.get_output_size().unwrap().0 as usize);
GUI {
renderer: renderer,
draw_buf: draw_buf,
font: font,
editor: editor,
}
@ -55,16 +67,57 @@ impl GUI {
sdl2::event::Event::Quit(_) => break,
sdl2::event::Event::KeyDown(_, _, key, _, _, _) => {
if key == sdl2::keycode::KeyCode::Escape {
break
break;
}
},
sdl2::event::Event::Window(_, _, sdl2::event::WindowEventId::Exposed, _, _) => {
let _ = self.renderer.set_draw_color(sdl2::pixels::Color::RGB(240, 240, 240));
let _ = self.renderer.clear();
//self.font.draw_text("Hi there! (How's it going???) { let b = 42; }", (0, 0, 0), 50, 50, &self.renderer);
self.draw_editor_text((50, 50), (300, 300));
sdl2::event::Event::Window(_, _, WindowEventId::Exposed, _, _) => {
// Remove other Exposed events from the queue, to avoid
// clogging things up.
sdl2::event::filter_events(filter_window_expose);
// Get renderer size
let (w, h) = self.renderer.get_output_size().unwrap();
// Display last rendered contents to fill things in quickly
match self.draw_buf.query() {
Ok(tq) => {
let wm = min(w, tq.width) as i32;
let hm = min(h, tq.height) as i32;
let _ = self.renderer.copy(&self.draw_buf, Some(Rect{x:0, y:0, h:hm, w:wm}), Some(Rect{x:0, y:0, h:hm, w:wm}));
self.renderer.present();
},
_ => {
}
}
// Make sure the texture still matches the render size
match self.draw_buf.query() {
Ok(tq) => {
if tq.width != w || tq.height != h {
self.draw_buf = self.renderer.create_texture(sdl2::pixels::PixelFormatFlag::RGBA8888, sdl2::render::TextureAccess::Target, w, h).unwrap();
}
},
_ => {
self.draw_buf = self.renderer.create_texture(sdl2::pixels::PixelFormatFlag::RGBA8888, sdl2::render::TextureAccess::Target, w, h).unwrap();
}
}
// Draw UI to texture
let _ = self.renderer.set_render_target(Some(&self.draw_buf));
let _ = self.renderer.set_draw_color(sdl2::pixels::Color::RGB(80, 80, 80));
let _ = self.renderer.clear();
self.draw_editor_text((50, 50), (300, 300));
// Copy texture over
let _ = self.renderer.set_render_target(None);
let _ = self.renderer.copy(&self.draw_buf, Some(Rect{x:0, y:0, h:h as i32, w:w as i32}), Some(Rect{x:0, y:0, h:h as i32, w:w as i32}));
self.renderer.present();
},
_ => {}
}
}
@ -79,7 +132,7 @@ impl GUI {
for line in line_iter {
for g in line.grapheme_iter() {
x += self.font.draw_text(g, (0, 0, 0), x as i32, y as i32, &self.renderer);
x += self.font.draw_text(g, (255, 255, 255), x as i32, y as i32, &self.renderer);
}
x = c1.1;
@ -87,3 +140,12 @@ impl GUI {
}
}
}
// Used for removing WindowEventId::Exposed events from the queue
extern "C" fn filter_window_expose(e: sdl2::event::Event) -> bool {
match e {
sdl2::event::Event::Window(_, _, WindowEventId::Exposed, _, _) => false,
_ => true,
}
}