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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `widgetry/src/backend_glow_native.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>backend_glow_native.rs - source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings" ></script><script src="../../storage.js"></script><script src="../../crates.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">☰</div><a href='../../widgetry/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../../brush.svg"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../../wheel.svg"></a></div></form></nav><section id="main" class="content"><div class="example-wrap"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">abstutil::Timer</span>;
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<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::backend_glow</span>::{<span class="ident">build_program</span>, <span class="ident">GfxCtxInnards</span>, <span class="ident">PrerenderInnards</span>, <span class="ident">SpriteTexture</span>};
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<span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">ScreenDims</span>, <span class="ident">Settings</span>};
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<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">setup</span>(
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<span class="ident">settings</span>: <span class="kw-2">&</span><span class="ident">Settings</span>,
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<span class="ident">timer</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Timer</span>,
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) <span class="op">-</span><span class="op">></span> (<span class="ident">PrerenderInnards</span>, <span class="ident">winit::event_loop::EventLoop</span><span class="op"><</span>()<span class="op">></span>) {
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<span class="kw">let</span> <span class="ident">event_loop</span> <span class="op">=</span> <span class="ident">winit::event_loop::EventLoop::new</span>();
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<span class="kw">let</span> <span class="ident">window</span> <span class="op">=</span> <span class="ident">winit::window::WindowBuilder::new</span>()
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.<span class="ident">with_title</span>(<span class="kw-2">&</span><span class="ident">settings</span>.<span class="ident">window_title</span>)
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.<span class="ident">with_maximized</span>(<span class="bool-val">true</span>);
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<span class="comment">// TODO If people are hitting problems with context not matching what their GPU provides, dig up</span>
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<span class="comment">// backend_glium.rs from git and bring the fallback behavior here. (Ideally, there'd be</span>
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<span class="comment">// something in glutin to directly express this.)</span>
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<span class="kw">let</span> <span class="ident">context</span> <span class="op">=</span> <span class="ident">glutin::ContextBuilder::new</span>()
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<span class="comment">// 2 looks really bad, 4 looks alright. For thin lines at low zoom, 8 looks better, and</span>
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<span class="comment">// should have common videocard support.</span>
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.<span class="ident">with_multisampling</span>(<span class="number">8</span>)
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.<span class="ident">with_depth_buffer</span>(<span class="number">2</span>)
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.<span class="ident">build_windowed</span>(<span class="ident">window</span>.<span class="ident">clone</span>(), <span class="kw-2">&</span><span class="ident">event_loop</span>)
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.<span class="ident">or_else</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> {
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<span class="macro">warn!</span>(<span class="string">"Trying default graphics context after standard graphics context failed with error: {:?}"</span>, <span class="ident">err</span>);
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<span class="ident">glutin::ContextBuilder::new</span>().<span class="ident">build_windowed</span>(<span class="ident">window</span>.<span class="ident">clone</span>(), <span class="kw-2">&</span><span class="ident">event_loop</span>)
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})
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.<span class="ident">or_else</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> {
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<span class="macro">warn!</span>(<span class="string">"Trying graphics context with vsync after default graphics context failed with error: {:?}"</span>, <span class="ident">err</span>);
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<span class="ident">glutin::ContextBuilder::new</span>()
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.<span class="ident">with_vsync</span>(<span class="bool-val">true</span>)
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.<span class="ident">build_windowed</span>(<span class="ident">window</span>.<span class="ident">clone</span>(), <span class="kw-2">&</span><span class="ident">event_loop</span>)
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}).<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> {
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<span class="macro">panic!</span>(<span class="string">"Your videocard doesn't support the OpenGL mode requested. This is a common issue when running inside a virtual machine; please run natively if possible. See https://github.com/a-b-street/abstreet/issues/103 for more info, and feel free to ask for help using that issue.\n\nError: {:?}"</span>, <span class="ident">err</span>);
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});
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<span class="kw">let</span> <span class="ident">windowed_context</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">context</span>.<span class="ident">make_current</span>().<span class="ident">unwrap</span>() };
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<span class="kw">let</span> <span class="ident">gl</span> <span class="op">=</span> <span class="kw">unsafe</span> {
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<span class="ident">glow::Context::from_loader_function</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="ident">windowed_context</span>.<span class="ident">get_proc_address</span>(<span class="ident">s</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw">_</span>)
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};
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<span class="kw">let</span> <span class="ident">program</span> <span class="op">=</span> <span class="kw">unsafe</span> {
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<span class="ident">build_program</span>(
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<span class="kw-2">&</span><span class="ident">gl</span>,
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<span class="macro">include_str!</span>(<span class="string">"../shaders/vertex_140.glsl"</span>),
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<span class="macro">include_str!</span>(<span class="string">"../shaders/fragment_140.glsl"</span>),
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)
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.<span class="ident">or_else</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> {
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<span class="macro">warn!</span>(
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<span class="string">"unable to build program with default shaderrs, falling back to v300. error: {:?}"</span>,
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<span class="ident">err</span>
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);
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<span class="ident">build_program</span>(
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<span class="kw-2">&</span><span class="ident">gl</span>,
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<span class="macro">include_str!</span>(<span class="string">"../shaders/vertex_300.glsl"</span>),
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<span class="macro">include_str!</span>(<span class="string">"../shaders/fragment_300.glsl"</span>),
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)
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})
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.<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> {
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<span class="macro">panic!</span>(<span class="string">"error building program: {:?}"</span>, <span class="ident">err</span>);
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})
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};
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<span class="ident">timer</span>.<span class="ident">start</span>(<span class="string">"load textures"</span>);
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<span class="kw">let</span> <span class="ident">sprite_texture</span> <span class="op">=</span> <span class="ident">SpriteTexture::new</span>(
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<span class="macro">include_bytes!</span>(<span class="string">"../textures/spritesheet.png"</span>).<span class="ident">to_vec</span>(),
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<span class="number">64</span>,
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<span class="number">64</span>,
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)
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.<span class="ident">expect</span>(<span class="string">"failed to format texture sprite sheet"</span>);
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<span class="ident">sprite_texture</span>
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.<span class="ident">upload_gl2</span>(<span class="kw-2">&</span><span class="ident">gl</span>)
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.<span class="ident">expect</span>(<span class="string">"failed to upload textures"</span>);
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<span class="ident">timer</span>.<span class="ident">stop</span>(<span class="string">"load textures"</span>);
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(
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<span class="ident">PrerenderInnards::new</span>(<span class="ident">gl</span>, <span class="ident">program</span>, <span class="prelude-val">Some</span>(<span class="ident">WindowAdapter</span>(<span class="ident">windowed_context</span>))),
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<span class="ident">event_loop</span>,
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)
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}
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<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">WindowAdapter</span>(<span class="ident">glutin::WindowedContext</span><span class="op"><</span><span class="ident">glutin::PossiblyCurrent</span><span class="op">></span>);
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<span class="kw">impl</span> <span class="ident">WindowAdapter</span> {
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<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">window</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="ident">winit::window::Window</span> {
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<span class="self">self</span>.<span class="number">0</span>.<span class="ident">window</span>()
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}
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<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">window_resized</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">new_size</span>: <span class="ident">ScreenDims</span>, <span class="ident">scale_factor</span>: <span class="ident">f64</span>) {
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<span class="kw">let</span> <span class="ident">physical_size</span> <span class="op">=</span> <span class="ident">winit::dpi::LogicalSize::from</span>(<span class="ident">new_size</span>).<span class="ident">to_physical</span>(<span class="ident">scale_factor</span>);
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<span class="self">self</span>.<span class="number">0</span>.<span class="ident">resize</span>(<span class="ident">physical_size</span>);
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}
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<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">draw_finished</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">_gfc_ctx_innards</span>: <span class="ident">GfxCtxInnards</span>) {
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<span class="self">self</span>.<span class="number">0</span>.<span class="ident">swap_buffers</span>().<span class="ident">unwrap</span>();
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}
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}
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</code></pre></div>
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