Struct webgl2_glyph::TextRenderer

pub struct TextRenderer { /* fields omitted */ }

Glyph renderer for WebGL2.

Example usage:

use wasm_bindgen::JsCast;
use web_sys::WebGl2RenderingContext;
use webgl2_glyph::{TextRenderer, glyph_brush::{FontArc, Section, Text}};

let document = web_sys::window().unwrap().document().unwrap();
let canvas = document.get_element_by_id("canvas").unwrap();
let canvas: web_sys::HtmlCanvasElement =
canvas.dyn_into::<web_sys::HtmlCanvasElement>().unwrap();

let gl = canvas
    .get_context("webgl2")
    .unwrap()
    .unwrap()
    .dyn_into::<WebGl2RenderingContext>()
    .unwrap();

let font =
    FontArc::try_from_slice(include_bytes!("../demos/SourceSansPro-Regular.ttf")).unwrap();
let mut renderer = TextRenderer::try_new(&gl, font).unwrap();

renderer.glyph_brush().queue(
    Section::default()
        .add_text(Text::new("Hello world").with_scale(50.))
        .with_screen_position((30., 30.)),
);

renderer.render().unwrap();

Implementations

impl TextRenderer

pub fn glyph_brush(&mut self) -> &mut GlyphBrush<QuadData>

Returns a mutable reference to the renderer’s internal GlyphBrush instance. This can be used to add text to the queue.

pub fn try_new(
    gl: Rc<WebGl2RenderingContext>,
    font: FontArc
) -> Result<Self, Box<dyn Error>>

Construct a new instance for rendering text in the given font to the given WebGL2 rendering context.

pub fn render(&mut self) -> Result<(), Box<dyn Error>>

Render the queued text. Should be called from a request_animation_frame callback. Rendering clears the draw queue.