gfx_glyph

Fast GPU cached text rendering using gfx-rs & rusttype.

Makes use of three kinds of caching to optimise frame performance.

• Caching of glyph positioning output to avoid repeated cost of identical text rendering on sequential frames.
• Caches draw calculations to avoid repeated cost of identical text rendering on sequential frames.
• GPU cache logic to dynamically maintain a GPU texture of rendered glyphs.

extern crate gfx_glyph;
use gfx_glyph::{Section, GlyphBrushBuilder};

let garamond: &[u8] = include_bytes!("GaramondNo8-Reg.ttf");
let mut glyph_brush = GlyphBrushBuilder::using_font_bytes(garamond)
    .build(gfx_factory.clone());

let section = Section {
    text: "Hello gfx_glyph",
    ..Section::default() // color, position, etc
};

glyph_brush.queue(section);
glyph_brush.queue(some_other_section);

glyph_brush.draw_queued(&mut gfx_encoder, &gfx_color, &gfx_depth).unwrap();

Examples

Have a look at

• cargo run --example paragraph --release
• cargo run --example performance --release
• cargo run --example varied --release
• cargo run --example depth --release

Limitations

The current implementation supports OpenGL (3.0 or later). However, other rendering languages (that are supported by gfx) should be easy enough to add. Send in your PRs!