PolytreeDE/alacritty
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build rect describing glyph quad

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This commit is contained in:
Joe Wilm 2016-02-24 19:08:57 -08:00
parent 9f8aa9c315
commit 400e4c92a7
3 changed files with 29 additions and 12 deletions
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11
Cargo.lock generated
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@ -3,6 +3,7 @@ name = "alacritty"
version = "0.1.0"
dependencies = [
"cgmath 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
"euclid 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
"freetype-rs 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
"gl 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
"glutin 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
@ -112,6 +113,16 @@ dependencies = [
"libc 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "euclid"
version = "0.6.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"log 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
"num 0.1.31 (registry+https://github.com/rust-lang/crates.io-index)",
"rustc-serialize 0.3.18 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "expat-sys"
version = "2.1.2"

1
Cargo.toml
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@ -11,3 +11,4 @@ libc = "*"
glutin = "*"
gl = "*"
cgmath = "0.7"
euclid = "0.6"

29
src/main.rs
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@ -4,15 +4,17 @@ extern crate libc;
extern crate glutin;
extern crate gl;
extern crate cgmath;
extern crate euclid;
mod list_fonts;
mod text;
use std::ffi::CString;
use std::mem::size_of;
use std::ptr;
use euclid::{Rect, Size2D, Point2D};
use libc::c_void;
use gl::types::*;
@ -90,6 +92,13 @@ fn main() {
}
}
fn get_rect(glyph: &RasterizedGlyph, x: f32, y: f32) -> Rect<f32> {
Rect::new(
Point2D::new(x, y),
Size2D::new(glyph.width as f32, glyph.height as f32)
)
}
/// Render a character
///
/// TODO use element array to describe quad instead
@ -102,21 +111,17 @@ fn render(program: &ShaderProgram, glyph: &RasterizedGlyph, tex: &AlphaTexture,
gl::Uniform3f(program.color, 1., 1., 0.5);
}
// bottom left of character
let left = 10. as f32;
let bottom = 10. as f32;
let rect = get_rect(glyph, 10.0, 10.0);
// top right of character
let top = bottom + glyph.height as f32;
let right = left + glyph.width as f32;
let vertices: [[f32; 4]; 6] = [
[left, top, 0., 0.],
[left, bottom, 0., 1.],
[right, bottom, 1., 1.],
[rect.min_x(), rect.max_y(), 0., 0.],
[rect.min_x(), rect.min_y(), 0., 1.],
[rect.max_x(), rect.min_y(), 1., 1.],
[left, top, 0., 0.],
[right, bottom, 1., 1.],
[right, top, 1., 0.],
[rect.min_x(), rect.max_y(), 0., 0.],
[rect.max_x(), rect.min_y(), 1., 1.],
[rect.max_x(), rect.max_y(), 1., 0.],
];
unsafe {