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alacritty
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Correct sub-pixel font rendering with OpenGL 

Uses the GL_ARB_blend_func_extended to get single-pass, per-channel
alpha blending. gl_generator is now used instead of gl to enable the
extension.

The background color is removed since that presumably needs to run in a
separate pass.
This commit is contained in:
Joe Wilm 2016-05-20 21:36:28 -07:00
parent e794bc11b9
commit c70acbac0b
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GPG Key ID: 39B57C6972F518DA
7 changed files with 250 additions and 164 deletions
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334
Cargo.lock generated
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@ -3,11 +3,11 @@ name = "alacritty"
version = "0.1.0"
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@ -21,9 +21,14 @@ name = "bitflags"
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@ -210,34 +215,34 @@ source = "git+https://github.com/jwilm/glutin?rev=c95e6973ace3cbf321123a64588b27
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@ -248,41 +253,43 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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name = "pkg-config"
version = "0.3.7"
version = "0.3.8"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
@ -345,28 +409,38 @@ name = "rand"
version = "0.3.14"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"libc 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "rustc-serialize"
version = "0.3.18"
version = "0.3.19"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "rustc_version"
version = "0.1.7"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"semver 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "semver"
version = "0.1.20"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "serde"
version = "0.6.14"
version = "0.7.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"num 0.1.31 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "servo-fontconfig"
version = "0.2.0"
source = "git+https://github.com/jwilm/rust-fontconfig#419135e5e1106ec0973dd4923bd9c70d8e438cc8"
dependencies = [
"libc 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
"servo-fontconfig-sys 2.11.3 (git+https://github.com/jwilm/libfontconfig)",
]
@ -377,7 +451,7 @@ source = "git+https://github.com/jwilm/libfontconfig#1d7544dc1ff6a7d0f3a9e6a27b5
dependencies = [
"expat-sys 2.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
"freetype-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
"pkg-config 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
"pkg-config 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
@ -385,8 +459,8 @@ name = "shared_library"
version = "0.1.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"lazy_static 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
"lazy_static 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
@ -394,19 +468,20 @@ name = "shell32-sys"
version = "0.1.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"winapi 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
"winapi 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
"winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "tempfile"
version = "1.1.3"
version = "2.1.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"kernel32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
"kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
"rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
"winapi 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
"rustc_version 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
"winapi 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
@ -414,64 +489,65 @@ name = "user32-sys"
version = "0.1.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"winapi 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
"winapi 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
"winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "wayland-client"
version = "0.5.9"
version = "0.5.12"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
"crossbeam 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
"wayland-scanner 0.5.8 (registry+https://github.com/rust-lang/crates.io-index)",
"wayland-sys 0.5.9 (registry+https://github.com/rust-lang/crates.io-index)",
"bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
"crossbeam 0.2.9 (registry+https://github.com/rust-lang/crates.io-index)",
"dlib 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
"wayland-scanner 0.5.11 (registry+https://github.com/rust-lang/crates.io-index)",
"wayland-sys 0.5.11 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "wayland-kbd"
version = "0.3.5"
version = "0.3.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
"bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
"dlib 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
"lazy_static 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)",
"lazy_static 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
"memmap 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
"wayland-client 0.5.9 (registry+https://github.com/rust-lang/crates.io-index)",
"wayland-client 0.5.12 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "wayland-scanner"
version = "0.5.8"
version = "0.5.11"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"xml-rs 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
"xml-rs 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "wayland-sys"
version = "0.5.9"
version = "0.5.11"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"dlib 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
"lazy_static 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)",
"lazy_static 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "wayland-window"
version = "0.2.2"
version = "0.2.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"byteorder 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
"tempfile 1.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
"wayland-client 0.5.9 (registry+https://github.com/rust-lang/crates.io-index)",
"byteorder 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
"tempfile 2.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
"wayland-client 0.5.12 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "winapi"
version = "0.2.5"
version = "0.2.7"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
@ -485,7 +561,7 @@ version = "2.4.0"
source = "git+https://github.com/jwilm/x11-rs?rev=40f08df7b4408980b922b3c6e258c9c6765c2c24#40f08df7b4408980b922b3c6e258c9c6765c2c24"
dependencies = [
"dylib 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
@ -496,3 +572,11 @@ dependencies = [
"bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "xml-rs"
version = "0.3.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
]

6
Cargo.toml
View File

@ -4,14 +4,18 @@ version = "0.1.0"
authors = ["Joe Wilm <joe@jwilm.com>"]
license = "Apache-2.0"
build = "build.rs"
[dependencies]
servo-fontconfig = { git = "https://github.com/jwilm/rust-fontconfig" }
freetype-rs = "0.5.0"
libc = "*"
gl = "*"
cgmath = "0.7"
euclid = "0.6"
[build-dependencies]
gl_generator = "0.5"
[dependencies.glutin]
git = "https://github.com/jwilm/glutin"
rev = "c95e6973ace3cbf321123a64588b27f032675be9"

17
build.rs Normal file
View File

@ -0,0 +1,17 @@
extern crate gl_generator;
use gl_generator::{Registry, Api, Profile, Fallbacks, GlobalGenerator};
use std::env;
use std::fs::File;
use std::path::Path;
fn main() {
let dest = env::var("OUT_DIR").unwrap();
let mut file = File::create(&Path::new(&dest).join("gl_bindings.rs")).unwrap();
Registry::new(Api::Gl, (4, 5), Profile::Core, Fallbacks::All, [
"GL_ARB_blend_func_extended"
])
.write_bindings(GlobalGenerator, &mut file)
.unwrap();
}

26
res/text.f.glsl
View File

@ -1,30 +1,14 @@
#version 330 core
in vec2 TexCoords;
layout(location = 0, index = 0) out vec4 color;
layout(location = 0, index = 1) out vec4 alphaMask;
uniform sampler2D mask;
uniform vec3 textColor;
uniform vec3 bgColor;
// SRC = SRC_ALPHA; DST = 1 - SRC_ALPHA
void MyBlend(in vec3 srcValue,
in vec3 dstValue,
in vec3 srcAlpha,
out vec3 blended)
{
vec3 dstAlpha = vec3(1.0, 1.0, 1.0) - srcAlpha;
vec3 preBlended = (srcValue * srcAlpha + dstValue * dstAlpha);
blended = vec3(min(1.0, preBlended.x),
min(1.0, preBlended.y),
min(1.0, preBlended.z));
}
void main()
{
// vec4 red = vec4(sampled.rgb, sampled.r * sampled.g * sampled.b);
// vec4 sampled = vec4(1.0, 1.0, 1.0, texture(mask, TexCoords));
vec3 blended = vec3(1.0, 1.0, 1.0);
MyBlend(textColor, bgColor, texture(mask, TexCoords).rgb, blended);
gl_FragColor = vec4(blended, 1.0);
alphaMask = vec4(texture(mask, TexCoords).rgb, 1.);
color = vec4(textColor, 1.);
}

13
src/main.rs
View File

@ -2,7 +2,6 @@ extern crate fontconfig;
extern crate freetype;
extern crate libc;
extern crate glutin;
extern crate gl;
extern crate cgmath;
extern crate euclid;
@ -17,6 +16,10 @@ use renderer::{Glyph, QuadRenderer};
use text::FontDesc;
use grid::Grid;
mod gl {
include!(concat!(env!("OUT_DIR"), "/gl_bindings.rs"));
}
static INIT_LIST: &'static str = "abcdefghijklmnopqrstuvwxyz\
ABCDEFGHIJKLMNOPQRSTUVWXYZ\
01234567890\
@ -37,7 +40,7 @@ fn main() {
let (dpi_x, dpi_y) = window.get_dpi().unwrap();
let dpr = window.hidpi_factor();
let font_size = 11.0;
let font_size = 11.;
let sep_x = 2;
let sep_y = 5;
@ -92,8 +95,8 @@ fn main() {
}
unsafe {
// gl::Enable(gl::BLEND);
// gl::BlendFunc(gl::SRC_ALPHA, gl::ONE_MINUS_SRC_ALPHA);
gl::Enable(gl::BLEND);
gl::BlendFunc(gl::SRC1_COLOR, gl::ONE_MINUS_SRC1_COLOR);
gl::Enable(gl::MULTISAMPLE);
}
@ -101,7 +104,7 @@ fn main() {
for event in window.wait_events() {
unsafe {
gl::ClearColor(0.08, 0.08, 0.08, 1.0);
gl::ClearColor(0.0, 0.0, 0.00, 1.0);
gl::Clear(gl::COLOR_BUFFER_BIT);
}

12
src/renderer/mod.rs
View File

@ -96,8 +96,7 @@ impl QuadRenderer {
self.program.activate();
unsafe {
// set color
gl::Uniform3f(self.program.u_color, 1., 1., 0.5);
gl::Uniform3f(self.program.u_bg_color, 0.08, 0.08, 0.08);
gl::Uniform3f(self.program.u_color, 0.917, 0.917, 0.917);
}
let rect = get_rect(glyph, x, y);
@ -153,8 +152,6 @@ pub struct ShaderProgram {
u_projection: GLint,
/// color uniform
u_color: GLint,
/// background color uniform
u_bg_color: GLint,
}
impl ShaderProgram {
@ -183,13 +180,11 @@ impl ShaderProgram {
// get uniform locations
let projection_str = CString::new("projection").unwrap();
let color_str = CString::new("textColor").unwrap();
let bg_color_str = CString::new("bgColor").unwrap();
let (projection, color, bg_color) = unsafe {
let (projection, color) = unsafe {
(
gl::GetUniformLocation(program, projection_str.as_ptr()),
gl::GetUniformLocation(program, color_str.as_ptr()),
gl::GetUniformLocation(program, bg_color_str.as_ptr()),
)
};
@ -197,14 +192,11 @@ impl ShaderProgram {
assert!(projection != gl::INVALID_OPERATION as i32);
assert!(color != gl::INVALID_VALUE as i32);
assert!(color != gl::INVALID_OPERATION as i32);
assert!(bg_color != gl::INVALID_VALUE as i32);
assert!(bg_color != gl::INVALID_OPERATION as i32);
let shader = ShaderProgram {
id: program,
u_projection: projection,
u_color: color,
u_bg_color: bg_color,
};
// set projection uniform

6
src/text.rs
View File

@ -91,8 +91,10 @@ impl Rasterizer {
let glyph = face.glyph();
glyph.render_glyph(freetype::render_mode::RenderMode::Lcd).unwrap();
// FIXME need LCD filtering to reduce color fringes with subpixel rendering. The freetype
// bindings don't currently expose this!
unsafe {
let ft_lib = self.library.raw();
freetype::ffi::FT_Library_SetLcdFilter(ft_lib, freetype::ffi::FT_LCD_FILTER_LIGHT);
}
let bitmap = glyph.bitmap();
let buf = bitmap.buffer();