Render the letter J
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This commit is contained in:
Joe Wilm
parent
e301843686
commit
2b7caf95fd
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@ -2,16 +2,116 @@
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@ -41,16 +141,120 @@ dependencies = [
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@ -61,16 +265,91 @@ dependencies = [
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[[package]]
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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@ -90,3 +369,119 @@ dependencies = [
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dependencies = [
|
||||
"bitflags 0.3.3 (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)",
|
||||
"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)",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "wayland-scanner"
|
||||
version = "0.5.8"
|
||||
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)",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "wayland-sys"
|
||||
version = "0.5.9"
|
||||
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)",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "wayland-window"
|
||||
version = "0.2.2"
|
||||
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)",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "winapi"
|
||||
version = "0.2.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
|
||||
[[package]]
|
||||
name = "winapi-build"
|
||||
version = "0.1.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
|
||||
[[package]]
|
||||
name = "x11-dl"
|
||||
version = "2.3.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
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)",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "xml-rs"
|
||||
version = "0.2.2"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
dependencies = [
|
||||
"bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
]
|
||||
|
||||
|
|
|
|||
|
|
@ -7,3 +7,6 @@ authors = ["Joe Wilm <joe@jwilm.com>"]
|
|||
servo-fontconfig = { git = "https://github.com/jwilm/rust-fontconfig" }
|
||||
freetype-rs = "0.5.0"
|
||||
libc = "*"
|
||||
glutin = "*"
|
||||
gl = "*"
|
||||
cgmath = "0.7"
|
||||
|
|
|
|||
|
|
@ -0,0 +1,11 @@
|
|||
#version 330 core
|
||||
in vec2 TexCoords;
|
||||
|
||||
uniform sampler2D text;
|
||||
uniform vec3 textColor;
|
||||
|
||||
void main()
|
||||
{
|
||||
vec4 sampled = vec4(1.0, 1.0, 1.0, texture(text, TexCoords).r);
|
||||
gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0) * sampled;
|
||||
}
|
||||
|
|
@ -0,0 +1,11 @@
|
|||
#version 330 core
|
||||
layout (location = 0) in vec4 vertex;
|
||||
out vec2 TexCoords;
|
||||
|
||||
uniform mat4 projection;
|
||||
|
||||
void main()
|
||||
{
|
||||
gl_Position = projection * vec4(vertex.xy, 0.0, 1.0);
|
||||
TexCoords = vertex.zw;
|
||||
}
|
||||
297
src/main.rs
297
src/main.rs
|
|
@ -1,10 +1,305 @@
|
|||
extern crate fontconfig;
|
||||
extern crate freetype;
|
||||
extern crate libc;
|
||||
extern crate glutin;
|
||||
extern crate gl;
|
||||
extern crate cgmath;
|
||||
|
||||
mod list_fonts;
|
||||
mod text;
|
||||
|
||||
|
||||
use std::ffi::CString;
|
||||
use std::mem::size_of;
|
||||
use std::ptr;
|
||||
|
||||
use libc::c_void;
|
||||
|
||||
use gl::types::*;
|
||||
|
||||
use cgmath::Matrix;
|
||||
|
||||
use text::RasterizedGlyph;
|
||||
|
||||
static TEXT_SHADER_V: &'static str = include_str!("../res/text.v.glsl");
|
||||
static TEXT_SHADER_F: &'static str = include_str!("../res/text.f.glsl");
|
||||
|
||||
fn main() {
|
||||
println!("Hello, world!");
|
||||
let window = glutin::Window::new().unwrap();
|
||||
let (width, height) = window.get_inner_size_pixels().unwrap();
|
||||
unsafe {
|
||||
window.make_current()
|
||||
};
|
||||
|
||||
unsafe {
|
||||
gl::load_with(|symbol| window.get_proc_address(symbol) as *const _);
|
||||
gl::Viewport(0, 0, width as i32, height as i32);
|
||||
}
|
||||
|
||||
let rasterizer = text::Rasterizer::new();
|
||||
let glyph_j = rasterizer.get_glyph(180., 'J');
|
||||
|
||||
let tex = AlphaTexture::new(
|
||||
glyph_j.width as i32,
|
||||
glyph_j.height as i32,
|
||||
glyph_j.buf.as_ptr() as *const _
|
||||
);
|
||||
|
||||
unsafe {
|
||||
gl::Enable(gl::BLEND);
|
||||
gl::BlendFunc(gl::SRC_ALPHA, gl::ONE_MINUS_SRC_ALPHA);
|
||||
}
|
||||
|
||||
let mut vao: GLuint = 0;
|
||||
let mut vbo: GLuint = 0;
|
||||
unsafe {
|
||||
gl::GenVertexArrays(1, &mut vao);
|
||||
gl::GenBuffers(1, &mut vbo);
|
||||
gl::BindVertexArray(vao);
|
||||
|
||||
gl::BindBuffer(gl::ARRAY_BUFFER, vbo);
|
||||
gl::BufferData(
|
||||
gl::ARRAY_BUFFER,
|
||||
(size_of::<f32>() * 6 * 4) as GLsizeiptr,
|
||||
ptr::null(),
|
||||
gl::DYNAMIC_DRAW
|
||||
);
|
||||
gl::EnableVertexAttribArray(0);
|
||||
gl::VertexAttribPointer(0, 4, gl::FLOAT, gl::FALSE, 4 * size_of::<f32>() as i32,
|
||||
ptr::null());
|
||||
gl::BindBuffer(gl::ARRAY_BUFFER, 0);
|
||||
gl::BindVertexArray(0);
|
||||
}
|
||||
|
||||
let program = ShaderProgram::new(width, height);
|
||||
|
||||
for event in window.wait_events() {
|
||||
unsafe {
|
||||
gl::ClearColor(0.08, 0.08, 0.08, 1.0);
|
||||
gl::Clear(gl::COLOR_BUFFER_BIT);
|
||||
}
|
||||
|
||||
render(&program, &glyph_j, &tex, vbo, vao);
|
||||
|
||||
window.swap_buffers();
|
||||
|
||||
match event {
|
||||
glutin::Event::Closed => break,
|
||||
_ => ()
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Render a character
|
||||
///
|
||||
/// TODO use element array to describe quad instead
|
||||
fn render(program: &ShaderProgram, glyph: &RasterizedGlyph, tex: &AlphaTexture, vbo: GLuint,
|
||||
vao: GLuint)
|
||||
{
|
||||
program.activate();
|
||||
unsafe {
|
||||
// set color
|
||||
gl::Uniform3f(program.color, 1., 1., 0.5);
|
||||
}
|
||||
|
||||
// bottom left of character
|
||||
let left = 10. as f32;
|
||||
let bottom = 10. as f32;
|
||||
|
||||
// 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.],
|
||||
|
||||
[left, top, 0., 0.],
|
||||
[right, bottom, 1., 1.],
|
||||
[right, top, 1., 0.],
|
||||
];
|
||||
|
||||
unsafe {
|
||||
gl::ActiveTexture(gl::TEXTURE0);
|
||||
gl::BindVertexArray(vao);
|
||||
|
||||
gl::BindTexture(gl::TEXTURE_2D, tex.id);
|
||||
gl::BindBuffer(gl::ARRAY_BUFFER, vbo);
|
||||
gl::BufferSubData(
|
||||
gl::ARRAY_BUFFER,
|
||||
0,
|
||||
(4 * 6 * size_of::<f32>()) as isize,
|
||||
vertices.as_ptr() as *const _
|
||||
);
|
||||
gl::BindBuffer(gl::ARRAY_BUFFER, 0);
|
||||
|
||||
|
||||
gl::DrawArrays(gl::TRIANGLES, 0, 6);
|
||||
gl::BindVertexArray(0);
|
||||
gl::BindTexture(gl::TEXTURE_2D, 0);
|
||||
}
|
||||
|
||||
program.deactivate();
|
||||
}
|
||||
|
||||
pub struct ShaderProgram {
|
||||
id: GLuint,
|
||||
/// uniform location for projection matrix
|
||||
projection: GLint,
|
||||
/// uniform location foyr textColor
|
||||
color: GLint,
|
||||
}
|
||||
|
||||
impl ShaderProgram {
|
||||
pub fn activate(&self) {
|
||||
unsafe {
|
||||
gl::UseProgram(self.id);
|
||||
}
|
||||
}
|
||||
|
||||
pub fn deactivate(&self) {
|
||||
unsafe {
|
||||
gl::UseProgram(0);
|
||||
}
|
||||
}
|
||||
|
||||
pub fn new(width: u32, height: u32) -> ShaderProgram {
|
||||
let vertex_shader = ShaderProgram::create_vertex_shader();
|
||||
let fragment_shader = ShaderProgram::create_fragment_shader();
|
||||
let program = ShaderProgram::create_program(vertex_shader, fragment_shader);
|
||||
|
||||
unsafe {
|
||||
gl::DeleteShader(vertex_shader);
|
||||
gl::DeleteShader(fragment_shader);
|
||||
}
|
||||
|
||||
// get uniform locations
|
||||
let projection_str = CString::new("projection").unwrap();
|
||||
let color_str = CString::new("textColor").unwrap();
|
||||
|
||||
let (projection, color) = unsafe {
|
||||
(
|
||||
gl::GetUniformLocation(program, projection_str.as_ptr()),
|
||||
gl::GetUniformLocation(program, color_str.as_ptr())
|
||||
)
|
||||
};
|
||||
|
||||
assert!(projection != gl::INVALID_VALUE as i32);
|
||||
assert!(projection != gl::INVALID_OPERATION as i32);
|
||||
assert!(color != gl::INVALID_VALUE as i32);
|
||||
assert!(color != gl::INVALID_OPERATION as i32);
|
||||
|
||||
let shader = ShaderProgram {
|
||||
id: program,
|
||||
projection: projection,
|
||||
color: color,
|
||||
};
|
||||
|
||||
// set projection uniform
|
||||
let ortho = cgmath::ortho(0., width as f32, 0., height as f32, -1., 1.);
|
||||
let projection: [[f32; 4]; 4] = ortho.into();
|
||||
|
||||
println!("width: {}, height: {}", width, height);
|
||||
|
||||
shader.activate();
|
||||
unsafe {
|
||||
gl::UniformMatrix4fv(shader.projection, 1, gl::FALSE, projection.as_ptr() as *const _);
|
||||
}
|
||||
shader.deactivate();
|
||||
|
||||
shader
|
||||
}
|
||||
|
||||
fn create_program(vertex: GLuint, fragment: GLuint) -> GLuint {
|
||||
|
||||
unsafe {
|
||||
let program = gl::CreateProgram();
|
||||
gl::AttachShader(program, vertex);
|
||||
gl::AttachShader(program, fragment);
|
||||
gl::LinkProgram(program);
|
||||
|
||||
let mut success: GLint = 0;
|
||||
gl::GetProgramiv(program, gl::LINK_STATUS, &mut success);
|
||||
|
||||
if success != (gl::TRUE as GLint) {
|
||||
panic!("failed to link shader program");
|
||||
}
|
||||
program
|
||||
}
|
||||
}
|
||||
|
||||
fn create_fragment_shader() -> GLuint {
|
||||
unsafe {
|
||||
let fragment_shader = gl::CreateShader(gl::FRAGMENT_SHADER);
|
||||
let fragment_source = CString::new(TEXT_SHADER_F).unwrap();
|
||||
gl::ShaderSource(fragment_shader, 1, &fragment_source.as_ptr(), ptr::null());
|
||||
gl::CompileShader(fragment_shader);
|
||||
|
||||
let mut success: GLint = 0;
|
||||
gl::GetShaderiv(fragment_shader, gl::COMPILE_STATUS, &mut success);
|
||||
|
||||
if success != (gl::TRUE as GLint) {
|
||||
panic!("failed to compiler fragment shader");
|
||||
}
|
||||
fragment_shader
|
||||
}
|
||||
}
|
||||
|
||||
fn create_vertex_shader() -> GLuint {
|
||||
unsafe {
|
||||
let vertex_shader = gl::CreateShader(gl::VERTEX_SHADER);
|
||||
let vertex_source = CString::new(TEXT_SHADER_V).unwrap();
|
||||
gl::ShaderSource(vertex_shader, 1, &vertex_source.as_ptr(), ptr::null());
|
||||
gl::CompileShader(vertex_shader);
|
||||
|
||||
let mut success: GLint = 0;
|
||||
gl::GetShaderiv(vertex_shader, gl::COMPILE_STATUS, &mut success);
|
||||
|
||||
if success != (gl::TRUE as GLint) {
|
||||
panic!("failed to compiler vertex shader");
|
||||
}
|
||||
vertex_shader
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
struct AlphaTexture {
|
||||
pub id: GLuint,
|
||||
pub width: i32,
|
||||
pub height: i32,
|
||||
}
|
||||
|
||||
impl AlphaTexture {
|
||||
pub fn new(width: i32, height: i32, bytes: *const ::std::os::raw::c_void) -> AlphaTexture {
|
||||
let mut id: GLuint = 0;
|
||||
unsafe {
|
||||
gl::PixelStorei(gl::UNPACK_ALIGNMENT, 1);
|
||||
gl::GenTextures(1, &mut id);
|
||||
gl::BindTexture(gl::TEXTURE_2D, id);
|
||||
gl::TexImage2D(
|
||||
gl::TEXTURE_2D,
|
||||
0,
|
||||
gl::RED as i32,
|
||||
width as i32,
|
||||
height as i32,
|
||||
0,
|
||||
gl::RED,
|
||||
gl::UNSIGNED_BYTE,
|
||||
bytes
|
||||
);
|
||||
|
||||
gl::TexParameteri(gl::TEXTURE_2D, gl::TEXTURE_WRAP_S, gl::CLAMP_TO_EDGE as i32);
|
||||
gl::TexParameteri(gl::TEXTURE_2D, gl::TEXTURE_WRAP_T, gl::CLAMP_TO_EDGE as i32);
|
||||
gl::TexParameteri(gl::TEXTURE_2D, gl::TEXTURE_MIN_FILTER, gl::LINEAR as i32);
|
||||
gl::TexParameteri(gl::TEXTURE_2D, gl::TEXTURE_MAG_FILTER, gl::LINEAR as i32);
|
||||
|
||||
gl::BindTexture(gl::TEXTURE_2D, 0);
|
||||
}
|
||||
|
||||
AlphaTexture {
|
||||
id: id,
|
||||
width: width,
|
||||
height: height,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
12
src/text.rs
12
src/text.rs
|
|
@ -49,12 +49,12 @@ impl Rasterizer {
|
|||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
struct RasterizedGlyph {
|
||||
width: usize,
|
||||
height: usize,
|
||||
top: usize,
|
||||
left: usize,
|
||||
buf: Vec<u8>,
|
||||
pub struct RasterizedGlyph {
|
||||
pub width: usize,
|
||||
pub height: usize,
|
||||
pub top: usize,
|
||||
pub left: usize,
|
||||
pub buf: Vec<u8>,
|
||||
}
|
||||
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue