120 lines
4.6 KiB
Rust
120 lines
4.6 KiB
Rust
/* Any copyright is dedicated to the Public Domain.
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* http://creativecommons.org/publicdomain/zero/1.0/ */
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extern crate compute_shader;
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extern crate euclid;
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extern crate gl;
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extern crate glfw;
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extern crate lord_drawquaad;
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extern crate memmap;
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extern crate pathfinder;
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use compute_shader::buffer;
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use compute_shader::instance::Instance;
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use compute_shader::texture::{ExternalTexture, Format};
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use euclid::{Point2D, Rect, Size2D};
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use gl::types::{GLint, GLuint};
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use glfw::{Action, Context, Key, OpenGlProfileHint, WindowEvent, WindowHint, WindowMode};
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use memmap::{Mmap, Protection};
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use pathfinder::batch::{BatchBuilder, GlyphRange};
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use pathfinder::charmap::CodepointRange;
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use pathfinder::coverage::CoverageBuffer;
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use pathfinder::glyph_buffer::GlyphBufferBuilder;
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use pathfinder::otf::Font;
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use pathfinder::rasterizer::{Rasterizer, RasterizerOptions};
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use std::env;
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use std::os::raw::c_void;
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const POINT_SIZE: f32 = 24.0;
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const WIDTH: u32 = 512;
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const HEIGHT: u32 = 384;
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const SHELF_HEIGHT: u32 = 32;
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fn main() {
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let mut glfw = glfw::init(glfw::LOG_ERRORS).unwrap();
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glfw.window_hint(WindowHint::ContextVersion(3, 3));
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glfw.window_hint(WindowHint::OpenGlForwardCompat(true));
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glfw.window_hint(WindowHint::OpenGlProfile(OpenGlProfileHint::Core));
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let context = glfw.create_window(WIDTH, HEIGHT, "generate-atlas", WindowMode::Windowed);
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let (mut window, events) = context.expect("Couldn't create a window!");
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window.make_current();
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gl::load_with(|symbol| window.get_proc_address(symbol) as *const c_void);
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let (device_pixel_width, device_pixel_height) = window.get_framebuffer_size();
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let instance = Instance::new().unwrap();
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let device = instance.create_device().unwrap();
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let queue = device.create_queue().unwrap();
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let rasterizer_options = RasterizerOptions::from_env().unwrap();
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let rasterizer = Rasterizer::new(&instance, device, queue, rasterizer_options).unwrap();
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let mut glyph_buffer_builder = GlyphBufferBuilder::new();
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let mut batch_builder = BatchBuilder::new(device_pixel_width as GLuint, SHELF_HEIGHT);
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let file = Mmap::open_path(env::args().nth(1).unwrap(), Protection::Read).unwrap();
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unsafe {
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let font = Font::new(file.as_slice()).unwrap();
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let codepoint_ranges = [CodepointRange::new('!' as u32, '~' as u32)];
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let glyph_ranges = font.cmap.glyph_ranges_for_codepoint_ranges(&codepoint_ranges).unwrap();
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for (glyph_index, glyph_id) in glyph_ranges.iter().flat_map(GlyphRange::iter).enumerate() {
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glyph_buffer_builder.add_glyph(&font, glyph_id as u32).unwrap();
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batch_builder.add_glyph(&glyph_buffer_builder, glyph_index as u32, POINT_SIZE).unwrap()
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}
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}
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let glyph_buffers = glyph_buffer_builder.finish().unwrap();
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let batch = batch_builder.finish(&glyph_buffer_builder).unwrap();
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let atlas_size = Size2D::new(device_pixel_width as GLuint, device_pixel_height as GLuint);
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let coverage_buffer = CoverageBuffer::new(&rasterizer.device, &atlas_size).unwrap();
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let texture = rasterizer.device
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.create_texture(Format::R8, buffer::Protection::WriteOnly, &atlas_size)
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.unwrap();
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rasterizer.draw_atlas(&Rect::new(Point2D::new(0, 0), atlas_size),
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SHELF_HEIGHT,
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&glyph_buffers,
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&batch,
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&coverage_buffer,
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&texture).unwrap().wait().unwrap();
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let draw_context = lord_drawquaad::Context::new();
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let mut gl_texture = 0;
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unsafe {
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gl::GenTextures(1, &mut gl_texture);
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texture.bind_to(&ExternalTexture::Gl(gl_texture)).unwrap();
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gl::BindTexture(gl::TEXTURE_RECTANGLE, gl_texture);
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gl::TexParameteri(gl::TEXTURE_RECTANGLE, gl::TEXTURE_MIN_FILTER, gl::LINEAR as GLint);
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gl::TexParameteri(gl::TEXTURE_RECTANGLE, gl::TEXTURE_MAG_FILTER, gl::LINEAR as GLint);
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gl::TexParameteri(gl::TEXTURE_RECTANGLE, gl::TEXTURE_WRAP_S, gl::CLAMP_TO_EDGE as GLint);
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gl::TexParameteri(gl::TEXTURE_RECTANGLE, gl::TEXTURE_WRAP_T, gl::CLAMP_TO_EDGE as GLint);
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}
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unsafe {
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gl::Viewport(0, 0, device_pixel_width, device_pixel_height);
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gl::ClearColor(1.0, 1.0, 1.0, 1.0);
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gl::Clear(gl::COLOR_BUFFER_BIT);
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}
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draw_context.draw(gl_texture);
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window.swap_buffers();
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while !window.should_close() {
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glfw.poll_events();
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for (_, event) in glfw::flush_messages(&events) {
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match event {
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WindowEvent::Key(Key::Escape, _, Action::Press, _) => {
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window.set_should_close(true)
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}
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_ => {}
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}
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}
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}
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}
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