2019-01-30 17:42:06 -05:00
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// pathfinder/demo3/src/debug_text.rs
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//
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// Copyright © 2019 The Pathfinder Project Developers.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! Minimal text rendering.
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//!
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//! We don't render the demo UI text using Pathfinder itself so that we can use the debug UI to
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//! debug Pathfinder if it's totally busted.
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//!
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//! The debug font atlas was generated using: https://evanw.github.io/font-texture-generator/
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use crate::device::{Buffer, BufferTarget, BufferUploadMode, Program, Texture, Uniform, VertexAttr};
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use euclid::{Point2D, Rect, Size2D};
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use gl::types::{GLfloat, GLint, GLsizei, GLuint};
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use gl;
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use pathfinder_renderer::paint::ColorU;
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use serde_json;
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use std::collections::HashMap;
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use std::fs::File;
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use std::io::BufReader;
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use std::ptr;
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use std::time::Duration;
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const DEBUG_FONT_VERTEX_SIZE: GLint = 8;
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const DEBUG_SOLID_VERTEX_SIZE: GLint = 4;
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const WINDOW_WIDTH: i16 = 400;
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2019-01-30 18:30:40 -05:00
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const WINDOW_HEIGHT: i16 = LINE_HEIGHT * 3 + PADDING + 3;
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2019-01-30 17:42:06 -05:00
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const PADDING: i16 = 12;
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const FONT_ASCENT: i16 = 28;
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const LINE_HEIGHT: i16 = 42;
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static WINDOW_COLOR: ColorU = ColorU { r: 30, g: 30, b: 30, a: 255 - 30 };
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static JSON_PATH: &'static str = "resources/debug-font.json";
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static PNG_NAME: &'static str = "debug-font";
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static QUAD_INDICES: [u32; 6] = [0, 1, 3, 1, 2, 3];
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#[derive(Deserialize)]
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#[allow(dead_code)]
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pub struct DebugFont {
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name: String,
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size: i32,
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bold: bool,
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italic: bool,
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width: u32,
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height: u32,
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characters: HashMap<char, DebugCharacter>,
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}
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#[derive(Deserialize)]
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struct DebugCharacter {
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x: u16,
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y: u16,
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width: u16,
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height: u16,
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#[serde(rename = "originX")]
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origin_x: i16,
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#[serde(rename = "originY")]
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origin_y: i16,
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advance: i16,
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}
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impl DebugFont {
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fn load() -> DebugFont {
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serde_json::from_reader(BufReader::new(File::open(JSON_PATH).unwrap())).unwrap()
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}
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}
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pub struct DebugRenderer {
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framebuffer_size: Size2D<u32>,
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font_program: DebugFontProgram,
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font_vertex_array: DebugFontVertexArray,
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font_texture: Texture,
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font: DebugFont,
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solid_program: DebugSolidProgram,
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solid_vertex_array: DebugSolidVertexArray,
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}
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impl DebugRenderer {
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pub fn new(framebuffer_size: &Size2D<u32>) -> DebugRenderer {
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let font_program = DebugFontProgram::new();
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let font_vertex_array = DebugFontVertexArray::new(&font_program);
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let font_texture = Texture::from_png(PNG_NAME);
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let font = DebugFont::load();
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let solid_program = DebugSolidProgram::new();
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let solid_vertex_array = DebugSolidVertexArray::new(&solid_program);
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solid_vertex_array.index_buffer.upload(&QUAD_INDICES,
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BufferTarget::Index,
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BufferUploadMode::Static);
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DebugRenderer {
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framebuffer_size: *framebuffer_size,
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font_program,
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font_vertex_array,
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font_texture,
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font,
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solid_program,
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solid_vertex_array,
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}
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}
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pub fn set_framebuffer_size(&mut self, window_size: &Size2D<u32>) {
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self.framebuffer_size = *window_size;
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}
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2019-01-30 18:30:40 -05:00
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pub fn draw(&self,
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prepare_time: Duration,
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tile_time: Duration,
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rendering_time: Option<Duration>) {
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let window_rect =
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Rect::new(Point2D::new(self.framebuffer_size.width as i16 - PADDING - WINDOW_WIDTH,
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self.framebuffer_size.height as i16 - PADDING - WINDOW_HEIGHT),
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Size2D::new(WINDOW_WIDTH, WINDOW_HEIGHT));
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self.draw_solid_rect(&window_rect, WINDOW_COLOR);
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self.draw_text(&format!("Preparation: {:.3} ms", duration_ms(prepare_time)),
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&Point2D::new(window_rect.origin.x + PADDING,
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window_rect.origin.y + PADDING + FONT_ASCENT));
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self.draw_text(&format!("Tiling: {:.3} ms", duration_ms(tile_time)),
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&Point2D::new(window_rect.origin.x + PADDING,
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window_rect.origin.y + PADDING + FONT_ASCENT + LINE_HEIGHT));
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2019-01-30 18:30:40 -05:00
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if let Some(rendering_time) = rendering_time {
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self.draw_text(&format!("Rendering: {:.3} ms", duration_ms(rendering_time)),
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&Point2D::new(
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window_rect.origin.x + PADDING,
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window_rect.origin.y + PADDING + FONT_ASCENT + LINE_HEIGHT * 2));
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}
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2019-01-30 17:42:06 -05:00
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}
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fn draw_solid_rect(&self, rect: &Rect<i16>, color: ColorU) {
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let vertex_data = [
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DebugSolidVertex::new(rect.origin),
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DebugSolidVertex::new(rect.top_right()),
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DebugSolidVertex::new(rect.bottom_right()),
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DebugSolidVertex::new(rect.bottom_left()),
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];
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self.solid_vertex_array
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.vertex_buffer
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.upload(&vertex_data, BufferTarget::Vertex, BufferUploadMode::Dynamic);
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unsafe {
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gl::BindVertexArray(self.solid_vertex_array.gl_vertex_array);
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gl::UseProgram(self.solid_program.program.gl_program);
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gl::Uniform2f(self.solid_program.framebuffer_size_uniform.location,
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self.framebuffer_size.width as GLfloat,
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self.framebuffer_size.height as GLfloat);
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gl::Uniform4f(self.solid_program.color_uniform.location,
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color.r as f32 * (1.0 / 255.0),
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color.g as f32 * (1.0 / 255.0),
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color.b as f32 * (1.0 / 255.0),
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color.a as f32 * (1.0 / 255.0));
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gl::BlendEquation(gl::FUNC_ADD);
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gl::BlendFunc(gl::ONE, gl::ONE_MINUS_SRC_ALPHA);
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gl::Enable(gl::BLEND);
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gl::DrawElements(gl::TRIANGLES, 6, gl::UNSIGNED_INT, ptr::null());
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gl::Disable(gl::BLEND);
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}
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}
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fn draw_text(&self, string: &str, origin: &Point2D<i16>) {
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let mut next = *origin;
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let char_count = string.chars().count();
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let mut vertex_data = Vec::with_capacity(char_count * 4);
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let mut index_data = Vec::with_capacity(char_count * 6);
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for mut character in string.chars() {
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if !self.font.characters.contains_key(&character) {
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character = '?';
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}
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let info = &self.font.characters[&character];
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let position_rect =
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Rect::new(Point2D::new(next.x - info.origin_x, next.y - info.origin_y),
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Size2D::new(info.width as i16, info.height as i16));
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let tex_coord_rect = Rect::new(Point2D::new(info.x, info.y),
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Size2D::new(info.width, info.height));
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let first_vertex_index = vertex_data.len();
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vertex_data.extend_from_slice(&[
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DebugFontVertex::new(position_rect.origin, tex_coord_rect.origin),
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DebugFontVertex::new(position_rect.top_right(), tex_coord_rect.top_right()),
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DebugFontVertex::new(position_rect.bottom_right(), tex_coord_rect.bottom_right()),
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DebugFontVertex::new(position_rect.bottom_left(), tex_coord_rect.bottom_left()),
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]);
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index_data.extend(QUAD_INDICES.iter().map(|&i| i + first_vertex_index as u32));
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next.x += info.advance;
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}
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self.font_vertex_array
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.vertex_buffer
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.upload(&vertex_data, BufferTarget::Vertex, BufferUploadMode::Dynamic);
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self.font_vertex_array
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.index_buffer
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.upload(&index_data, BufferTarget::Index, BufferUploadMode::Dynamic);
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unsafe {
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gl::BindVertexArray(self.font_vertex_array.gl_vertex_array);
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gl::UseProgram(self.font_program.program.gl_program);
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gl::Uniform2f(self.font_program.framebuffer_size_uniform.location,
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self.framebuffer_size.width as GLfloat,
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self.framebuffer_size.height as GLfloat);
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gl::Uniform2f(self.font_program.font_texture_size_uniform.location,
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self.font_texture.size.width as GLfloat,
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self.font_texture.size.height as GLfloat);
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self.font_texture.bind(0);
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gl::Uniform1i(self.font_program.font_texture_uniform.location, 0);
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gl::BlendEquation(gl::FUNC_ADD);
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gl::BlendFunc(gl::ONE, gl::ONE_MINUS_SRC_ALPHA);
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gl::Enable(gl::BLEND);
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gl::DrawElements(gl::TRIANGLES,
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index_data.len() as GLsizei,
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gl::UNSIGNED_INT,
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ptr::null());
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gl::Disable(gl::BLEND);
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}
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}
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}
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struct DebugFontVertexArray {
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gl_vertex_array: GLuint,
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vertex_buffer: Buffer,
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index_buffer: Buffer,
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}
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impl DebugFontVertexArray {
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fn new(debug_font_program: &DebugFontProgram) -> DebugFontVertexArray {
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let vertex_buffer = Buffer::new();
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let index_buffer = Buffer::new();
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let mut gl_vertex_array = 0;
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unsafe {
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let position_attr = VertexAttr::new(&debug_font_program.program, "Position");
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let tex_coord_attr = VertexAttr::new(&debug_font_program.program, "TexCoord");
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gl::GenVertexArrays(1, &mut gl_vertex_array);
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gl::BindVertexArray(gl_vertex_array);
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gl::UseProgram(debug_font_program.program.gl_program);
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gl::BindBuffer(gl::ARRAY_BUFFER, vertex_buffer.gl_buffer);
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position_attr.configure_float(2,
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gl::UNSIGNED_SHORT,
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false,
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DEBUG_FONT_VERTEX_SIZE,
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0,
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0);
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tex_coord_attr.configure_float(2,
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gl::UNSIGNED_SHORT,
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false,
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DEBUG_FONT_VERTEX_SIZE,
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4,
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0);
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gl::BindBuffer(gl::ELEMENT_ARRAY_BUFFER, index_buffer.gl_buffer);
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}
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DebugFontVertexArray { gl_vertex_array, vertex_buffer, index_buffer }
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}
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}
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impl Drop for DebugFontVertexArray {
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#[inline]
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fn drop(&mut self) {
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unsafe {
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gl::DeleteVertexArrays(1, &mut self.gl_vertex_array);
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}
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}
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}
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struct DebugSolidVertexArray {
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gl_vertex_array: GLuint,
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vertex_buffer: Buffer,
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index_buffer: Buffer,
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}
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impl DebugSolidVertexArray {
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fn new(debug_solid_program: &DebugSolidProgram) -> DebugSolidVertexArray {
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let vertex_buffer = Buffer::new();
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let index_buffer = Buffer::new();
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let mut gl_vertex_array = 0;
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unsafe {
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let position_attr = VertexAttr::new(&debug_solid_program.program, "Position");
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gl::GenVertexArrays(1, &mut gl_vertex_array);
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gl::BindVertexArray(gl_vertex_array);
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gl::UseProgram(debug_solid_program.program.gl_program);
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gl::BindBuffer(gl::ARRAY_BUFFER, vertex_buffer.gl_buffer);
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position_attr.configure_float(2,
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gl::UNSIGNED_SHORT,
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false,
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DEBUG_SOLID_VERTEX_SIZE,
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0,
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0);
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gl::BindBuffer(gl::ELEMENT_ARRAY_BUFFER, index_buffer.gl_buffer);
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}
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DebugSolidVertexArray { gl_vertex_array, vertex_buffer, index_buffer }
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}
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}
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impl Drop for DebugSolidVertexArray {
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#[inline]
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fn drop(&mut self) {
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unsafe {
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gl::DeleteVertexArrays(1, &mut self.gl_vertex_array);
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}
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}
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}
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struct DebugFontProgram {
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program: Program,
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framebuffer_size_uniform: Uniform,
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font_texture_size_uniform: Uniform,
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font_texture_uniform: Uniform,
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}
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impl DebugFontProgram {
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fn new() -> DebugFontProgram {
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let program = Program::new("debug_font");
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let framebuffer_size_uniform = Uniform::new(&program, "FramebufferSize");
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let font_texture_size_uniform = Uniform::new(&program, "FontTextureSize");
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let font_texture_uniform = Uniform::new(&program, "FontTexture");
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DebugFontProgram {
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program,
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framebuffer_size_uniform,
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font_texture_size_uniform,
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font_texture_uniform,
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}
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}
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}
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struct DebugSolidProgram {
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program: Program,
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framebuffer_size_uniform: Uniform,
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color_uniform: Uniform,
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}
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impl DebugSolidProgram {
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fn new() -> DebugSolidProgram {
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let program = Program::new("debug_solid");
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let framebuffer_size_uniform = Uniform::new(&program, "FramebufferSize");
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let color_uniform = Uniform::new(&program, "Color");
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DebugSolidProgram { program, framebuffer_size_uniform, color_uniform }
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}
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}
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#[derive(Clone, Copy)]
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#[allow(dead_code)]
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struct DebugFontVertex {
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position_x: i16,
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position_y: i16,
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tex_coord_x: u16,
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tex_coord_y: u16,
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}
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impl DebugFontVertex {
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fn new(position: Point2D<i16>, tex_coord: Point2D<u16>) -> DebugFontVertex {
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DebugFontVertex {
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position_x: position.x,
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position_y: position.y,
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tex_coord_x: tex_coord.x,
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tex_coord_y: tex_coord.y,
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}
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}
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}
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#[derive(Clone, Copy)]
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#[allow(dead_code)]
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struct DebugSolidVertex {
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position_x: i16,
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position_y: i16,
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|
}
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impl DebugSolidVertex {
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|
fn new(position: Point2D<i16>) -> DebugSolidVertex {
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|
DebugSolidVertex { position_x: position.x, position_y: position.y }
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|
}
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|
}
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fn duration_ms(time: Duration) -> f64 {
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time.as_secs() as f64 * 1000.0 + time.subsec_nanos() as f64 / 1000000.0
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}
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