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|
use std::collections::HashMap;
use crate::{context, texture, shader};
use glow::HasContext;
pub const CHAR_WIDTH: i32 = 7;
pub const CHAR_HEIGHT: i32 = 9;
pub const FONT_WIDTH: i32 = 112;
pub const FONT_HEIGHT: i32 = 54;
pub struct Bitmap {
pub shader: shader::Shader,
pub font: texture::Texture,
}
impl Bitmap {
pub fn new(ctx: &context::Context) -> Self {
let shader = shader::Shader::new_nolib(
&ctx,
include_str!("assets/shaders/bitmap/vert.glsl"),
include_str!("assets/shaders/bitmap/frag.glsl"),
);
let font = texture::Texture::new(ctx, include_bytes!("assets/fonts/simple.png"));
Self {
shader,
font,
}
}
pub fn render_text_helper(&self, ctx: &context::Context, pos: &glam::Vec2, text: &str, color: &glam::Vec3) {
let mut width = 0;
let mut linewidth = 0;
let mut height = CHAR_HEIGHT;
for c in text.chars() {
if c == '\n' {
width = width.max(linewidth);
linewidth = 0;
height += CHAR_HEIGHT;
} else {
linewidth += CHAR_WIDTH;
}
}
width = width.max(linewidth);
self.shader.bind(ctx);
let len = text.len().min(256);
self.shader.set_i32(ctx, "text_length", len as _);
let textvals: Vec<i32> = text.as_bytes().into_iter().take(len).map(|b| {
*b as i32
}).collect();
self.shader.set_i32_array(ctx, "text[0]", &textvals);
self.shader.set_i32(ctx, "char_width", CHAR_WIDTH as _);
self.shader.set_i32(ctx, "char_height", CHAR_HEIGHT as _);
self.shader.set_i32(ctx, "font_width", FONT_WIDTH as _);
self.shader.set_i32(ctx, "font_height", FONT_HEIGHT as _);
self.shader.set_i32(ctx, "text_width", width as _);
self.shader.set_i32(ctx, "text_height", height as _);
self.shader.set_vec3(ctx, "text_color", color as _);
self.shader.set_mat4(
ctx, "view",
&glam::Mat4::from_scale(
glam::Vec3::new(
2.0 / context::RENDER_WIDTH,
2.0 / context::RENDER_HEIGHT,
1.0,
),
),
);
let halfwidth = width as f32 / 2.0;
let halfheight = height as f32 / 2.0;
self.shader.set_mat4(
ctx, "position",
&glam::Mat4::from_scale_rotation_translation(
glam::Vec3::new(halfwidth, halfheight, 1.0),
glam::Quat::IDENTITY,
glam::Vec3::new(
-context::RENDER_WIDTH / 2.0 + pos.x + halfwidth,
context::RENDER_HEIGHT / 2.0 - pos.y - halfheight,
0.0,
),
)
);
self.font.bind(ctx);
ctx.render_no_geometry();
}
pub fn render_text(&self, ctx: &context::Context, pos: &glam::Vec2, text: &str) {
self.render_text_helper(ctx, pos, text, &glam::Vec3::new(1.0, 1.0, 1.0));
}
}
pub struct AtlasInfo {
pub pos: usize,
}
pub struct TrueType {
pub shader: shader::Shader,
pub font: fontdue::Font,
pub atlas: texture::Texture,
pub atlaswidth: usize,
pub cellwidth: usize,
pub cellheight: usize,
pub info: HashMap<char, AtlasInfo>,
}
impl TrueType {
pub fn new(ctx: &context::Context) -> Self {
let shader = shader::Shader::new_nolib(
&ctx,
include_str!("assets/shaders/truetype/vert.glsl"),
include_str!("assets/shaders/truetype/frag.glsl"),
);
let size = 20.0;
let font = fontdue::Font::from_bytes(
include_bytes!("assets/fonts/ComicNeue-Regular.ttf") as &[u8],
fontdue::FontSettings::default(),
).expect("failed to load font");
let mut chardata = HashMap::new();
for ci in 0..128 {
if let Some(c) = char::from_u32(ci) {
if !c.is_ascii_graphic() { continue; }
let res = font.rasterize(c, size);
chardata.insert(c, res);
}
}
let mut cellwidth = 0;
let mut cellbase = 0;
let mut cellextra = 0;
for (_, (m, _)) in &chardata {
if m.width > cellwidth { cellwidth = m.width }
if m.height > cellbase { cellbase = m.height }
let extra = (-m.ymin.min(0)) as usize;
if extra > cellextra { cellextra = extra }
}
let mut cellheight = cellbase + cellextra;
cellwidth = cellwidth.next_power_of_two();
cellheight = cellheight.next_power_of_two();
let atlaswidth = (chardata.len() * cellwidth).next_power_of_two();
let mut info = HashMap::new();
let mut atlas_bmp: Vec<u8> = vec![0; atlaswidth * cellheight];
for (i, (c, (m, bmp))) in chardata.iter().enumerate() {
let by = ((cellbase as i32) - (m.height as i32) - m.ymin) as usize;
let bx = cellwidth * i;
info.insert(*c, AtlasInfo {
pos: cellwidth * i,
});
for x in 0..m.width {
for y in 0..m.height {
atlas_bmp[bx + x + (by + y) * atlaswidth] = bmp[x + y * m.width];
}
}
}
let atlas = texture::Texture::new_empty(ctx);
unsafe {
ctx.gl.bind_texture(glow::TEXTURE_2D, Some(atlas.tex));
ctx.gl.pixel_store_i32(glow::UNPACK_ALIGNMENT, 1);
ctx.gl.tex_image_2d(
glow::TEXTURE_2D,
0,
glow::R8 as i32,
atlaswidth as i32,
cellheight as i32,
0,
glow::RED,
glow::UNSIGNED_BYTE,
Some(&atlas_bmp),
);
ctx.gl.generate_mipmap(glow::TEXTURE_2D);
}
Self { shader, font, atlas, atlaswidth, cellwidth, cellheight, info, }
}
pub fn render_text(&self, ctx: &context::Context, pos: &glam::Vec2, text: &str) {
self.shader.bind(ctx);
unsafe {
ctx.gl.active_texture(glow::TEXTURE0);
ctx.gl.bind_texture(glow::TEXTURE_2D, Some(self.atlas.tex));
}
self.shader.set_mat4(
ctx, "view",
&glam::Mat4::from_scale(
glam::Vec3::new(
2.0 / context::RENDER_WIDTH,
2.0 / context::RENDER_HEIGHT,
1.0,
),
),
);
let width = text.len() * self.cellwidth;
self.shader.set_mat4(
ctx, "position",
&glam::Mat4::from_scale_rotation_translation(
glam::Vec3::new(width as f32 / 2.0, self.cellheight as f32 / 2.0, 1.0),
glam::Quat::IDENTITY,
glam::Vec3::new(
-context::RENDER_WIDTH / 2.0 + pos.x + width as f32 / 2.0,
context::RENDER_HEIGHT / 2.0 - pos.y - self.cellheight as f32 / 2.0,
0.0,
),
)
);
let len = text.len().min(256);
let textvals: Vec<i32> = text.chars().take(len).map(|c| {
if let Some(i) = self.info.get(&c) {
i.pos as i32
} else {
0
}
}).collect();
self.shader.set_i32_array(ctx, "text[0]", &textvals);
self.shader.set_i32(ctx, "atlas_width", self.atlaswidth as i32);
self.shader.set_i32(ctx, "cell_width", self.cellwidth as i32);
self.shader.set_i32(ctx, "text_width", width as i32);
ctx.render_no_geometry();
}
}
|
