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use crate::{context, texture, shader};
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 Font {
pub shader: shader::Shader,
pub font: texture::Texture,
}
impl Font {
pub fn new(ctx: &context::Context) -> Self {
let shader = shader::Shader::new_nolib(
&ctx,
include_str!("assets/shaders/text/vert.glsl"),
include_str!("assets/shaders/text/frag.glsl"),
);
let font = texture::Texture::new(ctx, include_bytes!("assets/fonts/simple.png"));
Self {
shader,
font,
}
}
pub fn render_text(&self, ctx: &context::Context, pos: &glam::Vec2, text: &str) {
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_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();
}
}
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