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|
use super::{
InstanceData,
font::{self, CharAtlas},
image::ImageId,
texture::TextureWrapper,
};
use glam::{Mat2, Vec2};
use wgpu::Queue;
pub enum HorizontalAlign {
Left,
Center,
Right,
}
pub enum VerticalAlign {
Top,
Center,
Bottom,
}
pub struct Text {
pub text: String,
pub origin: Vec2,
pub scale: u32,
pub h_align: HorizontalAlign,
pub v_align: VerticalAlign,
}
pub struct Image {
pub id: ImageId,
pub origin: Vec2,
pub rotation: f32,
pub scale: Vec2,
pub uv_offset: Vec2,
pub uv_size: Vec2,
}
pub enum RenderCommand {
Text(Text),
Image(Image),
}
impl RenderCommand {
/// 描画コマンドからインスタンス情報に変換するメソッド
///
/// * screen_width - 画面幅
/// * screen_height - 画面高
/// * scale_factor - 画面拡大率
/// * queue - queue
/// * char_atlas - 文字テクスチャアトラス
/// * images - 画像テクスチャ
/// * buf - インスタンスバッファ
pub fn build(
&self,
screen_width: f32,
screen_height: f32,
scale_factor: f32,
queue: &Queue,
char_atlas: &mut CharAtlas,
images: &[TextureWrapper],
buf: &mut Vec<InstanceData>,
) {
match self {
RenderCommand::Text(text) => build_text(
text,
screen_width,
screen_height,
scale_factor,
queue,
char_atlas,
buf,
),
RenderCommand::Image(image) => {
build_image(image, screen_width, screen_height, images, buf)
}
}
}
}
fn build_text(
text: &Text,
screen_width: f32,
screen_height: f32,
scale_factor: f32,
queue: &Queue,
char_atlas: &mut CharAtlas,
buf: &mut Vec<InstanceData>,
) {
let scale = text.scale as f32;
let line_height = font::line_height(scale);
let line_count = text.text.matches('\n').count();
let height = line_height * line_count as f32 + font::height(scale);
let top = match text.v_align {
VerticalAlign::Top => text.origin.y,
VerticalAlign::Center => text.origin.y - height / 2.0,
VerticalAlign::Bottom => text.origin.y - height,
};
let mut baseline = top + font::ascent(scale);
for line in text.text.split('\n') {
// NOTE: ピクセル境界に合わせるため、整数にする。
// 最終的にRust側でNDCに変換するが、fragmentation時に整数に直る。
let y = (baseline * scale_factor).round() / scale_factor;
let start = buf.len();
let mut ox = 0.0;
let mut prev = None;
for c in line.chars() {
let ci = char_atlas.acquire(queue, c, scale);
if let Some(prev) = prev {
ox += font::kern(scale, prev, ci.glyph_id);
}
prev = Some(ci.glyph_id);
if ci.alloc_id.is_none() {
ox += font::h_advance(scale, ci.glyph_id);
continue;
}
// NOTE: ピクセル境界に合わせるため、整数にする。
// 最終的にRust側でNDCに変換するが、fragmentation時に整数に直る。
let x = (ox * scale_factor).round() / scale_factor;
let center_x = x + ci.x_offset + ci.width / 2.0;
let center_y = y + ci.y_offset + ci.height / 2.0;
buf.push(InstanceData {
transform: Mat2::from_diagonal(Vec2::new(
ci.width / screen_width * 2.0,
-ci.height / screen_height * 2.0,
)),
translation: Vec2::new(
center_x / screen_width * 2.0 - 1.0,
1.0 - center_y / screen_height * 2.0,
),
uv_offset: ci.uv_offset,
uv_size: ci.uv_size,
tex_id: u32::MAX,
_pad: 0,
});
ox += font::h_advance(scale, ci.glyph_id);
}
let left = match text.h_align {
HorizontalAlign::Left => text.origin.x,
HorizontalAlign::Center => text.origin.x - ox / 2.0,
HorizontalAlign::Right => text.origin.x - ox,
};
// NOTE: ピクセル境界に合わせるため、整数にする。
// 最終的にRust側でNDCに変換するが、fragmentation時に整数に直る。
let left = (left * scale_factor).round() / scale_factor;
for instance in &mut buf[start..] {
instance.translation.x += left / screen_width * 2.0;
}
baseline += line_height;
}
}
fn build_image(
image: &Image,
screen_width: f32,
screen_height: f32,
images: &[TextureWrapper],
buf: &mut Vec<InstanceData>,
) {
let texture = &images[image.id as usize];
let size = image.uv_size * Vec2::new(texture.width as f32, texture.height as f32) * image.scale;
let ndc = Vec2::new(2.0 / screen_width, -2.0 / screen_height);
buf.push(InstanceData {
transform: Mat2::from_diagonal(ndc) * Mat2::from_scale_angle(size, image.rotation),
translation: image.origin * ndc + Vec2::new(-1.0, 1.0),
uv_offset: image.uv_offset,
uv_size: image.uv_size,
tex_id: image.id as u32,
_pad: 0,
});
}
|
