1 files changed, 133 insertions, 4 deletions

diff --git a/src/font.rs b/src/font.rs
index 393b1f5..fb8f133 100644
--- a/src/font.rs
+++ b/src/font.rs
@@ -1,21 +1,24 @@
+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 Font {
+pub struct Bitmap {
     pub shader: shader::Shader,
     pub font: texture::Texture,
 }
 
-impl Font {
+impl Bitmap {
     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"),
+            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 {
@@ -85,3 +88,129 @@ impl Font {
         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();
+    }
+}