bold font rendering

src/Grid.zig

@@ -106,6 +106,7 @@ pub fn init(alloc: Allocator) !Grid {
     var fam = try font.Family.init(atlas);
     errdefer fam.deinit(alloc);
     try fam.loadFaceFromMemory(.regular, face_ttf, 32);
+    try fam.loadFaceFromMemory(.bold, face_bold_ttf, 32);
 
     // Load all visible ASCII characters and build our cell width based on
     // the widest character that we see.
@@ -310,13 +311,19 @@ pub fn updateCells(self: *Grid, term: Terminal) !void {
             // If the cell is empty then we draw nothing in the box.
             if (cell.empty()) continue;
 
+            // Determine our glyph styling
+            const style: font.Style = if (cell.attrs.bold == 1)
+                .bold
+            else
+                .regular;
+
             // Get our glyph
             // TODO: if we add a glyph, I think we need to rerender the texture.
-            const glyph = if (self.font_atlas.getGlyph(cell.char, .regular)) |glyph|
+            const glyph = if (self.font_atlas.getGlyph(cell.char, style)) |glyph|
                 glyph
             else glyph: {
                 self.atlas_dirty = true;
-                break :glyph try self.font_atlas.addGlyph(self.alloc, cell.char, .regular);
+                break :glyph try self.font_atlas.addGlyph(self.alloc, cell.char, style);
             };
 
             const fg = cell.fg orelse self.foreground;
@@ -509,4 +516,4 @@ test "GridSize update rounding" {
 }
 
 const face_ttf = @embedFile("../fonts/FiraCode-Regular.ttf");
-//const face_ttf = @embedFile("../fonts/Inconsolata-Regular.ttf");
+const face_bold_ttf = @embedFile("../fonts/FiraCode-Bold.ttf");

src/font/Family.zig

@@ -32,6 +32,7 @@ glyphs: std.AutoHashMapUnmanaged(GlyphKey, Glyph) = .{},
 /// The font faces representing all the styles in this family.
 /// These should be set directly or via various loader functions.
 regular: ?Face = null,
+bold: ?Face = null,
 
 /// This struct is used for the hash key for glyphs.
 const GlyphKey = struct {
@@ -55,6 +56,7 @@ pub fn deinit(self: *Family, alloc: Allocator) void {
     self.glyphs.deinit(alloc);
 
     if (self.regular) |*face| face.deinit();
+    if (self.bold) |*face| face.deinit();
 
     if (ftc.FT_Done_FreeType(self.ft_library) != ftok)
         log.err("failed to clean up FreeType", .{});
@@ -77,7 +79,7 @@ pub fn loadFaceFromMemory(
 
     @field(self, switch (style) {
         .regular => "regular",
-        .bold => unreachable,
+        .bold => "bold",
         .italic => unreachable,
         .bold_italic => unreachable,
     }) = face;
@@ -106,7 +108,7 @@ pub fn addGlyph(self: *Family, alloc: Allocator, v: anytype, style: Style) !*Gly
         // Real is the face we SHOULD use for this style.
         var real = switch (style) {
             .regular => self.regular,
-            .bold => unreachable,
+            .bold => self.bold,
             .italic => unreachable,
             .bold_italic => unreachable,
         };

src/terminal/Screen.zig

@@ -23,6 +23,7 @@ pub const Cell = struct {
     /// On/off attributes that can be set
     /// TODO: pack it
     attrs: struct {
+        bold: u1 = 0,
         inverse: u1 = 0,
     } = .{},
 

src/terminal/Terminal.zig

@@ -150,6 +150,10 @@ pub fn setAttribute(self: *Terminal, attr: sgr.Attribute) !void {
             self.cursor.pen.attrs = .{};
         },
 
+        .bold => {
+            self.cursor.pen.attrs.bold = 1;
+        },
+
         .inverse => {
             self.cursor.pen.attrs.inverse = 1;
         },