Read kerning table (untested cause there ain't one)

src/Game.zig

@@ -449,7 +449,7 @@ pub fn init() !Game {
         .codepoint_ranges = &.{
             .{ .start = 32, .end = 127 },
         },
-        .name = "EB Garamond Regular",
+        .name = "Fira Mono",
     });
 
     // VOLATILE Load all assets before this point

src/engine/Font.zig

@@ -197,6 +197,9 @@ pub fn init(ttf_buffer: []const u8, init_info: InitInfo) !Font {
     errdefer codepoint_glyph_id.deinit(allocator_general);
     try codepoint_glyph_id.ensureTotalCapacity(allocator_general, glyph_count);
 
+    var external_glyph_id_to_cpu_glyph_id: std.hash_map.AutoHashMapUnmanaged(u16, u16) = .empty;
+    try external_glyph_id_to_cpu_glyph_id.ensureTotalCapacity(allocator_frame, glyph_count);
+
     var kerning_em: std.hash_map.AutoHashMapUnmanaged([2]u16, f32) = .empty;
     errdefer kerning_em.deinit(allocator_general);
 
@@ -227,8 +230,15 @@ pub fn init(ttf_buffer: []const u8, init_info: InitInfo) !Font {
         while (codepoint < range.end) : (codepoint += 1) {
             // std.debug.print("Processing codepoint 0x{X} '{u}'\n", .{ codepoint, codepoint });
             if (ttf_font.findGlyphIndex(codepoint)) |external_glyph_id| {
-                const cpu_glyph_id = @as(u16, @intCast(cpu_glyph_data.items.len));
-                codepoint_glyph_id.putAssumeCapacityNoClobber(codepoint, cpu_glyph_id);
+                const external_glyph_id_to_cpu_glyph_id_get_or_put_result = external_glyph_id_to_cpu_glyph_id.getOrPutAssumeCapacity(external_glyph_id);
+                if (external_glyph_id_to_cpu_glyph_id_get_or_put_result.found_existing) {
+                    codepoint_glyph_id.putAssumeCapacityNoClobber(codepoint, external_glyph_id_to_cpu_glyph_id_get_or_put_result.value_ptr.*);
+                    continue;
+                } else {
+                    const cpu_glyph_id = @as(u16, @intCast(cpu_glyph_data.items.len));
+                    external_glyph_id_to_cpu_glyph_id_get_or_put_result.value_ptr.* = cpu_glyph_id;
+                    codepoint_glyph_id.putAssumeCapacityNoClobber(codepoint, cpu_glyph_id);
+                }
 
                 const glyph_metrics = ttf_font.getGlyphMetrics(external_glyph_id);
                 // std.debug.print("    Advance: {d} U\n", .{glyph_metrics.advance_width});
@@ -374,6 +384,16 @@ pub fn init(ttf_buffer: []const u8, init_info: InitInfo) !Font {
         }
     }
 
+    var kerning_it = ttf_font.kerningTableIterator();
+    while (kerning_it.next()) |entry| {
+        if (external_glyph_id_to_cpu_glyph_id.contains(entry.glyph_prev) and external_glyph_id_to_cpu_glyph_id.contains(entry.glyph_next)) {
+            const advance_em = @as(f32, @floatFromInt(entry.advance)) * em_per_unit;
+            try kerning_em.put(allocator_general, .{ entry.glyph_prev, entry.glyph_next }, advance_em);
+        }
+    }
+
+    // std.debug.print("Kerning table size: {d}\n", .{kerning_em.size});
+
     var glyph_data: GenericBuffer(void, shaders.GlyphData) = try .init(.{
         .usage = .storage,
         .target_queue = .graphics,

src/engine/Gui.zig

@@ -605,11 +605,13 @@ pub fn printLine(self: *Gui, comptime fmt: []const u8, fmt_args: anytype, print_
 
         var cursor_offset_em = glyph_data.bottom_left_em;
         cursor_offset_em.y = -cursor_offset_em.y;
-        cursor_offset_em.x += glyph_data.left_side_bearing_em;
+        if (maybe_prev_glyph == null) {
+            cursor_offset_em.x += glyph_data.left_side_bearing_em;
+        }
 
         if (maybe_prev_glyph) |prev_glyph| {
             const kerning_em = font.kerning_em.get(.{ prev_glyph, glyph_id }) orelse 0;
-            cursor_offset_em.x += kerning_em;
+            cursor_sspx.x += kerning_em;
         }
 
         if (glyph_data.gpu_glyph_id) |gpu_glyph_id| {