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Replace stb_truetype with FreeType for proper text outline rendering

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- Add -sUSE_FREETYPE=1 to Emscripten build flags
- Extend Font class with FT_Library, FT_Face, and FT_Stroker handles
- Rewrite FontAtlas to use FreeType with on-demand stroked glyph loading
- Text outlines now use FT_Stroker for vector-based stroking before
  rasterization, eliminating gaps at corners with thick outlines
- Use glTexSubImage2D for incremental atlas updates (major perf fix)
- Disable canvas border in shell.html per Emscripten docs (alignment fix)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
John McCardle 2026-01-31 16:45:10 -05:00
commit 67aa413a78
5 changed files with 538 additions and 128 deletions
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6
CMakeLists.txt
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@ -283,12 +283,14 @@ if(EMSCRIPTEN)
-sFULL_ES2=1
-sMIN_WEBGL_VERSION=2
-sMAX_WEBGL_VERSION=2
-sUSE_FREETYPE=1
)
# SDL2 flags are also needed at compile time for headers
# SDL2 and FreeType flags are also needed at compile time for headers
target_compile_options(mcrogueface PRIVATE
-sUSE_SDL=2
-sUSE_FREETYPE=1
)
message(STATUS "Emscripten SDL2 options enabled: -sUSE_SDL=2 -sFULL_ES2=1")
message(STATUS "Emscripten SDL2 options enabled: -sUSE_SDL=2 -sFULL_ES2=1 -sUSE_FREETYPE=1")
endif()
target_link_options(mcrogueface PRIVATE ${EMSCRIPTEN_LINK_OPTIONS})