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4 commits

Author SHA1 Message Date
John McCardle
67aa413a78 Replace stb_truetype with FreeType for proper text outline rendering 
- 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>
 2026-01-31 16:45:10 -05:00
John McCardle
0811b76946 Fix FontAtlas texture deletion bug - text now renders in WebGL 
The FontAtlas class was missing move semantics, causing the GPU texture
to be deleted immediately after creation. When FontAtlas was moved into
the cache with std::move(), the default move constructor copied textureId_,
then the original's destructor deleted the texture the cache was using.

Added:
- Move constructor that transfers ownership and clears source textureId_
- Move assignment operator with proper cleanup of existing resources
- Deleted copy operations since GPU textures can't be shared

Also cleaned up the text fragment shader to use proper alpha sampling.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2026-01-31 13:54:48 -05:00
John McCardle
e08f189d60 Fix Text shader and RenderTexture viewport for SDL2 backend 
Text rendering fix:
- Add ShaderType parameter to drawTriangles() to allow explicit shader selection
- Text::draw() now properly uses text shader (alpha-only sampling)
- Previously drawTriangles() always overrode to sprite shader

RenderTexture fix:
- Add pushRenderState/popRenderState to save/restore viewport and projection
- RenderTexture::clear() now sets viewport/projection to FBO dimensions
- RenderTexture::display() restores previous state
- This fixes grid rendering which uses RenderTexture for tile chunks

Co-Authored-By: Claude <noreply@anthropic.com>
 2026-01-31 12:42:12 -05:00
John McCardle
c5cc022aa2 Add SDL2+OpenGL ES 2 renderer backend for Emscripten/WebGL 
Implements Phase 1 of renderer abstraction plan:
- SDL2Types.h: SFML-compatible type stubs in sf:: namespace
- SDL2Renderer.h/cpp: OpenGL ES 2 rendering implementation
- EmscriptenStubs.cpp: Stubs for missing POSIX functions (wait3, wait4, wcsftime)

Build system changes:
- Add MCRF_SDL2 compile-time backend selection
- Add Emscripten SDL2 link options (-sUSE_SDL=2, -sFULL_ES2=1)
- Fix LONG_BIT mismatch for Emscripten in pyport.h

Code changes for SDL2/headless compatibility:
- Guard ImGui includes with !MCRF_HEADLESS && !MCRF_SDL2
- Defer GL shader initialization until after context creation

Current status: Python runs in browser, rendering WIP (canvas sizing issues)

Build commands:
  emcmake cmake -DMCRF_SDL2=ON -B build-emscripten
  emmake make -C build-emscripten

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2026-01-31 11:13:15 -05:00