EnderTheCoder
70d4beca4f
- ra3.webgl: a Web peer of Vulkan/Direct3D (SDL3 canvas + GLES3/WebGL2), with 2D blit and the GPU terrain raymarch; GLSL ES shaders; null fallback off Emscripten. backend::webgl + default_backend() (webgl under Emscripten). - Emscripten toolchain + Dockerfile.wasm + scripts/build-wasm.sh; import std, global -fexceptions, and Asyncify so the blocking frame loop yields to the browser (display::sleep_frame calls emscripten_sleep). - apps/web/shell.html + apps/web/serve.py (Range-capable dev server). - Assets: browsers forbid synchronous on-demand reads on the main thread (and FS.createLazyFile / the WasmFS fetch backend are worker-only; SDL3's Emscripten backend is main-thread DOM only, so the engine cannot run in a worker). The wasm build therefore preloads a compact per-map set via OPENRA3_WEB_ASSETS. - New openra3 textures --map ID lists the loose terrain TGAs a map resolves to (terrain::resolve_texture_files, shared with load_textures_from_dir). - Fixes: webgl heightmap used GL_R16 = 0x8229 (that is R8) -> upload rejected, terrain flattened to water; now 0x822A. Logger uses a stdout console sink on the web (stderr maps to console.error); a GL error check logs bad uploads. - CI: wasm image + build jobs.
47 lines
2.4 KiB
CMake
47 lines
2.4 KiB
CMake
# WebAssembly cross-build via Emscripten.
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#
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# Includes Emscripten's own platform toolchain (found through $EMSDK, set by the
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# emsdk image / `emsdk_env.sh`) and then layers the project's requirements:
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#
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# * C++26 `import std;`. Emscripten ships the libc++ `std` module source and a
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# modules.json in its sysroot; its toolchain wires that up, but only if
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# `CMAKE_CXX_MODULE_STD` is on and no std-modules JSON has been set yet, so
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# both are arranged before Emscripten.cmake is included and before the
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# compiler is probed.
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# * Global `-fexceptions`. Emscripten disables exceptions by default, and the
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# libc++ `std` module must be built with the same setting as its consumers,
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# or clang rejects the prebuilt module ("configuration mismatch"). The engine
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# throws, so exceptions are enabled everywhere.
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# * The SDL3 web port (`-sUSE_SDL=3`) is attached by CMake to the SDL interface
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# target, not here, so only the targets that use SDL pay for it.
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# `import std` support: the gate and the module switch must be in place before
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# Emscripten.cmake runs and before the compiler is probed.
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set(CMAKE_EXPERIMENTAL_CXX_IMPORT_STD "d0edc3af-4c50-42ea-a356-e2862fe7a444")
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set(CMAKE_CXX_MODULE_STD ON)
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# Let Emscripten.cmake point CMake at its own sysroot modules.json.
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unset(CMAKE_CXX_STDLIB_MODULES_JSON)
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if(DEFINED ENV{EMSDK})
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set(OPENRA3_EMSCRIPTEN_CMAKE "$ENV{EMSDK}/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake")
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elseif(DEFINED ENV{EMSCRIPTEN_ROOT})
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set(OPENRA3_EMSCRIPTEN_CMAKE "$ENV{EMSCRIPTEN_ROOT}/cmake/Modules/Platform/Emscripten.cmake")
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endif()
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if(NOT EXISTS "${OPENRA3_EMSCRIPTEN_CMAKE}")
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message(FATAL_ERROR "Emscripten.cmake not found (set EMSDK); looked at '${OPENRA3_EMSCRIPTEN_CMAKE}'")
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endif()
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include("${OPENRA3_EMSCRIPTEN_CMAKE}")
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# Exceptions are used by the engine; keep them on globally so the std module and
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# its consumers agree.
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#
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# Asyncify turns `emscripten_sleep` (used by display::sleep_frame on Emscripten)
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# into a yield to the browser: the engine's frame loops are blocking, and
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# without yielding the page freezes and never paints.
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set(CMAKE_CXX_FLAGS_INIT "-fexceptions -sASYNCIFY=1")
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set(CMAKE_C_FLAGS_INIT "-sASYNCIFY=1")
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set(CMAKE_EXE_LINKER_FLAGS_INIT
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"-fexceptions -sDISABLE_EXCEPTION_CATCHING=0 -sALLOW_MEMORY_GROWTH=1 -sASYNCIFY=1")
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set(CMAKE_SHARED_LINKER_FLAGS_INIT
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"-fexceptions -sDISABLE_EXCEPTION_CATCHING=0 -sALLOW_MEMORY_GROWTH=1 -sASYNCIFY=1")
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