Add `SceneInfo::main_light`. #282

	name: ci-push
	on:
	push:
	branches:
	- '*'
	jobs:
	format-check:
	runs-on: ubuntu-24.04
	steps:
	- uses: actions/checkout@v4
	- name: update-alternatives
	run: sudo update-alternatives --install /usr/bin/clang-format clang-format /usr/bin/clang-format-18 100
	- name: format code
	run: scripts/format_code.sh
	- name: check diff
	run: .github/format_check_diff.sh
	build-linux:
	runs-on: ubuntu-24.04
	steps:
	- uses: actions/checkout@v4
	- name: init
	run: \|
	sudo apt update -yqq && sudo apt install -yqq ninja-build xorg-dev
	sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-14 100
	sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-14 100
	- name: configure gcc
	run: cmake -S . --preset=default -B build -DLEVK_USE_FREETYPE=OFF -DCAPO_USE_OPENAL=OFF
	- name: configure clang
	run: cmake -S . --preset=ninja-clang -B clang -DLEVK_USE_FREETYPE=OFF -DCAPO_USE_OPENAL=OFF
	- name: build gcc
	run: cmake --build build --config=Release -- -d explain
	- name: build clang
	run: cmake --build clang --config=Release
	- name: test
	run: cd build && ctest -C Release
	build-windows:
	runs-on: windows-latest
	steps:
	- uses: actions/checkout@v4
	- name: configure
	run: cmake -S . --preset=vs22 -B build -DLEVK_USE_FREETYPE=OFF -DCAPO_USE_OPENAL=OFF
	- name: build
	run: cmake --build build --config=Release
	- name: test
	run: cd build && ctest -C Release

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