Add meson build system

.github/actions/meson_build/action.yml

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+name: 'Build Godot'
+description: 'Build Godot with the provided options'
+inputs:
+  buildtype:
+    description: 'The meson buildtype (debug/debugoptimized/optimized/minsize)'
+    required: true
+    default: 'debugoptimized'
+  tools:
+    description: 'If tools are to be built'
+    required: true
+    default: true
+  platform:
+    description: 'The Godot platform to build. This is currently unused'
+    required: false
+  meson:
+    description: 'The meson binary to run (in case we need upstream/downstram patches to the build system).'
+    required: true
+    default: 'meson'
+  destination:
+    required: true
+    default: 'builddir'
+  mesonflags:
+    default: ''
+runs:
+  using: "composite"
+  steps:
+    - name: Meson Configure
+      shell: bash
+      run: |
+          ${{ inputs.meson }} ${{ inputs.destination }} ${{ inputs.mesonflags }} -Dbuildtype=${{ inputs.buildtype }} -Dtools=${{ inputs.tools }}
+    - name: Meson compile
+      shell: bash
+      run: |
+          ${{ inputs.meson }} compile -C ${{ inputs.destination }}

.github/actions/meson_install/action.yml

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+name: 'Setup python meson ninja.'
+description: 'Setup python installation, and install pip version of meson and ninja.'
+inputs:
+  python-version:
+    description: 'The python version to use'
+    required: true
+    default: '3.x'
+  python-arch:
+    description: 'The python architecture'
+    required: true
+    default: 'x64'
+runs:
+  using: "composite"
+  steps:
+    # Use python 3.x release (works cross platform)
+    - name: Set up Python 3.x
+      uses: actions/setup-python@v2
+      with:
+        # Semantic version range syntax or exact version of a Python version
+        python-version: ${{ inputs.python-version }}
+        # Optional - x64 or x86 architecture, defaults to x64
+        architecture: ${{ inputs.python-arch }}
+    - name: Setup meson and ninja
+      shell: bash
+      run: |
+        python -c "import sys; print(sys.version)"
+        python -m pip install meson ninja
+        python --version
+        meson --version
+        ninja --version

.github/workflows/meson.yml

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+name: 💠 Meson Builds
+on: [push, pull_request]
+
+# Global Settings
+env:
+  GODOT_BASE_BRANCH: master
+  MESONFLAGS: ''
+  EM_VERSION: 2.0.27
+  EM_CACHE_FOLDER: 'emsdk-cache'
+
+concurrency:
+  group: ci-${{github.actor}}-${{github.head_ref || github.run_number}}-${{github.ref}}-meson
+  cancel-in-progress: true
+
+jobs:
+  meson:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - name: 🤖 Android (release, armv7a)
+            os: ubuntu-20.04
+            platform: android
+            target: release
+            tools: false
+            mesonflags: '--cross-file cross/android.gen.txt'
+            arch: armv7a
+
+          - name: 🤖 Android (release, armv64v8)
+            os: ubuntu-20.04
+            platform: android
+            target: release
+            tools: false
+            mesonflags: '--cross-file cross/android.gen.txt'
+            arch: aarch64
+
+          - name: 🍏 iOS (release)
+            os: macos-latest
+            platform: iphone
+            target: release
+            tools: false
+            mesonflags: '--cross-file cross/iphone.txt'
+
+          - name: 🌐 JavaScript (minsize)
+            os: ubuntu-20.04
+            platform: javascript
+            target: minsize
+            tools: false
+            meson: './meson-upstream/'
+            mesonflags: '--cross-file cross/emscripten -Dbuiltin_pcre2_with_jit=false'
+
+          - name: 🐧 Linux (debug, asan+ubsan, tests)
+            os: ubuntu-20.04
+            platform: linuxbsd
+            target: debug
+            tools: true
+            tests: true
+            mesonflags: -Dtests=true -Duse_asan=true -Duse_ubsan=true
+
+          - name: 🐧 Linux (release_debug, tests)
+            os: ubuntu-20.04
+            platform: linuxbsd
+            target: debugoptimized
+            tools: true
+            tests: true
+            mesonflags: -Dtests=true
+
+          - name: 🐧 Linux (release)
+            os: ubuntu-20.04
+            platform: linuxbsd
+            target: release
+            tools: false
+
+          - name: 🍎 macOS (release_debug, tests)
+            os: macos-latest
+            platform: osx
+            target: debugoptimized
+            tools: true
+            tests: true
+            mesonflags: -Dtests=true
+
+          - name: 🍎 macOS (release)
+            os: macos-latest
+            platform: osx
+            target: debugoptimized
+            tools: false
+
+          - name: 🏁 Windows (release_debug, tests)
+            os: windows-latest
+            platform: windows
+            target: debugoptimized
+            tools: true
+            tests: true
+            mesonflags: -Dtests=true
+
+          - name: 🏁 Windows (release)
+            os: windows-latest
+            platform: windows
+            target: release
+            tools: false
+
+    name: ${{ matrix.name }}
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Java 8
+        uses: actions/setup-java@v1
+        if: ${{ matrix.platform == 'android' }}
+        with:
+          java-version: 8
+
+      - name: Setup python and meson
+        uses: ./.github/actions/meson_install
+
+      - name: Generate meson cross compilation file (${{ matrix.arch }}).
+        if: ${{ matrix.platform == 'android' }}
+        run: |
+          python3 misc/scripts/make_android_cross.py "$ANDROID_NDK_ROOT" -m ${{ matrix.arch }} -o cross/android.gen.txt
+
+      # Additional cache for Emscripten generated system libraries
+      - name: Load Emscripten cache
+        id: javascript-template-emscripten-cache
+        if: ${{ matrix.platform == 'javascript' }}
+        uses: actions/cache@v2
+        with:
+          path: ${{env.EM_CACHE_FOLDER}}
+          key: ${{env.EM_VERSION}}-${{github.job}}
+
+      - name: Set up Emscripten ${{env.EM_VERSION}}
+        if: ${{ matrix.platform == 'javascript' }}
+        uses: mymindstorm/setup-emsdk@v10
+        with:
+          version: ${{env.EM_VERSION}}
+          actions-cache-folder: ${{env.EM_CACHE_FOLDER}}
+
+      - name: Verify Emscripten setup
+        if: ${{ matrix.platform == 'javascript' }}
+        run: |
+          emcc -v
+
+      # TODO remove once meson in pip is updated to master
+      - name: Download meson upstream branch (pip version does not support godot)
+        if: ${{ matrix.platform == 'javascript' }}
+        run: |
+          git clone https://github.com/mesonbuild/meson.git meson-upstream
+          cd meson-upstream
+          cp meson.py meson
+
+      # Azure repositories are not reliable, we need to prevent azure giving us packages.
+      - name: Make apt sources.list use the default Ubuntu repositories
+        if: ${{ matrix.platform == 'linuxbsd' }}
+        run: |
+          sudo rm -f /etc/apt/sources.list.d/*
+          sudo cp -f misc/ci/sources.list /etc/apt/sources.list
+          sudo apt-get update
+
+      # Install all packages (except scons)
+      - name: Configure dependencies
+        if: ${{ matrix.platform == 'linuxbsd' }}
+        run: |
+          sudo apt-get install build-essential pkg-config libx11-dev libxcursor-dev \
+            libxinerama-dev libgl1-mesa-dev libglu-dev libasound2-dev libpulse-dev libdbus-1-dev libudev-dev libxi-dev libxrandr-dev yasm \
+            xvfb wget unzip
+
+      - name: Setup MSVC.
+        if: ${{ matrix.platform == 'windows' }}
+        uses: ilammy/msvc-dev-cmd@v1
+        with:
+          arch: amd64
+
+      - name: Compilation (${{ matrix.platform }} ${{ matrix.arch }})
+        if: ${{ matrix.platform != 'windows' }}
+        uses: ./.github/actions/meson_build
+        with:
+          mesonflags: ${{ env.MESONFLAGS }} ${{ matrix.mesonflags }}
+          buildtype: ${{ matrix.target }}
+          meson: ${{ matrix.meson }}meson
+          tools: ${{ matrix.tools }}
+
+      # Differnt build for windows due to github/MSVC messing up shell vars.
+      - name: Meson configure (win)
+        if: ${{ matrix.platform == 'windows' }}
+        run: |
+          meson builddir ${{ env.MESONFLAGS }} ${{ matrix.mesonflags }} -Dbuildtype=${{ matrix.target }}  -Dtools=${{ matrix.tools }}
+
+      - name: Meson build (win)
+        if: ${{ matrix.platform == 'windows' }}
+        run: |
+          meson compile -C builddir
+
+      # Execute unit tests for the editor
+      - name: Unit Tests
+        if: ${{ matrix.tests && matrix.platform == 'linuxbsd' }}
+        run: |
+          ./builddir/godot --headless --test
+
+      #- name: Upload Artifact
+      #  uses: ./.github/actions/upload-artifact

core/config/meson.build

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+SOURCES += files(run_command(GLOB, '*.cpp').stdout().split('\n'))

core/core_builders.py

@@ -1,3 +1,5 @@
+#!/usr/bin/python3
+
 """Functions used to generate source files during build time
 
 All such functions are invoked in a subprocess on Windows to prevent build flakiness.

core/crypto/meson.build

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+SOURCES += files(run_command(GLOB, '*.cpp').stdout().split('\n'))

core/debugger/meson.build

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+SOURCES += files(run_command(GLOB, '*.cpp').stdout().split('\n'))

core/error/meson.build

@@ -0,0 +1 @@
+SOURCES += files(run_command(GLOB, '*.cpp').stdout().split('\n'))

core/extension/meson.build

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+SOURCES += files(run_command(GLOB, '*.cpp').stdout().split('\n'))

core/input/input_builders.py

@@ -1,3 +1,5 @@
+#!/usr/bin/python3
+
 """Functions used to generate source files during build time
 
 All such functions are invoked in a subprocess on Windows to prevent build flakiness.

core/input/meson.build

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+# generated input mappings
+_default_controller_mappings_target = custom_target(
+    'default_controller_mappings',
+    output: ['default_controller_mappings.gen.cpp'],
+    input: ['gamecontrollerdb.txt', 'godotcontrollerdb.txt'],
+    env: SCRIPTS_ENV,
+    command: [SCRIPT_COMPAT, 'make_default_controller_mappings', SCRIPT_INPUT_BUILDERS, '-i', '@INPUT@', '-o', '@OUTPUT@'],
+    build_by_default: true
+)
+
+SOURCES += [_default_controller_mappings_target]
+
+SOURCES += files(run_command(GLOB, '*.cpp').stdout().split('\n'))

core/io/meson.build

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+# generated certs
+
+_certs_target = custom_target(
+    'certs',
+    output: ['certs_compressed.gen.h'],
+    input: [meson.project_source_root() + '/thirdparty/certs/ca-certificates.crt'],
+    env: SCRIPTS_ENV,
+    command: [SCRIPT_COMPAT, 'make_certs_header', SCRIPT_CORE_BUILDERS, '-i', '@INPUT@', '-o', '@OUTPUT@', '-e',
+      'builtin_certs=' + (get_option('builtin_certs') ? 'true' : 'false'),
+      'system_certs_path=' + get_option('system_certs_path')],
+    build_by_default: true
+)
+
+SOURCES += [_certs_target]
+
+SOURCES += files(run_command(GLOB, '*.cpp').stdout().split('\n'))

core/math/meson.build

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+SOURCES += files(run_command(GLOB, '*.cpp').stdout().split('\n'))