feat: add field indexing example

noengine-cpp-field-indexing/.bazelignore

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+.git
+

noengine-cpp-field-indexing/.bazelrc

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+startup --windows_enable_symlinks
+common --enable_bzlmod
+common --registry=https://raw.githubusercontent.com/ecsact-dev/bazel_registry/main
+common --registry=https://raw.githubusercontent.com/bazelboost/registry/main
+common --registry=https://raw.githubusercontent.com/zaucy/bazel-central-registry/add-curl-config2 # temporary
+common --registry=https://bcr.bazel.build
+build --enable_platform_specific_config
+build --incompatible_enable_cc_toolchain_resolution
+build --incompatible_strict_action_env
+build --enable_runfiles
+build --noincompatible_remove_rule_name_parameter
+query --noincompatible_remove_rule_name_parameter
+
+build [email protected]//:use_std_fs
+query [email protected]//:use_std_fs
+build [email protected]//:use_std_fs
+query [email protected]//:use_std_fs
+
+try-import %workspace%/user.bazelrc
+

noengine-cpp-field-indexing/.bazelversion

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+7.x
+

noengine-cpp-field-indexing/.clang-format

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+AccessModifierOffset: -2
+AlignAfterOpenBracket: BlockIndent
+AlignConsecutiveAssignments: false
+AlignConsecutiveDeclarations: true
+AlignEscapedNewlines: Left
+AlignOperands: DontAlign
+AlignTrailingComments: false
+AllowAllArgumentsOnNextLine: false
+AllowAllParametersOfDeclarationOnNextLine: false
+AllowShortBlocksOnASingleLine: false
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: None
+AllowShortIfStatementsOnASingleLine: WithoutElse
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: true
+AlwaysBreakTemplateDeclarations: Yes
+BinPackArguments: false
+BinPackParameters: false
+BraceWrapping:
+  AfterClass: false
+  AfterControlStatement: false
+  AfterEnum: false
+  AfterFunction: false
+  AfterNamespace: false
+  AfterStruct: false
+  AfterUnion: false
+  AfterExternBlock: false
+  BeforeCatch: false
+  BeforeElse: false
+  IndentBraces: false
+  SplitEmptyFunction: false
+  SplitEmptyRecord: false
+  SplitEmptyNamespace: false
+BreakAfterJavaFieldAnnotations: false
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: Custom
+BreakBeforeInheritanceComma: false
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializers: BeforeComma
+BreakConstructorInitializersBeforeComma: false
+BreakStringLiterals: true
+ColumnLimit: 80
+CompactNamespaces: false
+ConstructorInitializerAllOnOneLineOrOnePerLine: false
+ConstructorInitializerIndentWidth: 2
+ContinuationIndentWidth: 2
+Cpp11BracedListStyle: true
+DerivePointerAlignment: false
+DisableFormat: false
+ExperimentalAutoDetectBinPacking: false
+FixNamespaceComments: true
+IncludeBlocks: Preserve
+IncludeIsMainRegex: "(Test)?$"
+IndentCaseLabels: true
+IndentPPDirectives: AfterHash
+IndentWidth: 2
+IndentWrappedFunctionNames: false
+InsertBraces: true
+JavaScriptQuotes: Leave
+JavaScriptWrapImports: true
+KeepEmptyLinesAtTheStartOfBlocks: false
+MacroBlockBegin: ""
+MacroBlockEnd: ""
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: None
+PackConstructorInitializers: NextLine
+PenaltyBreakAssignment: 10
+PenaltyBreakBeforeFirstCallParameter: 30
+PenaltyBreakComment: 10
+PenaltyBreakFirstLessLess: 0
+PenaltyBreakString: 10
+PenaltyExcessCharacter: 400
+PenaltyReturnTypeOnItsOwnLine: 350
+PointerAlignment: Left
+ReflowComments: true
+RequiresClausePosition: OwnLine
+SortIncludes: false
+SortUsingDeclarations: true
+SpaceAfterCStyleCast: false
+SpaceAfterLogicalNot: false
+SpaceAfterTemplateKeyword: false
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeCtorInitializerColon: true
+SpaceBeforeInheritanceColon: true
+SpaceBeforeParens: Never
+SpaceBeforeRangeBasedForLoopColon: true
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles: Never
+SpacesInContainerLiterals: false
+SpacesInCStyleCastParentheses: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+SeparateDefinitionBlocks: Always
+Standard: Latest
+TabWidth: 2
+UseTab: ForContinuationAndIndentation

noengine-cpp-field-indexing/.editorconfig

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+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+

noengine-cpp-field-indexing/.gitignore

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+bazel-*
+*.bazel.lock
+user.bazelrc
+/external
+/.cache
+

noengine-cpp-field-indexing/BUILD.bazel

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+load("@bazel_skylib//lib:selects.bzl", "selects")
+load("@rules_cc//cc:defs.bzl", "cc_binary")
+load("@rules_ecsact//ecsact:defs.bzl", "ecsact_binary", "ecsact_codegen")
+
+ecsact_codegen(
+    name = "ecsact_cpp_sources",
+    srcs = glob(["src/**/*.ecsact"]),
+    output_directory = "generated",
+    plugins = [
+        "@ecsact_lang_cpp//cpp_header_codegen",
+        "@ecsact_lang_cpp//cpp_systems_header_codegen",
+        "@ecsact_lang_cpp//systems_header_codegen",
+        "@ecsact_lang_cpp//cpp_systems_source_codegen",
+    ],
+)
+
+ecsact_binary(
+    name = "ecsact_runtime",
+    srcs = glob(["src/**/*.ecsact"]),
+    recipes = [
+        "@ecsact_rt_entt",
+    ],
+)
+
+cc_binary(
+    name = "ecsact-examples-noengine-cpp-sdl2",
+    srcs = glob(["src/**/*.cc", "src/**/*.hh"]) + [
+        ":ecsact_cpp_sources",
+    ],
+    copts = selects.with_or({
+        "@rules_cc//cc/compiler:clang": [
+            "-std=c++20",
+            "-fexperimental-library",
+        ],
+        ("@rules_cc//cc/compiler:msvc-cl", "@rules_cc//cc/compiler:clang-cl"): [
+            "/std:c++20",
+            "/permissive-",
+            "/Zc:preprocessor",
+        ],
+        "//conditions:default": [
+            "-std=c++20",
+        ],
+    }),
+    deps = [
+        ":ecsact_runtime",
+        "@sdl2",
+        "@sdl2//:sdl2_main",
+        "@cute_c2",
+        "@imgui",
+        "@imgui//backends:sdlrenderer2",
+        "@imgui//backends:sdl2",
+        "@ecsact_runtime//:core",
+        "@ecsact_lang_cpp//:support",
+        "@ecsact_lang_cpp//:execution_context",
+    ],
+)
+
+alias(
+    name = "example",
+    actual = ":ecsact-examples-noengine-cpp-sdl2",
+)

noengine-cpp-field-indexing/MODULE.bazel

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+module(name = "ecsact-examples-noengine-cpp-sdl2")
+
+bazel_dep(name = "rules_cc", version = "0.0.9")
+bazel_dep(name = "sdl2")
+bazel_dep(name = "toolchains_llvm", version = "1.0.0", dev_dependency = True)
+bazel_dep(name = "hedron_compile_commands", dev_dependency = True)
+bazel_dep(name = "ecsact_runtime", version = "0.6.2")
+bazel_dep(name = "bazel_skylib", version = "1.6.1")
+bazel_dep(name = "rules_ecsact", version = "0.5.2")
+bazel_dep(name = "ecsact_cli", version = "0.3.7")
+bazel_dep(name = "ecsact_lang_cpp", version = "0.4.1")
+bazel_dep(name = "boost.dll", version = "1.83.0.bzl.2")
+bazel_dep(name = "boost.process", version = "1.83.0.bzl.2")
+bazel_dep(name = "platforms", version = "0.0.10")
+bazel_dep(name = "ecsact_rt_entt", version = "0.3.2")
+bazel_dep(name = "cute_c2")
+bazel_dep(name = "imgui")
+
+archive_override(
+    module_name = "cute_c2",
+    integrity = "sha256-8RRKdXKWnbKziyQ6rKZcIJwsEuRk/q8WP9P1iFCOGfg=",
+    urls = ["https://github.com/seaube/bazel_cute_headers/releases/download/bazel-cute-headers-2024-05-16/bzlmod_cute_c2_1.10.tar.gz"],
+)
+
+git_override(
+    module_name = "imgui",
+    commit = "975821a9513e230601b358aea829b9659de13d11",
+    remote = "https://github.com/zaucy/imgui.git",
+)
+git_override(
+    module_name = "sdl2",
+    commit = "2c8acf0e46f14ebbafe3ec9cc05d7ee4b6d7609f",
+    remote = "https://github.com/zaucy/sdl.git",
+)
+git_override(
+    module_name = "ecsact_rt_entt",
+    commit = "5ed2115146a9f187dca3c0ff9f8c66fbea09bf23",
+    remote = "https://github.com/ecsact-dev/ecsact_rt_entt.git",
+)
+
+ecsact = use_extension("@rules_ecsact//ecsact:extensions.bzl", "ecsact", dev_dependency = True)
+ecsact.toolchain(use_ecsact_cli = True)
+use_repo(ecsact, "ecsact_toolchain")
+
+# TODO: https://github.com/bazelbuild/bazel-central-registry/pull/1916
+git_override(
+    module_name = "libarchive",
+    commit = "7c331f92acea5243c195cdc6fb46ecfa11ce1ce2",
+    remote = "https://github.com/zaucy/libarchive.git",
+)
+
+git_override(
+    module_name = "hedron_compile_commands",
+    commit = "204aa593e002cbd177d30f11f54cff3559110bb9",
+    remote = "https://github.com/hedronvision/bazel-compile-commands-extractor.git",
+)
+
+llvm = use_extension("@toolchains_llvm//toolchain/extensions:llvm.bzl", "llvm", dev_dependency = True)
+llvm.toolchain(llvm_version = "17.0.6")
+use_repo(llvm, "llvm_toolchain")
+
+register_toolchains(
+    "@llvm_toolchain//:all",
+    "@ecsact_toolchain//:all",
+    dev_dependency = True,
+)

noengine-cpp-field-indexing/README.md

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+Requirements for running this example:
+
+* [bazel](https://bazel.build/) (preferrably [bazelisk](https://github.com/bazelbuild/bazelisk))
+
+## Running Example
+
+```sh
+bazel run //:example -c opt
+```
+

noengine-cpp-field-indexing/WORKSPACE.bzlmod

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+

noengine-cpp-field-indexing/src/example.ecsact

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+main package example;
+
+component Health { f32 value; }
+component Position { f32 x; f32 y; }
+
+component Region { i32 x1; i32 y1; i32 x2; i32 y2; }
+component WithinRegion {
+    Region.x1 region_x1;
+    Region.y1 region_y1;
+    Region.x2 region_x2;
+    Region.y2 region_y2;
+}
+
+component InfluenceZone { f32 size; }
+component WithinInfluenceZone {
+  Position.x origin_x;
+  Position.y origin_y;
+  InfluenceZone.size radius;
+}
+
+component Tree;
+component Person { i32 seed; }
+component EvacuationProbe;
+
+component OnFire { f32 fuel; }
+component FireExtinguished;
+
+system SpreadFire {
+  readwrite OnFire;
+  readonly WithinInfluenceZone with (origin_x, origin_y, radius) {
+    adds OnFire;
+  }
+}
+
+system FireDamage {
+  readwrite OnFire;
+  readwrite Health;
+}
+
+system FireDiminish {
+  readwrite OnFire;
+  adds FireExtinguished;
+}
+
+system FireExtinguish {
+  include FireExtinguished;
+  removes OnFire;
+}
+
+action AddRegion {
+  i32 new_region_x1;
+  i32 new_region_y1;
+  i32 new_region_x2;
+  i32 new_region_y2;
+
+  include EvacuationProbe;
+  readwrite Position;
+
+  generates {
+    required Region;
+  }
+}
+
+system PersonMovementBehaviour {
+  readwrite Position;
+}
+
+system CalcWithinRegionParent(lazy) {
+  readonly Region;
+  system CalcWithinRegion {
+    readwrite WithinRegion;
+    readonly Position;
+  }
+}
+
+action EvacuateRegion {
+  i32 mouse_x;
+  i32 mouse_y;
+
+  include EvacuationProbe;
+  readwrite Position;
+}
+
+system StartEvacuation {
+  include EvacuationProbe;
+  readonly Position;
+  readonly WithinRegion;
+  notify onchange WithinRegion;
+}
+
+system Evacuate {
+  include EvacuationProbe;
+  readonly WithinRegion with (region_x1, region_y1, region_x2, region_y2) {
+    readwrite Position;
+    readwrite Health;
+  }
+}
+
+system RenderPeople {
+  include Person;
+  readonly Position;
+}
+
+system RenderEvacuationProbe {
+  include EvacuationProbe;
+  readonly Position;
+}