make the ecs subsystem be a separate module

build.zig

@@ -56,10 +56,16 @@ pub fn build(b: *std.Build) void {
     glfw.linkLibC();
 
     const mods = b.addModule("mods", .{
-	    .root_source_file = b.path("src/mods/mods.zig"),
-	    .target = target,
-	    .optimize = optimize,
-	});
+        .root_source_file = b.path("src/mods/mods.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+
+    const ecs = b.addModule("ecs", .{
+        .root_source_file = b.path("src/ecs/ecs.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
 
     const exe = b.addExecutable(.{
         .root_source_file = b.path("src/main.zig"),
@@ -68,9 +74,9 @@ pub fn build(b: *std.Build) void {
         .name = "sideros",
     });
     exe.root_module.addImport("mods", mods);
+    exe.root_module.addImport("ecs", ecs);
     exe.addIncludePath(b.path("ext/glfw/include"));
 
-
     exe.linkSystemLibrary("vulkan");
     compileAllShaders(b, exe);
     exe.linkLibrary(glfw);
@@ -78,25 +84,25 @@ pub fn build(b: *std.Build) void {
 
     b.installArtifact(exe);
 
-	// TODO: This does not generate documentation correctly?
+    // TODO: This does not generate documentation correctly?
     const install_docs = b.addInstallDirectory(.{
-	    .source_dir = exe.getEmittedDocs(),
-	    .install_dir = .prefix,
-	    .install_subdir = "docs",
+        .source_dir = exe.getEmittedDocs(),
+        .install_dir = .prefix,
+        .install_subdir = "docs",
     });
     const docs_step = b.step("docs", "Generate documentation");
     docs_step.dependOn(&install_docs.step);
 
-	// NOTE: This is a hack to generate documentation
+    // NOTE: This is a hack to generate documentation
     const mods_lib = b.addStaticLibrary(.{
-	    .root_module = mods,
-	    .name = "mods",
+        .root_module = mods,
+        .name = "mods",
     });
     const mods_docs = b.addInstallDirectory(.{
-	    .source_dir = mods_lib.getEmittedDocs(),
-	    .install_dir = .prefix,
-	    .install_subdir = "docs/mods",
-	});
+        .source_dir = mods_lib.getEmittedDocs(),
+        .install_dir = .prefix,
+        .install_subdir = "docs/mods",
+    });
     docs_step.dependOn(&mods_docs.step);
 
     const run_cmd = b.addRunArtifact(exe);

src/ecs/ecs.zig

@@ -0,0 +1,6 @@
+pub const components = @import("components.zig");
+const entities = @import("entities.zig");
+
+pub const Pool = entities.Pool;
+pub const System = *const fn (*Pool) void;
+pub const SystemGroup = []const System;

src/main.zig

@@ -6,14 +6,12 @@ const config = @import("config");
 const Renderer = @import("rendering/renderer_vulkan.zig");
 const math = @import("math.zig");
 const mods = @import("mods");
+const ecs = @import("ecs");
 
-const components = @import("ecs/components.zig");
-const entities = @import("ecs/entities.zig");
-
-fn testSystem2(pool: *entities.Pool) void {
-    for (pool.getQuery(components.Position), 0..) |position, i| {
-        const entity = pool.getEntity(i, components.Position);
-        if (pool.getComponent(entity, components.Speed)) |speed| {
+fn testSystem2(pool: *ecs.Pool) void {
+    for (pool.getQuery(ecs.components.Position), 0..) |position, i| {
+        const entity = pool.getEntity(i, ecs.components.Position);
+        if (pool.getComponent(entity, ecs.components.Speed)) |speed| {
             std.debug.print("entity{d}: {any},{any},{any} {any}\n", .{ i, position.x, position.y, position.z, speed.speed });
         }
     }
@@ -46,20 +44,20 @@ pub fn main() !void {
         const w = try window.Window.create(800, 600, "sideros");
         defer w.destroy();
 
-        var pool = try entities.Pool.init(allocator);
+        var pool = try ecs.Pool.init(allocator);
         defer pool.deinit(allocator);
 
         //try pool.addSystemGroup(&[_]entities.System{
         //    testSystem,
         //});
-        try pool.addSystemGroup(&[_]entities.System{
+        try pool.addSystemGroup(&[_]ecs.System{
             testSystem2,
         });
 
         for (0..1000) |_| {
             const entity = try pool.createEntity();
-            try pool.addComponent(entity, components.Position{ .x = 1.0, .y = 0.5, .z = 3.0 });
-            try pool.addComponent(entity, components.Speed{ .speed = 5.0 });
+            try pool.addComponent(entity, ecs.components.Position{ .x = 1.0, .y = 0.5, .z = 3.0 });
+            try pool.addComponent(entity, ecs.components.Speed{ .speed = 5.0 });
         }
 
         // TODO(luccie-cmd): Renderer.create shouldn't return an error

src/rendering/gltf.zig

@@ -0,0 +1,3 @@
+const std = @import("std");
+const mesh = @import("mesh.zig");
+const Allocator = std.mem.Allocator;