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zig-bloxel-game
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WIP flecs-zig-ble new system init

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wip/new-system-init
copygirl 7 months ago
parent b1895bbef8
commit 8caf363d22
5 changed files with 150 additions and 147 deletions
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  1. 5
      .gitignore
  2. 4
      build.zig
  3. 75
      src/App.zig
  4. 211
      src/Renderer.zig
  5. 2
      src/primitives.zig

5
.gitignore vendored
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@ -3,5 +3,6 @@
/zig-out/ /zig-out/
# Dependencies (cloned manually) # Dependencies (cloned manually)
/libs/flecs-zig-ble/ # Could be symlinks, so not including trailing slash.
/libs/zig-gamedev/ /libs/flecs-zig-ble
/libs/zig-gamedev

4
build.zig
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@ -18,7 +18,7 @@ pub fn build(b: *std.Build) !void {
const app = try mach.CoreApp.init(b, mach_dep.builder, .{ const app = try mach.CoreApp.init(b, mach_dep.builder, .{
.name = "zig-bloxel-game", .name = "zig-bloxel-game",
.src = "src/main.zig", .src = "src/App.zig",
.target = target, .target = target,
.optimize = optimize, .optimize = optimize,
.deps = &.{ .deps = &.{
@ -36,7 +36,7 @@ pub fn build(b: *std.Build) !void {
run_step.dependOn(&app.run.step); run_step.dependOn(&app.run.step);
const unit_tests = b.addTest(.{ const unit_tests = b.addTest(.{
.root_source_file = .{ .path = "src/main.zig" }, .root_source_file = .{ .path = "src/App.zig" },
.target = target, .target = target,
.optimize = optimize, .optimize = optimize,
}); });

75
src/main.zig → src/App.zig
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@ -2,18 +2,15 @@ const std = @import("std");
const GeneralPurposeAllocator = std.heap.GeneralPurposeAllocator(.{}); const GeneralPurposeAllocator = std.heap.GeneralPurposeAllocator(.{});
const core = @import("mach").core; const core = @import("mach").core;
const Renderer = @import("./renderer.zig"); const Renderer = @import("./Renderer.zig");
const flecszigble = @import("flecs-zig-ble"); const flecszigble = @import("flecs-zig-ble");
const flecs = flecszigble.flecs;
const Context = flecszigble.Context(void); const Context = flecszigble.Context(void);
const World = Context.World; const World = Context.World;
const Iter = Context.Iter; const Iter = Context.Iter;
const flecs = flecszigble.flecs;
const OnLoad = flecs.pipeline.OnLoad;
const OnUpdate = flecs.pipeline.OnUpdate;
const OnStore = flecs.pipeline.OnStore;
pub const App = @This(); pub const App = @This();
gpa: GeneralPurposeAllocator, gpa: GeneralPurposeAllocator,
@ -57,14 +54,10 @@ pub fn init(app: *App) !void {
app.world = world; app.world = world;
// Create a singleton component for accessing the `App` from ECS. // Create a singleton component for accessing the `App` from ECS.
_ = try world.singleton("App", *App, app); _ = try world.singleton(*App, app);
// TODO: The way we register systems using flecs-zig-ble is still very WIP.
_ = try world.system("PollEvents", pollEvents, OnLoad, "App");
const s = try world.system("UpdateWindowTitle", updateWindowTitle, OnStore, ""); _ = try world.system(PollEvents);
// Set the update interval of the `UpdateWindowTitle` system to 1 second. _ = try world.system(UpdateWindowTitle);
_ = flecszigble.c.ecs_set_interval(world.raw, s.raw, 1.0);
app.renderer = try Renderer.init(app); app.renderer = try Renderer.init(app);
} }
@ -84,30 +77,36 @@ pub fn update(app: *App) !bool {
return !app.world.progress(0.0); return !app.world.progress(0.0);
} }
/// Read events from the OS such as input. /// System that reads events from the OS such as input.
pub fn pollEvents(it: Iter) void { pub const PollEvents = struct {
const app = it.field(*App, 1)[0]; pub const phase = flecs.pipeline.OnLoad;
pub const expr = "App($)";
var pollIter = core.pollEvents(); pub fn callback(world: *World, app: *const *App) void {
while (pollIter.next()) |event| { var pollIter = core.pollEvents();
switch (event) { while (pollIter.next()) |event| {
// Allow the renderer to act on the window being resized. switch (event) {
// This is required so we can resize necessary buffers. // Allow the renderer to act on the window being resized.
.framebuffer_resize => |_| app.renderer.resize(), // This is required so we can resize necessary buffers.
.framebuffer_resize => |_| app.*.renderer.resize(),
// Close the window when requested, such as when
// pressing the X button in the window title bar. // Close the window when requested, such as when
.close => it.world.quit(), // pressing the X button in the window title bar.
.close => world.quit(),
else => {},
else => {},
}
} }
} }
} };
/// Update the window title to show FPS and input frequency. /// System that updates the window title to show FPS and input frequency.
pub fn updateWindowTitle(_: Iter) void { pub const UpdateWindowTitle = struct {
core.printTitle( pub const phase = flecs.pipeline.OnStore;
"Triangle [ {d}fps ] [ Input {d}hz ]", pub const interval = 1.0; // Run only once a second.
.{ core.frameRate(), core.inputRate() }, pub fn callback(_: Iter) void {
) catch @panic("Title too long!"); core.printTitle(
} "Triangle [ {d}fps ] [ Input {d}hz ]",
.{ core.frameRate(), core.inputRate() },
) catch @panic("Title too long!");
}
};

211
src/renderer.zig → src/Renderer.zig
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@ -11,20 +11,19 @@ const zm = @import("zmath");
const vec = zm.f32x4; const vec = zm.f32x4;
const Mat = zm.Mat; const Mat = zm.Mat;
const App = @import("./main.zig"); const App = @import("./App.zig");
const primitives = @import("./primitives.zig"); const primitives = @import("./primitives.zig");
const VertexData = primitives.VertexData; const VertexData = primitives.VertexData;
const PrimitiveData = primitives.PrimitiveData; const PrimitiveData = primitives.PrimitiveData;
const flecszigble = @import("flecs-zig-ble"); const flecszigble = @import("flecs-zig-ble");
const flecs = flecszigble.flecs;
const Context = flecszigble.Context(void); const Context = flecszigble.Context(void);
const Entity = Context.Entity; const Entity = Context.Entity;
const Iter = Context.Iter; const Iter = Context.Iter;
const flecs = flecszigble.flecs;
const OnStore = flecs.pipeline.OnStore;
const Transform = struct { value: Mat }; const Transform = struct { value: Mat };
const CameraPerspective = struct { const CameraPerspective = struct {
/// Vertical field of view (in degrees). /// Vertical field of view (in degrees).
@ -231,8 +230,8 @@ pub fn init(app: *App) !*Renderer {
} }
// Register components necessary for the camera. // Register components necessary for the camera.
_ = try app.world.component("Transform", Transform); _ = try app.world.component(Transform);
_ = try app.world.component("CameraPerspective", CameraPerspective); _ = try app.world.component(CameraPerspective);
const camera_entity = try app.world.entity( const camera_entity = try app.world.entity(
.{ .name = "Camera", .symbol = "Camera" }, .{ .name = "Camera", .symbol = "Camera" },
@ -244,8 +243,7 @@ pub fn init(app: *App) !*Renderer {
.far_plane = 80.0, .far_plane = 80.0,
}); });
const render_expr = "App, [in] CameraPerspective(Camera), [out] Transform(Camera)"; _ = try app.world.system(Render);
_ = try app.world.system("Render", render, OnStore, render_expr);
const result = try app.allocator.create(Renderer); const result = try app.allocator.create(Renderer);
result.* = .{ result.* = .{
@ -293,105 +291,110 @@ pub fn resize(self: *Renderer) void {
self.recreateDepthTexture(); self.recreateDepthTexture();
} }
pub fn render(it: Iter) void { /// System which renders the game world from the camera entity's perspective.
const app = it.field(*App, 1)[0]; pub const Render = struct {
const camera_perspective = it.field(CameraPerspective, 2)[0]; pub const phase = flecs.pipeline.OnStore;
const camera_transform = &it.field(Transform, 3)[0]; pub const expr = "App($), [in] CameraPerspective(Camera), [out] Transform(Camera)";
pub fn callback(it: Iter) void {
const self = app.renderer; const app = it.field(*App, 1)[0];
self.time += it.deltaTime(); const camera_perspective = it.field(CameraPerspective, 2)[0];
const camera_transform = &it.field(Transform, 3)[0];
// Set up a view matrix from the camera transform.
// This moves everything to be relative to the camera. const self = app.renderer;
// TODO: Actually implement camera transform instead of hardcoding a look-at matrix. self.time += it.deltaTime();
// const view_matrix = zm.inverse(app.camera_transform);
const camera_distance = 8.0; // Set up a view matrix from the camera transform.
const x = @cos(self.time * std.math.tau / 20) * camera_distance; // This moves everything to be relative to the camera.
const z = @sin(self.time * std.math.tau / 20) * camera_distance; // TODO: Actually implement camera transform instead of hardcoding a look-at matrix.
const camera_pos = vec(x, 2.0, z, 1.0); // const view_matrix = zm.inverse(app.camera_transform);
const view_matrix = zm.lookAtLh(camera_pos, vec(0, 0, 0, 1), vec(0, 1, 0, 1)); const camera_distance = 8.0;
const x = @cos(self.time * std.math.tau / 20) * camera_distance;
// Setting the transform here doesn't do anything because it's not used const z = @sin(self.time * std.math.tau / 20) * camera_distance;
// anywhere. In the future we would want to set the camera transform const camera_pos = vec(x, 2.0, z, 1.0);
// outside of the rendering step, and then get and use it here, instead. const view_matrix = zm.lookAtLh(camera_pos, vec(0, 0, 0, 1), vec(0, 1, 0, 1));
camera_transform.* = .{ .value = view_matrix };
// TODO: Not sure if this is the proper transform, or actually inverted. // Setting the transform here doesn't do anything because it's not used
// anywhere. In the future we would want to set the camera transform
// Set up a projection matrix using the size of the window. // outside of the rendering step, and then get and use it here, instead.
// The perspective projection will make things further away appear smaller. camera_transform.* = .{ .value = view_matrix };
const width: f32 = @floatFromInt(core.descriptor.width); // TODO: Not sure if this is the proper transform, or actually inverted.
const height: f32 = @floatFromInt(core.descriptor.height);
const proj_matrix = zm.perspectiveFovLh( // Set up a projection matrix using the size of the window.
std.math.degreesToRadians(f32, camera_perspective.field_of_view), // The perspective projection will make things further away appear smaller.
width / height, const width: f32 = @floatFromInt(core.descriptor.width);
camera_perspective.near_plane, const height: f32 = @floatFromInt(core.descriptor.height);
camera_perspective.far_plane, const proj_matrix = zm.perspectiveFovLh(
); std.math.degreesToRadians(f32, camera_perspective.field_of_view),
width / height,
const view_proj_matrix = zm.mul(view_matrix, proj_matrix); camera_perspective.near_plane,
camera_perspective.far_plane,
// Get back buffer texture to render to. );
const back_buffer_view = core.swap_chain.getCurrentTextureView().?;
defer back_buffer_view.release(); const view_proj_matrix = zm.mul(view_matrix, proj_matrix);
// Once rendering is done (hence `defer`), swap back buffer to the front to display.
defer core.swap_chain.present(); // Get back buffer texture to render to.
const back_buffer_view = core.swap_chain.getCurrentTextureView().?;
const render_pass_info = gpu.RenderPassDescriptor.init(.{ defer back_buffer_view.release();
.color_attachments = &.{.{ // Once rendering is done (hence `defer`), swap back buffer to the front to display.
.view = back_buffer_view, defer core.swap_chain.present();
.clear_value = std.mem.zeroes(gpu.Color),
.load_op = .clear, const render_pass_info = gpu.RenderPassDescriptor.init(.{
.store_op = .store, .color_attachments = &.{.{
}}, .view = back_buffer_view,
.depth_stencil_attachment = &.{ .clear_value = std.mem.zeroes(gpu.Color),
.view = self.depth_texture_view.?, .load_op = .clear,
.depth_load_op = .clear, .store_op = .store,
.depth_store_op = .store, }},
.depth_clear_value = 1.0, .depth_stencil_attachment = &.{
}, .view = self.depth_texture_view.?,
}); .depth_load_op = .clear,
.depth_store_op = .store,
// Create a `WGPUCommandEncoder` which provides an interface for recording GPU commands. .depth_clear_value = 1.0,
const encoder = core.device.createCommandEncoder(null); },
defer encoder.release(); });
// Write to the scene uniform buffer for this set of commands. // Create a `WGPUCommandEncoder` which provides an interface for recording GPU commands.
encoder.writeBuffer(self.view_proj_buffer, 0, &[_]zm.Mat{ const encoder = core.device.createCommandEncoder(null);
// All matrices the GPU has to work with need to be transposed, defer encoder.release();
// because WebGPU uses column-major matrices while zmath is row-major.
zm.transpose(view_proj_matrix), // Write to the scene uniform buffer for this set of commands.
}); encoder.writeBuffer(self.view_proj_buffer, 0, &[_]zm.Mat{
// All matrices the GPU has to work with need to be transposed,
{ // because WebGPU uses column-major matrices while zmath is row-major.
const pass = encoder.beginRenderPass(&render_pass_info); zm.transpose(view_proj_matrix),
defer pass.release(); });
defer pass.end();
{
pass.setPipeline(self.pipeline); const pass = encoder.beginRenderPass(&render_pass_info);
pass.setBindGroup(0, self.camera_bind_group, &.{}); defer pass.release();
defer pass.end();
for (self.object_data) |object| {
// Set the vertex and index buffer used to render this pass.setPipeline(self.pipeline);
// object to the ones from the primitive it wants to use. pass.setBindGroup(0, self.camera_bind_group, &.{});
const prim = object.primitive;
pass.setVertexBuffer(0, prim.vertex_buffer, 0, prim.vertex_count * @sizeOf(VertexData)); for (self.object_data) |object| {
pass.setIndexBuffer(prim.index_buffer, .uint32, 0, prim.index_count * @sizeOf(u32)); // Set the vertex and index buffer used to render this
// object to the ones from the primitive it wants to use.
// Set the bind group for the object we want to render. const prim = object.primitive;
pass.setBindGroup(1, object.model_bind_group, &.{}); pass.setVertexBuffer(0, prim.vertex_buffer, 0, prim.vertex_count * @sizeOf(VertexData));
pass.setIndexBuffer(prim.index_buffer, .uint32, 0, prim.index_count * @sizeOf(u32));
// Draw a number of triangles as specified in the index buffer.
pass.drawIndexed(prim.index_count, 1, 0, 0, 0); // Set the bind group for the object we want to render.
pass.setBindGroup(1, object.model_bind_group, &.{});
// Draw a number of triangles as specified in the index buffer.
pass.drawIndexed(prim.index_count, 1, 0, 0, 0);
}
} }
}
// Finish recording commands, creating a `WGPUCommandBuffer`. // Finish recording commands, creating a `WGPUCommandBuffer`.
var command = encoder.finish(null); var command = encoder.finish(null);
defer command.release(); defer command.release();
// Submit the command(s) to the GPU. // Submit the command(s) to the GPU.
core.queue.submit(&.{command}); core.queue.submit(&.{command});
} }
};
/// Loads a texture from the provided buffer and uploads it to the GPU. /// Loads a texture from the provided buffer and uploads it to the GPU.
pub fn loadTexture(allocator: std.mem.Allocator, buffer: []const u8) !*gpu.TextureView { pub fn loadTexture(allocator: std.mem.Allocator, buffer: []const u8) !*gpu.TextureView {

2
src/primitives.zig
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@ -3,7 +3,7 @@ const tau = std.math.tau;
const gpu = @import("mach").core.gpu; const gpu = @import("mach").core.gpu;
const Renderer = @import("./renderer.zig"); const Renderer = @import("./Renderer.zig");
const createAndWriteBuffer = Renderer.createAndWriteBuffer; const createAndWriteBuffer = Renderer.createAndWriteBuffer;
/// Describes the layout of each vertex that a primitive is made of. /// Describes the layout of each vertex that a primitive is made of.

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