132 lines
4.1 KiB
Zig
132 lines
4.1 KiB
Zig
const std = @import("std");
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const mach = @import("mach");
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const gpu = mach.gpu;
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pub const name = .app;
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pub const Mod = mach.Mod(@This());
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pub const local_events = .{
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.init = .{ .handler = init },
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.deinit = .{ .handler = deinit },
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.tick = .{ .handler = tick },
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};
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title_timer: mach.Timer,
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pipeline: *gpu.RenderPipeline,
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pub fn deinit(core: *mach.Core.Mod, game: *Mod) void {
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game.state().pipeline.release();
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core.send(.deinit, .{});
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}
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fn init(game: *Mod, core: *mach.Core.Mod) !void {
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// Create our shader module
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const shader_module = core.state().device.createShaderModuleWGSL("shader.wgsl", @embedFile("shader.wgsl"));
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defer shader_module.release();
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// Blend state describes how rendered colors get blended
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const blend = gpu.BlendState{};
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// Color target describes e.g. the pixel format of the window we are rendering to.
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const color_target = gpu.ColorTargetState{
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.format = core.get(core.state().main_window, .framebuffer_format).?,
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.blend = &blend,
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};
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// Fragment state describes which shader and entrypoint to use for rendering fragments.
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const fragment = gpu.FragmentState.init(.{
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.module = shader_module,
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.entry_point = "frag_main",
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.targets = &.{color_target},
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});
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// Create our render pipeline that will ultimately get pixels onto the screen.
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const label = @tagName(name) ++ ".init";
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const pipeline_descriptor = gpu.RenderPipeline.Descriptor{
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.label = label,
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.fragment = &fragment,
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.vertex = gpu.VertexState{
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.module = shader_module,
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.entry_point = "vertex_main",
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},
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};
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const pipeline = core.state().device.createRenderPipeline(&pipeline_descriptor);
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// Store our render pipeline in our module's state, so we can access it later on.
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game.init(.{
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.title_timer = try mach.Timer.start(),
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.pipeline = pipeline,
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});
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try updateWindowTitle(core);
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}
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// TODO(important): remove need for returning an error here
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fn tick(core: *mach.Core.Mod, game: *Mod) !void {
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// TODO(important): event polling should occur in mach.Core module and get fired as ECS event.
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// TODO(Core)
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var iter = mach.core.pollEvents();
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while (iter.next()) |event| {
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switch (event) {
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.close => core.send(.exit, .{}), // Tell mach.Core to exit the app
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else => {},
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}
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}
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// Grab the back buffer of the swapchain
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// TODO(Core)
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const back_buffer_view = mach.core.swap_chain.getCurrentTextureView().?;
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defer back_buffer_view.release();
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// Create a command encoder
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const label = @tagName(name) ++ ".tick";
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const encoder = core.state().device.createCommandEncoder(&.{ .label = label });
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defer encoder.release();
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// Begin render pass
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const sky_blue_background = gpu.Color{ .r = 0.776, .g = 0.988, .b = 1, .a = 1 };
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const color_attachments = [_]gpu.RenderPassColorAttachment{.{
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.view = back_buffer_view,
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.clear_value = sky_blue_background,
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.load_op = .clear,
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.store_op = .store,
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}};
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const render_pass = encoder.beginRenderPass(&gpu.RenderPassDescriptor.init(.{
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.label = label,
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.color_attachments = &color_attachments,
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}));
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// Draw
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render_pass.setPipeline(game.state().pipeline);
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render_pass.draw(3, 1, 0, 0);
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// Finish render pass
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render_pass.end();
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// Submit our commands to the queue
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var command = encoder.finish(&.{ .label = label });
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defer command.release();
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core.state().queue.submit(&[_]*gpu.CommandBuffer{command});
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// Present the frame
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core.send(.present_frame, .{});
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// update the window title every second
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if (game.state().title_timer.read() >= 1.0) {
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game.state().title_timer.reset();
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try updateWindowTitle(core);
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}
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}
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fn updateWindowTitle(core: *mach.Core.Mod) !void {
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try mach.Core.printTitle(
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core,
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core.state().main_window,
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"core-custom-entrypoint [ {d}fps ] [ Input {d}hz ]",
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.{
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// TODO(Core)
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mach.core.frameRate(),
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mach.core.inputRate(),
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},
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);
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core.send(.update, .{});
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}
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