switch from capy to sokol + imgui

src/main.zig

@@ -1,20 +1,77 @@
-const std = @import("std");
-const capy = @import("capy");
+const ig = @import("cimgui");
+const sokol = @import("sokol");
+const slog = sokol.log;
+const sg = sokol.gfx;
+const sapp = sokol.app;
+const sglue = sokol.glue;
+const simgui = sokol.imgui;
 
-// This is required for your app to build to WebAssembly and other particular architectures
-pub usingnamespace capy.cross_platform;
+const state = struct {
+    var pass_action: sg.PassAction = .{};
+};
 
-pub fn main() !void {
-    try capy.backend.init();
+export fn init() void {
+    // initialize sokol-gfx
+    sg.setup(.{
+        .environment = sglue.environment(),
+        .logger = .{ .func = slog.func },
+    });
+    // initialize sokol-imgui
+    simgui.setup(.{
+        .logger = .{ .func = slog.func },
+    });
 
-    var window = try capy.Window.init();
-    try window.set(
-        capy.label(.{ .text = "Hello, World", .alignment = .Center }),
-    );
-
-    window.setTitle("Hello");
-    window.setPreferredSize(250, 100);
-    window.show();
-
-    capy.runEventLoop();
+    // initial clear color
+    state.pass_action.colors[0] = .{
+        .load_action = .CLEAR,
+        .clear_value = .{ .r = 0.0, .g = 0.5, .b = 1.0, .a = 1.0 },
+    };
+}
+
+export fn frame() void {
+    // call simgui.newFrame() before any ImGui calls
+    simgui.newFrame(.{
+        .width = sapp.width(),
+        .height = sapp.height(),
+        .delta_time = sapp.frameDuration(),
+        .dpi_scale = sapp.dpiScale(),
+    });
+
+    //=== UI CODE STARTS HERE
+    ig.igSetNextWindowPos(.{ .x = 10, .y = 10 }, ig.ImGuiCond_Once, .{ .x = 0, .y = 0 });
+    ig.igSetNextWindowSize(.{ .x = 400, .y = 100 }, ig.ImGuiCond_Once);
+    _ = ig.igBegin("Hello Dear ImGui!", 0, ig.ImGuiWindowFlags_None);
+    _ = ig.igColorEdit3("Background", &state.pass_action.colors[0].clear_value.r, ig.ImGuiColorEditFlags_None);
+    ig.igEnd();
+    //=== UI CODE ENDS HERE
+
+    // call simgui.render() inside a sokol-gfx pass
+    sg.beginPass(.{ .action = state.pass_action, .swapchain = sglue.swapchain() });
+    simgui.render();
+    sg.endPass();
+    sg.commit();
+}
+
+export fn cleanup() void {
+    simgui.shutdown();
+    sg.shutdown();
+}
+
+export fn event(ev: [*c]const sapp.Event) void {
+    // forward input events to sokol-imgui
+    _ = simgui.handleEvent(ev.*);
+}
+
+pub fn main() void {
+    sapp.run(.{
+        .init_cb = init,
+        .frame_cb = frame,
+        .cleanup_cb = cleanup,
+        .event_cb = event,
+        .window_title = "sokol-zig + Dear Imgui",
+        .width = 800,
+        .height = 600,
+        .icon = .{ .sokol_default = true },
+        .logger = .{ .func = slog.func },
+    });
 }