1 files changed, 119 insertions, 0 deletions
diff --git a/src/main.zig b/src/main.zig
new file mode 100644
index 0000000..92e1da5
--- /dev/null
+++ b/src/main.zig
@@ -0,0 +1,119 @@
+const use_docking = @import("build_options").docking;
+const ig = if (use_docking) @import("cimgui_docking") else @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;
+
+const shd = @import("shader/quad.glsl.zig");
+
+const state = struct {
+    var bind: sg.Bindings = .{};
+    var pip: sg.Pipeline = .{};
+    var pass_action: sg.PassAction = .{};
+    var show_first_window: bool = true;
+    var show_second_window: bool = true;
+};
+
+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 },
+    });
+    if (use_docking) {
+        ig.igGetIO().*.ConfigFlags |= ig.ImGuiConfigFlags_DockingEnable;
+    }
+
+    // a vertex buffer
+    state.bind.vertex_buffers[0] = sg.makeBuffer(.{
+        .data = sg.asRange(&[_]f32{
+            // positions      colors
+            -0.5, 0.5,  0.5, 1.0, 0.0, 0.0, 1.0,
+            0.5,  0.5,  0.5, 0.0, 1.0, 0.0, 1.0,
+            0.5,  -0.5, 0.5, 0.0, 0.0, 1.0, 1.0,
+            -0.5, -0.5, 0.5, 1.0, 1.0, 0.0, 1.0,
+        }),
+    });
+
+    // an index buffer
+    state.bind.index_buffer = sg.makeBuffer(.{
+        .usage = .{ .index_buffer = true },
+        .data = sg.asRange(&[_]u16{ 0, 1, 2, 0, 2, 3 }),
+    });
+
+    // a shader and pipeline state object
+    state.pip = sg.makePipeline(.{
+        .shader = sg.makeShader(shd.quadShaderDesc(sg.queryBackend())),
+        .layout = init: {
+            var l = sg.VertexLayoutState{};
+            l.attrs[shd.ATTR_quad_position].format = .FLOAT3;
+            l.attrs[shd.ATTR_quad_color0].format = .FLOAT4;
+            break :init l;
+        },
+        .index_type = .UINT16,
+    });
+
+    // 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(),
+    });
+
+    if (ig.igBegin("Hello Dear ImGui!", &state.show_first_window, ig.ImGuiWindowFlags_None)) {
+        _ = ig.igColorEdit3("Background", &state.pass_action.colors[0].clear_value.r, ig.ImGuiColorEditFlags_None);
+        _ = ig.igText("Dear ImGui Version: %s", ig.IMGUI_VERSION);
+        ig.igEnd();
+    }
+
+
+    // call simgui.render() inside a sokol-gfx pass
+    sg.beginPass(.{ .action = state.pass_action, .swapchain = sglue.swapchain() });
+    sg.applyPipeline(state.pip);
+    sg.applyBindings(state.bind);
+    sg.draw(0, 6, 1);
+    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 },
+    });
+}