ImGui wrapper

internal/imgui/imgui.go

@@ -0,0 +1,43 @@
+package imgui
+
+import (
+	"time"
+
+	cimgui "github.com/AllenDang/cimgui-go/imgui"
+)
+
+// ImGui context & IO wrapper
+type Context struct {
+	ctx *cimgui.Context
+	io  *cimgui.IO
+}
+
+func New() *Context {
+	ctx := cimgui.CreateContext()
+	cimgui.SetCurrentContext(ctx)
+	io := cimgui.CurrentIO()
+	return &Context{ctx: ctx, io: io}
+}
+
+func (c *Context) Destroy() {
+	cimgui.DestroyContext()
+}
+
+// Starts new ImGui frame
+// dt - time since last frame
+func (c *Context) BeginFrame(dt time.Duration, winW, winH int32) {
+	c.io.SetDeltaTime(float32(dt.Seconds()))
+	c.io.SetDisplaySize(cimgui.Vec2{X: float32(winW), Y: float32(winH)})
+	cimgui.NewFrame()
+}
+
+// Ends the frame, renders
+// and returns data for Vulkan
+func (c *Context) EndFrame() *cimgui.DrawData {
+	cimgui.EndFrame()
+	cimgui.Render()
+	return cimgui.CurrentDrawData()
+}
+
+// expose io to input backend
+func (c *Context) IO() *cimgui.IO { return c.io }