add imgui_wrapper

.gitmodules

@@ -2,5 +2,5 @@
 	path = formats/mpq/stormlib
 	url = https://github.com/ladislav-zezula/StormLib.git
 [submodule "platform/imgui/cimgui"]
-	path = platform/imgui/cimgui
+	path = platform/imgui/imgui_wrapper/cimgui
 	url = https://github.com/cimgui/cimgui.git

platform/imgui/imgui_wrapper/imgui_wrapper.go

@@ -0,0 +1,44 @@
+package imgui
+
+// #define CIMGUI_DEFINE_ENUMS_AND_STRUCTS
+// #include "cimgui/cimgui.h"
+// #cgo linux LDFLAGS: -L./cimgui -l:cimgui.a -lstdc++ -lm
+import "C"
+import "unsafe"
+
+type Context = C.ImGuiContext
+type DrawData = C.ImDrawData
+type FontAtlas = C.ImFontAtlas
+type Io = C.ImGuiIO
+
+func CreateContext(fontAtlas *FontAtlas) *Context {
+	c := C.igCreateContext(fontAtlas)
+	return c
+}
+
+func (c *Context) Destroy() {
+	C.igDestroyContext(c)
+}
+
+func NewFrame() {
+	C.igNewFrame()
+}
+
+func Render() {
+	C.igRender()
+}
+
+func GetDrawData() *DrawData {
+	return C.igGetDrawData()
+}
+
+func GetIo() *Io {
+	return C.igGetIO()
+}
+
+func (fa *FontAtlas) GetTexDataAsRGBA32() (pixels unsafe.Pointer, width, height int32) {
+	var data *C.uint8_t
+	var w, h C.int
+	C.ImFontAtlas_GetTexDataAsRGBA32(fa, &data, &w, &h, nil)
+	return unsafe.Pointer(data), int32(w), int32(h)
+}