update README.md

README.md

@@ -17,6 +17,10 @@ Notes:
 * All naming is algorithmic except for those names that were coded in cimgui_overloads table (https://github.com/cimgui/cimgui/blob/master/generator/generator.lua#L60). In the official version this table is empty.
 * Current overloaded function names can be found in (https://github.com/cimgui/cimgui/blob/master/generator/output/overloads.txt)
 
+#changes
+
+* 10/11/2025: Functions returning and taking as argument no POD structs is now doing a conversion internally to allow ARM64 compilation.
+
 # compilation
 
 * clone 
@@ -60,7 +64,8 @@ Notes:
   * retref : is set if original return type is a reference. (will be a pointer in cimgui)
   * argsT : an array of collections (each one with type: argument type and name: the argument name, when the argument is a function pointer also ret: return type and signature: the function signature)
   * args : a string of argsT concatenated and separated by commas
-  * call_args : a string with the argument names separated by commas for calling imgui function
+  * call_args_old : a string with the argument names separated by commas for calling imgui function
+  * call_args : call_args_old with conversion added.
   * defaults : a collection in which key is argument name and value is the default value.
   * manual : will be true if this function is hand-written (not generated)
   * skipped : will be true if this function is not generated (and not hand-written)
@@ -70,7 +75,7 @@ Notes:
   * realdestructor : is set if the function is a destructor for a class
   * templated : is set if the function belongs to a templated class (ImVector)
   * templatedgen: is set if the function belongs to a struct generated from template (ImVector_ImWchar)
-  * nonUDT : if present the original function was returning a user defined type so that signature has been changed to accept a pointer to the UDT as first argument.
+  * nonUDT : if present the original function was returning a user defined type.
   * location : name of the header file and linenumber this function comes from. (imgui:000, internal:123, imgui_impl_xxx:123)
   * is_static_function : is setted when it is an struct static function.
 ### structs_and_enums description
@@ -91,7 +96,6 @@ Notes:
 * use whatever method is in ImGui c++ namespace in the original [imgui.h](https://github.com/ocornut/imgui/blob/master/imgui.h) by prepending `ig`
 * methods have the same parameter list and return values (where possible)
 * functions that belong to a struct have an extra first argument with a pointer to the struct.
-* where a function returns UDT (user defined type) by value some compilers complain so the function is generated accepting a pointer to the UDT type as the first argument (or second if belongs to a struct).
 * constructors return pointer to struct and has been named Struct_name_Struct_name
 # usage with backends
 

cimgui.h

@@ -3818,7 +3818,6 @@ struct SDL_Window;
 typedef union SDL_Event SDL_Event;
 #endif // CIMGUI_DEFINE_ENUMS_AND_STRUCTS
 
-
 #ifdef CIMGUI_DEFINE_ENUMS_AND_STRUCTS
 typedef struct ImTextureRef_c ImTextureRef;
 typedef struct ImVec2_c ImVec2;
@@ -3860,6 +3859,8 @@ struct ImRect_c {
     ImVec2_c Max;
 };
 #endif
+
+
 #ifndef CIMGUI_DEFINE_ENUMS_AND_STRUCTS
 typedef struct ImGuiTextFilter::ImGuiTextRange ImGuiTextRange;
 typedef ImStb::STB_TexteditState STB_TexteditState;

generator/cimgui_template.h

@@ -49,6 +49,7 @@ struct SDL_Window;
 typedef union SDL_Event SDL_Event;
 #endif // CIMGUI_DEFINE_ENUMS_AND_STRUCTS
 
+PLACE_STRUCTS_C
 
 #include "auto_funcs.h"
 

generator/cpp2ffi.lua

@@ -1104,12 +1104,13 @@ local function get_nonPOD(FP)
 	return nonPOD
 end
 local function recur_calc_depth(FP, structs, k,n)
+	--print("recur_calc_depth",k,n)
 	local struct = structs[k]
 	local n1 = n
 	for i,field in ipairs(struct) do
 		local typ = field.type:gsub("const ","") 
 		typ = typ:gsub("*","")
-		if FP.nP_used[typ] then
+		if k~=typ and FP.nP_used[typ] then
 			n1 = math.max(n1,recur_calc_depth(FP, structs, typ,n+1))
 		end
 	end
@@ -1163,12 +1164,16 @@ local function gen_structs_c(FP)
 	return table.concat(tabs_c,"\n").."\n"..table.concat(tabs,"\n")
 	--return table.concat(tabs,"\n")
 end
-local function gen_field_conversion(tab, struct, FP, prefix)
+local function gen_field_conversion(tab, struct, FP, to,prefix)
 	prefix = prefix or ""
 	local structs = FP.structs_and_enums_table.structs
 	for i,field in ipairs(struct) do
+		local ftype = field.type:gsub("*","")
 		if FP.nP_used[field.type] then
-			gen_field_conversion(tab, structs[field.type],FP, prefix..field.name..".")
+			gen_field_conversion(tab, structs[field.type],FP, to,prefix..field.name..".")
+		elseif FP.nP_used[ftype] then
+			local ftypec = field.type:gsub(ftype,not to and (ftype.."_c") or ftype)
+			insert(tab, "    dest."..prefix..field.name.." = reinterpret_cast<"..ftypec..">(src."..prefix..field.name..");")
 		else
 			insert(tab,"    dest."..prefix..field.name.." = src."..prefix..field.name..";")
 		end
@@ -1183,14 +1188,14 @@ local function genConversions(FP)
 		insert(convers,"{")
 		insert(convers,"    "..k.." dest;")
 		local struct = structs[k]
-		gen_field_conversion(convers,struct,FP)
+		gen_field_conversion(convers,struct,FP, true)
 		insert(convers,"    return dest;")
 		insert(convers,"}")
 		insert(convers,"static inline "..k.."_c ConvertFromCPP_"..k.."(const "..k.."& src)")
 		insert(convers,"{")
 		insert(convers,"    "..k.."_c dest;")
 		local struct = structs[k]
-		gen_field_conversion(convers,struct,FP)
+		gen_field_conversion(convers,struct,FP,  false)
 		insert(convers,"    return dest;")
 		insert(convers,"}")
 	end)
@@ -3128,8 +3133,8 @@ local function func_header_generate(FP)
     --outtabf = M.header_subs_nonPOD(FP,outtabf)
     local cfuncsstr = table.concat(outtab)..outtabf
     cfuncsstr = cfuncsstr:gsub("\n+","\n") --several empty lines to one empty line
-	local structs_c = FP:gen_structs_c()
-    return structs_c..cfuncsstr
+
+    return cfuncsstr
 end
 
 M.func_header_generate = func_header_generate

generator/generator.lua

@@ -286,7 +286,6 @@ local function cimgui_generation(parser)
 	
 
 	local  tdt = parser:generate_templates()
-	--local cstructsstr = "\n//7777estio es outpre\n"..outpre.."\n///////////////tdt\n"..tdt.."\n////////////////////outpost\n"..outpost 
 	local cstructsstr = outpre..tdt..outpost 
     
 	if gdefines.IMGUI_HAS_DOCK then
@@ -307,6 +306,7 @@ local function cimgui_generation(parser)
 	cstructsstr = colapse_defines(cstructsstr, "IMGUI_ENABLE_FREETYPE")
 	
     hstrfile = hstrfile:gsub([[#include "imgui_structs%.h"]],cstructsstr)
+	hstrfile = hstrfile:gsub([[PLACE_STRUCTS_C]],parser:gen_structs_c())
     local cfuncsstr = func_header_generate(parser)
 	cfuncsstr = colapse_defines(cfuncsstr, "IMGUI_ENABLE_FREETYPE")
     hstrfile = hstrfile:gsub([[#include "auto_funcs%.h"]],cfuncsstr)