Crashes after rendering a texture to ImGui.Image and ImGui.ImageButton

[RulHolos]

After loading a texture with Raylib.LoadTexture(), which Raylib loads correctly, my program crashes when rendering the frame with ImGui.Image(texture.Id, new(24, 24)) and ImGui.ImageButton(some_id, texture.Id, new(24, 24)), in ImGuiRaylib.cs at the method ImGuiRenderTriangles.

I'm not sure if this is a bug or if I am doing something wrong.
For the record, I'm getting my texture ID with : texture.Id, which I do think is the correct way to do it.

Creating a ImTextureID struct from the texture causes the same crash.

[RulHolos]

I'm using those versions of Hexa.NET.*

<ItemGroup>
  <PackageReference Include="DiscordRichPresence" Version="1.3.0.28" />
  <PackageReference Include="Hexa.NET.ImGui" Version="2.2.7" />
  <PackageReference Include="Hexa.NET.ImGui.Widgets" Version="1.2.13" />
  <PackageReference Include="Hexa.NET.ImGui.Widgets.Extras" Version="1.0.6" />
  <PackageReference Include="Hexa.NET.ImNodes" Version="2.2.7" />
  <PackageReference Include="Hexa.NET.ImPlot" Version="2.2.7" />
  <PackageReference Include="Hexa.NET.Math" Version="2.0.6" />
  <PackageReference Include="Hexa.NET.Raylib" Version="1.2.1" />
  <PackageReference Include="Hexa.NET.Utilities" Version="2.2.2" />
  <PackageReference Include="LibGit2Sharp" Version="0.31.0" />
  <PackageReference Include="LuaCSharp" Version="0.4.2" />
  <PackageReference Include="Microsoft.Data.Sqlite" Version="9.0.6" />
  <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
  <PackageReference Include="Serilog" Version="4.3.0" />
  <PackageReference Include="Serilog.Sinks.Console" Version="6.0.0" />
  <PackageReference Include="Serilog.Sinks.File" Version="7.0.0" />
  <PackageReference Include="sqlite-net-pcl" Version="1.9.172" />
  <PackageReference Include="Tomlyn" Version="0.19.0" />
  <PackageReference Include="YamlDotNet" Version="16.3.0" />
</ItemGroup>

I tried switching to 2.2.2 for ImGui (and other packages) as per the examples in the repo but that didn't work either.

[JunaMeinhold]

Hey, sorry for the late reply, how and what exactly are you passing in

ImGui.Image();

[RulHolos]

Here's a non-working example. EditorIcon is an image that I'm loading a bit before (which Raylib does succeed to load so I know it exists).

It's only an example (since showing the full call stack would be a bit too much in my case.)

Texture tex = Raylib.LoadTextureFromImage(EditorIcon);

ImGui.Image(tex.Id, new System.Numerics.Vector2(24, 24));

Raylib.UnloadTexture(tex);

I'm calling those lines after having initialized a Raylib window, the ImGui context and a NewFrame for ImGui, in the window drawing loop.

[JunaMeinhold]

Two solutions are available, first is to change the backend code to cast the pointer directly to a uint directly without the Texture* .. ->Id, when passing an texture id directly from raylib, or you pass &tex in Image

[JunaMeinhold]

And the texture must be alive until the current frame is drawn/ended

[RulHolos]

Casting the both the TexturePtr and Texture* to uint directly doesn't render anything in the window, just a black screen
As for passing &tex in Image, it's not possible, as Raylib.LoadTextureFromImage doesn't return a pointer, and I can't pass tex.Id as a pointer value.

[JunaMeinhold]

either do

// in backend
        private static void ImGuiRenderTriangles(uint count, uint indexStart, ImVector<ImDrawIdx>* indexBuffer, ImVector<ImDrawVert>* vertBuffer, void* texturePtr)
        {
            if (count < 3)
                return;

            uint textureId = (uint)texturePtr;
...


// in frontend
Texture tex = Raylib.LoadTextureFromImage(EditorIcon);
ImGui.Image(new(texId: tex.Id), ...); // note that texId: is only necessary in post ImGui 1.92

or do

// in backend
        private static void ImGuiRenderTriangles(uint count, uint indexStart, ImVector<ImDrawIdx>* indexBuffer, ImVector<ImDrawVert>* vertBuffer, void* texturePtr)
        {
            if (count < 3)
                return;

            Texture* texture = (Texture*)texturePtr;

            uint textureId = (texture == null) ? 0 : texture->Id;


// in frontend
Texture tex = Raylib.LoadTextureFromImage(EditorIcon);
ImGui.Image(new(texId: (ulong)&tex), ...); // note that texId: is only necessary in post ImGui 1.92, note yes this is only possible if your texture is heap allocated, i simplified here a lot