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FAQ and comments about the use of ImTextureID (#562, #561, #521, #510, #497, #475)

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ocornut 2016-03-24 11:06:57 +01:00
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imgui.cpp
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@ -266,7 +266,10 @@
It could be an identifier to your OpenGL texture (cast GLuint to void*), a pointer to your custom engine material (cast MyMaterial* to void*), etc.
At the end of the chain, your renderer takes this void* to cast it back into whatever it needs to select a current texture to render.
Refer to examples applications, where each renderer (in a imgui_impl_xxxx.cpp file) is treating ImTextureID as a different thing.
c++ tip: OpenGL uses integers to identify textures. You can safely store an integer into a void*, just cast it to void*, don't take it's address!
(c++ tip: OpenGL uses integers to identify textures. You can safely store an integer into a void*, just cast it to void*, don't take it's address!)
To display a custom image/texture within an ImGui window, you may use ImGui::Image(), ImGui::ImageButton(), ImDrawList::AddImage() functions.
ImGui will generate the geometry and draw calls using the ImTextureID that you passed and which your renderer can use.
It is your responsibility to get textures uploaded to your GPU.
Q: Can I have multiple widgets with the same label? Can I have widget without a label? (Yes)
A: Yes. A primer on the use of labels/IDs in ImGui..