Mapping the buffer twice Exception on GL3+ & Vulkan Render Systems

[P-S-Y-S-U]

Hi, if I use "COLIBRI_MULTIPASS_SUPPORT" I get ""Mapping the buffer twice within the same frame detected! This is not allowed." exception on Vulkan and OpenGL3+ rendering systems.

Here's how i setup my compositor node ( check out the note on this ):

target rt_renderwindow
{
    pass render_scene
    {
        load
        {
            all clear
            clear_colour 1.0 1.0 1.0 1.0
        }
        store
        {
            all store_or_resolve
        }
        rq_first 6
        rq_last 7

        profiling_id "Bg Pass"
    }

    pass custom colibri_gui // Note: if i didn't define this custom pass i don't get any exception
    {
        skip_load_store_semantics false
        identifier 123
        profiling_id "Back Colibri GUI"
        aspect_ratio_mode keep_width
    }

    pass render_scene
    {
        skip_load_store_semantics true

        rq_first 7
        rq_last 200
        
        profiling_id "Main Objects Pass"
    }

    pass custom colibri_gui
    {
        skip_load_store_semantics false
        identifier 456
        profiling_id "Front Colibri GUI"
        aspect_ratio_mode keep_width
    }
}

[darksylinc]

Hi!

Could you post the callstack of the exception? Thanks

[P-S-Y-S-U]

OpenGL3+:

Vulkan:

is this enough?

[darksylinc]

Hi!

Are you by chance calling ColibriManager::update in a listener between the first and second Colibri pass?
I'm thinking that's the only reasonable explanation to trigger the exception.

[P-S-Y-S-U]

Yes. i was calling ColibriManager::update on each custom colibrigui pass.
i tried calling only one ColibriManager::update before Ogre::Root::renderOneFrame now it works.

Thanks

[P-S-Y-S-U]

I still don't understand how DirectX11 managed to overcome this though :P