Option to configure CommandBufferQueue size.

[roxlu]

I'm rendering a scene with ~3000 items that share ~100 meshes and it seems that the CommandBufferQueue is running out of space. In Allocators.h I see the buffer sizes, but I'm wondering how to change the size; or maybe there is another way to render 3000 items?

[romainguy]

I talked to @pixelflinger and this is pretty much what we wanted to add. It was just never a priority so far. We'd love a test scene if you have one (a glTF file would work great if that's not a problem for you).

[pixelflinger]

I had to increase CONFIG_PER_RENDER_PASS_ARENA_SIZE to 3 MiB, CONFIG_PER_FRAME_COMMANDS_SIZE to 2 MiB and CONFIG_MIN_COMMAND_BUFFERS_SIZE to 3 MiB to be able to render a ~3400 items scene.

We will make this user-settable at Engine creation time eventually. Also maybe we could increase the defaults a bit.

[roxlu]

I want to look into this and wondering how we can make the buffer sizes configurable. I've looked into some files and found the following buffer sizes which should be configurable. In Allocators.h we have:

• CONFIG_PER_RENDER_PASS_ARENA_SIZE
• CONFIG_PER_FRAME_COMMANDS_SIZE
• CONFIG_MIN_COMMAND_BUFFERS_SIZE

And in OpenGLDriver.cpp we have:

• mHandleArena("Handles", 2U * 1024U * 1024U),

I didn't find other buffer sizes which should be configurable; but there might be more.

@pixelflinger and @romainguy what are you thoughts on this? Should we create Builders for these too?

[roxlu]

@romainguy what about using #defines so you can at least configure them? This could be added in 5min and we have a solution that works for now.