Relationship between Video Mem, Texture Mem and Buffer Mem?

[nines]

Godot Version

4.3

Question

In the debugger, under Monitors Tab, in the Video section, what are the relationships between Video Mem, Texture Mem and Buffer Mem?

I believe all the textures from png images and such go into Texture Mem, but for Video Mem and Buffer Mem, what do these hold?

[Sanne]

There’s some info in RenderingServer’s RenderingInfo enum:

RenderingInfo RENDERING_INFO_TEXTURE_MEM_USED = 3
Texture memory used (in bytes).

RenderingInfo RENDERING_INFO_BUFFER_MEM_USED = 4
Buffer memory used (in bytes). This includes vertex data, uniform buffers, and many miscellaneous buffer types used internally.

RenderingInfo RENDERING_INFO_VIDEO_MEM_USED = 5
Video memory used (in bytes). When using the Forward+ or mobile rendering backends, this is always greater than the sum of RENDERING_INFO_TEXTURE_MEM_USED and RENDERING_INFO_BUFFER_MEM_USED, since there is miscellaneous data not accounted for by those two metrics. When using the GL Compatibility backend, this is equal to the sum of RENDERING_INFO_TEXTURE_MEM_USED and RENDERING_INFO_BUFFER_MEM_USED.

One example for video memory that’s not also reported in texture or buffer memory seems to be things like baked voxelgi data.