Nothing made a framebuffer with additional colour attachments, so they
go from AbstractFramebuffer, CreateFramebuffer and every backend, and
FramebufferState's additional_color_attachment_count (always 0) with
them: render passes, views, clears, RTVs and blending are for one
colour attachment, in fixed arrays rather than vectors.
Vulkan samplers are kept in an open-addressed table grown by doubling
and render passes in a fixed array, so looking one up never allocates.
Play allocations on the core's thread: 62 to 58.
Shaders, pipelines, textures, staging textures and framebuffers call
into the classes of the backend in use, which each backend's Gfx sets
as g_video_backend_kind; those classes are final, so the calls are
direct. A std::default_delete specialization deletes them as their own
class. The Null and Software renderers use the base shader and pipeline
types.
SPDX standardizes how source code conveys its copyright and licensing
information. See https://spdx.github.io/spdx-spec/1-rationale/ . SPDX
tags are adopted in many large projects, including things like the Linux
kernel.
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