dolphin/Source/Core/VideoCommon/VertexShaderGen.h, branch 2609

Optimize vertex_shader_uid_data down to 28 bytes

2026-08-07T06:42:52+00:00

This started as a fixing a misalignment issue, but I got carried away.
Was originally 41 bytes (overflowing it's expected 40 bytes by 1 bit).

Now it's 27 bytes plus 8 bits of padding (ready for future expansion).

The savings come from:
 - Removing UV usage from components, it can be reconstructed from
   texcoord_elem_count (saved 8 bits)
 - Removed the 8 unused bits from texMtxInfo_n_projection (saved 8 bits)
 - Removing unused bit from from start of components (saved 1 bit)
 - Removed extra bit from inputform, texgentype and sourcerow
 - packed texMtxInfo_n_projection and texcoord_elem_count back into
   the per texgen info space freed up above. (saved 24 bits)
 - Overlayed postMtx index and Emboss mode shifts into a union based on
   texgentype (saved 56 bits)
 - Move to a single-bit union tag, freeing up an extra bit for regular
   texgens.
 - Move PotMtx normalize into the freed up space (saved 8 bits)

Total savings: 105 bits of data

EDIT: Even worse, MSVC wasn't respecting pack(1) for bitfields at all,
      so on windows this struct was actually quite a bit larger.
      Something like 80 bytes, if not more.

      Fixed this by dropping the size of any enums used in these
      bit structs to u8. Our Common::BitField allows for the underlying
      type to be explicitly specified to something larger.

      msvc's bitfield packing appears to be completely braindead, can't
      mix sizes at all.

VideoCommon: move vertex shader gen logic to a 'process_vertex()' function, to eventually allow for custom shaders to override vertex logic

2025-05-24T06:27:58+00:00

Fix build errors related to formatting non-scoped enums

2022-11-23T21:45:43+00:00

VideoCommon: Add vertex shader point and line expansion

2022-10-23T01:13:24+00:00

VideoCommon: Rename norm0/norm1/norm2 to normal/tangent/binormal

2022-04-22T23:54:36+00:00

treewide: convert GPLv2+ license info to SPDX tags

2021-07-05T02:35:56+00:00

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.

Convert XFMemory to BitField and enum class

2021-03-07T03:27:14+00:00

Additionally a new ClipDisable union has been added (though it is not currently used by Dolphin).

VideoCommon: Remove unnecessary memset on ShaderUid instances.

2019-05-30T10:41:54+00:00

Zero-initialization zeroes out all members and padding bits, so this is
safe to do. While we're at it, also add static assertions that enforce
the necessary requirements of a UID type explicitly within the ShaderUid
class.

This way, we can remove several memset calls around the shader
generation code that makes sure the underlying UID data is zeroed out.
Now our ShaderUid class enforces this for us, so we don't need to care about
it at the usage sites.

VertexShaderGen: Convert defines to an enum

2018-03-18T19:45:20+00:00

Unlike defines, these will actually obey namespacing (should one be
added), and also provide a symbol when debugging, as opposed to a magic
value.

ShaderGen: Pass host config to shader generation functions

2017-07-20T07:54:33+00:00

Also moves the host config checks to common.