Hacktoberfest 2026: the issues maintainers tagged for October, open and beginner-friendly. Browse Hacktoberfest issues

Add XMVector[3/4]TransformTranspose(Stream)

Open
#11 0 comments 0 reactions 0 assignees View on GitHub

Nobody has claimed this yet.

Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
38/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
cpp

Research direction

Start with the four requested entry points: XMVector3TransformTranspose, XMVector4TransformTranspose, XMVector3TransformTransposeStream, and XMVector4TransformTransposeStream, using the transpose formulas in the issue as the behavioral reference. The payload names no source file or test; done means providing optimized implementations for all four functions and validating their transposed-matrix results.

Written by the indexing model from the issue text.

Description

proposal

DirectXMath has a number of different forms of transformation, but currently lacks an optimized function for doing transforms by transposed matrices:

  • XMVector3TransformTranspose
  • XMVector4TransformTranspose
  • XMVector3TransformTransposeStream
  • XMVector4TransformTransposeStream

This would compute:

v * M = [dot(vx, Mx), dot(vy, My), dot(vz, Mz), dot(vw, Mw)]
v * M^T = mul(v, Mx) + mul(v, My) + mul(v, Mz) + mul(v, Mw)
Dominant language
C++
Stars
1.8k
Forks
262
Avg merge
3d 12h
Merged PRs (30d)
5

Contributor guide

No contributing guide indexed for this repository

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

More from microsoft/DirectXMath

All issues in microsoft/DirectXMath

Similar issues

More C++ issues

Get new issues in your inbox

A short digest of beginner-friendly GitHub issues.