1 Welcome, opening and meeting logistics

Chris Bieneman, chair of TC57, began the teleconference and welcomed attendees. Attendees were reminded of the committee’s code of conduct, Ecma’s IPR policy, and TC57’s royalty-free patent policy extension. All attendees were informed that the meeting was recorded and transcribed by Zoom for the purpose of note-taking, and directed to review the video recording and legal disclaimer if they were not familiar.

2 Approval of the minutes of the previous meeting

There were no minutes to approve.

3 Review of the agenda

The meeting’s agenda pull request was proposed and approved at the start of the meeting.

• Roadmap View
• Draft Status
• Chair Elections
• Editorial Meetings
• Stage advancements
  • 0003 - overload resolution to Accepted
  • 0015 - const member functions to Accepted
  • 0016 - non-member operator overloading to Accepted
  • 0018 - user-defined conversions to Accepted
• Normative Language
  • Math Conversion Functions
• For 2026-09-29
  • Stage advancements
    • 0013 - named casts to Accepted
    • 0019 - size type to Refinement
  • Normative Language
    • Lex.Literal.Vector
    • Lex.Literal.Char
• How should we define HLSL strings?

4 Editors’ report

GitHub automation has been updated to provide permalinks for proposals.

5 Proposals

5.1 New proposals

There were no new proposals to review.

5.2 Stage advancement

The following proposals achieved consensus for stage advancement to “Accepted” after their intent to advance being announced at the previous meeting.

• 0003 - overload resolution to Accepted
• 0015 - const member functions to Accepted
• 0016 - non-member operator overloading to Accepted
• 0018 - user-defined conversions to Accepted

5.3 Future stage advancement

The following proposals and PRs will seek advancement/approval to merge at the 15^th plenary on 29 September. The chair requests that all delegates review and engage in the conversation to resolve any potential concerns before then.

• Stage advancements
  • 0013 - named casts to Accepted
  • 0019 - size type to Refinement
• Normative Language
  • Lex.Literal.Vector
  • Lex.Literal.Char

6 Discussions

6.1 Normative consensus PRs

6.1.1 Math conversion functions (hlsl-tc57/tc57#179)

This pull request has editor sign-off in addition to all comments being resolved and several delegates explicitly approving. It reached consensus to merge.

6.2 Open issues regarding language changes

6.2.1 Overview

The committee reviewed open issues which do not fall clearly on one side or the other of “defect” vs “proposal”. Part of this tension is how to handle distinction between specification text and the reference implementation. The chair sought consensus on how to handle issues that are both a gap in the specification and a defect in reference behaviour.

6.2.2 HLSL Enumerations (hlsl-tc57/tc57#190)

This issue acknowledges that between feature introductions to DXC, C++ made meaningful changes causing divergence in HLSL enum declaration. The committee decided to treat this as a defect.

6.2.3 Include all ways of declaring a cbuffer (hlsl-tc57/tc57#194)

There is a gap in proposal 0005 (accepted) regarding two additional manners in which to declare a cbuffer. The chair suggested this is an intended but thus far unwritten aspect of the specification, as opposed to an oversight, and considers it a part of the roadmap.

6.2.4 Refine language about matrix subscripting (hlsl-tc57/tc57#195)

This issue concerns a gap in proposal 0006 (accepted), where an edge case of invalid matrix subscript is not thoroughly described. The committee opted to treat it as a defect.

6.2.5 Initialized unsized array declarations (hlsl-tc57/tc57#196)

The proposed solution section of 0006 mentioned allowing unsized arrays for resources and also for arrays where the initialization implied the size, but the latter is missing from the accepted design. The committee reached consensus to treat this as a defect.

6.3 How should we define HLSL strings? (hlsl-tc57/tc57#200)

HLSL currently handles strings inconsistently. Chris Bieneman (Microsoft) proposes that strings are specified as an intangible type, and in the future that printf is added to the standard. The committee reached consensus to pursue this further, and to treat this as a defect.

7 Any other business

Chair elections for October 2026-October 2027 will take place at the next TC57 meeting, please make your nominations in the GitHub issue. Current chair Chris Bieneman encouraged delegates from members with less representation overall to consider running for chair or vice chair, as well as any delegates from the userland side of HLSL who could bring a fresh perspective to the process.

8 Next meetings

The next meeting will be held on Tuesday, 29 September 2026 at 09:00 PDT.

Meetings are held via Zoom call every other Tuesday at 09:00 PDT (12:00 EDT, 18:00 CEST). Meeting times during seasonal time changes will be scheduled based on US Pacific (America/Los_Angeles) time.

8.1 Future Agendas

Agendas are viewable in GitHub and remain available in perpetuity.

9 Conclusion

The Chair wrapped up the meeting and the call concluded.