A reference guide for Orkid’s GeometryBufferInterface, the part of its graphics system that stores vertex and index data and sends drawing commands to the GPU.

Use it to answer questions about vertex and index buffers, vertex formats, draw primitives, buffer updates, and Python geometry code.

It helps developers find the right Orkid types, methods, source files, and Python bindings when working with low-level geometry rendering.

How tweakoz/orkid configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to tweakoz/orkid. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/tweakoz/orkid/develop/.claude/skills/orklev2-gbi/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/tweakoz/orkid

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/tweakoz/orkid/orklev2-gbi.svg)](https://agentmods.dev/skills/tweakoz/orkid/orklev2-gbi)

Your own site

<a href="https://agentmods.dev/skills/tweakoz/orkid/orklev2-gbi"><img src="https://agentmods.dev/badge/skills/tweakoz/orkid/orklev2-gbi.svg" alt="Measured on agentmods" height="20"></a>

Per session 89 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,871 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00089	$0.01871
Opus 5	$0.00044	$0.00936
Sonnet 5	$0.00018	$0.00374
Haiku 4.5	$0.00009	$0.00187

Measured 7d ago against content hash 6aaa9bb310e0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

orklev2-gbi scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 7d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/skills/orklev2-gbi/SKILL.md · 153 lines

How it starts

The opening of the file, as written. The whole thing — 153 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Orkid GeometryBufferInterface (GBI) Reference

When answering questions about geometry, vertex buffers, or draw calls in orkid, consult the files below. All under ork.lev2/.

Key Files

Component	File
GBI Interface	`inc/ork/lev2/gfx/gbi.h` (lines 18–152)
Vertex/Index Buffers	`inc/ork/lev2/gfx/gfxvtxbuf.h`
Vertex Format Structs	`inc/ork/lev2/gfx/gfxvtxbuf_structs.h`
Vertex Buffer Inline	`inc/ork/lev2/gfx/gfxvtxbuf.inl`
Enums (formats, primitives)	`inc/ork/lev2/gfx/gfxenv_enum.h`
Base Implementation	`src/gfx/context/gbi.cpp`
Vulkan GBI	`src/gfx/vulkan/vulkan_gbi.cpp`
Python Bindings	`pyext/src/pyext_gfx.cpp` (lines 259–370)

GBI Interface (gbi.h:18–152)

Vertex Buffer Operations

LockVB(VBuf, ivbase, icount) → void* — lock for writing
UnLockVB(VBuf) — unlock after writing
ReleaseVB(VBuf) — release GPU resources
FlushVB(VBuf) — flush to GPU

Index Buffer Operations

LockIB(IBuf, ibase, icount) → void*
UnLockIB(IBuf)
ReleaseIB(IBuf)

Draw Methods (EML — direct, no material management)

DrawPrimitiveEML(VBuf, type, ivbase, ivcount) — from vertex buffer
DrawPrimitiveEML(SSBO, type, ivbase, ivcount) — from storage buffer
DrawIndexedPrimitiveEML(VBuf, IdxBuf, type) — indexed draw
DrawInstancedIndexedPrimitiveEML(VBuf, IdxBuf, type, instance_count) — instanced
DrawInstancedIndexedPrimitiveEML(VBuf, IdxBuf, type, instance_count, first_instance) — with offset

Draw Methods (with material)

DrawPrimitive(GfxMaterial*, VtxWriter, type, icount) — from writer
DrawPrimitive(GfxMaterial*, VBuf, type, ivbase, ivcount) — from buffer
DrawIndexedPrimitive(GfxMaterial*, VBuf, IdxBuf, type) — indexed

2D Helpers

render2dQuadEML(quadrect, uvrecta, uvrectb, depth) — screen-space quad
render2dQuadEMLCCL(quadrect, uvrecta, uvrectb, depth) — CCL variant

PrimitiveType (gfxenv_enum.h:165–178)

Type	Description
`POINTS`	Point list
`LINES`	Line list
`LINESTRIP`	Connected line strip
`LINELOOP`	Closed line loop
`TRIANGLES`	Triangle list
`TRIANGLESTRIP`	Triangle strip
`TRIANGLEFAN`	Triangle fan
`QUADS`	Quad list
`PATCHES`	Tessellation patches

Read the full file on GitHub · 153 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

7d ago First seen · 153 lines · 89 tokens per session scan A 6aaa9bb310e0

Subscribe to this mod's changes

orklev2-gbi is a skill published in the GitHub repository tweakoz/orkid (35 stars, last pushed 27d ago), licensed MIT. It adds 89 tokens to every session and 1,871 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-01.

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orkid: Skill for Claude Code