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fix: add missing glossary entry for present-mode

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Krishna Ayyalasomayajula
2026-05-30 18:00:58 -05:00
parent 19c112d3bb
commit b66be87ab9
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docs/concepts/GLOSSARY.md
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@@ -70,6 +70,10 @@ A compiled GPU configuration bundling: [[vertex shader]](#vertex-shader) + [[fra
The strategy passed to `device.poll()`. `PollType::Wait` blocks the calling thread until all pending GPU work finishes — equivalent to a fence wait. `PollType::Poll` checks for completed work once and returns immediately, regardless of whether work is done. For the rainbow triangle, `Wait` is correct: we need the GPU to finish the frame before requesting the next surface texture. The strategy passed to `device.poll()`. `PollType::Wait` blocks the calling thread until all pending GPU work finishes — equivalent to a fence wait. `PollType::Poll` checks for completed work once and returns immediately, regardless of whether work is done. For the rainbow triangle, `Wait` is correct: we need the GPU to finish the frame before requesting the next surface texture.
## Present Mode
How the display compositor handles frame buffer presentation: `PresentMode::Mailbox` uses triple buffering for tear-free rendering, `PresentMode::Fifo` provides VSYNC-locked double buffering, `PresentMode::Immediate` renders without synchronization (may show tearing).
## Ndc ## Ndc
Normalized Device Coordinates. The GPU's native intermediate coordinate space. X and Y range from -1.0 (left/bottom) to +1.0 (right/top). Z ranges from 0.0 (near clipping plane) to 1.0 (far clipping plane). Geometry is mapped into NDC by the GPU after perspective division. Anything outside this cube is clipped. See [[coordinate-systems.md]](coordinate-systems.md). Normalized Device Coordinates. The GPU's native intermediate coordinate space. X and Y range from -1.0 (left/bottom) to +1.0 (right/top). Z ranges from 0.0 (near clipping plane) to 1.0 (far clipping plane). Geometry is mapped into NDC by the GPU after perspective division. Anything outside this cube is clipped. See [[coordinate-systems.md]](coordinate-systems.md).