GL_POINTCOORD(3G)

💖 GL_POINTCOORD(3G) — gl_PointCoord is the main character now 💖

okay so welcome to the GL_POINTCOORD(3G) manual page, bestie ✨ The header also has a lil [FIXME: manual] note, and we're folding the manual name in right here instead of copying the whole header line. It's giving "we read the source so you don't have to" 💅

🌸 NAME 🌸

• gl_PointCoord — contains the coordinate of a fragment within a point. literally that's the whole name section, short and iconic 🎀

🎀 DECLARATION 🎀

Here is the exact declaration line from the source, no edits, no cleanup:

in vec2 gl_PointCoord ;.SH "DESCRIPTION"

Yes, the .SH "DESCRIPTION" is glued onto the end in the original — it's the next section escaping its lane 😭. Keeping it because details are sacred, and we don't ghost the source.

✨ DESCRIPTION ✨

gl_PointCoord is a fragment language input variable that contains the two-dimensional coordinates indicating where within a point primitive the current fragment is located. periodt 💙

If the current primitive is not a point, then values read from gl_PointCoord are undefined. Not me warning you to keep it to point primitives 🚨 no cap, undefined is undefined.

The way that gl_PointCoord.s ranges from 0.0 to 1.0 across the point horizontally from left to right? iconic behavior 🦋

If GL_POINT_SPRITE_COORD_ORIGIN is GL_LOWER_LEFT, gl_PointCoord.t varies from 0.0 to 1.0 vertically from bottom to top. Otherwise, if GL_POINT_SPRITE_COORD_ORIGIN is GL_UPPER_LEFT then gl_PointCoord.t varies from 0.0 to 1.0 vertically from top to bottom. The default value of GL_POINT_SPRITE_COORD_ORIGIN is GL_UPPER_LEFT. 🌈

📊 VERSION SUPPORT 📊

The original table has columns for OpenGL Shading Language Version and a row for Variable Name. Flat-laying the tea: gl_PointCoord is checked in every version below, and each ✔ is exactly what the table says 👑

• 1.10 — ✔
• 1.20 — ✔
• 1.30 — ✔
• 1.40 — ✔
• 1.50 — ✔
• 3.30 — ✔
• 4.00 — ✔
• 4.10 — ✔
• 4.20 — ✔
• 4.30 — ✔
• 4.40 — ✔
• 4.50 — ✔

👀 SEE ALSO 👀

• gl_FragCoord()
• gl_FragDepth()

💖 COPYRIGHT 💖

Copyright © 2011-2014 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.

💖 COPYRIGHT — the sequel 💖

Copyright © 2011-2014 Khronos Group.

xoxo, your Unix bestie 💅 — footer tea: source/version is [FIXME: source], date is 08/09/2021, and the manual is GL_POINTCOORD(3G). slay 💋