GL_SAMPLEPOSITION(3G)

📦
version 1.1 · 7 versions
, in centos-stream 9

🌸 NAME 🌸

okay so welcome to the GL_SAMPLEPOSITION(3G) page, bestie — manual section 3G, with that header placeholder [FIXME: manual] doing its little thing. 💅

gl_SamplePosition — contains the location of the current sample within the current fragment. slay.

🎀 DECLARATION 🎀

the declaration is literally this, no cap:

in vec2 gl_SamplePosition ;.SH "DESCRIPTION"

yes, the .SH "DESCRIPTION" bit is glued on there in the original source line — iconic formatting chaos, periodt. 😭

✨ DESCRIPTION ✨

gl_SamplePosition is a fragment language input variable that contains the location within a fragment of the sample currently being processed.

The x and y components of gl_SamplePosition contain the sub-pixel coordinate of the current sample and will have values in the range 0.0 to 1.0. The sub-pixel coordinates of the center of the pixel are always (0.5, 0.5).

big caveat, bestie: any static use of gl_SamplePosition causes the entire fragment shader to be evaluated per-sample rather than per-fragment. 😭✨

When rendering to a non-multisample buffer, or if multisample rasterization is disabled, gl_SamplePosition will be (0.5, 0.5).

🦋 VERSION SUPPORT 🦋

here’s the support vibe check for the function name gl_SamplePosition across the OpenGL Shading Language Version columns, fr fr:

  • 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_SampleID()
  • gl_SampleMask()
  • gl_FragCoord()

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 © 2011-2014 Khronos Group

okay bestie, that’s the whole GL_SAMPLEPOSITION(3G) page. the footer energy is source/version [FIXME: source], dated 08/09/2021 — mwah 💋🫶

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