GLPOLYGONOFFSET(3G)

📦 version 24.3.3, in opensuse-leap 16.0

hey bestie 💖 welcome to the GLPOLYGONOFFSET page from the 3G manual — it's giving depth-offset main character energy, and we're gonna understand it fr fr. ✨

🌸 NAME 🌸

glPolygonOffset — set the scale and units used to calculate depth values 💅

💻 C SPECIFICATION 💻

void glPolygonOffset( GLfloat factor,
                      GLfloat units )

🎀 PARAMETERS 🎀

  • factor — a scale factor used to create a variable depth offset for each polygon. The initial value is 0. 🌀
  • units — gets multiplied by an implementation-specific value to create a constant depth offset. The initial value is 0. 💖

🦋 DESCRIPTION 🦋

okay so when GL_POLYGON_OFFSET_FILL, GL_POLYGON_OFFSET_LINE, or GL_POLYGON_OFFSET_POINT is enabled, each fragment's depth value will be offset after it is interpolated from the depth values of the appropriate vertices. 👑 lowkey crucial.

the value of the offset is factor*DZ+r*units, where DZ is a measurement of the change in depth relative to the screen area of the polygon, and r is the smallest value that is guaranteed to produce a resolvable offset for a given implementation. no cap, that formula is iconic. 🌟

the offset is added before the depth test is performed and before the value is written into the depth buffer. periodt. 💅

glPolygonOffset is useful for rendering hidden-line images, for applying decals to surfaces, and for rendering solids with highlighted edges. ate that. 🔥

🌈 NOTES 🌈

  • glPolygonOffset is available only if the GL version is 1.1 or greater. 🫶
  • glPolygonOffset has no effect on depth coordinates placed in the feedback buffer. 🙈
  • glPolygonOffset has no effect on selection. 💀

💀 ERRORS 💀

GL_INVALID_OPERATION is generated if glPolygonOffset is executed between the execution of glBegin and the corresponding execution of glEnd. not me getting an error for that 😭

🔎 ASSOCIATED GETS 🔎

  • glIsEnabled with argument GL_POLYGON_OFFSET_FILL, GL_POLYGON_OFFSET_LINE, or GL_POLYGON_OFFSET_POINT. ⭐
  • glGet with argument GL_POLYGON_OFFSET_FACTOR or GL_POLYGON_OFFSET_UNITS. 🎀

👀 SEE ALSO 👀

  • glDepthFunc(3G)
  • glEnable(3G)
  • glGet(3G)
  • glIsEnabled(3G)

okay that's the whole vibe check 💖 — this page came from the GLPOLYGONOFFSET(3G) source/version footer, and there's no separate date line here, so that's the cute sign-off: GLPOLYGONOFFSET(3G) ✨ stay slay, bestie! 🫶

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