GLDEPTHRANGEINDEXED(3G)

✨ NAME ✨

okay so welcome to the GLDEPTHRANGEINDEXED(3G) manual page, bestie 💖 — this one is all about glDepthRangeIndexed, and its whole job is to specify mapping of depth values from normalized device coordinates to window coordinates for a specified viewport. It's giving “depth range, but make it indexed.” 💅

🌸 C SPECIFICATION 🌸

void glDepthRangeIndexed(GLuint index, GLdouble nearVal,
                         GLdouble farVal);

🎀 PARAMETERS 🎀

• index — specifies the index of the viewport whose depth range to update. 👑
• nearVal — specifies the mapping of the near clipping plane to window coordinates. The initial value is 0. 🌸
• farVal — specifies the mapping of the far clipping plane to window coordinates. The initial value is 1. 🦋

💅 DESCRIPTION 💅

so after clipping and division by w, depth coordinates range from -1 to 1, and that corresponds to the near and far clipping planes. 🌈 Each viewport has its own independent depth range, specified as a linear mapping of the normalized depth coordinates in this range to window depth coordinates. no cap.

regardless of the actual depth buffer implementation, window coordinate depth values are treated as though they range from 0 through 1 (like color components). glDepthRangeIndexed specifies a linear mapping of the normalized depth coordinates in this range to window depth coordinates for a specified viewport. so basically the values accepted by glDepthRangeIndexed are both clamped to this range before they are accepted. 💖

the index parameter specifies the index of first viewport whose depth range to modify and must be less than the value of GL_MAX_VIEWPORTS. nearVal and farVal specify near and far values of the depth range for the specified viewport, respectively. 🌟

the setting of (0,1) maps the near plane to 0 and the far plane to 1. with this mapping, the depth buffer range is fully utilized. iconic. 👑

🦋 NOTES 🦋

• it is not necessary that the near plane distance be less than the far plane distance. reverse mappings such as nearVal = 1, and farVal = 0 are acceptable. 💀✨
• the type of the nearVal and farVal parameters was changed from GLclampd to GLdouble. this change is transparent to user code and is described in detail on the removedTypes() page. 🫶

💀 ERRORS 💀

GL_INVALID_VALUE is generated if index is greater than or equal to the value of GL_MAX_VIEWPORTS. 😭

👀 ASSOCIATED GETS 👀

glGet() with argument GL_DEPTH_RANGE. 👑

🌈 VERSION SUPPORT 🌈

the version-support table has one row — function/feature name glDepthRangeIndexed — across the OpenGL Version columns 2.0 through 4.5. here's the exact vibe check, bestie:

• OpenGL 2.0 — -
• OpenGL 2.1 — -
• OpenGL 3.0 — -
• OpenGL 3.1 — -
• OpenGL 3.2 — -
• OpenGL 3.3 — -
• OpenGL 4.0 — -
• OpenGL 4.1 — ✔
• OpenGL 4.2 — ✔
• OpenGL 4.3 — ✔
• OpenGL 4.4 — ✔
• OpenGL 4.5 — ✔

🔥 SEE ALSO 🔥

go peek at glDepthFunc(), glDepthRange(), glDepthRangeArray(), glPolygonOffset(), glViewportArray(), glViewport(), and removedTypes(). 💖

💖 COPYRIGHT 💖

Copyright © 2010-2014 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 💖

Copyright © 2010-2014 Khronos Group. 💜

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okay that's the whole manual page, bestie: source/version [FIXME: source], dated 08/09/2021, page GLDEPTHRANGEINDEXED(3G) — bye and slay 💅✨