GLBINDFRAGDATALOCATI(3G)

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version 1.1 · 7 versions
, in centos-stream 9

💖 GLBINDFRAGDATALOCATI(3G) 💖

okay so this is the GLBINDFRAGDATALOCATI(3G) page from the 3G manual, and yes the header is literally wearing a [FIXME: manual] sticker — unfinished icon behavior, we love to see it 💅.

🌸 NAME 🌸

glBindFragDataLocation — bind a user-defined varying out variable to a fragment shader color number. periodt.

🧾 C SPECIFICATION 🧾

void glBindFragDataLocation(GLuint program, GLuint colorNumber,
                            const char * name);

🎀 PARAMETERS 🎀

  • program — the name of the program containing the varying out variable whose binding you want to modify.
  • colorNumber — the color number to bind the user-defined varying out variable to.
  • name — the name of the user-defined varying out variable whose binding you want to modify.

✨ DESCRIPTION ✨

okay bestie, here’s the vibe: glBindFragDataLocation explicitly specifies the binding of the user-defined varying out variable name to fragment shader color number colorNumber for program program. If name was bound previously, its assigned binding is replaced with colorNumber. name must be a null-terminated string. colorNumber must be less than GL_MAX_DRAW_BUFFERS.

The bindings specified by glBindFragDataLocation have no effect until program is next linked. Bindings may be specified at any time after program has been created. Specifically, they may be specified before shader objects are attached to the program. Therefore, any name may be specified in name, including a name that is never used as a varying out variable in any fragment shader object. Names beginning with gl_ are reserved by the GL.

In addition to the errors generated by glBindFragDataLocation, the program program will fail to link if:
  • The number of active outputs is greater than the value GL_MAX_DRAW_BUFFERS.
  • More than one varying out variable is bound to the same color number.

🦋 NOTES 🦋

Varying out varyings may have indexed locations assigned explicitly in the shader text using a location layout qualifier. If a shader statically assigns a location to a varying out variable in the shader text, that location is used and any location assigned with glBindFragDataLocation is ignored. lowkey important, no cap 🫶.

💀 ERRORS 💀

  • GL_INVALID_VALUE is generated if colorNumber is greater than or equal to GL_MAX_DRAW_BUFFERS.
  • GL_INVALID_OPERATION is generated if name starts with the reserved gl_ prefix.
  • GL_INVALID_OPERATION is generated if program is not the name of a program object.

🔍 ASSOCIATED GETS 🔍

glGetFragDataLocation() with a valid program object and the name of a user-defined varying out variable.

📊 VERSION SUPPORT 📊

the grid labels its side header Function / Feature Name and its top header OpenGL Version, and the glBindFragDataLocation row goes like this, 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 👀

glCreateProgram(), glGetFragDataLocation()

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 © 2010-2014 Khronos Group

okay that’s the whole page, bestie — the footer says source [FIXME: source], version/date 08/09/2021, and GLBINDFRAGDATALOCATI(3G). mwah 💋

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