GLDRAWTRANSFORMFEEDB(3G)

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

💖 GLDRAWTRANSFORMFEEDB(3G) 💖

okay so this is the 3G manual page, bestie, and the header placeholder is literally [FIXME: manual]. We're doing this. 💅

🌸 NAME 🌸

glDrawTransformFeedbackStream — render primitives using a count derived from a specifed stream of a transform feedback object. yes, "specifed" is what the page says, we're preserving the lore. 🫶

✨ C SPECIFICATION ✨

void glDrawTransformFeedbackStream(GLenum mode, GLuint id,
                                   GLuint stream);

🎀 PARAMETERS 🎀

  • mode — tells the function what kind of primitives to render, bestie. These symbolic constants are accepted: GL_POINTS, GL_LINE_STRIP, GL_LINE_LOOP, GL_LINES, GL_LINE_STRIP_ADJACENCY, GL_LINES_ADJACENCY, GL_TRIANGLE_STRIP, GL_TRIANGLE_FAN, GL_TRIANGLES, GL_TRIANGLE_STRIP_ADJACENCY, GL_TRIANGLES_ADJACENCY, and GL_PATCHES.
  • id — the name of a transform feedback object, and this is the object we pull a primitive count from. iconic little lookup moment ✨
  • stream — the index of the transform feedback stream we're pulling that primitive count from. stream rights! 🌊

🦋 DESCRIPTION 🦋

So glDrawTransformFeedbackStream draws primitives of the type you picked with mode, using a count retrieved from the transform feedback stream specified by stream of the transform feedback object specified by id. That's the whole vibe. 💖

Calling glDrawTransformFeedbackStream is equivalent to calling glDrawArrays() with mode as specified, first set to zero, and count set to the number of vertices captured on vertex stream stream the last time transform feedback was active on the transform feedback object named by id. no cap, that's the equivalence. 🔥

Also: calling glDrawTransformFeedback() is equivalent to calling glDrawTransformFeedbackStream with stream set to zero. tiny stream-zero shortcut energy. 🧚

💀 ERRORS 💀

  • GL_INVALID_ENUM is generated if mode is not an accepted value. rude mode rejected.
  • GL_INVALID_VALUE is generated if id is not the name of a transform feedback object.
  • GL_INVALID_VALUE is generated if stream is greater than or equal to the value of GL_MAX_VERTEX_STREAMS. stream check says nope.
  • GL_INVALID_OPERATION is generated if a non-zero buffer object name is bound to an enabled array and the buffer object's data store is currently mapped.
  • GL_INVALID_OPERATION is generated if a geometry shader is active and mode is incompatible with the input primitive type of the geometry shader in the currently installed program object.
  • GL_INVALID_OPERATION is generated if mode is GL_PATCHES and no tessellation control shader is active.
  • GL_INVALID_OPERATION is generated if glEndTransformFeedback has never been called while the transform feedback object named by id was bound. the "you forgot to end it" jumpscare, lowkey. 😭

🌈 VERSION SUPPORT 🌈

Function / Feature Name: glDrawTransformFeedbackStream

OpenGL Version table entries, bestie — exact vibes only:

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

slay, the checkmarks start at 4.0. 👑

🍓 SEE ALSO 🍓

  • glDrawArrays()
  • glDrawArraysInstanced()
  • glDrawElements()
  • glDrawRangeElements()
  • glDrawTransformFeedback()

go read those too, bestie, the lore connects. 🦋

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 bestie, that's the page! the footer energy is: source placeholder [FIXME: source], date 08/09/2021, and page GLDRAWTRANSFORMFEEDB(3G). mwah 💖🎀✨

📦 where this page comes from