GLBINDBUFFERRANGE(3G)

💅 GLBINDBUFFERRANGE(3G) 💅

okay so bestie, you know how sometimes you just need to bind a range within a buffer object to an indexed buffer target? no? well, literally same until five minutes ago. this is glBindBufferRange from the OpenGL family (3G manual, if you're keeping track), and we're about to make it make sense. no cap. 🫶

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📜 NAME ✨

glBindBufferRange — bind a range within a buffer object to an indexed buffer target. it's giving "specific slice energy" and we're here for it. 🍓

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🔧 C SPECIFICATION 💻

void glBindBufferRange(GLenum target, GLuint index, GLuint buffer,
                       GLintptr offset, GLsizeiptr size);

this is the whole vibe. five parameters, one function, zero chill. 🎀

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🛠️ PARAMETERS 🧚

• target — the target of the bind operation, bestie. must be one of GL_ATOMIC_COUNTER_BUFFER, GL_TRANSFORM_FEEDBACK_BUFFER, GL_UNIFORM_BUFFER, or GL_SHADER_STORAGE_BUFFER. pick one, don't be weird about it. 💅
• index — the index of the binding point within the array specified by target. like, which slot in the lineup. main character slot. 👑
• buffer — the name of a buffer object to bind to the specified binding point. it's the actual buffer getting its moment. 🔥
• offset — the starting offset in basic machine units into the buffer object buffer. where the range begins. the starting line, if you will. 🌈
• size — the amount of data in machine units that can be read from the buffer object while used as an indexed target. how much of the buffer we're claiming. the range's whole personality. ✨

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🌸 DESCRIPTION 💖

okay so glBindBufferRange binds a range of the buffer object buffer — represented by offset and size — to the binding point at index within the array of targets specified by target. each target represents an indexed array of buffer binding points, plus a single general binding point that other buffer manipulation functions (like glBindBuffer() or glMapBuffer()) can use. so it's not just one binding, it's a whole ecosystem. it's giving "community" honestly. 🦋

and here's the slay: in addition to binding a range of buffer to the indexed buffer binding target, glBindBufferRange also binds the range to the generic buffer binding point specified by target. double duty. iconic behavior. periodt. 💀

to recap: offset specifies the offset in basic machine units into the buffer object buffer, and size specifies the amount of data that can be read from the buffer object while used as an indexed target. literally just "start here, read this much." simple. elegant. slay. 💜

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📝 NOTES 📌

• the GL_ATOMIC_COUNTER_BUFFER target is available only if the GL version is 4.2 or greater. so if you're on 4.1 and wondering why it's not working, that's why, bestie. 🙈
• the GL_SHADER_STORAGE_BUFFER target is available only if the GL version is 4.3 or greater. same energy, different version. ⭐

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💀 ERRORS 😭

listen, things can go wrong. here's the tea:

• GL_INVALID_ENUM is generated if target is not one of GL_ATOMIC_COUNTER_BUFFER, GL_TRANSFORM_FEEDBACK_BUFFER, GL_UNIFORM_BUFFER, or GL_SHADER_STORAGE_BUFFER. pick a valid target or the GL gods will not be pleased. 🔥
• GL_INVALID_VALUE is generated if index is greater than or equal to the number of target-specific indexed binding points. don't exceed the lineup, bestie. 💅
• GL_INVALID_VALUE is generated if size is less than or equal to zero — so zero is not a vibe — or if offset + size is greater than the value of GL_BUFFER_SIZE. the math has to math. 🧮
• additional errors may be generated if offset violates any target-specific alignmemt restrictions. yes, that's spelled that way in the manual. we love a typo moment. keep your offsets aligned, iykyk. 🙈

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✅ VERSION SUPPORT 🌈

okay so the original manual had this whole table with a ✔ vs - situation, and i'm about to translate. the function glBindBufferRange is not available in OpenGL 2.0 or 2.1 (both marked -). but from OpenGL 3.0 all the way through 4.5 — that's 3.0, 3.1, 3.2, 3.3, 4.0, 4.1, 4.2, 4.3, 4.4, and 4.5 — it's marked ✔ across the board. so if you're on anything 3.0+, you're eating good. if you're on 2.x, i'm so sorry bestie. 💀

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👀 SEE ALSO 🫶

if you liked this function, you'll love these:

• glGenBuffers()
• glDeleteBuffers()
• glBindBuffer()
• glBindBufferBase()
• glMapBuffer()
• glUnmapBuffer()

a whole friend group. go check them out. 🦋

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©️ 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 © 2010-2014 Khronos Group. (yes, twice. they really wanted us to know. 💅)

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okay and finally, the mysterious source footer vibes: this masterpiece was brought to you by [FIXME: source] on 08/09/2021. we don't know the source, but we know the date. and honestly? that's enough. stay slay, bind those ranges, and remember: the way that offset + size can't exceed GL_BUFFER_SIZE? it's giving boundaries. and boundaries are healthy. 🌸💖✨