OpenGL OpenGL Extensions and Modern OpenGL 3

Question 1

What is the difference between an OpenGL core profile and a compatibility profile context?

Accepted Answer

Core profile removes deprecated features; compatibility profile retains them

Answer

Core profile includes deprecated features; compatibility does not

Answer

Core profile is for mobile devices; compatibility is for desktops

Answer

There is no functional difference

Question 2

What does the Direct State Access (DSA) API eliminate in OpenGL?

Accepted Answer

The requirement to bind an object before modifying its state

Answer

The need for VAOs

Answer

Shader compilation

Answer

Depth buffer allocation

Question 3

What is the purpose of the GL_ARB_debug_output (or KHR_debug) extension?

Accepted Answer

Provides asynchronous driver messages about errors, performance issues, and deprecated usage

Answer

Enables shader printf debugging

Answer

Adds GPU profiling counters

Answer

Allows reading back pipeline statistics

Question 4

In OpenGL 4.6, what functionality was added from SPIR-V support?

Accepted Answer

Ability to load precompiled SPIR-V shader binaries directly

Answer

Support for DirectX HLSL shaders

Answer

Hardware ray tracing API

Answer

Mesh shaders

Question 5

What does the NV or AMD prefix on an OpenGL extension name indicate?

Accepted Answer

The extension is vendor-specific and may not be available on other hardware

Answer

The extension follows the ARB review process

Answer

The extension is part of the OpenGL ES standard

Answer

The extension is deprecated

Question 6

What OpenGL 4.3 feature allows multiple draw calls to be issued from parameters stored in a GPU buffer?

Accepted Answer

Multi-Draw Indirect (glMultiDrawArraysIndirect)

Answer

Transform Feedback

Answer

Instanced rendering

Answer

Tessellation