OpenGL OpenGL Buffers and Textures

Question 1

What OpenGL object stores vertex data (positions, normals, UVs) on the GPU?

Accepted Answer

VBO

Answer

A Vertex Buffer Object (VBO) is a buffer object allocated on the GPU that holds raw vertex attribute data.

Question 2

What is the purpose of a Vertex Array Object (VAO) in OpenGL?

Accepted Answer

Records vertex attribute configurations and buffer bindings

Answer

A VAO saves the state of vertex attribute pointers and buffer bindings so the configuration can be restored with a single bind call.

Question 3

Which OpenGL function uploads vertex data from the CPU to a bound buffer object?

Accepted Answer

glBufferData

Answer

glBufferData(target, size, data, usage) allocates storage for the bound buffer and optionally copies data into it.

Question 4

What texture target is used when creating and binding a standard 2D image texture in OpenGL?

Accepted Answer

GL_TEXTURE_2D

Answer

GL_TEXTURE_2D is the target for standard two-dimensional images, the most common texture type in OpenGL.

Question 5

What does the GL_ELEMENT_ARRAY_BUFFER target store?

Accepted Answer

Index data for indexed drawing commands

Answer

GL_ELEMENT_ARRAY_BUFFER holds integer index data used by glDrawElements to specify which vertices to draw.

OpenGL Practice Test