OpenGL Functions 5

Question 1

Which function sets the clear color used by glClear(GL_COLOR_BUFFER_BIT)?

Accepted Answer

glClearColor()

Answer

glClearColor() specifies the RGBA values that the color buffer is filled with when glClear(GL_COLOR_BUFFER_BIT) is called.

Question 2

What does glVertexAttribDivisor(index, 1) do?

Accepted Answer

Steps the attribute once per instance during instanced rendering

Answer

Setting the divisor to 1 causes the attribute to advance once per instance rather than once per vertex, enabling per-instance data in instanced rendering.

Question 3

Which function is used to bind a named texture object to a texturing target?

Accepted Answer

glBindTexture()

Answer

glBindTexture() makes a texture object current for subsequent texture operations on the specified target such as GL_TEXTURE_2D.

Question 4

What is the effect of calling glEnable(GL_CULL_FACE) with the default cull face setting?

Accepted Answer

Back-facing triangles are discarded

Answer

By default, glEnable(GL_CULL_FACE) discards back-facing triangles because the default cull face is GL_BACK.

Question 5

Which function queries a program object for information such as link status?

Accepted Answer

glGetProgramiv()

Answer

glGetProgramiv() retrieves integer properties of a program object, including GL_LINK_STATUS and GL_ACTIVE_UNIFORMS.

OpenGL Practice Test

OpenGL Practice Test

OpenGL Functions 5