OpenGL Functions 2

Question 1

Which function is used to specify the source and destination blending factors in OpenGL?

Accepted Answer

glBlendFunc()

Answer

glBlendFunc() sets the pixel arithmetic for blending by specifying source and destination factors.

Question 2

What does glDepthMask(GL_FALSE) do?

Accepted Answer

Makes the depth buffer read-only

Answer

glDepthMask(GL_FALSE) disables writes to the depth buffer, making it effectively read-only while depth testing can still occur.

Question 3

Which OpenGL function retrieves the location of a uniform variable in a shader program?

Accepted Answer

glGetUniformLocation()

Answer

glGetUniformLocation() returns the integer location of a named uniform variable within a linked program object.

Question 4

What is the purpose of glGenerateMipmap()?

Accepted Answer

Automatically generates all mipmap levels for a texture

Answer

glGenerateMipmap() automatically computes all mipmap levels for the currently bound texture from the base level image.

Question 5

Which function do you call to attach a renderbuffer to a framebuffer object?

Accepted Answer

glFramebufferRenderbuffer()

Answer

glFramebufferRenderbuffer() attaches a renderbuffer object to a specified attachment point of the currently bound framebuffer.

OpenGL Practice Test