OpenGL OpenGL Shaders 3

Question 1

In GLSL, what is the data type of a 2D texture sampler?

Accepted Answer

sampler2D

Answer

texture2D

Answer

image2D

Answer

uniform2D

Question 2

What does the GLSL discard statement do in a fragment shader?

Accepted Answer

Prevents the fragment from being written to the framebuffer

Answer

Discards all vertex data

Answer

Resets uniform values

Answer

Ends the current draw call

Question 3

Which GLSL built-in provides the window-space position of the current fragment?

Accepted Answer

gl_FragCoord

Answer

gl_Position

Answer

gl_FragDepth

Answer

gl_PointCoord

Question 4

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

Accepted Answer

glGetUniformLocation

Answer

glGetAttribLocation

Answer

glBindUniform

Answer

glUniform1i

Question 5

Which shader stage runs once per primitive and can modify or generate vertices between the vertex and fragment stages?

Accepted Answer

Geometry shader

Answer

Compute shader

Answer

Tessellation shader

Answer

Transform feedback

Question 6

What GLSL built-in variable gives the index of the current vertex in a draw call?

Accepted Answer

gl_VertexID

Answer

gl_InstanceID

Answer

gl_DrawID

Answer

gl_PrimitiveID