OpenGL Study Guide 2026
Everything you need to pass the OpenGL exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 OpenGL Exam Format at a Glance
📚 OpenGL Topics to Study (33)
✍️ Sample OpenGL Questions & Answers
1. What is the purpose of the GLSL normalize() function?
normalize(v) divides a vector by its magnitude, returning a direction vector of length 1.
2. Which OpenGL primitive mode draws a connected strip of triangles sharing edges?
GL_TRIANGLE_STRIP reuses two vertices from the previous triangle, efficiently drawing n-2 triangles with n vertices.
3. Which function is used to specify the source and destination blending factors in OpenGL?
glBlendFunc() sets the pixel arithmetic for blending by specifying source and destination factors.
4. What is transform feedback in OpenGL used for?
Transform feedback captures the output of the vertex or geometry shader into VBOs, enabling GPU-side particle systems and physics simulations.
5. Which OpenGL face culling mode keeps only front-facing triangles?
glCullFace(GL_BACK) combined with glEnable(GL_CULL_FACE) discards back-facing triangles, the most common culling setup.
6. What does the ARB suffix in an OpenGL extension name indicate?
ARB extensions are cross-vendor and vetted by the Architecture Review Board; they often become core features in future OpenGL versions.