CSCI-420 Midterm questions and answers.

CSCI-420 Midterm NN




1.OpenGL Library Organization: GL (graphics library): core graphics and
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capabil- ities
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GLUT (graphics and utility lib): input and windowing
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GLEW (GL extension wrangler): removes OS dependencies
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GLU (openGL utility lib): compatibility profile only
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2.Smooth vs Flat Shading: • smooth shading interpolates
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•glShadeModel(GL_FLAT | GL_SMOOTH) NN NN




3.Graphics Pipeline: 1) vertices NN NN NN




2) transformer
3) clipper
4) projector
5) rasterizer
6) pixels
4.The Frame Buffer: special memory on the graphics card. stores the
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current pixels to be displayed on the monitor. monitor has no storage.
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Framebuffer copied to the monitor at each refresh cycle
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5.where is graphics driver code located?: CPU
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6.where are rendering resources located (buffers, shader, textures, etc.): GPU
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7.What is stored in a VBO: vertex positions, normals, texture coordinates,
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8.Glut Program Callbacks Loop:
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9.Types of callbacks: Display(): when window must be
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drawn Idle(): when no other events to be handled
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Keyboard(unsigned char key, int x, int y) : key pressed NN NN NN NN NN NN NN NN NN




Menu(...): after selection from menu
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Mouse(int button, int state, int x, int NN NN NN NN NN NN




y) motion(...) : mouse movement
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reshape(int w, int h): window
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resize
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any callback can be null
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10.screen refresh rate: 60-100Hz NN NN NN




11.double buffering: swap display buffer at end of cycle and start drawing
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