168 471 computer graphics, kku. lecture 101 introduction to opengl
TRANSCRIPT
168 471 Computer Graphics, KKU. Lecture 10
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Introduction to OpenGL
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OpenGL/GLU/GLUT/GLUI
• OpenGL v1.4 (latest) is the “core” library that is platform independent
• GLUT v3.6 or v3.7 (beta) is an auxiliary library that handles window creation, OS system calls (mouse buttons, movement, keyboard, etc), callbacks.
• GLU is an auxiliary library that handles a variety of graphics accessory functions
• GLUI v1.0 or v2.0 (beta)is a GUI manager written by Paul Rademacher ([email protected]).
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GLUT 3D Primitives
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Double Buffer
• Graphics card scans out the image on the frame buffer. What rate is this done at?
• So what is the problem with this?• You might be in the middle of drawing a frame
when it decides to scan out the image• What is a solution?• Have two separate frame buffers, one that
the card scans out of, and the other you draw into. When you are done drawing a frame, you switch their roles
• What are the memory requirements?
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Double Buffering
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glVertex3f(0.1,0.1,0.1)
glutSwapBuffers();
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Double Buffering...
glVertex3f(0.1,0.1,0.1)
glutSwapBuffers();
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