Elance Exams Answers PDF file

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What happens in retained mode?

OpenGL retains extra system memory for execution.
The current OpenGL state can be stored when specified. This is useful if a command fails and execution needs to rollback to a previous state.
Primitives can be redrawn from display lists. Hence, no information is lost.
Once drawn, primative information is lost. To redraw, the primatives are drawn by reexecuting the display function.
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