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/* Copyright (c) 1997 Silicon Graphics, Inc. */ |
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/* SCCSid "$SunId$ SGI" */ |
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/* |
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* Header file for holodeck device driver routines. |
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*/ |
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#include "view.h" |
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extern struct driver { |
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char *name; /* holodeck name or title */ |
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VIEW v; /* preferred view parameters */ |
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int hres, vres; /* device resolution */ |
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int ifd; /* input file descriptor (for select) */ |
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} odev; /* our open device */ |
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/* dev_input() return flags */ |
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#define DEV_SHUTDOWN 01 /* user shutdown request */ |
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#define DEV_NEWVIEW 02 /* view change (new view in odev.v) */ |
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#define DEV_NEWSIZE 04 /* device resolution change */ |
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#define DEV_WAIT 010 /* pause computation and wait for input */ |
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#define DEV_RESUME 020 /* resume after pause */ |
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/************************************************************************ |
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* Driver routines (all are required): |
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void |
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dev_open(nm) : prepare the device |
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char *nm; : appropriate title bar annotation |
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Sets fields of odev structure and prepares the display for i/o. |
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The view type, horizontal and vertical view angles and other default |
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parameters in odev.v should also be assigned. |
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void |
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dev_view(nv) : set display view parameters |
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VIEW *nv; : the new view |
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Updates the display for the given view change. |
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Look for nv==&odev.v when making view current after dev_input() |
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returns DEV_NEWVIEW flag. |
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void |
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dev_value(c, p) : register new point of light |
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COLR c; : pixel color (RGBE) |
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FVECT p; : world intersection point |
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Add the given color point to the display output queue. |
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int |
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dev_flush() : flush the output and prepare for select call |
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Updates display, taking any pending action required before select(2) call. |
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Returns non-zero if there is device input available. |
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int |
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dev_input() : process pending display input |
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Called when odev struct file descriptor shows input is ready. |
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Returns flags indicating actions to take in the control process. |
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If the DEV_NEWVIEW or DEV_NEWSIZE flag is returned, the odev |
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structure must be updated beforehand. |
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void |
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dev_close() : close the display |
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Close the display device and free up resources in preparation for exit. |
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Set odev.v.type=0 and odev.hres=odev.vres=0 when done. |
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************************************************************************/ |
