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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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/* user commands */ |
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#define DC_SETVIEW 0 /* set the view */ |
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#define DC_GETVIEW 1 /* print the current view */ |
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#define DC_LASTVIEW 2 /* restore previous view */ |
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#define DC_PAUSE 3 /* pause the current calculation */ |
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#define DC_RESUME 4 /* resume the calculation */ |
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#define DC_REDRAW 5 /* redraw from server */ |
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#define DC_QUIT 6 /* quit the program */ |
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#define DC_NCMDS 7 /* number of commands */ |
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/* dev_input() returns flags from above */ |
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#define DFL(dc) (1<<(dc)) |
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#define CTRL(c) ((c)-'@') |
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/* commands entered in display window */ |
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#define DV_INIT {'\0','v','l','p','\r',CTRL('R'),'q'} |
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/* commands entered on stdin */ |
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#define DC_INIT {"VIEW=","where","last","pause","resume","redraw",\ |
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"quit"} |
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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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int |
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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. Return 1 on success, or 0 if the |
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new view would conflict with device requirements. In the latter |
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case, reset parameters in nv to make it more agreeable, calling |
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error(COMMAND, "appropriate user warning"). |
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void |
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dev_value(c, p, v) : 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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FVECT v; : ray direction vector |
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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 DC_VIEW or DC_RESIZE 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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************************************************************************/ |
