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gregl |
3.1 |
/* 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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gregl |
3.2 |
#define DEV_WAIT 010 /* pause computation and wait for input */
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gregl |
3.3 |
#define DEV_RESUME 020 /* resume after pause */
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gregl |
3.1 |
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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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************************************************************************/
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