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/* Copyright (c) 1998 Silicon Graphics, Inc. */
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/* SCCSid "$SunId$ SGI" */
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/*
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* Header for OpenGL cone drawing routines with depth buffer checks.
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*/
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#undef NOPROTO
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#define NOPROTO 1
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#include "color.h"
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#include "tonemap.h"
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#include "rhdriver.h"
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#ifndef int4
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#define int4 int
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#endif
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extern struct ODview {
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int sfirst, snext; /* first sample and first in next view */
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short hhi, vhi; /* screen image resolution */
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short hlow, vlow; /* block resolution */
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int n2redraw; /* approx. number of samples needing redraw */
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struct ODblock {
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short nsamp; /* number of samples in block */
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short nused; /* number actually allocated */
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int first; /* first sample in this block */
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int free; /* index for block free list */
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float pthresh; /* proximity threshold */
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} *bmap; /* low resolution image map */
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int4 *emap; /* low resolution edge presence map */
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int4 *pmap; /* high resolution presence map */
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GLfloat *dmap; /* high resolution depth map */
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} *odView; /* our view list */
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extern int odNViews; /* number of views in our list */
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extern struct ODsamp {
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union ODfunion {
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float prox; /* viewpoint proximity */
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int4 next; /* next in free list */
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} *f; /* free list next or proximity */
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short (*ip)[2]; /* image position array */
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TMbright *brt; /* encoded brightness array */
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BYTE (*chr)[3]; /* encoded chrominance array */
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BYTE (*rgb)[3]; /* tone-mapped color array */
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int4 *redraw; /* redraw flags */
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int nsamp; /* total number of samples */
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char *base; /* base of allocated memory */
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} odS; /* sample values */
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#ifndef FL4OP
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#define FL4OP(f,i,op) ((f)[(i)>>5] op (1L<<((i)&0x1f)))
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#define CHK4(f,i) FL4OP(f,i,&)
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#define SET4(f,i) FL4OP(f,i,|=)
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#define CLR4(f,i) FL4OP(f,i,&=~)
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#define TGL4(f,i) FL4OP(f,i,^=)
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#define FL4NELS(n) (((n)+0x1f)>>5)
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#define CLR4ALL(f,n) bzero((char *)(f),FL4NELS(n)*sizeof(int4))
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#endif
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#define OMAXDEPTH 32000 /* maximum depth value */
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#define nextfree(i) f[i].next /* free pointers */
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#define closeness(i) f[i].prox /* viewpoint proximity */
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#define ENDFREE (-1) /* free list terminator */
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#define odClean() odInit(odS.nsamp) /* clear samples */
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#define odDone() odInit(0) /* free samples */
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/*****************************************************************************
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* Interface routines:
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int
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odInit(nsamps) : allocate and initialize memory
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int nsamps; : number of samples to make available
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If nsamps is zero, then this becomes a deallocation routine. If nsamps
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is the same as last time, then this merely clears all data. The dev_auxview()
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function may be called to determine the current view(s). The odAlloc()
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function returns the number of samples actually allocated.
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void
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odSample(c, d, p) : register new sample value
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COLR c; : pixel color (RGBE)
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FVECT d; : ray direction vector
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FVECT p; : world intersection point
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If p is NULL, then the point is at infinity.
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void
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odDepthMap(vn, dm) : set depth map for the given view
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int vn; : view number
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GLfloat *dm; : depth map
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Assign the depth map associated with view number vn. The map has
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been preallocated, and won't be freed until it is no longer needed
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(after an odAlloc() call). All depth values are the projected
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distance along the view direction from the view origin. If dm
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is NULL, then there is no depth map associated with this view.
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void
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odRedraw(vn, x0, y0, x1, y1) : region needs to be redrawn
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int vn; : view number
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int x0, y0, x1, y1; : rectangle to redraw
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This call indicates that the given rectangular region in view vn
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needs to be redrawn in the next call to odUpdate().
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void
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odRedrawAll() : everything needs to be redrawn
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Redraw everything in all views on the next call to odUpdate().
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Unless odRemap() is called, no new tone mapping will be done.
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void
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odUpdate(vn) : update the current view
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int vn; : view number
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Draw all new and undrawn sample values since last call for this view.
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void
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odRemap(newhist) : recompute tone mapping
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int newhist; : flag whether to clear history
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Recompute the tone mapping for all the samples in all the views
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and redraw them on the next call(s) to odUpdate(). If newhist
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is non-zero, then clear the previous sample history.
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**********************************************************************/
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