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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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/* |
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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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**********************************************************************/ |
