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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 file for object display routines for rholo drivers. |
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*/ |
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/* additional user commands */ |
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#define DO_LOAD 0 /* load octree object */ |
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#define DO_UNLOAD 1 /* unload (free) octree object */ |
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#define DO_XFORM 2 /* set/print object transform */ |
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#define DO_MOVE 3 /* add to object transform */ |
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#define DO_UNMOVE 4 /* undo last transform change */ |
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#define DO_DUP 5 /* duplicate object */ |
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#define DO_SHOW 6 /* show object (low quality) */ |
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#define DO_LIGHT 7 /* illuminate object (high quality) */ |
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#define DO_HIDE 8 /* hide object */ |
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#define DO_OBJECT 9 /* print object statistics */ |
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#define DO_NCMDS 10 /* number of object display commands */ |
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/* commands entered on stdin only */ |
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#define DO_INIT {"load","clear","xform","move","unmove","dup",\ |
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"show","light","hide","object"} |
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/******************************************************************* |
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* The following routines are available for calling from the driver: |
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int |
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(*dobj_lightsamp)(c, p, v) : apply next sample for local light sources |
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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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If the pointer to the function dobj_lightsamp is non-NULL, then the |
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dev_value() driver routine should call this rather than use a |
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given sample in its own data structures. This pointer is set |
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in the dobj_lighting() function described below, which may be |
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called indirectly by the dobj_command() function. |
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int |
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dobj_command(cmd, args) : check/run object display command |
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char *cmd, *args; : command name and argument string |
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Check to see if this is an object display command, and return -1 if |
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it isn't. If it is a valid command that results in some visible |
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change, return non-zero, otherwise return 0. Error messages should |
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be printed with error(COMMAND,err). |
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double |
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dobj_trace(nm, rorg, rdir) : check for ray intersection with objects |
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char nm[]; : object name (modified) |
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FVECT rorg, rdir; : ray origin and direction |
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Check to see if the given ray intersects the given object, |
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returning the distance the ray traveled if it did, or FHUGE if it didn't. |
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If nm contains "*", then all visible objects are checked and the name |
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of the intersected object is returned, or "" if none. If nm is NULL, |
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then all visible objects are checked, but the name is not returned. |
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int |
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dobj_render() : render visible objects to OpenGL |
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Renders all display objects using OpenGL, assuming desired view has |
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been set. This routine also assumes that the tone-mapping library |
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is being used to set exposure, and it queries this information to |
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adjust light sources as necessary for illuminated objects. Returns |
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the number of objects rendered. |
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void |
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dobj_cleanup() : clean up data structures |
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Frees all allocated data structures and objects. |
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++++ The following routines are usually called through dobj_command() ++++ |
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int |
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dobj_load(oct, nam) : create/load an octree object |
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char *oct, *nam; : octree and object name |
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Load an octree for rendering as a local object, giving it the indicated name. |
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Returns 1 on success, 0 on failure (with COMMAND error message). |
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int |
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dobj_unload(nam) : free the named object |
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char *nam; : object name |
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Free all memory associated with the named object. |
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Returns 1 on success, 0 on failure (with COMMAND error message). |
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int |
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dobj_xform(nam, add, ac, av) : set/add transform for nam |
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char *nam; : object name |
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int add; : add to transform or create new one? |
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int ac; : transform argument count |
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char *av[]; : transform arguments |
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Set or add to the transform for the named object. |
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Returns 1 on success, 0 on failure (with COMMAND error message). |
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int |
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dobj_unmove() : undo last transform change |
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Undo the last transform change. |
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Returns 1 on success, 0 on failure (with COMMAND error message). |
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int |
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dobj_dup(oldnm, nam) : duplicate object oldnm as nam |
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char *oldnm, *nam; |
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Duplicate the named object and give the copy a new name. |
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Returns 1 on success, 0 on failure (with COMMAND error message). |
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int |
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dobj_lighting(nam, cn) : set up lighting for display object |
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char *nam; : object name |
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int cn; : new drawing code |
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Set the lighting of the named object to DO_SHOW, DO_HIDE or DO_LIGHT. |
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Change lighting of all objects if nam is "*". |
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Returns 1 on success, 0 on failure (with COMMAND error message). |
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int |
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dobj_putstats(nam, fp) : print object statistics |
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char *nam; : object name |
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FILE *fp; : output file |
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Print current position, size and transform for the named object, |
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or all objects if nam is "*". |
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Returns 1 on success, 0 on failure (with COMMAND error message). |
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******************************************************************/ |
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extern double dobj_trace(); |
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extern char rhdcmd[DO_NCMDS][8]; |
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extern int (*dobj_lightsamp)(); /* pointer to function to get lights */ |
