VEGA实用编程手册2

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更多发布于：2006-04-04 14:16

<H2 >Vega Common API</H2>
Vega Common Class functions (vgCommon) apply to most Vega Classes ; instances. 
 
<H3 >Vega Common Functions</H3>
 
int vgGetType (vgCommon *handle);
 
void vgName (vgCommon *handle, const char *name); 
Void vgGetName (vgCommon *handle, char *str);
int vgGetNameLen (vgCommon *handle);
 
void vgDelete (vgCommon *handle);
 
void vgUpdate (vgCommon *handle);
 updates a Vega instance
 
ERR vgProp (vgCommon *handle, int which, float prop);
 sets the property of an instance
Float vgGetProp (vgCommon *handle, int which); 
 returns the current property of an instance
 
void vgCopy (vgCommon *dest, vgCommon *src);
 copies the source instance to the destination instancevoid 
 
vgPrint (vgCommon *handle);
 
void vgUserData (vgCommon *handle, void *data); 
void *vgGetUserData (vgCommon *handle);
 
void vgWriteADF (vgCommon *handle, int token, FILE *fp); 
 
void vgAddFunc (vgCommon *handle, int which, vgCallback *func, void *data); 
 adds a callback function to a Vega instance
 
void vgDelFunc (vgCommon *handle, int which, vgCallback *func, void *udata); 
 removes a callback function from a Vega instance
<H3 >Vega Common Function Callback Events</H3>
VGCOMMON_POS - called when item is positioned
VGCOMMON_DELETE - before the item is deleted
VGCOMMON_COPY - call on dest, item before copy
VGCOMMON_STATE - call when item state is changed
VGCOMMON_PRINT - call when class is printed
VGCOMMON_NEW - call when class is instanced
VGCOMMON_POSTUPDATE - call after item is updated
<H2 >The Vega System (vgSystems)</H2>
The Vega System Functions (vgSystems) allow the user to initialize, define, configure, and control the real-time processing of Vega. The target platform is defined by setting values for the number of processors, priorities of the processes, and synchronization algorithms.
<H3 >Vega System Functions</H3>
vgSystem *vgInitSys(void);
 initializes the Vega, creates a shared memory arena, initializes Performer
void vgDefineSys (const char * adfname); 
 reads the ADF specified
void vgCongigSys (void);
 makes the associations between the instances
void vgSyncFrame (void); 
 synchronization and culling
void vgFrame (void);
 rendering the scene
vgSystem *vgGetsys (void); 
 retrieves a pointer to the system
void vgExit (int); 
void vgUserExit (int (*usrexit) (int)); 
void vgExitKey (int key);
double vgGetTime (void); 
double vgGetRunTime (void); 
double vgGetFrameTime (void);
double vgGetDeltaFrameTime (void);
<H3 >A Vega Program</H3>
vgInitSys();
vgDefineSys (“my_adf.adf”);
vgConfigSys(); 
 
while (true)
{
 vgSyncFrame();
 vgFrame();
}
<H3 >Vega System 回调函数</H3>
VGSYS_PRESYSNC --called before pfSync
VGSYS_POSTSYNC --called after pfSync
VGSYS_PROFRAME --called before pfFrame
VGSYS_POSTFRAME --called after pfFrame
<H3 >Vega System Properties and Property Values</H3>
VGSYS_MPMODE – sets the multiprocessing mode
VGSYS_PHASE – specific the synchronize method to use
VGSYS_FRAMERATE – frame rate
VGSYS_APPCPU – sets the app on a specific CPU
VGSYS_APPPRI – set the process priority
VGSYS_ISECTPROC – enable/disable async isect process
VGSYS_ISECTCPU – sets the intersection target CPU
VGSYS_ISECTPRI – sets the intersection priority
VGSYS_DBPROC – enable/disable async database process
VGSYS_DBCPU – sets the database process target CPU
VGSYS_DBPRI – sets the database process priority
VGSYS_NUMSTAGES -number of pipeline stages
VGSYS_NUMBUFFERS -number of mulitbuffers used
VGSYS_CURBUFFEREDID -index of the current buffer
VGSYS_GRAPHICS - enable/disable graphics
VGSYS_FPERROR - enable/disable floating point error detection
VGSYS_CONFIGVEGA - enable/disable configuring Vega from vgConfigSys
VGSYS_APPINPUT - enable/disable the input during the APP process
VGSYS_DISABLE_CLOCKS - all non-system processors have clock interrupts disabled for faster execution
VGSYS_PRELOAD_TEX - enable or disable preloading of textures 
VGSYS_PRELOAD_PAGETEX- enable/disable preloading of pageable textures
VGSYS_TEX_PAGESIZE - number of bytes to download per frame when loading pagable textures VGSYS_SORT_TEX - sort textures by number of components

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VEGA实用编程手册2

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