X-Git-Url: https://git.libre-soc.org/?p=mesa.git;a=blobdiff_plain;f=src%2Fglx%2Fglxcmds.c;h=be9d6f29c01e6770dcccfe08eca27d73d355b67e;hp=7cdd42caf028aa989dad0e1cc4011e7a876fdbc7;hb=1fa7789e828d1005e2473fc7cd364bd45eb30843;hpb=ee30e24f5f9cc2ec6c5a3edbe498e5e0334f788b diff --git a/src/glx/glxcmds.c b/src/glx/glxcmds.c index 7cdd42caf02..be9d6f29c01 100644 --- a/src/glx/glxcmds.c +++ b/src/glx/glxcmds.c @@ -39,10 +39,17 @@ #include "glcontextmodes.h" #ifdef GLX_DIRECT_RENDERING +#ifdef GLX_USE_APPLEGL +#include "apple_glx_context.h" +#include "apple_glx.h" +#include "glx_error.h" +#define GC_IS_DIRECT(gc) ((gc)->isDirect) +#else #include #include #include "xf86dri.h" #define GC_IS_DIRECT(gc) ((gc)->driContext != NULL) +#endif #else #define GC_IS_DIRECT(gc) (0) #endif @@ -59,7 +66,7 @@ static const char __glXGLXClientVersion[] = "1.4"; /****************************************************************************/ -#ifdef GLX_DIRECT_RENDERING +#if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL) static Bool windowExistsFlag; static int @@ -344,6 +351,12 @@ AllocateGLXContext(Display * dpy) bufSize = __GLX_MAX_RENDER_CMD_SIZE; } gc->maxSmallRenderCommandSize = bufSize; + +#ifdef GLX_USE_APPLEGL + gc->driContext = NULL; + gc->do_destroy = False; +#endif + return gc; } @@ -366,9 +379,14 @@ CreateContext(Display * dpy, int generic_id, { GLXContext gc; #ifdef GLX_DIRECT_RENDERING +#ifdef GLX_USE_APPLEGL + int errorcode; + bool x11error; +#else __GLXscreenConfigs *const psc = GetGLXScreenConfigs(dpy, screen); #endif - +#endif + if (dpy == NULL) return NULL; @@ -379,6 +397,7 @@ CreateContext(Display * dpy, int generic_id, if (!gc) return NULL; +#ifndef GLX_USE_APPLEGL /* TODO: darwin indirect */ #ifdef GLX_DIRECT_RENDERING if (allowDirect && psc->driScreen) { gc->driContext = psc->driScreen->createContext(psc, fbconfig, gc, @@ -455,10 +474,26 @@ CreateContext(Display * dpy, int generic_id, UnlockDisplay(dpy); SyncHandle(); +#endif gc->imported = GL_FALSE; gc->renderType = renderType; + /* TODO: darwin: Integrate with above to do indirect */ +#ifdef GLX_USE_APPLEGL + if(apple_glx_create_context(&gc->driContext, dpy, screen, fbconfig, + shareList ? shareList->driContext : NULL, + &errorcode, &x11error)) { + __glXSendError(dpy, errorcode, 0, X_GLXCreateContext, x11error); + __glXFreeContext(gc); + return NULL; + } + + gc->currentContextTag = -1; + gc->mode = fbconfig; + gc->isDirect = allowDirect; +#endif + return gc; } @@ -469,7 +504,7 @@ glXCreateContext(Display * dpy, XVisualInfo * vis, const __GLcontextModes *mode = NULL; int renderType = 0; -#ifdef GLX_DIRECT_RENDERING +#if defined(GLX_DIRECT_RENDERING) || defined(GLX_USE_APPLEGL) __GLXscreenConfigs *const psc = GetGLXScreenConfigs(dpy, vis->screen); mode = _gl_context_modes_find_visual(psc->visuals, vis->visualid); @@ -517,6 +552,7 @@ __glXFreeContext(__GLXcontext * gc) static void DestroyContext(Display * dpy, GLXContext gc) { +#ifndef GLX_USE_APPLEGL /* TODO: darwin: indirect */ xGLXDestroyContextReq *req; GLXContextID xid; CARD8 opcode; @@ -542,7 +578,7 @@ DestroyContext(Display * dpy, GLXContext gc) return; } -#ifdef GLX_DIRECT_RENDERING +#if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL) /* Destroy the direct rendering context */ if (gc->driContext) { (*gc->driContext->destroyContext) (gc->driContext, gc->psc, dpy); @@ -552,17 +588,31 @@ DestroyContext(Display * dpy, GLXContext gc) #endif __glXFreeVertexArrayState(gc); +#else + __glXLock(); +#endif /* GLX_USE_APPLEGL */ if (gc->currentDpy) { +#ifdef GLX_USE_APPLEGL + /* + * Set the Bool that indicates that we should destroy this GLX context + * when the context is no longer current. + */ + gc->do_destroy = True; +#endif /* Have to free later cuz it's in use now */ __glXUnlock(); } else { /* Destroy the handle if not current to anybody */ __glXUnlock(); +#ifdef GLX_USE_APPLEGL + if(gc->driContext) + apple_glx_destroy_context(&gc->driContext, dpy); +#endif __glXFreeContext(gc); } - +#ifndef GLX_USE_APPLEGL if (!imported) { /* ** This dpy also created the server side part of the context. @@ -576,6 +626,7 @@ DestroyContext(Display * dpy, GLXContext gc) UnlockDisplay(dpy); SyncHandle(); } +#endif } PUBLIC void @@ -630,7 +681,9 @@ glXQueryExtension(Display * dpy, int *errorBase, int *eventBase) PUBLIC void glXWaitGL(void) { +#ifndef GLX_USE_APPLEGL xGLXWaitGLReq *req; +#endif GLXContext gc = __glXGetCurrentContext(); Display *dpy = gc->currentDpy; @@ -639,8 +692,10 @@ glXWaitGL(void) /* Flush any pending commands out */ __glXFlushRenderBuffer(gc, gc->pc); - -#ifdef GLX_DIRECT_RENDERING +#ifdef GLX_USE_APPLEGL + glFinish(); +#else +#if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL) if (gc->driContext) { int screen; __GLXDRIdrawable *pdraw = @@ -664,6 +719,7 @@ glXWaitGL(void) req->contextTag = gc->currentContextTag; UnlockDisplay(dpy); SyncHandle(); +#endif /* GLX_USE_APPLEGL */ } /* @@ -673,7 +729,9 @@ glXWaitGL(void) PUBLIC void glXWaitX(void) { +#ifndef GLX_USE_APPLEGL xGLXWaitXReq *req; +#endif GLXContext gc = __glXGetCurrentContext(); Display *dpy = gc->currentDpy; @@ -683,7 +741,10 @@ glXWaitX(void) /* Flush any pending commands out */ __glXFlushRenderBuffer(gc, gc->pc); -#ifdef GLX_DIRECT_RENDERING +#ifdef GLX_USE_APPLEGL + apple_glx_waitx(dpy, gc->driContext); +#else +#if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL) if (gc->driContext) { int screen; __GLXDRIdrawable *pdraw = @@ -710,12 +771,15 @@ glXWaitX(void) req->contextTag = gc->currentContextTag; UnlockDisplay(dpy); SyncHandle(); +#endif /* GLX_USE_APPLEGL */ } PUBLIC void glXUseXFont(Font font, int first, int count, int listBase) { +#ifndef GLX_USE_APPLEGL xGLXUseXFontReq *req; +#endif GLXContext gc = __glXGetCurrentContext(); Display *dpy = gc->currentDpy; @@ -724,8 +788,10 @@ glXUseXFont(Font font, int first, int count, int listBase) /* Flush any pending commands out */ (void) __glXFlushRenderBuffer(gc, gc->pc); - -#ifdef GLX_DIRECT_RENDERING +#ifdef GLX_USE_APPLEGL + DRI_glXUseXFont(font, first, count, listBase); +#else +#if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL) if (gc->driContext) { DRI_glXUseXFont(font, first, count, listBase); return; @@ -744,6 +810,7 @@ glXUseXFont(Font font, int first, int count, int listBase) req->listBase = listBase; UnlockDisplay(dpy); SyncHandle(); +#endif /* GLX_USE_APPLEGL */ } /************************************************************************/ @@ -756,6 +823,17 @@ PUBLIC void glXCopyContext(Display * dpy, GLXContext source, GLXContext dest, unsigned long mask) { +#ifdef GLX_USE_APPLEGL + GLXContext gc = __glXGetCurrentContext(); + int errorcode; + bool x11error; + + if(apple_glx_copy_context(gc->driContext, source->driContext, dest->driContext, + mask, &errorcode, &x11error)) { + __glXSendError(dpy, errorcode, 0, X_GLXCopyContext, x11error); + } + +#else xGLXCopyContextReq *req; GLXContext gc = __glXGetCurrentContext(); GLXContextTag tag; @@ -766,7 +844,7 @@ glXCopyContext(Display * dpy, GLXContext source, return; } -#ifdef GLX_DIRECT_RENDERING +#if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL) if (gc->driContext) { /* NOT_DONE: This does not work yet */ } @@ -794,6 +872,7 @@ glXCopyContext(Display * dpy, GLXContext source, req->contextTag = tag; UnlockDisplay(dpy); SyncHandle(); +#endif /* GLX_USE_APPLEGL */ } @@ -808,6 +887,9 @@ glXCopyContext(Display * dpy, GLXContext source, static Bool __glXIsDirect(Display * dpy, GLXContextID contextID) { +#ifndef GLX_USE_APPLEGL /* TODO: apple indirect */ + return GC_IS_DIRECT(gc); +#else #if !defined(USE_XCB) xGLXIsDirectReq *req; xGLXIsDirectReply reply; @@ -843,6 +925,7 @@ __glXIsDirect(Display * dpy, GLXContextID contextID) return reply.isDirect; #endif /* USE_XCB */ +#endif /* GLX_USE_APPLEGL */ } /** @@ -866,6 +949,18 @@ glXIsDirect(Display * dpy, GLXContext gc) PUBLIC GLXPixmap glXCreateGLXPixmap(Display * dpy, XVisualInfo * vis, Pixmap pixmap) { +#ifdef GLX_USE_APPLEGL + int screen = vis->screen; + __GLXscreenConfigs *const psc = GetGLXScreenConfigs(dpy, screen); + const __GLcontextModes *modes; + + modes = _gl_context_modes_find_visual(psc->visuals, vis->visualid); + + if(apple_glx_pixmap_create(dpy, vis->screen, pixmap, modes)) + return None; + + return pixmap; +#else xGLXCreateGLXPixmapReq *req; GLXPixmap xid; CARD8 opcode; @@ -887,7 +982,7 @@ glXCreateGLXPixmap(Display * dpy, XVisualInfo * vis, Pixmap pixmap) UnlockDisplay(dpy); SyncHandle(); -#ifdef GLX_DIRECT_RENDERING +#if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL) do { /* FIXME: Maybe delay __DRIdrawable creation until the drawable * is actually bound to a context... */ @@ -915,6 +1010,7 @@ glXCreateGLXPixmap(Display * dpy, XVisualInfo * vis, Pixmap pixmap) #endif return xid; +#endif } /* @@ -923,6 +1019,10 @@ glXCreateGLXPixmap(Display * dpy, XVisualInfo * vis, Pixmap pixmap) PUBLIC void glXDestroyGLXPixmap(Display * dpy, GLXPixmap glxpixmap) { +#ifdef GLX_USE_APPLEGL + if(apple_glx_pixmap_destroy(dpy, glxpixmap)) + __glXSendError(dpy, GLXBadPixmap, glxpixmap, X_GLXDestroyPixmap, false); +#else xGLXDestroyGLXPixmapReq *req; CARD8 opcode; @@ -940,7 +1040,7 @@ glXDestroyGLXPixmap(Display * dpy, GLXPixmap glxpixmap) UnlockDisplay(dpy); SyncHandle(); -#ifdef GLX_DIRECT_RENDERING +#if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL) { int screen; __GLXdisplayPrivate *const priv = __glXInitialize(dpy); @@ -953,11 +1053,20 @@ glXDestroyGLXPixmap(Display * dpy, GLXPixmap glxpixmap) } } #endif +#endif /* GLX_USE_APPLEGL */ } PUBLIC void glXSwapBuffers(Display * dpy, GLXDrawable drawable) { +#ifdef GLX_USE_APPLEGL + GLXContext gc = glXGetCurrentContext(); + if(gc && apple_glx_is_current_drawable(dpy, gc->driContext, drawable)) { + apple_glx_swap_buffers(gc->driContext); + } else { + __glXSendError(dpy, GLXBadCurrentWindow, 0, X_GLXSwapBuffers, false); + } +#else GLXContext gc; GLXContextTag tag; CARD8 opcode; @@ -967,7 +1076,7 @@ glXSwapBuffers(Display * dpy, GLXDrawable drawable) xGLXSwapBuffersReq *req; #endif -#ifdef GLX_DIRECT_RENDERING +#if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL) __GLXDRIdrawable *pdraw = GetGLXDRIDrawable(dpy, drawable, NULL); if (pdraw != NULL) { @@ -1012,6 +1121,7 @@ glXSwapBuffers(Display * dpy, GLXDrawable drawable) SyncHandle(); XFlush(dpy); #endif /* USE_XCB */ +#endif /* GLX_USE_APPLEGL */ } @@ -1110,6 +1220,13 @@ init_fbconfig_for_chooser(__GLcontextModes * config, } \ } while ( 0 ) +/* Test that all bits from a are contained in b */ +#define MATCH_MASK(param) \ + do { \ + if ((a->param & ~b->param) != 0) \ + return False; \ + } while (0); + /** * Determine if two GLXFBConfigs are compatible. * @@ -1148,11 +1265,8 @@ fbconfigs_compatible(const __GLcontextModes * const a, MATCH_DONT_CARE(stereoMode); MATCH_EXACT(level); - if (((a->drawableType & b->drawableType) == 0) - || ((a->renderType & b->renderType) == 0)) { - return False; - } - + MATCH_MASK(drawableType); + MATCH_MASK(renderType); /* There is a bug in a few of the XFree86 DDX drivers. They contain * visuals with a "transparent type" of 0 when they really mean GLX_NONE. @@ -1436,6 +1550,12 @@ glXChooseVisual(Display * dpy, int screen, int *attribList) } } +#ifdef GLX_USE_APPLEGL + if(visualList && getenv("LIBGL_DUMP_VISUALID")) { + printf("visualid 0x%lx\n", visualList[0].visualid); + } +#endif + return visualList; } @@ -1458,7 +1578,7 @@ glXQueryExtensionsString(Display * dpy, int screen) } __glXCalculateUsableExtensions(psc, -#ifdef GLX_DIRECT_RENDERING +#if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL) (psc->driScreen != NULL), #else GL_FALSE, @@ -1569,6 +1689,7 @@ PUBLIC GLX_ALIAS(Display *, glXGetCurrentDisplayEXT, (void), (), glXGetCurrentDisplay) +#ifndef GLX_USE_APPLEGL /** * Used internally by libGL to send \c xGLXQueryContextinfoExtReq requests * to the X-server. @@ -1680,13 +1801,16 @@ static int __glXQueryContextInfo(Display * dpy, GLXContext ctx) return retval; } +#endif + PUBLIC int glXQueryContext(Display * dpy, GLXContext ctx, int attribute, int *value) { +#ifndef GLX_USE_APPLEGL int retVal; /* get the information from the server if we don't have it already */ -#ifdef GLX_DIRECT_RENDERING +#if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL) if (!ctx->driContext && (ctx->mode == NULL)) { #else if (ctx->mode == NULL) { @@ -1695,13 +1819,17 @@ glXQueryContext(Display * dpy, GLXContext ctx, int attribute, int *value) if (Success != retVal) return retVal; } +#endif + switch (attribute) { - case GLX_SHARE_CONTEXT_EXT: +#ifndef GLX_USE_APPLEGL + case GLX_SHARE_CONTEXT_EXT: *value = (int) (ctx->share_xid); break; case GLX_VISUAL_ID_EXT: *value = ctx->mode ? ctx->mode->visualID : None; break; +#endif case GLX_SCREEN: *value = (int) (ctx->screen); break; @@ -1730,6 +1858,9 @@ PUBLIC GLXContextID glXGetContextIDEXT(const GLXContext ctx) PUBLIC GLXContext glXImportContextEXT(Display * dpy, GLXContextID contextID) { +#ifdef GLX_USE_APPLEGL + return NULL; +#else GLXContext ctx; if (contextID == None) { @@ -1750,6 +1881,7 @@ glXImportContextEXT(Display * dpy, GLXContextID contextID) } } return ctx; +#endif } PUBLIC void @@ -1877,7 +2009,7 @@ glXGetVisualFromFBConfig(Display * dpy, GLXFBConfig config) return XGetVisualInfo(dpy, VisualIDMask, &visualTemplate, &count); } - +#ifndef GLX_USE_APPLEGL /* ** GLX_SGI_swap_control */ @@ -2232,6 +2364,7 @@ __glXWaitVideoSyncSGI(int divisor, int remainder, unsigned int *count) return GLX_BAD_CONTEXT; } +#endif /* GLX_USE_APPLEGL */ /* ** GLX_SGIX_fbconfig @@ -2258,17 +2391,24 @@ glXCreateGLXPixmapWithConfigSGIX(Display * dpy, GLXFBConfigSGIX config, Pixmap pixmap) { +#ifndef GLX_USE_APPLEGL xGLXVendorPrivateWithReplyReq *vpreq; xGLXCreateGLXPixmapWithConfigSGIXReq *req; GLXPixmap xid = None; CARD8 opcode; - const __GLcontextModes *const fbconfig = (__GLcontextModes *) config; __GLXscreenConfigs *psc; +#endif + const __GLcontextModes *const fbconfig = (__GLcontextModes *) config; if ((dpy == NULL) || (config == NULL)) { return None; } +#ifdef GLX_USE_APPLEGL + if(apple_glx_pixmap_create(dpy, fbconfig->screen, pixmap, fbconfig)) + return None; + return pixmap; +#else psc = GetGLXScreenConfigs(dpy, fbconfig->screen); if ((psc != NULL) @@ -2296,6 +2436,7 @@ glXCreateGLXPixmapWithConfigSGIX(Display * dpy, } return xid; +#endif } PUBLIC GLXContext @@ -2341,7 +2482,7 @@ glXGetFBConfigFromVisualSGIX(Display * dpy, XVisualInfo * vis) return NULL; } - +#ifndef GLX_USE_APPLEGL /* ** GLX_SGIX_swap_group */ @@ -2416,7 +2557,7 @@ __glXGetSyncValuesOML(Display * dpy, GLXDrawable drawable, return False; } -#ifdef GLX_DIRECT_RENDERING +#if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL) _X_HIDDEN GLboolean __driGetMscRateOML(__DRIdrawable * draw, int32_t * numerator, int32_t * denominator, void *private) @@ -2872,7 +3013,7 @@ __glXBindTexImageEXT(Display * dpy, i++; } -#ifdef GLX_DIRECT_RENDERING +#if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL) if (gc->driContext) { __GLXDRIdrawable *pdraw = GetGLXDRIDrawable(dpy, drawable, NULL); @@ -2962,6 +3103,8 @@ __glXReleaseTexImageEXT(Display * dpy, GLXDrawable drawable, int buffer) /*@}*/ +#endif /* GLX_USE_APPLEGL */ + /** * \c strdup is actually not a standard ANSI C or POSIX routine. * Irix will not define it if ANSI mode is in effect. @@ -3039,6 +3182,7 @@ static const struct name_address_pair GLX_functions[] = { GLX_FUNCTION(glXQueryDrawable), GLX_FUNCTION(glXSelectEvent), +#ifndef GLX_USE_APPLEGL /*** GLX_SGI_swap_control ***/ GLX_FUNCTION2(glXSwapIntervalSGI, __glXSwapIntervalSGI), @@ -3056,6 +3200,7 @@ static const struct name_address_pair GLX_functions[] = { GLX_FUNCTION2(glXGetCurrentDisplayEXT, glXGetCurrentDisplay), GLX_FUNCTION(glXImportContextEXT), GLX_FUNCTION2(glXQueryContextInfoEXT, glXQueryContext), +#endif /*** GLX_SGIX_fbconfig ***/ GLX_FUNCTION2(glXGetFBConfigAttribSGIX, glXGetFBConfigAttrib), @@ -3065,6 +3210,7 @@ static const struct name_address_pair GLX_functions[] = { GLX_FUNCTION2(glXGetVisualFromFBConfigSGIX, glXGetVisualFromFBConfig), GLX_FUNCTION(glXGetFBConfigFromVisualSGIX), +#ifndef GLX_USE_APPLEGL /*** GLX_SGIX_pbuffer ***/ GLX_FUNCTION(glXCreateGLXPbufferSGIX), GLX_FUNCTION(glXDestroyGLXPbufferSGIX), @@ -3102,6 +3248,7 @@ static const struct name_address_pair GLX_functions[] = { GLX_FUNCTION2(glXEndFrameTrackingMESA, __glXEndFrameTrackingMESA), GLX_FUNCTION2(glXGetFrameUsageMESA, __glXGetFrameUsageMESA), GLX_FUNCTION2(glXQueryFrameTrackingMESA, __glXQueryFrameTrackingMESA), +#endif /*** GLX_ARB_get_proc_address ***/ GLX_FUNCTION(glXGetProcAddressARB), @@ -3109,6 +3256,7 @@ static const struct name_address_pair GLX_functions[] = { /*** GLX 1.4 ***/ GLX_FUNCTION2(glXGetProcAddress, glXGetProcAddressARB), +#ifndef GLX_USE_APPLEGL /*** GLX_OML_sync_control ***/ GLX_FUNCTION2(glXWaitForSbcOML, __glXWaitForSbcOML), GLX_FUNCTION2(glXWaitForMscOML, __glXWaitForMscOML), @@ -3119,8 +3267,9 @@ static const struct name_address_pair GLX_functions[] = { /*** GLX_EXT_texture_from_pixmap ***/ GLX_FUNCTION2(glXBindTexImageEXT, __glXBindTexImageEXT), GLX_FUNCTION2(glXReleaseTexImageEXT, __glXReleaseTexImageEXT), +#endif -#ifdef GLX_DIRECT_RENDERING +#if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL) /*** DRI configuration ***/ GLX_FUNCTION(glXGetScreenDriver), GLX_FUNCTION(glXGetDriverConfig), @@ -3129,7 +3278,7 @@ static const struct name_address_pair GLX_functions[] = { {NULL, NULL} /* end of list */ }; - +#ifndef GLX_USE_APPLEGL static const GLvoid * get_glx_proc_address(const char *funcName) { @@ -3143,7 +3292,7 @@ get_glx_proc_address(const char *funcName) return NULL; } - +#endif /** * Get the address of a named GL function. This is the pre-GLX 1.4 name for @@ -3166,13 +3315,15 @@ PUBLIC void (*glXGetProcAddressARB(const GLubyte * procName)) (void) * DRI based drivers from searching the core GL function table for * internal API functions. */ - +#ifdef GLX_USE_APPLEGL + f = (gl_function) apple_glx_get_proc_address(procName); +#else f = (gl_function) get_glx_proc_address((const char *) procName); if ((f == NULL) && (procName[0] == 'g') && (procName[1] == 'l') && (procName[2] != 'X')) { f = (gl_function) _glapi_get_proc_address((const char *) procName); } - +#endif return f; } @@ -3195,7 +3346,7 @@ PUBLIC void (*glXGetProcAddress(const GLubyte * procName)) (void) #endif /* __GNUC__ */ -#ifdef GLX_DIRECT_RENDERING +#if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL) /** * Get the unadjusted system time (UST). Currently, the UST is measured in * microseconds since Epoc. The actual resolution of the UST may vary from