-/* $Id: glapi.c,v 1.48 2000/11/22 07:32:17 joukj Exp $ */
+/* $Id: glapi.c,v 1.49 2001/01/23 23:35:47 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.5
*
- * Copyright (C) 1999-2000 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* based libGL.so, and perhaps the SGI SI.
*
* There are no dependencies on Mesa in this code.
+ *
+ * Versions (API changes):
+ * 2000/02/23 - original version for Mesa 3.3 and XFree86 4.0
+ * 2001/01/16 - added dispatch override feature for Mesa 3.5
*/
#include "glapitable.h"
#include "glthread.h"
-#if defined(MESA_TRACE)
-#include "mtypes.h"
-#endif
-
/* This is used when thread safety is disabled */
struct _glapi_table *_glapi_Dispatch = (struct _glapi_table *) __glapi_noop_table;
+struct _glapi_table *_glapi_RealDispatch = (struct _glapi_table *) __glapi_noop_table;
/* Used when thread safety disabled */
void *_glapi_Context = NULL;
static GLboolean ThreadSafe = GL_FALSE;
static _glthread_TSD DispatchTSD;
+static _glthread_TSD RealDispatchTSD; /* only when using override */
static _glthread_TSD ContextTSD;
static GLuint MaxDispatchOffset = sizeof(struct _glapi_table) / sizeof(void *) - 1;
static GLboolean GetSizeCalled = GL_FALSE;
+static GLboolean DispatchOverride = GL_FALSE;
+
+
+
/* strdup is actually not a standard ANSI C or POSIX routine
Irix will not define it if ANSI mode is in effect. */
static char *str_dup(const char *str)
void
_glapi_set_dispatch(struct _glapi_table *dispatch)
{
-#if defined(MESA_TRACE)
- GLcontext * ctx;
-#endif
-
if (!dispatch) {
/* use the no-op functions */
dispatch = (struct _glapi_table *) __glapi_noop_table;
#endif
#if defined(THREADS)
-#if defined(MESA_TRACE)
- ctx = (GLcontext *)_glthread_GetTSD(&ContextTSD);
- if (ctx->TraceCtx->traceEnabled == GL_TRUE) {
- _glthread_SetTSD(&DispatchTSD, (void *) ctx->TraceDispatch);
+ if (DispatchOverride) {
+ _glthread_SetTSD(&RealDispatchTSD, (void *) dispatch);
if (ThreadSafe)
- _glapi_Dispatch = NULL;
+ _glapi_RealDispatch = NULL;
else
- _glapi_Dispatch = ctx->TraceDispatch;
+ _glapi_RealDispatch = dispatch;
}
else {
+ /* normal operation */
_glthread_SetTSD(&DispatchTSD, (void *) dispatch);
if (ThreadSafe)
_glapi_Dispatch = NULL;
else
_glapi_Dispatch = dispatch;
}
-#else
- _glthread_SetTSD(&DispatchTSD, (void *) dispatch);
- if (ThreadSafe)
- _glapi_Dispatch = NULL;
- else
- _glapi_Dispatch = dispatch;
-#endif /*MESA_TRACE*/
#else /*THREADS*/
-#if defined(MESA_TRACE)
- ctx = (GLcontext *)_glthread_GetTSD(&ContextTSD);
- _glapi_Dispatch = ctx->TraceDispatch;
-#else
- _glapi_Dispatch = dispatch;
-#endif /*MESA_TRACE*/
+ if (DispatchOverride) {
+ _glapi_RealDispatch = dispatch;
+ }
+ else {
+ _glapi_Dispatch = dispatch;
+ }
#endif /*THREADS*/
}
{
#if defined(THREADS)
if (ThreadSafe) {
- return (struct _glapi_table *) _glthread_GetTSD(&DispatchTSD);
+ if (DispatchOverride) {
+ return (struct _glapi_table *) _glthread_GetTSD(&RealDispatchTSD);
+ }
+ else {
+ return (struct _glapi_table *) _glthread_GetTSD(&DispatchTSD);
+ }
}
else {
- assert(_glapi_Dispatch);
- return _glapi_Dispatch;
+ if (DispatchOverride) {
+ assert(_glapi_RealDispatch);
+ return _glapi_RealDispatch;
+ }
+ else {
+ assert(_glapi_Dispatch);
+ return _glapi_Dispatch;
+ }
}
#else
return _glapi_Dispatch;
}
-#if defined(MESA_TRACE)
-struct _glapi_table *
-_glapi_get_true_dispatch(void)
+/*
+ * Notes on dispatch overrride:
+ *
+ * Dispatch override allows an external agent to hook into the GL dispatch
+ * mechanism before execution goes into the core rendering library. For
+ * example, a trace mechanism would insert itself as an overrider, print
+ * logging info for each GL function, then dispatch to the real GL function.
+ *
+ * libGLS (GL Stream library) is another agent that might use override.
+ *
+ * We don't allow more than one layer of overriding at this time.
+ * In the future we may allow nested/layered override. In that case
+ * _glapi_begin_dispatch_override() will return an override layer,
+ * _glapi_end_dispatch_override(layer) will remove an override layer
+ * and _glapi_get_override_dispatch(layer) will return the dispatch
+ * table for a given override layer. layer = 0 will be the "real"
+ * dispatch table.
+ */
+
+/*
+ * Return: dispatch override layer number.
+ */
+int
+_glapi_begin_dispatch_override(struct _glapi_table *override)
{
- GLcontext* ctx;
+ struct _glapi_table *real = _glapi_get_dispatch();
+
+ assert(!DispatchOverride); /* can't nest at this time */
+ DispatchOverride = GL_TRUE;
+
+ _glapi_set_dispatch(real);
#if defined(THREADS)
- if (ThreadSafe) {
- ctx = (GLcontext *) _glthread_GetTSD(&ContextTSD);
- assert(ctx);
- assert(ctx->CurrentDispatch);
- return ctx->CurrentDispatch;
+ _glthread_SetTSD(&DispatchTSD, (void *) override);
+ if (ThreadSafe)
+ _glapi_Dispatch = NULL;
+ else
+ _glapi_Dispatch = override;
+#else
+ _glapi_Dispatch = override;
+#endif
+ return 1;
+}
+
+
+void
+_glapi_end_dispatch_override(int layer)
+{
+ struct _glapi_table *real = _glapi_get_dispatch();
+ (void) layer;
+ DispatchOverride = GL_FALSE;
+ _glapi_set_dispatch(real);
+ /* the rest of this isn't needed, just play it safe */
+#if defined(THREADS)
+ _glthread_SetTSD(&RealDispatchTSD, NULL);
+#endif
+ _glapi_RealDispatch = NULL;
+}
+
+
+struct _glapi_table *
+_glapi_get_override_dispatch(int layer)
+{
+ if (layer == 0) {
+ return _glapi_get_dispatch();
}
else {
- assert(_glapi_Context);
- assert(((GLcontext *)_glapi_Context)->CurrentDispatch);
- return ((GLcontext *)_glapi_Context)->CurrentDispatch;
- }
+ if (DispatchOverride) {
+#if defined(THREADS)
+ return (struct _glapi_table *) _glthread_GetTSD(&DispatchTSD);
#else
- assert(_glapi_Context);
- assert(((GLcontext *)_glapi_Context)->CurrentDispatch);
- return ((GLcontext *)_glapi_Context)->CurrentDispatch;
+ return _glapi_Dispatch;
#endif
+ }
+ else {
+ return NULL;
+ }
+ }
}
-#endif /* MESA_TRACE */
+
/*
const char *
_glapi_get_version(void)
{
- return "20001026"; /* YYYYMMDD */
+ return "20010116"; /* YYYYMMDD */
}
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