glx: split out current context code

also clean header inclusion after code movement

7 files changed, 538 insertions, 521 deletions

diff --git a/src/glx/x11/Makefile b/src/glx/x11/Makefile
index 2d44e8df7a1..56b46803b10 100644
--- a/src/glx/x11/Makefile
+++ b/src/glx/x11/Makefile
@@ -10,6 +10,7 @@ SOURCES = \
 	  compsize.c \
 	  eval.c \
 	  glxcmds.c \
+	  glxcurrent.c \
 	  glxext.c \
 	  glxextensions.c \
 	  indirect.c \
diff --git a/src/glx/x11/dri2_glx.c b/src/glx/x11/dri2_glx.c
index 1a6abaedab8..66d2163bd5a 100644
--- a/src/glx/x11/dri2_glx.c
+++ b/src/glx/x11/dri2_glx.c
@@ -33,20 +33,15 @@
 #ifdef GLX_DIRECT_RENDERING
 
 #include <unistd.h>
-#include <X11/Xlibint.h>
-#include <X11/extensions/Xext.h>
-#include <X11/extensions/extutil.h>
 #include <X11/extensions/Xfixes.h>
 #include <X11/extensions/Xdamage.h>
 #include "glheader.h"
 #include "glxclient.h"
+#include "glcontextmodes.h"
 #include "xf86dri.h"
 #include "sarea.h"
-#include <stdio.h>
 #include <dlfcn.h>
 #include <sys/types.h>
-#include <stdarg.h>
-#include "glcontextmodes.h"
 #include <sys/mman.h>
 #include "xf86drm.h"
 #include "dri2.h"
diff --git a/src/glx/x11/dri_glx.c b/src/glx/x11/dri_glx.c
index 70873c2cc41..997b0fdf475 100644
--- a/src/glx/x11/dri_glx.c
+++ b/src/glx/x11/dri_glx.c
@@ -35,20 +35,15 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #ifdef GLX_DIRECT_RENDERING
 
 #include <unistd.h>
-#include <X11/Xlibint.h>
-#include <X11/extensions/Xext.h>
-#include <X11/extensions/extutil.h>
 #include <X11/extensions/Xfixes.h>
 #include <X11/extensions/Xdamage.h>
 #include "glheader.h"
 #include "glxclient.h"
+#include "glcontextmodes.h"
 #include "xf86dri.h"
 #include "sarea.h"
-#include <stdio.h>
 #include <dlfcn.h>
 #include <sys/types.h>
-#include <stdarg.h>
-#include "glcontextmodes.h"
 #include <sys/mman.h>
 #include "xf86drm.h"
 
diff --git a/src/glx/x11/glxclient.h b/src/glx/x11/glxclient.h
index 5fd64209df5..d19cc04d077 100644
--- a/src/glx/x11/glxclient.h
+++ b/src/glx/x11/glxclient.h
@@ -160,8 +160,6 @@ extern const char *glXGetScreenDriver (Display *dpy, int scrNum);
 
 extern const char *glXGetDriverConfig (const char *driverName);
 
-extern Bool __glXWindowExists(Display *dpy, GLXDrawable draw);
-
 #endif
 
 /************************************************************************/
@@ -572,8 +570,6 @@ struct __GLXdisplayPrivateRec {
 };
 
 
-void __glXFreeContext(__GLXcontext*);
-
 extern GLubyte *__glXFlushRenderBuffer(__GLXcontext*, GLubyte*);
 
 extern void __glXSendLargeChunk(__GLXcontext *gc, GLint requestNumber, 
@@ -616,6 +612,10 @@ extern __GLXcontext *__glXcurrentContext;
 
 #endif /* defined( USE_XTHREADS ) || defined( PTHREADS ) */
 
+extern void __glXSetCurrentContextNull(void);
+
+extern void __glXFreeContext(__GLXcontext*);
+
 
 /*
 ** Global lock for all threads in this address space using the GLX
diff --git a/src/glx/x11/glxcmds.c b/src/glx/x11/glxcmds.c
index ddb006193c2..2110b2cd86d 100644
--- a/src/glx/x11/glxcmds.c
+++ b/src/glx/x11/glxcmds.c
@@ -39,22 +39,17 @@
  * Client-side GLX interface.
  */
 
-#include <inttypes.h>
 #include "glxclient.h"
-#include <X11/extensions/extutil.h>
-#include <X11/extensions/Xext.h>
-#include <assert.h>
-#include <string.h>
 #include "glapi.h"
-#ifdef GLX_DIRECT_RENDERING
-#include "indirect_init.h"
-#include <X11/extensions/xf86vmode.h>
-#include "xf86dri.h"
-#endif
 #include "glxextensions.h"
 #include "glcontextmodes.h"
 #include "glheader.h"
+
+#ifdef GLX_DIRECT_RENDERING
 #include <sys/time.h>
+#include <X11/extensions/xf86vmode.h>
+#include "xf86dri.h"
+#endif
 
 static const char __glXGLXClientVendorName[] = "SGI";
 static const char __glXGLXClientVersion[] = "1.4";
diff --git a/src/glx/x11/glxcurrent.c b/src/glx/x11/glxcurrent.c
new file mode 100644
index 00000000000..ad648fd4380
--- /dev/null
+++ b/src/glx/x11/glxcurrent.c
@@ -0,0 +1,510 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+** 
+** http://oss.sgi.com/projects/FreeB
+** 
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+** 
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+** 
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+**
+*/
+
+/**
+ * \file glxcurrent.c
+ * Client-side GLX interface for current context management.
+ */
+
+#include "glxclient.h"
+#include "glapi.h"
+#include "glheader.h"
+#include "indirect_init.h"
+
+#ifdef GLX_DIRECT_RENDERING
+#include "xf86dri.h"
+#endif
+
+/*
+** We setup some dummy structures here so that the API can be used
+** even if no context is current.
+*/
+
+static GLubyte dummyBuffer[__GLX_BUFFER_LIMIT_SIZE];
+
+/*
+** Dummy context used by small commands when there is no current context.
+** All the
+** gl and glx entry points are designed to operate as nop's when using
+** the dummy context structure.
+*/
+static __GLXcontext dummyContext = {
+    &dummyBuffer[0],
+    &dummyBuffer[0],
+    &dummyBuffer[0],
+    &dummyBuffer[__GLX_BUFFER_LIMIT_SIZE],
+    sizeof(dummyBuffer),
+};
+
+
+/*
+** All indirect rendering contexts will share the same indirect dispatch table.
+*/
+static __GLapi *IndirectAPI = NULL;
+
+
+/*
+ * Current context management and locking
+ */
+
+#if defined( USE_XTHREADS )
+
+/* thread safe */
+static GLboolean TSDinitialized = GL_FALSE;
+static xthread_key_t ContextTSD;
+
+_X_HIDDEN __GLXcontext *__glXGetCurrentContext(void)
+{
+   if (!TSDinitialized) {
+      xthread_key_create(&ContextTSD, NULL);
+      TSDinitialized = GL_TRUE;
+      return &dummyContext;
+   }
+   else {
+      void *p;
+      xthread_get_specific(ContextTSD, &p);
+      if (!p)
+         return &dummyContext;
+      else
+         return (__GLXcontext *) p;
+   }
+}
+
+_X_HIDDEN void __glXSetCurrentContext(__GLXcontext *c)
+{
+   if (!TSDinitialized) {
+      xthread_key_create(&ContextTSD, NULL);
+      TSDinitialized = GL_TRUE;
+   }
+   xthread_set_specific(ContextTSD, c);
+}
+
+
+/* Used by the __glXLock() and __glXUnlock() macros */
+_X_HIDDEN xmutex_rec __glXmutex;
+
+#elif defined( PTHREADS )
+
+_X_HIDDEN pthread_mutex_t __glXmutex = PTHREAD_MUTEX_INITIALIZER;
+
+# if defined( GLX_USE_TLS )
+
+/**
+ * Per-thread GLX context pointer.
+ * 
+ * \c __glXSetCurrentContext is written is such a way that this pointer can
+ * \b never be \c NULL.  This is important!  Because of this
+ * \c __glXGetCurrentContext can be implemented as trivial macro.
+ */
+__thread void * __glX_tls_Context __attribute__((tls_model("initial-exec")))
+    = &dummyContext;
+
+_X_HIDDEN void __glXSetCurrentContext( __GLXcontext * c )
+{
+    __glX_tls_Context = (c != NULL) ? c : &dummyContext;
+}
+
+# else
+
+static pthread_once_t once_control = PTHREAD_ONCE_INIT;
+
+/**
+ * Per-thread data key.
+ * 
+ * Once \c init_thread_data has been called, the per-thread data key will
+ * take a value of \c NULL.  As each new thread is created the default
+ * value, in that thread, will be \c NULL.
+ */
+static pthread_key_t ContextTSD;
+
+/**
+ * Initialize the per-thread data key.
+ * 
+ * This function is called \b exactly once per-process (not per-thread!) to
+ * initialize the per-thread data key.  This is ideally done using the
+ * \c pthread_once mechanism.
+ */
+static void init_thread_data( void )
+{
+    if ( pthread_key_create( & ContextTSD, NULL ) != 0 ) {
+	perror( "pthread_key_create" );
+	exit( -1 );
+    }
+}
+
+_X_HIDDEN void __glXSetCurrentContext( __GLXcontext * c )
+{
+    pthread_once( & once_control, init_thread_data );
+    pthread_setspecific( ContextTSD, c );
+}
+
+_X_HIDDEN __GLXcontext * __glXGetCurrentContext( void )
+{
+    void * v;
+
+    pthread_once( & once_control, init_thread_data );
+
+    v = pthread_getspecific( ContextTSD );
+    return (v == NULL) ? & dummyContext : (__GLXcontext *) v;
+}
+
+# endif /* defined( GLX_USE_TLS ) */
+
+#elif defined( THREADS )
+
+#error Unknown threading method specified.
+
+#else
+
+/* not thread safe */
+_X_HIDDEN __GLXcontext *__glXcurrentContext = &dummyContext;
+
+#endif
+
+
+_X_HIDDEN void __glXSetCurrentContextNull(void)
+{
+    __glXSetCurrentContext(&dummyContext);
+#ifdef GLX_DIRECT_RENDERING
+    _glapi_set_dispatch(NULL);  /* no-op functions */
+#endif
+}
+
+
+/************************************************************************/
+
+PUBLIC GLXContext glXGetCurrentContext(void)
+{
+    GLXContext cx = __glXGetCurrentContext();
+    
+    if (cx == &dummyContext) {
+	return NULL;
+    } else {
+	return cx;
+    }
+}
+
+PUBLIC GLXDrawable glXGetCurrentDrawable(void)
+{
+    GLXContext gc = __glXGetCurrentContext();
+    return gc->currentDrawable;
+}
+
+
+/************************************************************************/
+
+/**
+ * Sends a GLX protocol message to the specified display to make the context
+ * and the drawables current.
+ *
+ * \param dpy     Display to send the message to.
+ * \param opcode  Major opcode value for the display.
+ * \param gc_id   Context tag for the context to be made current.
+ * \param draw    Drawable ID for the "draw" drawable.
+ * \param read    Drawable ID for the "read" drawable.
+ * \param reply   Space to store the X-server's reply.
+ *
+ * \warning
+ * This function assumes that \c dpy is locked with \c LockDisplay on entry.
+ */
+static Bool SendMakeCurrentRequest(Display *dpy, CARD8 opcode,
+				   GLXContextID gc_id, GLXContextTag gc_tag,
+				   GLXDrawable draw, GLXDrawable read,
+				   xGLXMakeCurrentReply *reply)
+{
+    Bool ret;
+
+
+    LockDisplay(dpy);
+
+    if (draw == read) {
+	xGLXMakeCurrentReq *req;
+
+	GetReq(GLXMakeCurrent,req);
+	req->reqType = opcode;
+	req->glxCode = X_GLXMakeCurrent;
+	req->drawable = draw;
+	req->context = gc_id;
+	req->oldContextTag = gc_tag;
+    }
+    else {
+	__GLXdisplayPrivate *priv = __glXInitialize(dpy);
+
+	/* If the server can support the GLX 1.3 version, we should
+	 * perfer that.  Not only that, some servers support GLX 1.3 but
+	 * not the SGI extension.
+	 */
+
+	if ((priv->majorVersion > 1) || (priv->minorVersion >= 3)) {
+	    xGLXMakeContextCurrentReq *req;
+
+	    GetReq(GLXMakeContextCurrent,req);
+	    req->reqType = opcode;
+	    req->glxCode = X_GLXMakeContextCurrent;
+	    req->drawable = draw;
+	    req->readdrawable = read;
+	    req->context = gc_id;
+	    req->oldContextTag = gc_tag;
+	}
+	else {
+	    xGLXVendorPrivateWithReplyReq *vpreq;
+	    xGLXMakeCurrentReadSGIReq *req;
+
+	    GetReqExtra(GLXVendorPrivateWithReply,
+			sz_xGLXMakeCurrentReadSGIReq-sz_xGLXVendorPrivateWithReplyReq,vpreq);
+	    req = (xGLXMakeCurrentReadSGIReq *)vpreq;
+	    req->reqType = opcode;
+	    req->glxCode = X_GLXVendorPrivateWithReply;
+	    req->vendorCode = X_GLXvop_MakeCurrentReadSGI;
+	    req->drawable = draw;
+	    req->readable = read;
+	    req->context = gc_id;
+	    req->oldContextTag = gc_tag;
+	}
+    }
+
+    ret = _XReply(dpy, (xReply*) reply, 0, False);
+
+    UnlockDisplay(dpy);
+    SyncHandle();
+
+    return ret;
+}
+
+
+#ifdef GLX_DIRECT_RENDERING
+static __GLXDRIdrawable *
+FetchDRIDrawable(Display *dpy,
+		 GLXDrawable glxDrawable, GLXContext gc, Bool pre13)
+{
+    __GLXdisplayPrivate * const priv = __glXInitialize(dpy);
+    __GLXDRIdrawable *pdraw;
+    __GLXscreenConfigs *psc;
+    XID drawable;
+
+    if (priv == NULL)
+	return NULL;
+    
+    psc = &priv->screenConfigs[gc->screen];
+    if (psc->drawHash == NULL)
+	return NULL;
+
+    if (__glxHashLookup(psc->drawHash, glxDrawable, (void *) &pdraw) == 0)
+	return pdraw;
+
+    /* If this is glXMakeCurrent (pre GLX 1.3) we allow creating the
+     * GLX drawable on the fly.  Otherwise we pass None as the X
+     * drawable */
+    if (pre13)
+	drawable = glxDrawable;
+    else
+	drawable = None;
+
+    pdraw = psc->driScreen->createDrawable(psc, drawable,
+					   glxDrawable, gc->mode);
+    if (__glxHashInsert(psc->drawHash, glxDrawable, pdraw)) {
+	(*pdraw->destroyDrawable)(pdraw);
+	return NULL;
+    }
+
+    return pdraw;
+}
+#endif /* GLX_DIRECT_RENDERING */
+
+
+/**
+ * Make a particular context current.
+ * 
+ * \note This is in this file so that it can access dummyContext.
+ */
+static Bool MakeContextCurrent(Display *dpy, GLXDrawable draw,
+			       GLXDrawable read, GLXContext gc,
+			       Bool pre13)
+{
+    xGLXMakeCurrentReply reply;
+    const GLXContext oldGC = __glXGetCurrentContext();
+    const CARD8 opcode = __glXSetupForCommand(dpy);
+    const CARD8 oldOpcode = ((gc == oldGC) || (oldGC == &dummyContext))
+      ? opcode : __glXSetupForCommand(oldGC->currentDpy);
+    Bool bindReturnValue;
+
+
+    if (!opcode || !oldOpcode) {
+	return GL_FALSE;
+    }
+
+    /* Make sure that the new context has a nonzero ID.  In the request,
+     * a zero context ID is used only to mean that we bind to no current
+     * context.
+     */
+    if ((gc != NULL) && (gc->xid == None)) {
+	return GL_FALSE;
+    }
+
+    _glapi_check_multithread();
+
+#ifdef GLX_DIRECT_RENDERING
+    /* Bind the direct rendering context to the drawable */
+    if (gc && gc->driContext) {
+	__GLXDRIdrawable *pdraw = FetchDRIDrawable(dpy, draw, gc, pre13);
+	__GLXDRIdrawable *pread = FetchDRIDrawable(dpy, read, gc, pre13);
+
+	bindReturnValue =
+	    (gc->driContext->bindContext) (gc->driContext, pdraw, pread);
+    } else
+#endif
+    {
+	/* Send a glXMakeCurrent request to bind the new context. */
+	bindReturnValue = 
+	  SendMakeCurrentRequest(dpy, opcode, gc ? gc->xid : None,
+				 ((dpy != oldGC->currentDpy) || oldGC->isDirect)
+				 ? None : oldGC->currentContextTag,
+				 draw, read, &reply);
+    }
+
+
+    if (!bindReturnValue) {
+	return False;
+    }
+
+    if ((dpy != oldGC->currentDpy || (gc && gc->driContext)) &&
+	!oldGC->isDirect && oldGC != &dummyContext) {
+	xGLXMakeCurrentReply dummy_reply;
+
+	/* We are either switching from one dpy to another and have to
+	 * send a request to the previous dpy to unbind the previous
+	 * context, or we are switching away from a indirect context to
+	 * a direct context and have to send a request to the dpy to
+	 * unbind the previous context.
+	 */
+	(void) SendMakeCurrentRequest(oldGC->currentDpy, oldOpcode, None,
+				      oldGC->currentContextTag, None, None,
+				      & dummy_reply);
+    }
+#ifdef GLX_DIRECT_RENDERING
+    else if (oldGC->driContext) {
+	oldGC->driContext->unbindContext(oldGC->driContext);
+    }
+#endif
+
+
+    /* Update our notion of what is current */
+    __glXLock();
+    if (gc == oldGC) {
+	/* Even though the contexts are the same the drawable might have
+	 * changed.  Note that gc cannot be the dummy, and that oldGC
+	 * cannot be NULL, therefore if they are the same, gc is not
+	 * NULL and not the dummy.
+	 */
+	gc->currentDrawable = draw;
+	gc->currentReadable = read;
+    } else {
+	if (oldGC != &dummyContext) {
+	    /* Old current context is no longer current to anybody */
+	    oldGC->currentDpy = 0;
+	    oldGC->currentDrawable = None;
+	    oldGC->currentReadable = None;
+	    oldGC->currentContextTag = 0;
+
+	    if (oldGC->xid == None) {
+		/* We are switching away from a context that was
+		 * previously destroyed, so we need to free the memory
+		 * for the old handle.
+		 */
+#ifdef GLX_DIRECT_RENDERING
+		/* Destroy the old direct rendering context */
+		if (oldGC->driContext) {
+		    oldGC->driContext->destroyContext(oldGC->driContext,
+						      oldGC->psc,
+						      oldGC->createDpy);
+		    oldGC->driContext = NULL;
+		}
+#endif
+		__glXFreeContext(oldGC);
+	    }
+	}
+	if (gc) {
+	    __glXSetCurrentContext(gc);
+
+	    gc->currentDpy = dpy;
+	    gc->currentDrawable = draw;
+	    gc->currentReadable = read;
+
+            if (!gc->driContext) {
+               if (!IndirectAPI)
+                  IndirectAPI = __glXNewIndirectAPI();
+               _glapi_set_dispatch(IndirectAPI);
+
+#ifdef GLX_USE_APPLEGL
+               do {
+                   extern void XAppleDRIUseIndirectDispatch(void);
+                   XAppleDRIUseIndirectDispatch();
+               } while (0);
+#endif
+
+		__GLXattribute *state = 
+		  (__GLXattribute *)(gc->client_state_private);
+
+		gc->currentContextTag = reply.contextTag;
+		if (state->array_state == NULL) {
+		    (void) glGetString(GL_EXTENSIONS);
+		    (void) glGetString(GL_VERSION);
+		    __glXInitVertexArrayState(gc);
+		}
+	    }
+	    else {
+		gc->currentContextTag = -1;
+	    }
+	} else {
+	    __glXSetCurrentContextNull();
+	}
+    }
+    __glXUnlock();
+    return GL_TRUE;
+}
+
+
+PUBLIC Bool glXMakeCurrent(Display *dpy, GLXDrawable draw, GLXContext gc)
+{
+    return MakeContextCurrent(dpy, draw, draw, gc, True);
+}
+
+PUBLIC GLX_ALIAS(Bool, glXMakeCurrentReadSGI,
+	  (Display *dpy, GLXDrawable d, GLXDrawable r, GLXContext ctx),
+	  (dpy, d, r, ctx, False), MakeContextCurrent)
+
+PUBLIC GLX_ALIAS(Bool, glXMakeContextCurrent,
+	  (Display *dpy, GLXDrawable d, GLXDrawable r, GLXContext ctx),
+	  (dpy, d, r, ctx, False), MakeContextCurrent)
diff --git a/src/glx/x11/glxext.c b/src/glx/x11/glxext.c
index cd5c3196e36..75b7374a3fb 100644
--- a/src/glx/x11/glxext.c
+++ b/src/glx/x11/glxext.c
@@ -45,26 +45,13 @@
  */     
 
 #include "glxclient.h"
-#include <stdio.h>
 #include <X11/extensions/Xext.h>
 #include <X11/extensions/extutil.h>
-#include <X11/extensions/Xfixes.h>
-#include <X11/extensions/Xdamage.h>
-#include <assert.h>
-#include "indirect_init.h"
 #include "glapi.h"
 #include "glxextensions.h"
 #include "glcontextmodes.h"
 #include "glheader.h"
 
-#ifdef GLX_DIRECT_RENDERING
-#include <inttypes.h>
-#include <sys/mman.h>
-#include "xf86dri.h"
-#include "xf86drm.h"
-#include "sarea.h"
-#endif
-
 #ifdef USE_XCB
 #include <X11/Xlib-xcb.h>
 #include <xcb/xcb.h>
@@ -77,24 +64,6 @@ void __glXDumpDrawBuffer(__GLXcontext *ctx);
 #endif
 
 #ifdef USE_SPARC_ASM
-/*
- * This is where our dispatch table's bounds are.
- * And the static mesa_init is taken directly from
- * Mesa's 'sparc.c' initializer.
- *
- * We need something like this here, because this version
- * of openGL/glx never initializes a Mesa context, and so
- * the address of the dispatch table pointer never gets stuffed
- * into the dispatch jump table otherwise.
- *
- * It matters only on SPARC, and only if you are using assembler
- * code instead of C-code indirect dispatch.
- *
- * -- FEM, 04.xii.03
- */
-extern unsigned int _mesa_sparc_glapi_begin;
-extern unsigned int _mesa_sparc_glapi_end;
-extern void __glapi_sparc_icache_flush(unsigned int *);
 static void _glx_mesa_init_sparc_glapi_relocs(void);
 static int _mesa_sparc_needs_init = 1;
 #define INIT_MESA_SPARC { \
@@ -108,153 +77,6 @@ static int _mesa_sparc_needs_init = 1;
 #endif
 
 /*
-** We setup some dummy structures here so that the API can be used
-** even if no context is current.
-*/
-
-static GLubyte dummyBuffer[__GLX_BUFFER_LIMIT_SIZE];
-
-/*
-** Dummy context used by small commands when there is no current context.
-** All the
-** gl and glx entry points are designed to operate as nop's when using
-** the dummy context structure.
-*/
-static __GLXcontext dummyContext = {
-    &dummyBuffer[0],
-    &dummyBuffer[0],
-    &dummyBuffer[0],
-    &dummyBuffer[__GLX_BUFFER_LIMIT_SIZE],
-    sizeof(dummyBuffer),
-};
-
-
-/*
-** All indirect rendering contexts will share the same indirect dispatch table.
-*/
-static __GLapi *IndirectAPI = NULL;
-
-
-/*
- * Current context management and locking
- */
-
-#if defined( USE_XTHREADS )
-
-/* thread safe */
-static GLboolean TSDinitialized = GL_FALSE;
-static xthread_key_t ContextTSD;
-
-_X_HIDDEN __GLXcontext *__glXGetCurrentContext(void)
-{
-   if (!TSDinitialized) {
-      xthread_key_create(&ContextTSD, NULL);
-      TSDinitialized = GL_TRUE;
-      return &dummyContext;
-   }
-   else {
-      void *p;
-      xthread_get_specific(ContextTSD, &p);
-      if (!p)
-         return &dummyContext;
-      else
-         return (__GLXcontext *) p;
-   }
-}
-
-_X_HIDDEN void __glXSetCurrentContext(__GLXcontext *c)
-{
-   if (!TSDinitialized) {
-      xthread_key_create(&ContextTSD, NULL);
-      TSDinitialized = GL_TRUE;
-   }
-   xthread_set_specific(ContextTSD, c);
-}
-
-
-/* Used by the __glXLock() and __glXUnlock() macros */
-_X_HIDDEN xmutex_rec __glXmutex;
-
-#elif defined( PTHREADS )
-
-_X_HIDDEN pthread_mutex_t __glXmutex = PTHREAD_MUTEX_INITIALIZER;
-
-# if defined( GLX_USE_TLS )
-
-/**
- * Per-thread GLX context pointer.
- * 
- * \c __glXSetCurrentContext is written is such a way that this pointer can
- * \b never be \c NULL.  This is important!  Because of this
- * \c __glXGetCurrentContext can be implemented as trivial macro.
- */
-__thread void * __glX_tls_Context __attribute__((tls_model("initial-exec")))
-    = &dummyContext;
-
-_X_HIDDEN void __glXSetCurrentContext( __GLXcontext * c )
-{
-    __glX_tls_Context = (c != NULL) ? c : &dummyContext;
-}
-
-# else
-
-static pthread_once_t once_control = PTHREAD_ONCE_INIT;
-
-/**
- * Per-thread data key.
- * 
- * Once \c init_thread_data has been called, the per-thread data key will
- * take a value of \c NULL.  As each new thread is created the default
- * value, in that thread, will be \c NULL.
- */
-static pthread_key_t ContextTSD;
-
-/**
- * Initialize the per-thread data key.
- * 
- * This function is called \b exactly once per-process (not per-thread!) to
- * initialize the per-thread data key.  This is ideally done using the
- * \c pthread_once mechanism.
- */
-static void init_thread_data( void )
-{
-    if ( pthread_key_create( & ContextTSD, NULL ) != 0 ) {
-	perror( "pthread_key_create" );
-	exit( -1 );
-    }
-}
-
-_X_HIDDEN void __glXSetCurrentContext( __GLXcontext * c )
-{
-    pthread_once( & once_control, init_thread_data );
-    pthread_setspecific( ContextTSD, c );
-}
-
-_X_HIDDEN __GLXcontext * __glXGetCurrentContext( void )
-{
-    void * v;
-
-    pthread_once( & once_control, init_thread_data );
-
-    v = pthread_getspecific( ContextTSD );
-    return (v == NULL) ? & dummyContext : (__GLXcontext *) v;
-}
-
-# endif /* defined( GLX_USE_TLS ) */
-
-#elif defined( THREADS )
-
-#error Unknown threading method specified.
-
-#else
-
-/* not thread safe */
-_X_HIDDEN __GLXcontext *__glXcurrentContext = &dummyContext;
-
-#endif
-
-
-/*
 ** You can set this cell to 1 to force the gl drawing stuff to be
 ** one command per packet
 */
@@ -287,10 +109,7 @@ static int __glXCloseDisplay(Display *dpy, XExtCodes *codes)
 
   gc = __glXGetCurrentContext();
   if (dpy == gc->currentDpy) {
-    __glXSetCurrentContext(&dummyContext);
-#ifdef GLX_DIRECT_RENDERING
-    _glapi_set_dispatch(NULL);  /* no-op functions */
-#endif
+    __glXSetCurrentContextNull();
     __glXFreeContext(gc);
   }
 
@@ -1086,318 +905,6 @@ _X_HIDDEN void __glXSendLargeCommand(__GLXcontext *ctx,
 
 /************************************************************************/
 
-PUBLIC GLXContext glXGetCurrentContext(void)
-{
-    GLXContext cx = __glXGetCurrentContext();
-    
-    if (cx == &dummyContext) {
-	return NULL;
-    } else {
-	return cx;
-    }
-}
-
-PUBLIC GLXDrawable glXGetCurrentDrawable(void)
-{
-    GLXContext gc = __glXGetCurrentContext();
-    return gc->currentDrawable;
-}
-
-
-/************************************************************************/
-
-static Bool SendMakeCurrentRequest( Display *dpy, CARD8 opcode,
-    GLXContextID gc, GLXContextTag old_gc, GLXDrawable draw, GLXDrawable read,
-    xGLXMakeCurrentReply * reply );
-
-/**
- * Sends a GLX protocol message to the specified display to make the context
- * and the drawables current.
- *
- * \param dpy     Display to send the message to.
- * \param opcode  Major opcode value for the display.
- * \param gc_id   Context tag for the context to be made current.
- * \param draw    Drawable ID for the "draw" drawable.
- * \param read    Drawable ID for the "read" drawable.
- * \param reply   Space to store the X-server's reply.
- *
- * \warning
- * This function assumes that \c dpy is locked with \c LockDisplay on entry.
- */
-static Bool SendMakeCurrentRequest(Display *dpy, CARD8 opcode,
-				   GLXContextID gc_id, GLXContextTag gc_tag,
-				   GLXDrawable draw, GLXDrawable read,
-				   xGLXMakeCurrentReply *reply)
-{
-    Bool ret;
-
-
-    LockDisplay(dpy);
-
-    if (draw == read) {
-	xGLXMakeCurrentReq *req;
-
-	GetReq(GLXMakeCurrent,req);
-	req->reqType = opcode;
-	req->glxCode = X_GLXMakeCurrent;
-	req->drawable = draw;
-	req->context = gc_id;
-	req->oldContextTag = gc_tag;
-    }
-    else {
-	__GLXdisplayPrivate *priv = __glXInitialize(dpy);
-
-	/* If the server can support the GLX 1.3 version, we should
-	 * perfer that.  Not only that, some servers support GLX 1.3 but
-	 * not the SGI extension.
-	 */
-
-	if ((priv->majorVersion > 1) || (priv->minorVersion >= 3)) {
-	    xGLXMakeContextCurrentReq *req;
-
-	    GetReq(GLXMakeContextCurrent,req);
-	    req->reqType = opcode;
-	    req->glxCode = X_GLXMakeContextCurrent;
-	    req->drawable = draw;
-	    req->readdrawable = read;
-	    req->context = gc_id;
-	    req->oldContextTag = gc_tag;
-	}
-	else {
-	    xGLXVendorPrivateWithReplyReq *vpreq;
-	    xGLXMakeCurrentReadSGIReq *req;
-
-	    GetReqExtra(GLXVendorPrivateWithReply,
-			sz_xGLXMakeCurrentReadSGIReq-sz_xGLXVendorPrivateWithReplyReq,vpreq);
-	    req = (xGLXMakeCurrentReadSGIReq *)vpreq;
-	    req->reqType = opcode;
-	    req->glxCode = X_GLXVendorPrivateWithReply;
-	    req->vendorCode = X_GLXvop_MakeCurrentReadSGI;
-	    req->drawable = draw;
-	    req->readable = read;
-	    req->context = gc_id;
-	    req->oldContextTag = gc_tag;
-	}
-    }
-
-    ret = _XReply(dpy, (xReply*) reply, 0, False);
-
-    UnlockDisplay(dpy);
-    SyncHandle();
-
-    return ret;
-}
-
-
-#ifdef GLX_DIRECT_RENDERING
-static __GLXDRIdrawable *
-FetchDRIDrawable(Display *dpy,
-		 GLXDrawable glxDrawable, GLXContext gc, Bool pre13)
-{
-    __GLXdisplayPrivate * const priv = __glXInitialize(dpy);
-    __GLXDRIdrawable *pdraw;
-    __GLXscreenConfigs *psc;
-    XID drawable;
-
-    if (priv == NULL)
-	return NULL;
-    
-    psc = &priv->screenConfigs[gc->screen];
-    if (psc->drawHash == NULL)
-	return NULL;
-
-    if (__glxHashLookup(psc->drawHash, glxDrawable, (void *) &pdraw) == 0)
-	return pdraw;
-
-    /* If this is glXMakeCurrent (pre GLX 1.3) we allow creating the
-     * GLX drawable on the fly.  Otherwise we pass None as the X
-     * drawable */
-    if (pre13)
-	drawable = glxDrawable;
-    else
-	drawable = None;
-
-    pdraw = psc->driScreen->createDrawable(psc, drawable,
-					   glxDrawable, gc->mode);
-    if (__glxHashInsert(psc->drawHash, glxDrawable, pdraw)) {
-	(*pdraw->destroyDrawable)(pdraw);
-	return NULL;
-    }
-
-    return pdraw;
-}
-#endif /* GLX_DIRECT_RENDERING */
-
-
-/**
- * Make a particular context current.
- * 
- * \note This is in this file so that it can access dummyContext.
- */
-static Bool MakeContextCurrent(Display *dpy, GLXDrawable draw,
-			       GLXDrawable read, GLXContext gc,
-			       Bool pre13)
-{
-    xGLXMakeCurrentReply reply;
-    const GLXContext oldGC = __glXGetCurrentContext();
-    const CARD8 opcode = __glXSetupForCommand(dpy);
-    const CARD8 oldOpcode = ((gc == oldGC) || (oldGC == &dummyContext))
-      ? opcode : __glXSetupForCommand(oldGC->currentDpy);
-    Bool bindReturnValue;
-
-
-    if (!opcode || !oldOpcode) {
-	return GL_FALSE;
-    }
-
-    /* Make sure that the new context has a nonzero ID.  In the request,
-     * a zero context ID is used only to mean that we bind to no current
-     * context.
-     */
-    if ((gc != NULL) && (gc->xid == None)) {
-	return GL_FALSE;
-    }
-
-    _glapi_check_multithread();
-
-#ifdef GLX_DIRECT_RENDERING
-    /* Bind the direct rendering context to the drawable */
-    if (gc && gc->driContext) {
-	__GLXDRIdrawable *pdraw = FetchDRIDrawable(dpy, draw, gc, pre13);
-	__GLXDRIdrawable *pread = FetchDRIDrawable(dpy, read, gc, pre13);
-
-	bindReturnValue =
-	    (gc->driContext->bindContext) (gc->driContext, pdraw, pread);
-    } else
-#endif
-    {
-	/* Send a glXMakeCurrent request to bind the new context. */
-	bindReturnValue = 
-	  SendMakeCurrentRequest(dpy, opcode, gc ? gc->xid : None,
-				 ((dpy != oldGC->currentDpy) || oldGC->isDirect)
-				 ? None : oldGC->currentContextTag,
-				 draw, read, &reply);
-    }
-
-
-    if (!bindReturnValue) {
-	return False;
-    }
-
-    if ((dpy != oldGC->currentDpy || (gc && gc->driContext)) &&
-	!oldGC->isDirect && oldGC != &dummyContext) {
-	xGLXMakeCurrentReply dummy_reply;
-
-	/* We are either switching from one dpy to another and have to
-	 * send a request to the previous dpy to unbind the previous
-	 * context, or we are switching away from a indirect context to
-	 * a direct context and have to send a request to the dpy to
-	 * unbind the previous context.
-	 */
-	(void) SendMakeCurrentRequest(oldGC->currentDpy, oldOpcode, None,
-				      oldGC->currentContextTag, None, None,
-				      & dummy_reply);
-    }
-#ifdef GLX_DIRECT_RENDERING
-    else if (oldGC->driContext) {
-	oldGC->driContext->unbindContext(oldGC->driContext);
-    }
-#endif
-
-
-    /* Update our notion of what is current */
-    __glXLock();
-    if (gc == oldGC) {
-	/* Even though the contexts are the same the drawable might have
-	 * changed.  Note that gc cannot be the dummy, and that oldGC
-	 * cannot be NULL, therefore if they are the same, gc is not
-	 * NULL and not the dummy.
-	 */
-	gc->currentDrawable = draw;
-	gc->currentReadable = read;
-    } else {
-	if (oldGC != &dummyContext) {
-	    /* Old current context is no longer current to anybody */
-	    oldGC->currentDpy = 0;
-	    oldGC->currentDrawable = None;
-	    oldGC->currentReadable = None;
-	    oldGC->currentContextTag = 0;
-
-	    if (oldGC->xid == None) {
-		/* We are switching away from a context that was
-		 * previously destroyed, so we need to free the memory
-		 * for the old handle.
-		 */
-#ifdef GLX_DIRECT_RENDERING
-		/* Destroy the old direct rendering context */
-		if (oldGC->driContext) {
-		    oldGC->driContext->destroyContext(oldGC->driContext,
-						      oldGC->psc,
-						      oldGC->createDpy);
-		    oldGC->driContext = NULL;
-		}
-#endif
-		__glXFreeContext(oldGC);
-	    }
-	}
-	if (gc) {
-	    __glXSetCurrentContext(gc);
-
-	    gc->currentDpy = dpy;
-	    gc->currentDrawable = draw;
-	    gc->currentReadable = read;
-
-            if (!gc->driContext) {
-               if (!IndirectAPI)
-                  IndirectAPI = __glXNewIndirectAPI();
-               _glapi_set_dispatch(IndirectAPI);
-
-#ifdef GLX_USE_APPLEGL
-               do {
-                   extern void XAppleDRIUseIndirectDispatch(void);
-                   XAppleDRIUseIndirectDispatch();
-               } while (0);
-#endif
-
-		__GLXattribute *state = 
-		  (__GLXattribute *)(gc->client_state_private);
-
-		gc->currentContextTag = reply.contextTag;
-		if (state->array_state == NULL) {
-		    (void) glGetString(GL_EXTENSIONS);
-		    (void) glGetString(GL_VERSION);
-		    __glXInitVertexArrayState(gc);
-		}
-	    }
-	    else {
-		gc->currentContextTag = -1;
-	    }
-	} else {
-	    __glXSetCurrentContext(&dummyContext);
-#ifdef GLX_DIRECT_RENDERING
-            _glapi_set_dispatch(NULL);  /* no-op functions */
-#endif
-	}
-    }
-    __glXUnlock();
-    return GL_TRUE;
-}
-
-
-PUBLIC Bool glXMakeCurrent(Display *dpy, GLXDrawable draw, GLXContext gc)
-{
-    return MakeContextCurrent(dpy, draw, draw, gc, True);
-}
-
-PUBLIC GLX_ALIAS(Bool, glXMakeCurrentReadSGI,
-	  (Display *dpy, GLXDrawable d, GLXDrawable r, GLXContext ctx),
-	  (dpy, d, r, ctx, False), MakeContextCurrent)
-
-PUBLIC GLX_ALIAS(Bool, glXMakeContextCurrent,
-	  (Display *dpy, GLXDrawable d, GLXDrawable r, GLXContext ctx),
-	  (dpy, d, r, ctx, False), MakeContextCurrent)
-
-
 #ifdef DEBUG
 _X_HIDDEN void __glXDumpDrawBuffer(__GLXcontext *ctx)
 {
@@ -1424,9 +931,23 @@ _X_HIDDEN void __glXDumpDrawBuffer(__GLXcontext *ctx)
 
 #ifdef  USE_SPARC_ASM
 /*
- * Used only when we are sparc, using sparc assembler.
+ * This is where our dispatch table's bounds are.
+ * And the static mesa_init is taken directly from
+ * Mesa's 'sparc.c' initializer.
  *
+ * We need something like this here, because this version
+ * of openGL/glx never initializes a Mesa context, and so
+ * the address of the dispatch table pointer never gets stuffed
+ * into the dispatch jump table otherwise.
+ *
+ * It matters only on SPARC, and only if you are using assembler
+ * code instead of C-code indirect dispatch.
+ *
+ * -- FEM, 04.xii.03
  */
+extern unsigned int _mesa_sparc_glapi_begin;
+extern unsigned int _mesa_sparc_glapi_end;
+extern void __glapi_sparc_icache_flush(unsigned int *);
 
 static void
 _glx_mesa_init_sparc_glapi_relocs(void)