Retire miniglx and move the actual glx code up to src/glx

1 files changed, 513 insertions, 0 deletions

diff --git a/src/glx/glxcurrent.c b/src/glx/glxcurrent.c
new file mode 100644
index 0000000000..c28360bdde
--- /dev/null
+++ b/src/glx/glxcurrent.c
@@ -0,0 +1,513 @@
+/*
+ * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
+ * Copyright (C) 1991-2000 Silicon Graphics, Inc. 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"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice including the dates of first publication and
+ * either this permission notice or a reference to
+ * http://oss.sgi.com/projects/FreeB/
+ * shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+ * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Except as contained in this notice, the name of Silicon Graphics, Inc.
+ * shall not be used in advertising or otherwise to promote the sale, use or
+ * other dealings in this Software without prior written authorization from
+ * Silicon Graphics, Inc.
+ */
+
+/**
+ * \file glxcurrent.c
+ * Client-side GLX interface for current context management.
+ */
+
+#include "glxclient.h"
+#include "glapi.h"
+#include "indirect_init.h"
+
+/*
+** 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( 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 */
+   _glapi_set_context(NULL);
+#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)
+{
+   __GLXdisplayPrivate *const priv = __glXInitialize(dpy);
+   __GLXDRIdrawable *pdraw;
+   __GLXscreenConfigs *psc;
+
+   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;
+
+   pdraw = psc->driScreen->createDrawable(psc, glxDrawable,
+                                          glxDrawable, gc->mode);
+   if (__glxHashInsert(psc->drawHash, glxDrawable, pdraw)) {
+      (*pdraw->destroyDrawable) (pdraw);
+      return NULL;
+   }
+
+   return pdraw;
+}
+#endif /* GLX_DIRECT_RENDERING */
+
+static void
+__glXGenerateError(Display * dpy, GLXContext gc, XID resource,
+                   BYTE errorCode, CARD16 minorCode)
+{
+   xError error;
+
+   error.errorCode = errorCode;
+   error.resourceID = resource;
+   error.sequenceNumber = dpy->request;
+   error.type = X_Error;
+   error.majorCode = gc->majorOpcode;
+   error.minorCode = minorCode;
+   _XError(dpy, &error);
+}
+
+/**
+ * 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)
+{
+   xGLXMakeCurrentReply reply;
+   const GLXContext oldGC = __glXGetCurrentContext();
+   const CARD8 opcode = __glXSetupForCommand(dpy);
+   const CARD8 oldOpcode = ((gc == oldGC) || (oldGC == &dummyContext))
+      ? opcode : __glXSetupForCommand(oldGC->currentDpy);
+   Bool bindReturnValue;
+   __GLXattribute *state;
+
+   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;
+   }
+
+   if (gc == NULL && (draw != None || read != None)) {
+      __glXGenerateError(dpy, gc, (draw != None) ? draw : read,
+                         BadMatch, X_GLXMakeContextCurrent);
+      return False;
+   }
+   if (gc != NULL && (draw == None || read == None)) {
+      __glXGenerateError(dpy, gc, None, BadMatch, X_GLXMakeContextCurrent);
+      return False;
+   }
+
+   _glapi_check_multithread();
+
+   if (gc != NULL && gc->thread_id != 0 && gc->thread_id != _glthread_GetID()) {
+      __glXGenerateError(dpy, gc, gc->xid,
+                         BadAccess, X_GLXMakeContextCurrent);
+      return False;
+   }
+
+#ifdef GLX_DIRECT_RENDERING
+   /* Bind the direct rendering context to the drawable */
+   if (gc && gc->driContext) {
+      __GLXDRIdrawable *pdraw = FetchDRIDrawable(dpy, draw, gc);
+      __GLXDRIdrawable *pread = FetchDRIDrawable(dpy, read, gc);
+
+      if ((pdraw == NULL) || (pread == NULL)) {
+         __glXGenerateError(dpy, gc, (pdraw == NULL) ? draw : read,
+                            GLXBadDrawable, X_GLXMakeContextCurrent);
+         return False;
+      }
+
+      bindReturnValue =
+         (gc->driContext->bindContext) (gc->driContext, pdraw, pread);
+   }
+   else if (!gc && oldGC && oldGC->driContext) {
+      bindReturnValue = True;
+   }
+   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;
+   }
+
+#ifdef GLX_DIRECT_RENDERING
+   if ((dpy != oldGC->currentDpy || (gc && gc->driContext)) &&
+       !oldGC->isDirect && oldGC != &dummyContext) {
+#else
+   if ((dpy != oldGC->currentDpy) && oldGC != &dummyContext) {
+#endif
+      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 != gc) {
+      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;
+         oldGC->thread_id = 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;
+         gc->thread_id = _glthread_GetID();
+
+#ifdef GLX_DIRECT_RENDERING
+         if (!gc->driContext) {
+#endif
+            if (!IndirectAPI)
+               IndirectAPI = __glXNewIndirectAPI();
+            _glapi_set_dispatch(IndirectAPI);
+
+            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);
+            }
+#ifdef GLX_DIRECT_RENDERING
+         }
+         else {
+            gc->currentContextTag = -1;
+         }
+#endif
+      }
+      else {
+         __glXSetCurrentContextNull();
+      }
+   }
+   __glXUnlock();
+   return GL_TRUE;
+}
+
+
+PUBLIC Bool
+glXMakeCurrent(Display * dpy, GLXDrawable draw, GLXContext gc)
+{
+   return MakeContextCurrent(dpy, draw, draw, gc);
+}
+
+PUBLIC
+GLX_ALIAS(Bool, glXMakeCurrentReadSGI,
+          (Display * dpy, GLXDrawable d, GLXDrawable r, GLXContext ctx),
+          (dpy, d, r, ctx), MakeContextCurrent)
+
+PUBLIC
+GLX_ALIAS(Bool, glXMakeContextCurrent,
+          (Display * dpy, GLXDrawable d, GLXDrawable r,
+           GLXContext ctx), (dpy, d, r, ctx), MakeContextCurrent)