glxapi.c

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

/*
 * Mesa 3-D graphics library
 * Version:  7.1
 * 
 * Copyright (C) 1999-2007  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"),
 * 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 and this permission notice 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
 * BRIAN PAUL 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.
 */


/*
 * This is the GLX API dispatcher.  Calls to the glX* functions are
 * either routed to the real GLX encoders or to Mesa's pseudo-GLX functions.
 * See the glxapi.h file for more details.
 */


#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "main/glheader.h"
#include "glapi/glapi.h"
#include "glxapi.h"


extern struct _glxapi_table *_real_GetGLXDispatchTable(void);
extern struct _glxapi_table *_mesa_GetGLXDispatchTable(void);


struct display_dispatch {
   Display *Dpy;
   struct _glxapi_table *Table;
   struct display_dispatch *Next;
};

static struct display_dispatch *DispatchList = NULL;


/* Display -> Dispatch caching */
static Display *prevDisplay = NULL;
static struct _glxapi_table *prevTable = NULL;


static struct _glxapi_table *
get_dispatch(Display *dpy)
{
   if (!dpy)
      return NULL;

   /* search list of display/dispatch pairs for this display */
   {
      const struct display_dispatch *d = DispatchList;
      while (d) {
         if (d->Dpy == dpy) {
            prevDisplay = dpy;
            prevTable = d->Table;
            return d->Table;  /* done! */
         }
         d = d->Next;
      }
   }

   /* A new display, determine if we should use real GLX
    * or Mesa's pseudo-GLX.
    */
   {
      struct _glxapi_table *t = _mesa_GetGLXDispatchTable();

      if (t) {
         struct display_dispatch *d;
         d = (struct display_dispatch *) malloc(sizeof(struct display_dispatch));
         if (d) {
            d->Dpy = dpy;
            d->Table = t;
            /* insert at head of list */
            d->Next = DispatchList;
            DispatchList = d;
            /* update cache */
            prevDisplay = dpy;
            prevTable = t;
            return t;
         }
      }
   }

   /* If we get here that means we can't use real GLX on this display
    * and the Mesa pseudo-GLX software renderer wasn't compiled in.
    * Or, we ran out of memory!
    */
   return NULL;
}


/* Don't use the GET_DISPATCH defined in glthread.h */
#undef GET_DISPATCH

#define GET_DISPATCH(DPY, TABLE)	\
   if (DPY == prevDisplay) {		\
      TABLE = prevTable;		\
   }					\
   else if (!DPY) {			\
      TABLE = NULL;			\
   }					\
   else {				\
      TABLE = get_dispatch(DPY);	\
   }

   


/**
 * GLX API current context.
 */
#if defined(GLX_USE_TLS)
PUBLIC __thread void * CurrentContext
    __attribute__((tls_model("initial-exec")));
#elif defined(THREADS)
static _glthread_TSD ContextTSD;         /**< Per-thread context pointer */
#else
static GLXContext CurrentContext = 0;
#endif


static void
SetCurrentContext(GLXContext c)
{
#if defined(GLX_USE_TLS)
   CurrentContext = c;
#elif defined(THREADS)
   _glthread_SetTSD(&ContextTSD, c);
#else
   CurrentContext = c;
#endif
}


/*
 * GLX API entrypoints
 */

/*** GLX_VERSION_1_0 ***/

XVisualInfo PUBLIC *
glXChooseVisual(Display *dpy, int screen, int *list)
{
   struct _glxapi_table *t;
   GET_DISPATCH(dpy, t);
   if (!t)
      return NULL;
   return (t->ChooseVisual)(dpy, screen, list);
}


void PUBLIC
glXCopyContext(Display *dpy, GLXContext src, GLXContext dst, unsigned long mask)
{
   struct _glxapi_table *t;
   GET_DISPATCH(dpy, t);
   if (!t)
      return;
   (t->CopyContext)(dpy, src, dst, mask);
}


GLXContext PUBLIC
glXCreateContext(Display *dpy, XVisualInfo *visinfo, GLXContext shareList, Bool direct)
{
   struct _glxapi_table *t;
   GET_DISPATCH(dpy, t);
   if (!t)
      return 0;
   return (t->CreateContext)(dpy, visinfo, shareList, direct);
}


GLXPixmap PUBLIC
glXCreateGLXPixmap(Display *dpy, XVisualInfo *visinfo, Pixmap pixmap)
{
   struct _glxapi_table *t;
   GET_DISPATCH(dpy, t);
   if (!t)
      return 0;
   return (t->CreateGLXPixmap)(dpy, visinfo, pixmap);
}


void PUBLIC
glXDestroyContext(Display *dpy, GLXContext ctx)
{
   struct _glxapi_table *t;
   GET_DISPATCH(dpy, t);
   if (!t)
      return;
   if (glXGetCurrentContext() == ctx)
      SetCurrentContext(NULL);
   (t->DestroyContext)(dpy, ctx);
}


void PUBLIC
glXDestroyGLXPixmap(Display *dpy, GLXPixmap pixmap)
{
   struct _glxapi_table *t;
   GET_DISPATCH(dpy, t);
   if (!t)
      return;
   (t->DestroyGLXPixmap)(dpy, pixmap);
}


int PUBLIC
glXGetConfig(Display *dpy, XVisualInfo *visinfo, int attrib, int *value)
{
   struct _glxapi_table *t;
   GET_DISPATCH(dpy, t);
   if (!t)
      return GLX_NO_EXTENSION;
   return (t->GetConfig)(dpy, visinfo, attrib, value);
}


GLXContext PUBLIC
glXGetCurrentContext(void)
{
#if defined(GLX_USE_TLS)
   return CurrentContext;
#elif defined(THREADS)
   return (GLXContext) _glthread_GetTSD(&ContextTSD);
#else
   return CurrentContext;
#endif
}


GLXDrawable PUBLIC
glXGetCurrentDrawable(void)
{
   __GLXcontext *gc = (__GLXcontext *) glXGetCurrentContext();
   return gc ? gc->currentDrawable : 0;
}


Bool PUBLIC
glXIsDirect(Display *dpy, GLXContext ctx)
{
   struct _glxapi_table *t;
   GET_DISPATCH(dpy, t);
   if (!t)
      return False;
   return (t->IsDirect)(dpy, ctx);
}


Bool PUBLIC
glXMakeCurrent(Display *dpy, GLXDrawable drawable, GLXContext ctx)
{
   Bool b;
   struct _glxapi_table *t;
   GET_DISPATCH(dpy, t);
   if (!t) {
      return False;
   }
   b = (*t->MakeCurrent)(dpy, drawable, ctx);
   if (b) {
      SetCurrentContext(ctx);
   }
   return b;
}


Bool PUBLIC
glXQueryExtension(Display *dpy, int *errorb, int *event)
{
   struct _glxapi_table *t;
   GET_DISPATCH(dpy, t);
   if (!t)
      return False;
   return (t->QueryExtension)(dpy, errorb, event);
}


Bool PUBLIC
glXQueryVersion(Display *dpy, int *maj, int *min)
{
   struct _glxapi_table *t;
   GET_DISPATCH(dpy, t);
   if (!t)
      return False;
   return (t->QueryVersion)(dpy, maj, min);
}


void PUBLIC
glXSwapBuffers(Display *dpy, GLXDrawable drawable)
{
   struct _glxapi_table *t;
   GET_DISPATCH(dpy, t);
   if (!t)
      return;
   (t->SwapBuffers)(dpy, drawable);
}


void PUBLIC
glXUseXFont(Font font, int first, int count, int listBase)
{
   struct _glxapi_table *t;
   Display *dpy = glXGetCurrentDisplay();
   GET_DISPATCH(dpy, t);
   if (!t)
      return;
   (t->UseXFont)(font, first, count, listBase);
}


void PUBLIC
glXWaitGL(void)
{
   struct _glxapi_table *t;
   Display *dpy = glXGetCurrentDisplay();
   GET_DISPATCH(dpy, t);
   if (!t)
      return;
   (t->WaitGL)();
}


void PUBLIC
glXWaitX(void)
{
   struct _glxapi_table *t;
   Display *dpy = glXGetCurrentDisplay();
   GET_DISPATCH(dpy, t);
   if (!t)
      return;
   (t->WaitX)();
}



/*** GLX_VERSION_1_1 ***/

const char PUBLIC *
glXGetClientString(Display *dpy, int name)
{
   struct _glxapi_table *t;
   GET_DISPATCH(dpy, t);
   if (!t)
      return NULL;
   return (t->GetClientString)(dpy, name);
}


const char PUBLIC *
glXQueryExtensionsString(Display *dpy, int screen)
{
   struct _glxapi_table *t;
   GET_DISPATCH(dpy, t);
   if (!t)
      return NULL;
   return (t->QueryExtensionsString)(dpy, screen);
}


const char PUBLIC *
glXQueryServerString(Display *dpy, int screen, int name)
{
   struct _glxapi_table *t;
   GET_DISPATCH(dpy, t);
   if (!t)
      return NULL;
   return (t->QueryServerString)(dpy, screen, name);
}


/*** GLX_VERSION_1_2 ***/

Display PUBLIC *
glXGetCurrentDisplay(void)
{
   /* Same code as in libGL's glxext.c */
   __GLXcontext *gc = (__GLXcontext *) glXGetCurrentContext();
   if (NULL == gc) return NULL;
   return gc->currentDpy;
}



/*** GLX_VERSION_1_3 ***/

GLXFBConfig PUBLIC *
glXChooseFBConfig(Display *dpy, int screen, const int *attribList, int *nitems)
{
   struct _glxapi_table *t;
   GET_DISPATCH(dpy, t);
   if (!t)
      return 0;
   return (t->ChooseFBConfig)(dpy, screen, attribList, nitems);
}


GLXContext PUBLIC
glXCreateNewContext(Display *dpy, GLXFBConfig config, int renderType, GLXContext shareList, Bool direct)
{
   struct _glxapi_table *t;
   GET_DISPATCH(dpy, t);
   if (!t)
      return 0;
   return (t->CreateNewContext)(dpy, config, renderType, shareList, direct);
}


GLXPbuffer PUBLIC
glXCreatePbuffer(Display *dpy, GLXFBConfig config, const int *attribList)
{
   struct _glxapi_table *t;
   GET_DISPATCH(dpy, t);
   if (!t)
      return 0;
   return (t->CreatePbuffer)(dpy, config, attribList);
}


GLXPixmap PUBLIC
glXCreatePixmap(Display *dpy, GLXFBConfig config, Pixmap pixmap, const int *attribList)
{
   struct _glxapi_table *t;
   GET_DISPATCH(dpy, t);
   if (!t)
      return 0;
   return (t->CreatePixmap)(dpy, config, pixmap, attribList);
}


GLXWindow PUBLIC
glXCreateWindow(Display *dpy, GLXFBConfig config, Window win, const int *attribList)
{
   struct _glxapi_table *t;
   GET_DISPATCH(dpy, t);
   if (!t)
      return 0;
   return (t->CreateWindow)(dpy, config, win, attribList);
}


void PUBLIC
glXDestroyPbuffer(Display *dpy, GLXPbuffer pbuf)
{
   struct _glxapi_table *t;
   GET_DISPATCH(dpy, t);
   if (!t)
      return;
   (t->DestroyPbuffer)(dpy, pbuf);
}