xm_api.c

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

   XMesaColormap cmap;
   int depth;

   assert(v);
   assert(w);

   /* Check that window depth matches visual depth */
#ifdef XFree86Server
   depth = ((XMesaDrawable)w)->depth;
#else
   XGetWindowAttributes( v->display, w, &attr );
   depth = attr.depth;
#endif
   if (GET_VISUAL_DEPTH(v) != depth) {
      _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
                    GET_VISUAL_DEPTH(v), depth);
      return NULL;
   }

   /* Find colormap */
#ifdef XFree86Server
   cmap = (ColormapPtr)LookupIDByType(wColormap(w), RT_COLORMAP);
#else
   if (attr.colormap) {
      cmap = attr.colormap;
   }
   else {
      _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
      /* this is weird, a window w/out a colormap!? */
      /* OK, let's just allocate a new one and hope for the best */
      cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
   }
#endif

   b = create_xmesa_buffer((XMesaDrawable) w, WINDOW, v, cmap);
   if (!b)
      return NULL;

   if (!initialize_visual_and_buffer( v, b, v->mesa_visual.rgbMode,
                                      (XMesaDrawable) w, cmap )) {
      xmesa_free_buffer(b);
      return NULL;
   }

   return b;
}



/**
 * Create a new XMesaBuffer from an X pixmap.
 *
 * \param v    the XMesaVisual
 * \param p    the pixmap
 * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
 *             \c GLX_DIRECT_COLOR visual for the pixmap
 * \returns new XMesaBuffer or NULL if error
 */
PUBLIC XMesaBuffer
XMesaCreatePixmapBuffer(XMesaVisual v, XMesaPixmap p, XMesaColormap cmap)
{
   XMesaBuffer b;

   assert(v);

   b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
   if (!b)
      return NULL;

   if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
				     (XMesaDrawable) p, cmap)) {
      xmesa_free_buffer(b);
      return NULL;
   }

   return b;
}


/**
 * For GLX_EXT_texture_from_pixmap
 */
XMesaBuffer
XMesaCreatePixmapTextureBuffer(XMesaVisual v, XMesaPixmap p,
                               XMesaColormap cmap,
                               int format, int target, int mipmap)
{
   GET_CURRENT_CONTEXT(ctx);
   XMesaBuffer b;
   GLuint width, height;

   assert(v);

   b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
   if (!b)
      return NULL;

   /* get pixmap size, update framebuffer/renderbuffer dims */
   xmesa_get_window_size(v->display, b, &width, &height);
   _mesa_resize_framebuffer(NULL, &(b->mesa_buffer), width, height);

   if (target == 0) {
      /* examine dims */
      if (ctx->Extensions.ARB_texture_non_power_of_two) {
         target = GLX_TEXTURE_2D_EXT;
      }
      else if (   _mesa_bitcount(width)  == 1
               && _mesa_bitcount(height) == 1) {
         /* power of two size */
         if (height == 1) {
            target = GLX_TEXTURE_1D_EXT;
         }
         else {
            target = GLX_TEXTURE_2D_EXT;
         }
      }
      else if (ctx->Extensions.NV_texture_rectangle) {
         target = GLX_TEXTURE_RECTANGLE_EXT;
      }
      else {
         /* non power of two textures not supported */
         XMesaDestroyBuffer(b);
         return 0;
      }
   }

   b->TextureTarget = target;
   b->TextureFormat = format;
   b->TextureMipmap = mipmap;

   if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
				     (XMesaDrawable) p, cmap)) {
      xmesa_free_buffer(b);
      return NULL;
   }

   return b;
}



XMesaBuffer
XMesaCreatePBuffer(XMesaVisual v, XMesaColormap cmap,
                   unsigned int width, unsigned int height)
{
#ifndef XFree86Server
   XMesaWindow root;
   XMesaDrawable drawable;  /* X Pixmap Drawable */
   XMesaBuffer b;

   /* allocate pixmap for front buffer */
   root = RootWindow( v->display, v->visinfo->screen );
   drawable = XCreatePixmap(v->display, root, width, height,
                            v->visinfo->depth);
   if (!drawable)
      return NULL;

   b = create_xmesa_buffer(drawable, PBUFFER, v, cmap);
   if (!b)
      return NULL;

   if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
				     drawable, cmap)) {
      xmesa_free_buffer(b);
      return NULL;
   }

   return b;
#else
   return 0;
#endif
}



/*
 * Deallocate an XMesaBuffer structure and all related info.
 */
PUBLIC void
XMesaDestroyBuffer(XMesaBuffer b)
{
   xmesa_free_buffer(b);
}


/**
 * Query the current window size and update the corresponding GLframebuffer
 * and all attached renderbuffers.
 * Called when:
 *  1. the first time a buffer is bound to a context.
 *  2. from glViewport to poll for window size changes
 *  3. from the XMesaResizeBuffers() API function.
 * Note: it's possible (and legal) for xmctx to be NULL.  That can happen
 * when resizing a buffer when no rendering context is bound.
 */
void
xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer)
{
   GLuint width, height;
   xmesa_get_window_size(drawBuffer->display, drawBuffer, &width, &height);
   if (drawBuffer->mesa_buffer.Width != width ||
       drawBuffer->mesa_buffer.Height != height) {
      GLcontext *ctx = xmctx ? &xmctx->mesa : NULL;
      _mesa_resize_framebuffer(ctx, &(drawBuffer->mesa_buffer), width, height);
   }
   drawBuffer->mesa_buffer.Initialized = GL_TRUE; /* XXX TEMPORARY? */
}


/*
 * Bind buffer b to context c and make c the current rendering context.
 */
GLboolean XMesaMakeCurrent( XMesaContext c, XMesaBuffer b )
{
   return XMesaMakeCurrent2( c, b, b );
}


/*
 * Bind buffer b to context c and make c the current rendering context.
 */
PUBLIC
GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
                             XMesaBuffer readBuffer )
{
   if (c) {
      if (!drawBuffer || !readBuffer)
         return GL_FALSE;  /* must specify buffers! */

      if (&(c->mesa) == _mesa_get_current_context()
          && c->mesa.DrawBuffer == &drawBuffer->mesa_buffer
          && c->mesa.ReadBuffer == &readBuffer->mesa_buffer
          && XMESA_BUFFER(c->mesa.DrawBuffer)->wasCurrent) {
         /* same context and buffer, do nothing */
         return GL_TRUE;
      }

      c->xm_buffer = drawBuffer;

#ifdef FX
      if (FXmakeCurrent( drawBuffer ))
         return GL_TRUE;
#endif

      /* Call this periodically to detect when the user has begun using
       * GL rendering from multiple threads.
       */
      _glapi_check_multithread();

      xmesa_check_and_update_buffer_size(c, drawBuffer);
      if (readBuffer != drawBuffer)
         xmesa_check_and_update_buffer_size(c, readBuffer);

      _mesa_make_current(&(c->mesa),
                         &drawBuffer->mesa_buffer,
                         &readBuffer->mesa_buffer);

      if (c->xm_visual->mesa_visual.rgbMode) {
         /*
          * Must recompute and set these pixel values because colormap
          * can be different for different windows.
          */
         c->clearpixel = xmesa_color_to_pixel( &c->mesa,
                                               c->clearcolor[0],
                                               c->clearcolor[1],
                                               c->clearcolor[2],
                                               c->clearcolor[3],
                                               c->xm_visual->undithered_pf);
         XMesaSetForeground(c->display, drawBuffer->cleargc, c->clearpixel);
      }

      /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
      drawBuffer->wasCurrent = GL_TRUE;
   }
   else {
      /* Detach */
      _mesa_make_current( NULL, NULL, NULL );
   }
   return GL_TRUE;
}


/*
 * Unbind the context c from its buffer.
 */
GLboolean XMesaUnbindContext( XMesaContext c )
{
   /* A no-op for XFree86 integration purposes */
   return GL_TRUE;
}


XMesaContext XMesaGetCurrentContext( void )
{
   GET_CURRENT_CONTEXT(ctx);
   if (ctx) {
      XMesaContext xmesa = XMESA_CONTEXT(ctx);
      return xmesa;
   }
   else {
      return 0;
   }
}


XMesaBuffer XMesaGetCurrentBuffer( void )
{
   GET_CURRENT_CONTEXT(ctx);
   if (ctx) {
      XMesaBuffer xmbuf = XMESA_BUFFER(ctx->DrawBuffer);
      return xmbuf;
   }
   else {
      return 0;
   }
}


/* New in Mesa 3.1 */
XMesaBuffer XMesaGetCurrentReadBuffer( void )
{
   GET_CURRENT_CONTEXT(ctx);
   if (ctx) {
      return XMESA_BUFFER(ctx->ReadBuffer);
   }
   else {
      return 0;
   }
}


#ifdef XFree86Server
PUBLIC
GLboolean XMesaForceCurrent(XMesaContext c)
{
   if (c) {
      _glapi_set_dispatch(c->mesa.CurrentDispatch);

      if (&(c->mesa) != _mesa_get_current_context()) {
	 _mesa_make_current(&c->mesa, c->mesa.DrawBuffer, c->mesa.ReadBuffer);
      }
   }
   else {
      _mesa_make_current(NULL, NULL, NULL);
   }
   return GL_TRUE;
}


PUBLIC
GLboolean XMesaLoseCurrent(XMesaContext c)
{
   (void) c;
   _mesa_make_current(NULL, NULL, NULL);
   return GL_TRUE;
}


PUBLIC
GLboolean XMesaCopyContext( XMesaContext xm_src, XMesaContext xm_dst, GLuint mask )
{
   _mesa_copy_context(&xm_src->mesa, &xm_dst->mesa, mask);
   return GL_TRUE;
}
#endif /* XFree86Server */


#ifndef FX
GLboolean XMesaSetFXmode( GLint mode )
{
   (void) mode;
   return GL_FALSE;
}
#endif



/*
 * Copy the back buffer to the front buffer.  If there's no back buffer
 * this is a no-op.
 */
PUBLIC
void XMesaSwapBuffers( XMesaBuffer b )
{
   GET_CURRENT_CONTEXT(ctx);

   if (!b->backxrb) {
      /* single buffered */
      return;
   }

   /* If we're swapping the buffer associated with the current context
    * we have to flush any pending rendering commands first.
    */
   if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
      _mesa_notifySwapBuffers(ctx);

   if (b->db_mode) {
#ifdef FX
      if (FXswapBuffers(b))
         return;
#endif
      if (b->backxrb->ximage) {
	 /* Copy Ximage (back buf) from client memory to server window */
#if defined(USE_XSHM) && !defined(XFree86Server)
	 if (b->shm) {
            /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
	    XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
			  b->swapgc,
			  b->backxrb->ximage, 0, 0,
			  0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
                          False );
            /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
	 }
	 else
#endif
         {
            /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
            XMesaPutImage( b->xm_visual->display, b