fakeglx.c

mesa-6.5-minigui源码

   GLint depth_size = 0;
   GLint stencil_size = 0;
   GLint accumRedSize = 0;
   GLint accumGreenSize = 0;
   GLint accumBlueSize = 0;
   GLint accumAlphaSize = 0;
   int level = 0;
   int visual_type = DONT_CARE;
   int trans_type = DONT_CARE;
   int trans_value = DONT_CARE;
   GLint caveat = DONT_CARE;
   XMesaVisual xmvis = NULL;
   int desiredVisualID = -1;
   int numAux = 0;

   parselist = list;

   while (*parselist) {

      switch (*parselist) {
	 case GLX_USE_GL:
            if (fbConfig) {
               /* invalid token */
               return NULL;
            }
            else {
               /* skip */
               parselist++;
            }
	    break;
	 case GLX_BUFFER_SIZE:
	    parselist++;
	    min_ci = *parselist++;
	    break;
	 case GLX_LEVEL:
	    parselist++;
            level = *parselist++;
	    break;
	 case GLX_RGBA:
            if (fbConfig) {
               /* invalid token */
               return NULL;
            }
            else {
               rgb_flag = GL_TRUE;
               parselist++;
            }
	    break;
	 case GLX_DOUBLEBUFFER:
            parselist++;
            if (fbConfig) {
               double_flag = *parselist++;
            }
            else {
               double_flag = GL_TRUE;
            }
	    break;
	 case GLX_STEREO:
            parselist++;
            if (fbConfig) {
               stereo_flag = *parselist++;
            }
            else {
               stereo_flag = GL_TRUE;
            }
            return NULL; /* stereo not supported */
	 case GLX_AUX_BUFFERS:
	    parselist++;
            numAux = *parselist++;
            if (numAux > MAX_AUX_BUFFERS)
               return NULL;
	    break;
	 case GLX_RED_SIZE:
	    parselist++;
	    min_red = *parselist++;
	    break;
	 case GLX_GREEN_SIZE:
	    parselist++;
	    min_green = *parselist++;
	    break;
	 case GLX_BLUE_SIZE:
	    parselist++;
	    min_blue = *parselist++;
	    break;
	 case GLX_ALPHA_SIZE:
	    parselist++;
            {
               GLint size = *parselist++;
               alpha_flag = size ? GL_TRUE : GL_FALSE;
            }
	    break;
	 case GLX_DEPTH_SIZE:
	    parselist++;
	    depth_size = *parselist++;
	    break;
	 case GLX_STENCIL_SIZE:
	    parselist++;
	    stencil_size = *parselist++;
	    break;
	 case GLX_ACCUM_RED_SIZE:
	    parselist++;
            {
               GLint size = *parselist++;
               accumRedSize = MAX2( accumRedSize, size );
            }
            break;
	 case GLX_ACCUM_GREEN_SIZE:
	    parselist++;
            {
               GLint size = *parselist++;
               accumGreenSize = MAX2( accumGreenSize, size );
            }
            break;
	 case GLX_ACCUM_BLUE_SIZE:
	    parselist++;
            {
               GLint size = *parselist++;
               accumBlueSize = MAX2( accumBlueSize, size );
            }
            break;
	 case GLX_ACCUM_ALPHA_SIZE:
	    parselist++;
            {
               GLint size = *parselist++;
               accumAlphaSize = MAX2( accumAlphaSize, size );
            }
	    break;

         /*
          * GLX_EXT_visual_info extension
          */
         case GLX_X_VISUAL_TYPE_EXT:
            parselist++;
            visual_type = *parselist++;
            break;
         case GLX_TRANSPARENT_TYPE_EXT:
            parselist++;
            trans_type = *parselist++;
            break;
         case GLX_TRANSPARENT_INDEX_VALUE_EXT:
            parselist++;
            trans_value = *parselist++;
            break;
         case GLX_TRANSPARENT_RED_VALUE_EXT:
         case GLX_TRANSPARENT_GREEN_VALUE_EXT:
         case GLX_TRANSPARENT_BLUE_VALUE_EXT:
         case GLX_TRANSPARENT_ALPHA_VALUE_EXT:
	    /* ignore */
	    parselist++;
	    parselist++;
	    break;

         /*
          * GLX_EXT_visual_info extension
          */
         case GLX_VISUAL_CAVEAT_EXT:
            parselist++;
            caveat = *parselist++; /* ignored for now */
            break;

         /*
          * GLX_ARB_multisample
          */
         case GLX_SAMPLE_BUFFERS_ARB:
            /* ms not supported */
            return NULL;
         case GLX_SAMPLES_ARB:
            /* ms not supported */
            return NULL;

         /*
          * FBConfig attribs.
          */
         case GLX_RENDER_TYPE:
            if (!fbConfig)
               return NULL;
            parselist++;
            if (*parselist == GLX_RGBA_BIT) {
               rgb_flag = GL_TRUE;
            }
            else if (*parselist == GLX_COLOR_INDEX_BIT) {
               rgb_flag = GL_FALSE;
            }
            else if (*parselist == 0) {
               rgb_flag = GL_TRUE;
            }
            parselist++;
            break;
         case GLX_DRAWABLE_TYPE:
            if (!fbConfig)
               return NULL;
            parselist++;
            if (*parselist & ~(GLX_WINDOW_BIT | GLX_PIXMAP_BIT | GLX_PBUFFER_BIT)) {
               return NULL; /* bad bit */
            }
            parselist++;
            break;
         case GLX_FBCONFIG_ID:
            if (!fbConfig)
               return NULL;
            parselist++;
            desiredVisualID = *parselist++;
            break;
         case GLX_X_RENDERABLE:
            if (!fbConfig)
               return NULL;
            parselist += 2;
            /* ignore */
            break;

	 case None:
            /* end of list */
	    break;

	 default:
	    /* undefined attribute */
            _mesa_warning(NULL, "unexpected attrib 0x%x in choose_visual()",
                          *parselist);
	    return NULL;
      }
   }

   (void) caveat;

   /*
    * Since we're only simulating the GLX extension this function will never
    * find any real GL visuals.  Instead, all we can do is try to find an RGB
    * or CI visual of appropriate depth.  Other requested attributes such as
    * double buffering, depth buffer, etc. will be associated with the X
    * visual and stored in the VisualTable[].
    */
   if (desiredVisualID != -1) {
      /* try to get a specific visual, by visualID */
      XVisualInfo temp;
      int n;
      temp.visualid = desiredVisualID;
      temp.screen = screen;
      vis = XGetVisualInfo(dpy, VisualIDMask | VisualScreenMask, &temp, &n);
      if (vis) {
         /* give the visual some useful GLX attributes */
         double_flag = GL_TRUE;
         if (vis->depth > 8)
            rgb_flag = GL_TRUE;
         depth_size = default_depth_bits();
         stencil_size = STENCIL_BITS;
         /* XXX accum??? */
      }
   }
   else if (level==0) {
      /* normal color planes */
      if (rgb_flag) {
         /* Get an RGB visual */
         int min_rgb = min_red + min_green + min_blue;
         if (min_rgb>1 && min_rgb<8) {
            /* a special case to be sure we can get a monochrome visual */
            min_rgb = 1;
         }
         vis = choose_x_visual( dpy, screen, rgb_flag, min_rgb, visual_type );
      }
      else {
         /* Get a color index visual */
         vis = choose_x_visual( dpy, screen, rgb_flag, min_ci, visual_type );
         accumRedSize = accumGreenSize = accumBlueSize = accumAlphaSize = 0;
      }
   }
   else {
      /* over/underlay planes */
      if (rgb_flag) {
         /* rgba overlay */
         int min_rgb = min_red + min_green + min_blue;
         if (min_rgb>1 && min_rgb<8) {
            /* a special case to be sure we can get a monochrome visual */
            min_rgb = 1;
         }
         vis = choose_x_overlay_visual( dpy, screen, rgb_flag, level,
                              trans_type, trans_value, min_rgb, visual_type );
      }
      else {
         /* color index overlay */
         vis = choose_x_overlay_visual( dpy, screen, rgb_flag, level,
                              trans_type, trans_value, min_ci, visual_type );
      }
   }

   if (vis) {
      /* Note: we're not exactly obeying the glXChooseVisual rules here.
       * When GLX_DEPTH_SIZE = 1 is specified we're supposed to choose the
       * largest depth buffer size, which is 32bits/value.  Instead, we
       * return 16 to maintain performance with earlier versions of Mesa.
       */
      if (depth_size > 24)
         depth_size = 32;
      else if (depth_size > 16)
         depth_size = 24;
      else if (depth_size > 0) {
         depth_size = default_depth_bits();
      }

      if (!alpha_flag) {
         alpha_flag = default_alpha_bits() > 0;
      }

      /* we only support one size of stencil and accum buffers. */
      if (stencil_size > 0)
         stencil_size = STENCIL_BITS;
      if (accumRedSize > 0 || accumGreenSize > 0 || accumBlueSize > 0 ||
          accumAlphaSize > 0) {
         accumRedSize = 
         accumGreenSize = 
         accumBlueSize = default_accum_bits();
         accumAlphaSize = alpha_flag ? accumRedSize : 0;
      }

      xmvis = save_glx_visual( dpy, vis, rgb_flag, alpha_flag, double_flag,
                               stereo_flag, depth_size, stencil_size,
                               accumRedSize, accumGreenSize,
                               accumBlueSize, accumAlphaSize, level, numAux );
   }

   return xmvis;
}


static XVisualInfo *
Fake_glXChooseVisual( Display *dpy, int screen, int *list )
{
   XMesaVisual xmvis = choose_visual(dpy, screen, list, GL_FALSE);
   if (xmvis) {
#if 0
      return xmvis->vishandle;
#else
      /* create a new vishandle - the cached one may be stale */
      xmvis->vishandle = (XVisualInfo *) _mesa_malloc(sizeof(XVisualInfo));
      if (xmvis->vishandle) {
         _mesa_memcpy(xmvis->vishandle, xmvis->visinfo, sizeof(XVisualInfo));
      }
      return xmvis->vishandle;
#endif
   }
   else
      return NULL;
}


static GLXContext
Fake_glXCreateContext( Display *dpy, XVisualInfo *visinfo,
                       GLXContext share_list, Bool direct )
{
   XMesaVisual xmvis;
   struct fake_glx_context *glxCtx;
   struct fake_glx_context *shareCtx = (struct fake_glx_context *) share_list;

   if (!dpy || !visinfo)
      return 0;

   glxCtx = CALLOC_STRUCT(fake_glx_context);
   if (!glxCtx)
      return 0;

   /* deallocate unused windows/buffers */
   XMesaGarbageCollect();

   xmvis = find_glx_visual( dpy, visinfo );
   if (!xmvis) {
      /* This visual wasn't found with glXChooseVisual() */
      xmvis = create_glx_visual( dpy, visinfo );
      if (!xmvis) {
         /* unusable visual */
         FREE(glxCtx);
         return NULL;
      }
   }

   glxCtx->xmesaContext = XMesaCreateContext(xmvis,
                                   shareCtx ? shareCtx->xmesaContext : NULL);
   if (!glxCtx->xmesaContext) {
      FREE(glxCtx);
      return NULL;
   }

   glxCtx->xmesaContext->direct = GL_FALSE;
   glxCtx->glxContext.isDirect = GL_FALSE;
   glxCtx->glxContext.currentDpy = dpy;
   glxCtx->glxContext.xid = (XID) glxCtx;  /* self pointer */

   assert((void *) glxCtx == (void *) &(glxCtx->glxContext));

   return (GLXContext) glxCtx;
}


/* XXX these may have to be removed due to thread-safety issues. */
static GLXContext MakeCurrent_PrevContext = 0;
static GLXDrawable MakeCurrent_PrevDrawable = 0;
static GLXDrawable MakeCurrent_PrevReadable = 0;
static XMesaBuffer MakeCurrent_PrevDrawBuffer = 0;
static XMesaBuffer MakeCurrent_PrevReadBuffer = 0;


/* GLX 1.3 and later */
static Bool
Fake_glXMakeContextCurrent( Display *dpy, GLXDrawable draw,
                            GLXDrawable read, GLXContext ctx )
{
   struct fake_glx_context *glxCtx = (struct fake_glx_context *) ctx;

   if (ctx && draw && read) {
      XMesaBuffer drawBuffer, readBuffer;
      XMesaContext xmctx = glxCtx->xmesaContext;

      /* Find the XMesaBuffer which corresponds to the GLXDrawable 'draw' */
      if (ctx == MakeCurrent_PrevContext
          && draw == MakeCurrent_PrevDrawable) {
         drawBuffer = MakeCurrent_PrevDrawBuffer;
      }
      else {
         drawBuffer = XMesaFindBuffer( dpy, draw );
      }
      if (!drawBuffer) {
         /* drawable must be a new window! */
         drawBuffer = XMesaCreateWindowBuffer2( xmctx->xm_visual, draw, xmctx);
         if (!drawBuffer) {
            /* Out of memory, or context/drawable depth mismatch */
            return False;
         }
      }

      /* Find the XMesaBuffer which corresponds to the GLXDrawable 'read' */
      if (ctx == MakeCurrent_PrevContext
          && read == MakeCurrent_PrevReadable) {
         readBuffer = MakeCurrent_PrevReadBuffer;
      }
      else {
         readBuffer = XMesaFindBuffer( dpy, read );
      }
      if (!readBuffer) {
         /* drawable must be a new window! */
         readBuffer = XMesaCreateWindowBuffer2(glxCtx->xmesaContext->xm_visual,
                                               read, xmctx);
         if (!readBuffer) {
            /* Out of memory, or context/drawable depth mismatch */
            return False;
         }
      }

      MakeCurrent_PrevContext = ctx;
      MakeCurrent_PrevDrawable = draw;
      MakeCurrent_PrevReadable = read;
      MakeCurrent_PrevDrawBuffer = drawBuffer;
      MakeCurrent_PrevReadBuffer = readBuffer;

      /* Now make current! */
      if (XMesaMakeCurrent2(xmctx, drawBuffer, readBuffer)) {
         ((__GLXcontext *) ctx)->currentDpy = dpy;
         ((__GLXcontext *) ctx)->currentDrawable = draw;
         ((__GLXcontext *) ctx)->currentReadable = read;
         return True;
      }
      else {
         return False;
      }
   }
   else if (!ctx && !draw && !read) {
      /* release current context w/out assigning new one. */
      XMesaMakeCurrent( NULL, NULL );
      MakeCurrent_PrevContext = 0;
      MakeCurrent_PrevDrawable = 0;
      MakeCurrent_PrevReadable = 0;
      MakeCurrent_PrevDrawBuffer = 0;
      MakeCurrent_PrevReadBuffer = 0;