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+/* $XFree86: xc/programs/Xserver/GL/glx/glxscreens.c,v 1.10 2002/04/04 14:05:36 eich Exp $ */
+/*
+** 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.
+**
+*/
+
+#ifdef IN_MODULE
+#include <xf86_ansic.h>
+#else
+#include <string.h>
+#include <signal.h>
+#endif
+
+#include <windowstr.h>
+
+#include "glxserver.h"
+#include "glxutil.h"
+
+static char GLServerExtensions[] = 
+			"GL_ARB_imaging "
+			"GL_ARB_multitexture "
+			"GL_ARB_texture_border_clamp "
+			"GL_ARB_texture_cube_map "
+			"GL_ARB_texture_env_add "
+			"GL_ARB_texture_env_combine "
+			"GL_ARB_texture_env_dot3 "
+			"GL_ARB_transpose_matrix "
+			"GL_EXT_abgr "
+			"GL_EXT_blend_color "
+			"GL_EXT_blend_minmax "
+			"GL_EXT_blend_subtract "
+			"GL_EXT_texture_env_add "
+			"GL_EXT_texture_env_combine "
+			"GL_EXT_texture_env_dot3 "
+			"GL_EXT_texture_lod_bias "
+			;
+
+/*
+** We have made the simplifying assuption that the same extensions are 
+** supported across all screens in a multi-screen system.
+*/
+static char GLXServerVendorName[] = "SGI";
+static char GLXServerVersion[] = "1.2";
+static char GLXServerExtensions[] = 
+			"GLX_EXT_visual_info "
+			"GLX_EXT_visual_rating "
+			"GLX_EXT_import_context "
+			;
+
+/*
+** This comes from the GL library that the server will link with.  Right
+** now, that is the DDX Sample OpenGL.
+*/
+extern __GLXscreenInfo __glDDXScreenInfo;
+
+__GLXscreenInfo *__glXScreens[] = {
+    &__glDDXScreenInfo,
+};
+
+GLint __glXNumStaticScreens = (sizeof __glXScreens / sizeof __glXScreens[0]);
+
+__GLXscreenInfo *__glXActiveScreens;
+GLint __glXNumActiveScreens;
+
+RESTYPE __glXDrawableRes;
+
+static int
+CountBits(unsigned long mask)
+{
+    int count = 0;
+
+    while(mask) {
+	count += (mask&1);
+	mask >>= 1;
+    }
+
+    return count;
+}
+
+#if 0
+/*
+** A typical implementation would not probably not run through the screen's
+** visuals to find ones that match the visual configs supplied by the DDX
+** Sample OpenGL as we do here; we have done this to make this code easy to
+** drop into an existing X server.
+*/
+static int matchVisuals(__GLXvisualConfig *pGlxVisual, int numVisuals,
+			 int screen)
+{
+    int i, j;
+    __GLXvisualConfig *pvis = pGlxVisual;
+    ScreenPtr pScreen = screenInfo.screens[screen];
+    VisualPtr pVisual;
+    int numMatchingVisuals = 0; 
+    int *used;
+
+    used = (int *)__glXMalloc(pScreen->numVisuals*sizeof(int));
+    __glXMemset(used, 0, pScreen->numVisuals*sizeof(int));
+
+    for (i=0; i < numVisuals; i++, pvis++) {
+	/*
+	** Look through all the server's visuals to see which match.
+	*/
+	pvis->vid = 0;
+	pVisual = pScreen->visuals;
+	for (j=0; j < pScreen->numVisuals; j++, pVisual++) {
+	    if (pvis->class == pVisual->class &&
+		pvis->bufferSize == pVisual->nplanes &&
+		!used[j]) {
+		int rBits, gBits, bBits, aBits;
+
+		/* count bits per rgb */
+		rBits = CountBits(pVisual->redMask);
+		gBits = CountBits(pVisual->greenMask);
+		bBits = CountBits(pVisual->blueMask);
+		aBits = 0;
+		if ((pvis->redSize == rBits) &&
+		    (pvis->greenSize == gBits) &&
+		    (pvis->blueSize == bBits) &&
+		    (pvis->alphaSize == aBits)) {
+		    /*
+		    ** We'll consider this a match.
+		    */
+		    pvis->vid = pVisual->vid;
+		    pvis->redMask = pVisual->redMask;
+		    pvis->greenMask = pVisual->greenMask;
+		    pvis->blueMask = pVisual->blueMask;
+		    pvis->alphaMask = 0;
+		    numMatchingVisuals++;
+		    used[j] = 1;
+		    break;
+		}
+	    }
+	}
+    }
+    __glXFree(used);
+    return numMatchingVisuals;
+}
+#endif
+
+/*
+** Destroy routine that gets called when a drawable is freed.  A drawable
+** contains the ancillary buffers needed for rendering.
+*/
+static Bool DrawableGone(__GLXdrawablePrivate *glxPriv, XID xid)
+{
+    __GLXcontext *cx, *cx1;
+
+    /*
+    ** Use glxPriv->type to figure out what kind of drawable this is. Don't
+    ** use glxPriv->pDraw->type because by the time this routine is called,
+    ** the pDraw might already have been freed.
+    */
+    if (glxPriv->type == DRAWABLE_WINDOW) {
+	/*
+	** When a window is destroyed, notify all context bound to 
+	** it, that there are no longer bound to anything.
+	*/
+	for (cx = glxPriv->glxc; cx; cx = cx1) {
+	    cx1 = cx->nextPriv;
+	    cx->pendingState |= __GLX_PENDING_DESTROY;
+	}
+    }
+
+    /*
+    ** set the size to 0, so that context that may still be using this 
+    ** drawable not do anything harmful
+    */
+    glxPriv->xorigin = 0;
+    glxPriv->yorigin = 0;
+    glxPriv->width = 0;
+    glxPriv->height = 0;
+
+    __glXUnrefDrawablePrivate(glxPriv);
+
+    return True;
+}
+
+/*
+** This hook gets called when a window moves or changes size.
+*/
+static Bool PositionWindow(WindowPtr pWin, int x, int y)
+{
+    ScreenPtr pScreen;
+    __GLXcontext *glxc;
+    __GLXdrawablePrivate *glxPriv;
+    Bool ret;
+
+    /*
+    ** Call wrapped position window routine
+    */
+    pScreen = pWin->drawable.pScreen;
+    pScreen->PositionWindow =
+	__glXActiveScreens[pScreen->myNum].WrappedPositionWindow;
+    ret = (*pScreen->PositionWindow)(pWin, x, y);
+    pScreen->PositionWindow = PositionWindow;
+
+    /*
+    ** Tell all contexts rendering into this window that the window size
+    ** has changed.
+    */
+    glxPriv = (__GLXdrawablePrivate *) LookupIDByType(pWin->drawable.id,
+						      __glXDrawableRes);
+    if (glxPriv == NULL) {
+	/*
+	** This window is not being used by the OpenGL.
+	*/
+	return ret;
+    }
+
+    /*
+    ** resize the drawable
+    */
+    /* first change the drawable size */
+    if (__glXResizeDrawableBuffers(glxPriv) == GL_FALSE) {
+	/* resize failed! */
+	/* XXX: what can we possibly do here? */
+	ret = False;
+    }
+    /* mark contexts as needing resize */
+    glxc = NULL;
+    for (glxc = glxPriv->glxc; glxc; glxc = glxc->nextPriv) {
+	glxc->pendingState |= __GLX_PENDING_RESIZE;
+    }
+
+    return ret;
+}
+
+/*
+** Wrap our own PositionWindow routine around the server's, so we can
+** be notified when a window changes size
+*/
+static void wrapPositionWindow(int screen)
+{
+    ScreenPtr pScreen = screenInfo.screens[screen];
+
+    __glXActiveScreens[screen].WrappedPositionWindow = pScreen->PositionWindow;
+    pScreen->PositionWindow = PositionWindow;
+}
+
+void __glXScreenInit(GLint numscreens)
+{
+    GLint i,j;
+
+    /*
+    ** This alloc has to work or else the server might as well core dump.
+    */
+    __glXActiveScreens =
+      (__GLXscreenInfo *) __glXMalloc(sizeof(__GLXscreenInfo) * numscreens);
+    
+    for (i=0; i < numscreens; i++) {
+	/*
+	** Probe each static screen to see which exists.
+	*/
+	for (j=0; j < __glXNumStaticScreens; j++) {
+	    if ((*__glXScreens[j]->screenProbe)(i)) {
+		__glXActiveScreens[i] = *__glXScreens[j];
+
+#if 0
+                /* we don't use this since matchVisuals doesn't allow alpha */
+		__glXActiveScreens[i].numUsableVisuals =
+		    matchVisuals(__glXActiveScreens[i].pGlxVisual,
+			         __glXActiveScreens[i].numVisuals, i); 
+#else
+		__glXActiveScreens[i].numUsableVisuals = __glXActiveScreens[i].numVisuals;
+#endif
+		__glXActiveScreens[i].GLextensions = __glXStrdup(GLServerExtensions);
+		__glXActiveScreens[i].GLXvendor = __glXStrdup(GLXServerVendorName);
+		__glXActiveScreens[i].GLXversion = __glXStrdup(GLXServerVersion);
+		__glXActiveScreens[i].GLXextensions = __glXStrdup(GLXServerExtensions);
+
+#ifdef X11R5
+		__glXDrawableRes = CreateNewResourceType(DrawableGone);
+#else
+		__glXDrawableRes = CreateNewResourceType((DeleteType)DrawableGone);
+#endif
+		wrapPositionWindow(i);
+	    }
+	}
+    }
+    __glXNumActiveScreens = numscreens;
+}
+
+void __glXScreenReset(void)
+{
+  int i;
+
+  for (i = 0; i < __glXNumActiveScreens; i++) {
+      __glXFree(__glXActiveScreens[i].GLXvendor);
+      __glXFree(__glXActiveScreens[i].GLXversion);
+      __glXFree(__glXActiveScreens[i].GLXextensions);
+      __glXFree(__glXActiveScreens[i].GLextensions);
+  }
+  xfree(__glXActiveScreens);
+  __glXActiveScreens = NULL;
+  __glXNumActiveScreens = 0;
+}