initial state (xorg-server 1.10.2)

1 files changed, 839 insertions, 0 deletions

diff --git a/glx/glxdri2.c b/glx/glxdri2.c
new file mode 100644
index 0000000..c4b7ba4
--- /dev/null
+++ b/glx/glxdri2.c
@@ -0,0 +1,839 @@
+/*
+ * Copyright © 2007 Red Hat, Inc
+ *
+ * Permission to use, copy, modify, distribute, and sell this software
+ * and its documentation for any purpose is hereby granted without
+ * fee, provided that the above copyright notice appear in all copies
+ * and that both that copyright notice and this permission notice
+ * appear in supporting documentation, and that the name of Red Hat,
+ * Inc not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission.  Red Hat, Inc makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * RED HAT, INC DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
+ * NO EVENT SHALL RED HAT, INC BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+ * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+ * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <dlfcn.h>
+
+#include <drm.h>
+#include <GL/gl.h>
+#include <GL/internal/dri_interface.h>
+#include <GL/glxtokens.h>
+
+#include <windowstr.h>
+#include <os.h>
+
+#define _XF86DRI_SERVER_
+#include <xf86drm.h>
+#include <xf86.h>
+#include <dri2.h>
+
+#include "glxserver.h"
+#include "glxutil.h"
+#include "glxdricommon.h"
+
+#include "glapitable.h"
+#include "glapi.h"
+#include "glthread.h"
+#include "dispatch.h"
+#include "extension_string.h"
+
+typedef struct __GLXDRIscreen   __GLXDRIscreen;
+typedef struct __GLXDRIcontext  __GLXDRIcontext;
+typedef struct __GLXDRIdrawable __GLXDRIdrawable;
+
+struct __GLXDRIscreen {
+    __GLXscreen		 base;
+    __DRIscreen		*driScreen;
+    void		*driver;
+    int			 fd;
+
+    xf86EnterVTProc	*enterVT;
+    xf86LeaveVTProc	*leaveVT;
+
+    const __DRIcoreExtension *core;
+    const __DRIdri2Extension *dri2;
+    const __DRI2flushExtension *flush;
+    const __DRIcopySubBufferExtension *copySubBuffer;
+    const __DRIswapControlExtension *swapControl;
+    const __DRItexBufferExtension *texBuffer;
+
+    unsigned char glx_enable_bits[__GLX_EXT_BYTES];
+};
+
+struct __GLXDRIcontext {
+    __GLXcontext	 base;
+    __DRIcontext	*driContext;
+};
+
+#define MAX_DRAWABLE_BUFFERS 5
+
+struct __GLXDRIdrawable {
+    __GLXdrawable	 base;
+    __DRIdrawable	*driDrawable;
+    __GLXDRIscreen	*screen;
+
+    /* Dimensions as last reported by DRI2GetBuffers. */
+    int width;
+    int height;
+    __DRIbuffer buffers[MAX_DRAWABLE_BUFFERS];
+    int count;
+};
+
+static void
+__glXDRIdrawableDestroy(__GLXdrawable *drawable)
+{
+    __GLXDRIdrawable *private = (__GLXDRIdrawable *) drawable;
+    const __DRIcoreExtension *core = private->screen->core;
+    
+    (*core->destroyDrawable)(private->driDrawable);
+
+    __glXDrawableRelease(drawable);
+
+    free(private);
+}
+
+static void
+__glXDRIdrawableCopySubBuffer(__GLXdrawable *drawable,
+			       int x, int y, int w, int h)
+{
+    __GLXDRIdrawable *private = (__GLXDRIdrawable *) drawable;
+    BoxRec box;
+    RegionRec region;
+
+    box.x1 = x;
+    box.y1 = private->height - y - h;
+    box.x2 = x + w;
+    box.y2 = private->height - y;
+    RegionInit(&region, &box, 0);
+
+    DRI2CopyRegion(drawable->pDraw, &region,
+		   DRI2BufferFrontLeft, DRI2BufferBackLeft);
+}
+
+static void
+__glXDRIdrawableWaitX(__GLXdrawable *drawable)
+{
+    __GLXDRIdrawable *private = (__GLXDRIdrawable *) drawable;
+    BoxRec box;
+    RegionRec region;
+
+    box.x1 = 0;
+    box.y1 = 0;
+    box.x2 = private->width;
+    box.y2 = private->height;
+    RegionInit(&region, &box, 0);
+
+    DRI2CopyRegion(drawable->pDraw, &region,
+		   DRI2BufferFakeFrontLeft, DRI2BufferFrontLeft);
+}
+
+static void
+__glXDRIdrawableWaitGL(__GLXdrawable *drawable)
+{
+    __GLXDRIdrawable *private = (__GLXDRIdrawable *) drawable;
+    BoxRec box;
+    RegionRec region;
+
+    box.x1 = 0;
+    box.y1 = 0;
+    box.x2 = private->width;
+    box.y2 = private->height;
+    RegionInit(&region, &box, 0);
+
+    DRI2CopyRegion(drawable->pDraw, &region,
+		   DRI2BufferFrontLeft, DRI2BufferFakeFrontLeft);
+}
+
+static void
+__glXdriSwapEvent(ClientPtr client, void *data, int type, CARD64 ust,
+		  CARD64 msc, CARD64 sbc)
+{
+    __GLXdrawable *drawable = data;
+    xGLXBufferSwapComplete wire;
+
+    if (!(drawable->eventMask & GLX_BUFFER_SWAP_COMPLETE_INTEL_MASK))
+	return;
+
+    wire.type = __glXEventBase + GLX_BufferSwapComplete;
+    switch (type) {
+    case DRI2_EXCHANGE_COMPLETE:
+	wire.event_type = GLX_EXCHANGE_COMPLETE_INTEL;
+	break;
+    case DRI2_BLIT_COMPLETE:
+	wire.event_type = GLX_BLIT_COMPLETE_INTEL;
+	break;
+    case DRI2_FLIP_COMPLETE:
+	wire.event_type = GLX_FLIP_COMPLETE_INTEL;
+	break;
+    default:
+	/* unknown swap completion type */
+	wire.event_type = 0;
+	break;
+    }
+    wire.drawable = drawable->drawId;
+    wire.ust_hi = ust >> 32;
+    wire.ust_lo = ust & 0xffffffff;
+    wire.msc_hi = msc >> 32;
+    wire.msc_lo = msc & 0xffffffff;
+    wire.sbc_hi = sbc >> 32;
+    wire.sbc_lo = sbc & 0xffffffff;
+
+    WriteEventsToClient(client, 1, (xEvent *) &wire);
+}
+
+/*
+ * Copy or flip back to front, honoring the swap interval if possible.
+ *
+ * If the kernel supports it, we request an event for the frame when the
+ * swap should happen, then perform the copy when we receive it.
+ */
+static GLboolean
+__glXDRIdrawableSwapBuffers(ClientPtr client, __GLXdrawable *drawable)
+{
+    __GLXDRIdrawable *priv = (__GLXDRIdrawable *) drawable;
+    __GLXDRIscreen *screen = priv->screen;
+    CARD64 unused;
+
+#if __DRI2_FLUSH_VERSION >= 3
+    if (screen->flush) {
+	(*screen->flush->flush)(priv->driDrawable);
+	(*screen->flush->invalidate)(priv->driDrawable);
+    }
+#else
+    if (screen->flush)
+	(*screen->flush->flushInvalidate)(priv->driDrawable);
+#endif
+
+    if (DRI2SwapBuffers(client, drawable->pDraw, 0, 0, 0, &unused,
+			__glXdriSwapEvent, drawable->pDraw) != Success)
+	return FALSE;
+
+    return TRUE;
+}
+
+static int
+__glXDRIdrawableSwapInterval(__GLXdrawable *drawable, int interval)
+{
+    if (interval <= 0) /* || interval > BIGNUM? */
+	return GLX_BAD_VALUE;
+
+    DRI2SwapInterval(drawable->pDraw, interval);
+
+    return 0;
+}
+
+static void
+__glXDRIcontextDestroy(__GLXcontext *baseContext)
+{
+    __GLXDRIcontext *context = (__GLXDRIcontext *) baseContext;
+    __GLXDRIscreen *screen = (__GLXDRIscreen *) context->base.pGlxScreen;
+
+    (*screen->core->destroyContext)(context->driContext);
+    __glXContextDestroy(&context->base);
+    free(context);
+}
+
+static int
+__glXDRIcontextMakeCurrent(__GLXcontext *baseContext)
+{
+    __GLXDRIcontext *context = (__GLXDRIcontext *) baseContext;
+    __GLXDRIdrawable *draw = (__GLXDRIdrawable *) baseContext->drawPriv;
+    __GLXDRIdrawable *read = (__GLXDRIdrawable *) baseContext->readPriv;
+    __GLXDRIscreen *screen = (__GLXDRIscreen *) context->base.pGlxScreen;
+
+    return (*screen->core->bindContext)(context->driContext,
+					draw->driDrawable,
+					read->driDrawable);
+}					      
+
+static int
+__glXDRIcontextLoseCurrent(__GLXcontext *baseContext)
+{
+    __GLXDRIcontext *context = (__GLXDRIcontext *) baseContext;
+    __GLXDRIscreen *screen = (__GLXDRIscreen *) context->base.pGlxScreen;
+
+    return (*screen->core->unbindContext)(context->driContext);
+}
+
+static int
+__glXDRIcontextCopy(__GLXcontext *baseDst, __GLXcontext *baseSrc,
+		    unsigned long mask)
+{
+    __GLXDRIcontext *dst = (__GLXDRIcontext *) baseDst;
+    __GLXDRIcontext *src = (__GLXDRIcontext *) baseSrc;
+    __GLXDRIscreen *screen = (__GLXDRIscreen *) dst->base.pGlxScreen;
+
+    return (*screen->core->copyContext)(dst->driContext,
+					src->driContext, mask);
+}
+
+static int
+__glXDRIcontextForceCurrent(__GLXcontext *baseContext)
+{
+    __GLXDRIcontext *context = (__GLXDRIcontext *) baseContext;
+    __GLXDRIdrawable *draw = (__GLXDRIdrawable *) baseContext->drawPriv;
+    __GLXDRIdrawable *read = (__GLXDRIdrawable *) baseContext->readPriv;
+    __GLXDRIscreen *screen = (__GLXDRIscreen *) context->base.pGlxScreen;
+
+    return (*screen->core->bindContext)(context->driContext,
+					draw->driDrawable,
+					read->driDrawable);
+}
+
+static Bool
+__glXDRIcontextWait(__GLXcontext *baseContext,
+		    __GLXclientState *cl, int *error)
+{
+    if (DRI2WaitSwap(cl->client, baseContext->drawPriv->pDraw)) {
+	*error = cl->client->noClientException;
+	return TRUE;
+    }
+
+    return FALSE;
+}
+
+#ifdef __DRI_TEX_BUFFER
+
+static int
+__glXDRIbindTexImage(__GLXcontext *baseContext,
+		     int buffer,
+		     __GLXdrawable *glxPixmap)
+{
+    __GLXDRIdrawable *drawable = (__GLXDRIdrawable *) glxPixmap;
+    const __DRItexBufferExtension *texBuffer = drawable->screen->texBuffer;
+    __GLXDRIcontext *context = (__GLXDRIcontext *) baseContext;
+
+    if (texBuffer == NULL)
+        return Success;
+
+#if __DRI_TEX_BUFFER_VERSION >= 2
+    if (texBuffer->base.version >= 2 && texBuffer->setTexBuffer2 != NULL) {
+	(*texBuffer->setTexBuffer2)(context->driContext,
+				    glxPixmap->target,
+				    glxPixmap->format,
+				    drawable->driDrawable);
+    } else
+#endif
+    {
+	texBuffer->setTexBuffer(context->driContext,
+				glxPixmap->target,
+				drawable->driDrawable);
+    }
+
+    return Success;
+}
+
+static int
+__glXDRIreleaseTexImage(__GLXcontext *baseContext,
+			int buffer,
+			__GLXdrawable *pixmap)
+{
+    /* FIXME: Just unbind the texture? */
+    return Success;
+}
+
+#else
+
+static int
+__glXDRIbindTexImage(__GLXcontext *baseContext,
+		     int buffer,
+		     __GLXdrawable *glxPixmap)
+{
+    return Success;
+}
+
+static int
+__glXDRIreleaseTexImage(__GLXcontext *baseContext,
+			int buffer,
+			__GLXdrawable *pixmap)
+{
+    return Success;
+}
+
+#endif
+
+static __GLXtextureFromPixmap __glXDRItextureFromPixmap = {
+    __glXDRIbindTexImage,
+    __glXDRIreleaseTexImage
+};
+
+static void
+__glXDRIscreenDestroy(__GLXscreen *baseScreen)
+{
+    __GLXDRIscreen *screen = (__GLXDRIscreen *) baseScreen;
+
+    (*screen->core->destroyScreen)(screen->driScreen);
+
+    dlclose(screen->driver);
+
+    __glXScreenDestroy(baseScreen);
+
+    free(screen);
+}
+
+static __GLXcontext *
+__glXDRIscreenCreateContext(__GLXscreen *baseScreen,
+			    __GLXconfig *glxConfig,
+			    __GLXcontext *baseShareContext)
+{
+    __GLXDRIscreen *screen = (__GLXDRIscreen *) baseScreen;
+    __GLXDRIcontext *context, *shareContext;
+    __GLXDRIconfig *config = (__GLXDRIconfig *) glxConfig;
+    __DRIcontext *driShare;
+
+    shareContext = (__GLXDRIcontext *) baseShareContext;
+    if (shareContext)
+	driShare = shareContext->driContext;
+    else
+	driShare = NULL;
+
+    context = calloc(1, sizeof *context);
+    if (context == NULL)
+	return NULL;
+
+    context->base.destroy           = __glXDRIcontextDestroy;
+    context->base.makeCurrent       = __glXDRIcontextMakeCurrent;
+    context->base.loseCurrent       = __glXDRIcontextLoseCurrent;
+    context->base.copy              = __glXDRIcontextCopy;
+    context->base.forceCurrent      = __glXDRIcontextForceCurrent;
+    context->base.textureFromPixmap = &__glXDRItextureFromPixmap;
+    context->base.wait              = __glXDRIcontextWait;
+
+    context->driContext =
+	(*screen->dri2->createNewContext)(screen->driScreen,
+					  config->driConfig,
+					  driShare, context);
+    if (context->driContext == NULL) {
+	    free(context);
+        return NULL;
+    }
+
+    return &context->base;
+}
+
+static void
+__glXDRIinvalidateBuffers(DrawablePtr pDraw, void *priv)
+{
+#if __DRI2_FLUSH_VERSION >= 3
+    __GLXDRIdrawable *private = priv;
+    __GLXDRIscreen *screen = private->screen;
+
+    if (screen->flush)
+	(*screen->flush->invalidate)(private->driDrawable);
+#endif
+}
+
+static __GLXdrawable *
+__glXDRIscreenCreateDrawable(ClientPtr client,
+			     __GLXscreen *screen,
+			     DrawablePtr pDraw,
+			     XID drawId,
+			     int type,
+			     XID glxDrawId,
+			     __GLXconfig *glxConfig)
+{
+    __GLXDRIscreen *driScreen = (__GLXDRIscreen *) screen;
+    __GLXDRIconfig *config = (__GLXDRIconfig *) glxConfig;
+    __GLXDRIdrawable *private;
+
+    private = calloc(1, sizeof *private);
+    if (private == NULL)
+	return NULL;
+
+    private->screen = driScreen;
+    if (!__glXDrawableInit(&private->base, screen,
+			   pDraw, type, glxDrawId, glxConfig)) {
+        free(private);
+	return NULL;
+    }
+
+    private->base.destroy       = __glXDRIdrawableDestroy;
+    private->base.swapBuffers   = __glXDRIdrawableSwapBuffers;
+    private->base.copySubBuffer = __glXDRIdrawableCopySubBuffer;
+    private->base.waitGL	= __glXDRIdrawableWaitGL;
+    private->base.waitX		= __glXDRIdrawableWaitX;
+
+    if (DRI2CreateDrawable(client, pDraw, drawId,
+			   __glXDRIinvalidateBuffers, private)) {
+	    free(private);
+	    return NULL;
+    }
+
+    private->driDrawable =
+	(*driScreen->dri2->createNewDrawable)(driScreen->driScreen,
+					      config->driConfig, private);
+
+    return &private->base;
+}
+
+static __DRIbuffer *
+dri2GetBuffers(__DRIdrawable *driDrawable,
+	       int *width, int *height,
+	       unsigned int *attachments, int count,
+	       int *out_count, void *loaderPrivate)
+{
+    __GLXDRIdrawable *private = loaderPrivate;
+    DRI2BufferPtr *buffers;
+    int i;
+    int j;
+
+    buffers = DRI2GetBuffers(private->base.pDraw,
+			     width, height, attachments, count, out_count);
+    if (*out_count > MAX_DRAWABLE_BUFFERS) {
+	*out_count = 0;
+	return NULL;
+    }
+	
+    private->width = *width;
+    private->height = *height;
+
+    /* This assumes the DRI2 buffer attachment tokens matches the
+     * __DRIbuffer tokens. */
+    j = 0;
+    for (i = 0; i < *out_count; i++) {
+	/* Do not send the real front buffer of a window to the client.
+	 */
+	if ((private->base.pDraw->type == DRAWABLE_WINDOW)
+	    && (buffers[i]->attachment == DRI2BufferFrontLeft)) {
+	    continue;
+	}
+
+	private->buffers[j].attachment = buffers[i]->attachment;
+	private->buffers[j].name = buffers[i]->name;
+	private->buffers[j].pitch = buffers[i]->pitch;
+	private->buffers[j].cpp = buffers[i]->cpp;
+	private->buffers[j].flags = buffers[i]->flags;
+	j++;
+    }
+
+    *out_count = j;
+    return private->buffers;
+}
+
+static __DRIbuffer *
+dri2GetBuffersWithFormat(__DRIdrawable *driDrawable,
+			 int *width, int *height,
+			 unsigned int *attachments, int count,
+			 int *out_count, void *loaderPrivate)
+{
+    __GLXDRIdrawable *private = loaderPrivate;
+    DRI2BufferPtr *buffers;
+    int i;
+    int j = 0;
+
+    buffers = DRI2GetBuffersWithFormat(private->base.pDraw,
+				       width, height, attachments, count,
+				       out_count);
+    if (*out_count > MAX_DRAWABLE_BUFFERS) {
+	*out_count = 0;
+	return NULL;
+    }
+
+    private->width = *width;
+    private->height = *height;
+
+    /* This assumes the DRI2 buffer attachment tokens matches the
+     * __DRIbuffer tokens. */
+    for (i = 0; i < *out_count; i++) {
+	/* Do not send the real front buffer of a window to the client.
+	 */
+	if ((private->base.pDraw->type == DRAWABLE_WINDOW)
+	    && (buffers[i]->attachment == DRI2BufferFrontLeft)) {
+	    continue;
+	}
+
+	private->buffers[j].attachment = buffers[i]->attachment;
+	private->buffers[j].name = buffers[i]->name;
+	private->buffers[j].pitch = buffers[i]->pitch;
+	private->buffers[j].cpp = buffers[i]->cpp;
+	private->buffers[j].flags = buffers[i]->flags;
+	j++;
+    }
+
+    *out_count = j;
+    return private->buffers;
+}
+
+static void 
+dri2FlushFrontBuffer(__DRIdrawable *driDrawable, void *loaderPrivate)
+{
+    (void) driDrawable;
+    __glXDRIdrawableWaitGL((__GLXdrawable *) loaderPrivate);
+}
+
+static const __DRIdri2LoaderExtension loaderExtension = {
+    { __DRI_DRI2_LOADER, __DRI_DRI2_LOADER_VERSION },
+    dri2GetBuffers,
+    dri2FlushFrontBuffer,
+    dri2GetBuffersWithFormat,
+};
+
+#ifdef __DRI_USE_INVALIDATE
+static const __DRIuseInvalidateExtension dri2UseInvalidate = {
+   { __DRI_USE_INVALIDATE, __DRI_USE_INVALIDATE_VERSION }
+};
+#endif
+
+static const __DRIextension *loader_extensions[] = {
+    &systemTimeExtension.base,
+    &loaderExtension.base,
+#ifdef __DRI_USE_INVALIDATE
+    &dri2UseInvalidate.base,
+#endif
+    NULL
+};
+
+static const char dri_driver_path[] = DRI_DRIVER_PATH;
+
+static Bool
+glxDRIEnterVT (int index, int flags)
+{
+    ScrnInfoPtr scrn = xf86Screens[index];
+    Bool	ret;
+    __GLXDRIscreen *screen = (__GLXDRIscreen *) 
+	glxGetScreen(screenInfo.screens[index]);
+
+    LogMessage(X_INFO, "AIGLX: Resuming AIGLX clients after VT switch\n");
+
+    scrn->EnterVT = screen->enterVT;
+
+    ret = scrn->EnterVT (index, flags);
+
+    screen->enterVT = scrn->EnterVT;
+    scrn->EnterVT = glxDRIEnterVT;
+
+    if (!ret)
+	return FALSE;
+    
+    glxResumeClients();
+
+    return TRUE;
+}
+
+static void
+glxDRILeaveVT (int index, int flags)
+{
+    ScrnInfoPtr scrn = xf86Screens[index];
+    __GLXDRIscreen *screen = (__GLXDRIscreen *)
+	glxGetScreen(screenInfo.screens[index]);
+
+    LogMessage(X_INFO, "AIGLX: Suspending AIGLX clients for VT switch\n");
+
+    glxSuspendClients();
+
+    scrn->LeaveVT = screen->leaveVT;
+    (*screen->leaveVT) (index, flags);
+    screen->leaveVT = scrn->LeaveVT;
+    scrn->LeaveVT = glxDRILeaveVT;
+}
+
+static void
+initializeExtensions(__GLXDRIscreen *screen)
+{
+    ScreenPtr pScreen = screen->base.pScreen;
+    const __DRIextension **extensions;
+    int i;
+
+    extensions = screen->core->getExtensions(screen->driScreen);
+
+    __glXEnableExtension(screen->glx_enable_bits,
+			 "GLX_MESA_copy_sub_buffer");
+    LogMessage(X_INFO, "AIGLX: enabled GLX_MESA_copy_sub_buffer\n");
+
+    __glXEnableExtension(screen->glx_enable_bits, "GLX_INTEL_swap_event");
+    LogMessage(X_INFO, "AIGLX: enabled GLX_INTEL_swap_event\n");
+
+    if (DRI2HasSwapControl(pScreen)) {
+	__glXEnableExtension(screen->glx_enable_bits,
+			     "GLX_SGI_swap_control");
+	__glXEnableExtension(screen->glx_enable_bits,
+			     "GLX_MESA_swap_control");
+	LogMessage(X_INFO, "AIGLX: enabled GLX_SGI_swap_control and GLX_MESA_swap_control\n");
+    }
+
+    for (i = 0; extensions[i]; i++) {
+#ifdef __DRI_READ_DRAWABLE
+	if (strcmp(extensions[i]->name, __DRI_READ_DRAWABLE) == 0) {
+	    __glXEnableExtension(screen->glx_enable_bits,
+				 "GLX_SGI_make_current_read");
+
+	    LogMessage(X_INFO, "AIGLX: enabled GLX_SGI_make_current_read\n");
+	}
+#endif
+
+#ifdef __DRI_TEX_BUFFER
+	if (strcmp(extensions[i]->name, __DRI_TEX_BUFFER) == 0) {
+	    screen->texBuffer =
+		(const __DRItexBufferExtension *) extensions[i];
+	    /* GLX_EXT_texture_from_pixmap is always enabled. */
+	    LogMessage(X_INFO, "AIGLX: GLX_EXT_texture_from_pixmap backed by buffer objects\n");
+	}
+#endif
+
+#ifdef __DRI2_FLUSH
+	if (strcmp(extensions[i]->name, __DRI2_FLUSH) == 0 &&
+	    extensions[i]->version >= 3) {
+		screen->flush = (__DRI2flushExtension *) extensions[i];
+	}
+#endif
+
+	/* Ignore unknown extensions */
+    }
+}
+
+static __GLXscreen *
+__glXDRIscreenProbe(ScreenPtr pScreen)
+{
+    const char *driverName, *deviceName;
+    __GLXDRIscreen *screen;
+    char filename[128];
+    size_t buffer_size;
+    ScrnInfoPtr pScrn = xf86Screens[pScreen->myNum];
+    const __DRIextension **extensions;
+    const __DRIconfig **driConfigs;
+    int i;
+
+    screen = calloc(1, sizeof *screen);
+    if (screen == NULL)
+	return NULL;
+
+    if (!xf86LoaderCheckSymbol("DRI2Connect") ||
+	!DRI2Connect(pScreen, DRI2DriverDRI,
+		     &screen->fd, &driverName, &deviceName)) {
+	LogMessage(X_INFO,
+		   "AIGLX: Screen %d is not DRI2 capable\n", pScreen->myNum);
+	return NULL;
+    }
+
+    screen->base.destroy        = __glXDRIscreenDestroy;
+    screen->base.createContext  = __glXDRIscreenCreateContext;
+    screen->base.createDrawable = __glXDRIscreenCreateDrawable;
+    screen->base.swapInterval   = __glXDRIdrawableSwapInterval;
+    screen->base.pScreen       = pScreen;
+
+    __glXInitExtensionEnableBits(screen->glx_enable_bits);
+
+    snprintf(filename, sizeof filename,
+	     "%s/%s_dri.so", dri_driver_path, driverName);
+
+    screen->driver = dlopen(filename, RTLD_LAZY | RTLD_LOCAL);
+    if (screen->driver == NULL) {
+	LogMessage(X_ERROR, "AIGLX error: dlopen of %s failed (%s)\n",
+		   filename, dlerror());
+        goto handle_error;
+    }
+
+    extensions = dlsym(screen->driver, __DRI_DRIVER_EXTENSIONS);
+    if (extensions == NULL) {
+	LogMessage(X_ERROR, "AIGLX error: %s exports no extensions (%s)\n",
+		   driverName, dlerror());
+	goto handle_error;
+    }
+    
+    for (i = 0; extensions[i]; i++) {
+        if (strcmp(extensions[i]->name, __DRI_CORE) == 0 &&
+	    extensions[i]->version >= 1) {
+		screen->core = (const __DRIcoreExtension *) extensions[i];
+	}
+        if (strcmp(extensions[i]->name, __DRI_DRI2) == 0 &&
+	    extensions[i]->version >= 1) {
+		screen->dri2 = (const __DRIdri2Extension *) extensions[i];
+	}
+    }
+
+    if (screen->core == NULL || screen->dri2 == NULL) {
+	LogMessage(X_ERROR, "AIGLX error: %s exports no DRI extension\n",
+		   driverName);
+	goto handle_error;
+    }
+
+    screen->driScreen =
+	(*screen->dri2->createNewScreen)(pScreen->myNum,
+					 screen->fd,
+					 loader_extensions,
+					 &driConfigs,
+					 screen);
+
+    if (screen->driScreen == NULL) {
+	LogMessage(X_ERROR,
+		   "AIGLX error: Calling driver entry point failed\n");
+	goto handle_error;
+    }
+
+    initializeExtensions(screen);
+
+    screen->base.fbconfigs = glxConvertConfigs(screen->core, driConfigs,
+					       GLX_WINDOW_BIT |
+					       GLX_PIXMAP_BIT |
+					       GLX_PBUFFER_BIT);
+
+    __glXScreenInit(&screen->base, pScreen);
+
+    /* The first call simply determines the length of the extension string.
+     * This allows us to allocate some memory to hold the extension string,
+     * but it requires that we call __glXGetExtensionString a second time.
+     */
+    buffer_size = __glXGetExtensionString(screen->glx_enable_bits, NULL);
+    if (buffer_size > 0) {
+	free(screen->base.GLXextensions);
+
+	screen->base.GLXextensions = xnfalloc(buffer_size);
+	(void) __glXGetExtensionString(screen->glx_enable_bits, 
+				       screen->base.GLXextensions);
+    }
+
+    /* We're going to assume (perhaps incorrectly?) that all DRI2-enabled
+     * drivers support the required extensions for GLX 1.4.  The extensions
+     * we're assuming are:
+     *
+     *    - GLX_SGI_make_current_read (1.3)
+     *    - GLX_SGIX_fbconfig (1.3)
+     *    - GLX_SGIX_pbuffer (1.3)
+     *    - GLX_ARB_multisample (1.4)
+     */
+    screen->base.GLXmajor = 1;
+    screen->base.GLXminor = 4;
+    
+    screen->enterVT = pScrn->EnterVT;
+    pScrn->EnterVT = glxDRIEnterVT; 
+    screen->leaveVT = pScrn->LeaveVT;
+    pScrn->LeaveVT = glxDRILeaveVT;
+
+    LogMessage(X_INFO,
+	       "AIGLX: Loaded and initialized %s\n", filename);
+
+    return &screen->base;
+
+ handle_error:
+    if (screen->driver)
+        dlclose(screen->driver);
+
+    free(screen);
+
+    LogMessage(X_ERROR, "AIGLX: reverting to software rendering\n");
+
+    return NULL;
+}
+
+_X_EXPORT __GLXprovider __glXDRI2Provider = {
+    __glXDRIscreenProbe,
+    "DRI2",
+    NULL
+};