DRI interface changes and DRI2 direct rendering support.

Add DRI2 direct rendering support to libGL and add DRI2 client side
protocol code.  Extend the GLX 1.3 create drawable functions in
glx_pbuffer.c to call into the DRI driver when possible.

Introduce __DRIconfig, opaque struct that represents a DRI driver
configuration.  Get's rid of the open coded __GLcontextModes in the
DRI driver interface and the context modes create and destroy
functions that the loader was requires to provide.  glcore.h is no
longer part of the DRI driver interface.  The DRI config is GL binding
agnostic, that is, not specific to GLX, EGL or other bindings.

The core API is now also an extension, and the driver exports a list
of extensions as the symbol __driDriverExtensions, which the loader
must dlsym() for.  The list of extension will always include the DRI
core extension, which allows creating and manipulating DRI screens,
drawables and contexts.  The DRI legacy extension, when available,
provides alternative entry points for creating the DRI objects that
work with the XF86DRI infrastructure.

Change DRI2 client code to not use drm drawables or contexts.  We
never used drm_drawable_t's and the only use for drm_context_t was as
a unique identifier when taking the lock.  We now just allocate a
unique lock ID out of the DRILock sarea block.  Once we get rid of the
lock entirely, we can drop this hack.

Change the interface between dri_util.c and the drivers, so that the
drivers now export the DriverAPI struct as driDriverAPI instead of the
InitScreen entry point.  This lets us avoid dlsym()'ing for the DRI2
init screen function to see if DRI2 is supported by the driver.

1 files changed, 471 insertions, 0 deletions

diff --git a/src/glx/x11/dri2_glx.c b/src/glx/x11/dri2_glx.c
new file mode 100644
index 0000000000..1a6abaedab
--- /dev/null
+++ b/src/glx/x11/dri2_glx.c
@@ -0,0 +1,471 @@
+/*
+ * Copyright © 2008 Red Hat, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Soft-
+ * ware"), to deal in the Software without restriction, including without
+ * limitation the rights to use, copy, modify, merge, publish, distribute,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, provided that the above copyright
+ * notice(s) and this permission notice appear in all copies of the Soft-
+ * ware and that both the above copyright notice(s) and this permission
+ * notice appear in supporting documentation.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
+ * ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY
+ * RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN
+ * THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSE-
+ * QUENTIAL 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 PERFOR-
+ * MANCE OF THIS SOFTWARE.
+ *
+ * Except as contained in this notice, the name of a copyright holder shall
+ * not be used in advertising or otherwise to promote the sale, use or
+ * other dealings in this Software without prior written authorization of
+ * the copyright holder.
+ *
+ * Authors:
+ *   Kristian Høgsberg (krh@redhat.com)
+ */
+
+#ifdef GLX_DIRECT_RENDERING
+
+#include <unistd.h>
+#include <X11/Xlibint.h>
+#include <X11/extensions/Xext.h>
+#include <X11/extensions/extutil.h>
+#include <X11/extensions/Xfixes.h>
+#include <X11/extensions/Xdamage.h>
+#include "glheader.h"
+#include "glxclient.h"
+#include "xf86dri.h"
+#include "sarea.h"
+#include <stdio.h>
+#include <dlfcn.h>
+#include <sys/types.h>
+#include <stdarg.h>
+#include "glcontextmodes.h"
+#include <sys/mman.h>
+#include "xf86drm.h"
+#include "dri2.h"
+
+
+#ifndef RTLD_NOW
+#define RTLD_NOW 0
+#endif
+#ifndef RTLD_GLOBAL
+#define RTLD_GLOBAL 0
+#endif
+
+typedef struct __GLXDRIdisplayPrivateRec __GLXDRIdisplayPrivate;
+typedef struct __GLXDRIcontextPrivateRec __GLXDRIcontextPrivate;
+typedef struct __GLXDRIconfigPrivateRec  __GLXDRIconfigPrivate;
+
+struct __GLXDRIdisplayPrivateRec {
+    __GLXDRIdisplay base;
+
+    /*
+    ** XFree86-DRI version information
+    */
+    int driMajor;
+    int driMinor;
+    int driPatch;
+};
+
+struct __GLXDRIcontextPrivateRec {
+    __GLXDRIcontext base;
+    __DRIcontext *driContext;
+    __GLXscreenConfigs *psc;
+};
+
+struct __GLXDRIconfigPrivateRec {
+    __GLcontextModes modes;
+    const __DRIconfig *driConfig;
+};
+
+static void dri2DestroyContext(__GLXDRIcontext *context,
+			      __GLXscreenConfigs *psc, Display *dpy)
+{
+    __GLXDRIcontextPrivate *pcp = (__GLXDRIcontextPrivate *) context;
+    const __DRIcoreExtension *core = pcp->psc->core;
+
+    (*core->destroyContext)(pcp->driContext);
+
+    Xfree(pcp);
+}
+
+static Bool dri2BindContext(__GLXDRIcontext *context,
+			   __GLXDRIdrawable *draw, __GLXDRIdrawable *read)
+{
+    __GLXDRIcontextPrivate *pcp = (__GLXDRIcontextPrivate *) context;
+    const __DRIcoreExtension *core = pcp->psc->core;
+
+    return (*core->bindContext)(pcp->driContext,
+				draw->driDrawable,
+				read->driDrawable);
+}
+
+static void dri2UnbindContext(__GLXDRIcontext *context)
+{
+    __GLXDRIcontextPrivate *pcp = (__GLXDRIcontextPrivate *) context;
+    const __DRIcoreExtension *core = pcp->psc->core;
+
+    (*core->unbindContext)(pcp->driContext);
+}
+
+static __GLXDRIcontext *dri2CreateContext(__GLXscreenConfigs *psc,
+					 const __GLcontextModes *mode,
+					 GLXContext gc,
+					 GLXContext shareList, int renderType)
+{
+    __GLXDRIcontextPrivate *pcp, *pcp_shared;
+    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) mode;
+    const __DRIcoreExtension *core = psc->core;
+    __DRIcontext *shared = NULL;
+
+    if (shareList) {
+	pcp_shared = (__GLXDRIcontextPrivate *) shareList->driContext;
+	shared = pcp_shared->driContext;
+    }
+
+    pcp = Xmalloc(sizeof *pcp);
+    if (pcp == NULL)
+	return NULL;
+
+    pcp->psc = psc;
+    pcp->driContext = 
+	(*core->createNewContext)(psc->__driScreen,
+				  config->driConfig, shared, pcp);
+    gc->__driContext = pcp->driContext;
+
+    if (pcp->driContext == NULL) {
+	Xfree(pcp);
+	return NULL;
+    }
+
+    pcp->base.destroyContext = dri2DestroyContext;
+    pcp->base.bindContext = dri2BindContext;
+    pcp->base.unbindContext = dri2UnbindContext;
+
+    return &pcp->base;
+}
+
+static void dri2DestroyDrawable(__GLXDRIdrawable *pdraw)
+{
+    const __DRIcoreExtension *core = pdraw->psc->core;
+
+    (*core->destroyDrawable)(pdraw->driDrawable);
+    DRI2DestroyDrawable(pdraw->psc->dpy, pdraw->drawable);
+    Xfree(pdraw);
+}
+
+static __GLXDRIdrawable *dri2CreateDrawable(__GLXscreenConfigs *psc,
+					    XID xDrawable,
+					    GLXDrawable drawable,
+					    const __GLcontextModes *modes)
+{
+    __GLXDRIdrawable *pdraw;
+    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) modes;
+    unsigned int handle, head;
+    const __DRIcoreExtension *core = psc->core;
+
+    pdraw = Xmalloc(sizeof(*pdraw));
+    if (!pdraw)
+	return NULL;
+
+    pdraw->destroyDrawable = dri2DestroyDrawable;
+    pdraw->xDrawable = xDrawable;
+    pdraw->drawable = drawable;
+    pdraw->psc = psc;
+
+    fprintf(stderr, "calling DRI2CreateDrawable, XID 0x%lx, GLX ID 0x%lx\n",
+	    xDrawable, drawable);
+
+    if (!DRI2CreateDrawable(psc->dpy, xDrawable, &handle, &head)) {
+	Xfree(pdraw);
+	return NULL;
+    }
+
+    fprintf(stderr, "success, head 0x%x, handle 0x%x\n", head, handle);
+
+    /* Create a new drawable */
+    pdraw->driDrawable =
+	(*core->createNewDrawable)(psc->__driScreen,
+				   config->driConfig,
+				   handle,
+				   head,
+				   pdraw);
+
+    if (!pdraw->driDrawable) {
+	DRI2DestroyDrawable(psc->dpy, drawable);
+	Xfree(pdraw);
+	return NULL;
+    }
+
+    return pdraw;
+}
+
+static void dri2DestroyScreen(__GLXscreenConfigs *psc)
+{
+    /* Free the direct rendering per screen data */
+    (*psc->core->destroyScreen)(psc->__driScreen);
+    drmClose(psc->fd);
+    psc->__driScreen = NULL;
+}
+
+
+static void dri2ReemitDrawableInfo(__DRIdrawable *draw, unsigned int *tail,
+				    void *loaderPrivate)
+{
+    __GLXDRIdrawable *pdraw = loaderPrivate;
+
+    DRI2ReemitDrawableInfo(pdraw->psc->dpy, pdraw->drawable, tail);
+}
+
+static void dri2PostDamage(__DRIdrawable *draw,
+			   struct drm_clip_rect *rects,
+			   int numRects, void *loaderPrivate)
+{ 
+    XRectangle *xrects;
+    XserverRegion region;
+    __GLXDRIdrawable *glxDraw = loaderPrivate;
+    __GLXscreenConfigs *psc = glxDraw->psc;
+    Display *dpy = psc->dpy;
+    int i;
+
+    xrects = malloc(sizeof(XRectangle) * numRects);
+    if (xrects == NULL)
+	return;
+
+    for (i = 0; i < numRects; i++) {
+	xrects[i].x = rects[i].x1;
+	xrects[i].y = rects[i].y1;
+	xrects[i].width = rects[i].x2 - rects[i].x1;
+	xrects[i].height = rects[i].y2 - rects[i].y1;
+    }
+    region = XFixesCreateRegion(dpy, xrects, numRects);
+    free(xrects);
+    XDamageAdd(dpy, glxDraw->xDrawable, region);
+    XFixesDestroyRegion(dpy, region);
+}
+
+static const __DRIloaderExtension dri2LoaderExtension = {
+    { __DRI_LOADER, __DRI_LOADER_VERSION },
+    dri2ReemitDrawableInfo,
+    dri2PostDamage
+};
+
+_X_HIDDEN const __DRIsystemTimeExtension systemTimeExtension;
+
+static const __DRIextension *loader_extensions[] = {
+    &dri2LoaderExtension.base,
+    &systemTimeExtension.base,
+    NULL
+};
+
+/* We need a dri_common.h type-of-thing. */
+
+extern void ErrorMessageF(const char *f, ...);
+
+extern void *driOpenDriver(const char *driverName);
+
+extern __GLcontextModes *
+driConvertConfigs(const __DRIcoreExtension *core,
+		  __GLcontextModes *modes, const __DRIconfig **configs);
+
+extern void driBindExtensions(__GLXscreenConfigs *psc);
+
+void
+driBindExtensions(__GLXscreenConfigs *psc)
+{
+    const __DRIextension **extensions;
+    int i;
+
+    extensions = psc->core->getExtensions(psc->__driScreen);
+
+    for (i = 0; extensions[i]; i++) {
+#ifdef __DRI_COPY_SUB_BUFFER
+	if (strcmp(extensions[i]->name, __DRI_COPY_SUB_BUFFER) == 0) {
+	    psc->copySubBuffer = (__DRIcopySubBufferExtension *) extensions[i];
+	    __glXEnableDirectExtension(psc, "GLX_MESA_copy_sub_buffer_bit");
+	}
+#endif
+
+#ifdef __DRI_SWAP_CONTROL
+	if (strcmp(extensions[i]->name, __DRI_SWAP_CONTROL) == 0) {
+	    psc->swapControl = (__DRIswapControlExtension *) extensions[i];
+	    __glXEnableDirectExtension(psc, "GLX_SGI_swap_control");
+	    __glXEnableDirectExtension(psc, "GLX_MESA_swap_control");
+	}
+#endif
+
+#ifdef __DRI_ALLOCATE
+	if (strcmp(extensions[i]->name, __DRI_ALLOCATE) == 0) {
+	    psc->allocate = (__DRIallocateExtension *) extensions[i];
+	    __glXEnableDirectExtension(psc, "GLX_MESA_allocate_memory");
+	}
+#endif
+
+#ifdef __DRI_FRAME_TRACKING
+	if (strcmp(extensions[i]->name, __DRI_FRAME_TRACKING) == 0) {
+	    psc->frameTracking = (__DRIframeTrackingExtension *) extensions[i];
+	    __glXEnableDirectExtension(psc, "GLX_MESA_swap_frame_usage");
+	}
+#endif
+
+#ifdef __DRI_MEDIA_STREAM_COUNTER
+	if (strcmp(extensions[i]->name, __DRI_MEDIA_STREAM_COUNTER) == 0) {
+	    psc->msc = (__DRImediaStreamCounterExtension *) extensions[i];
+	    __glXEnableDirectExtension(psc, "GLX_SGI_video_sync");
+	}
+#endif
+
+#ifdef __DRI_SWAP_BUFFER_COUNTER
+	/* No driver supports this at this time and the extension is
+	 * not defined in dri_interface.h.  Will enable
+	 * GLX_OML_sync_control if implemented. */
+#endif
+
+#ifdef __DRI_READ_DRAWABLE
+	if (strcmp(extensions[i]->name, __DRI_READ_DRAWABLE) == 0) {
+	    __glXEnableDirectExtension(psc, "GLX_SGI_make_current_read");
+	}
+#endif
+
+#ifdef __DRI_TEX_BUFFER
+	if (strcmp(extensions[i]->name, __DRI_TEX_BUFFER) == 0) {
+	    psc->texBuffer = (__DRItexBufferExtension *) extensions[i];
+	    __glXEnableDirectExtension(psc, "GLX_EXT_texture_from_pixmap");
+	}
+#endif
+
+	/* Ignore unknown extensions */
+    }
+}
+
+static __GLXDRIscreen *dri2CreateScreen(__GLXscreenConfigs *psc, int screen,
+					__GLXdisplayPrivate *priv)
+{
+    const __DRIconfig **driver_configs;
+    const __DRIextension **extensions;
+    __GLXDRIscreen *psp;
+    unsigned int sareaHandle;
+    char *driverName, *busID;
+    drm_magic_t magic;
+    int i;
+
+    psp = Xmalloc(sizeof *psp);
+    if (psp == NULL)
+	return NULL;
+
+    /* Initialize per screen dynamic client GLX extensions */
+    psc->ext_list_first_time = GL_TRUE;
+
+    if (!DRI2Connect(psc->dpy, screen, &driverName, &busID, &sareaHandle))
+	return NULL;
+
+    psc->driver = driOpenDriver(driverName);
+    if (psc->driver == NULL)
+	goto handle_error;
+
+    extensions = dlsym(psc->driver, __DRI_DRIVER_EXTENSIONS);
+    if (extensions == NULL) {
+	ErrorMessageF("driver exports no extensions (%s)\n", dlerror());
+	goto handle_error;
+    }
+    
+    for (i = 0; extensions[i]; i++) {
+	if (strcmp(extensions[i]->name, __DRI_CORE) == 0)
+	    psc->core = (__DRIcoreExtension *) extensions[i];
+    }
+
+    if (psc->core == NULL) {
+	ErrorMessageF("core dri extension not found\n");
+	goto handle_error;
+    }
+
+    psc->fd = drmOpen(NULL, busID);
+    if (psc->fd < 0) {
+	ErrorMessageF("failed to open drm device: %s\n", strerror(errno));
+	return NULL;
+    }
+
+    if (drmGetMagic(psc->fd, &magic))
+	return NULL;
+
+    if (!DRI2AuthConnection(psc->dpy, screen, magic)) {
+	ErrorMessageF("failed to authenticate drm access\n");
+	return NULL;
+    }
+
+    psc->__driScreen = 
+	psc->core->createNewScreen(screen, psc->fd, sareaHandle,
+				   loader_extensions, &driver_configs, psc);
+    if (psc->__driScreen == NULL) {
+	ErrorMessageF("failed to create dri screen\n");
+	return NULL;
+    }
+
+    driBindExtensions(psc);
+
+    psc->configs = driConvertConfigs(psc->core, psc->configs, driver_configs);
+    psc->visuals = driConvertConfigs(psc->core, psc->visuals, driver_configs);
+
+    psp->destroyScreen = dri2DestroyScreen;
+    psp->createContext = dri2CreateContext;
+    psp->createDrawable = dri2CreateDrawable;
+
+    Xfree(driverName);
+    Xfree(busID);
+
+    return psp;
+
+ handle_error:
+    Xfree(driverName);
+    Xfree(busID);
+
+    /* FIXME: clean up here */
+
+    return NULL;
+}
+
+/* Called from __glXFreeDisplayPrivate.
+ */
+static void dri2DestroyDisplay(__GLXDRIdisplay *dpy)
+{
+    Xfree(dpy);
+}
+
+/*
+ * Allocate, initialize and return a __DRIdisplayPrivate object.
+ * This is called from __glXInitialize() when we are given a new
+ * display pointer.
+ */
+_X_HIDDEN __GLXDRIdisplay *dri2CreateDisplay(Display *dpy)
+{
+    __GLXDRIdisplayPrivate *pdp;
+    int eventBase, errorBase;
+
+    if (!DRI2QueryExtension(dpy, &eventBase, &errorBase))
+	return NULL;
+
+    pdp = Xmalloc(sizeof *pdp);
+    if (pdp == NULL)
+	return NULL;
+
+    if (!DRI2QueryVersion(dpy, &pdp->driMajor, &pdp->driMinor)) {
+	Xfree(pdp);
+	return NULL;
+    }
+
+    pdp->driPatch = 0;
+
+    pdp->base.destroyDisplay = dri2DestroyDisplay;
+    pdp->base.createScreen = dri2CreateScreen;
+
+    return &pdp->base;
+}
+
+#endif /* GLX_DIRECT_RENDERING */