Add reporting of damage by DRI drivers when the extension support is available.

With this, tools like ximagesrc in gstreamer correctly see updates from GL
rendering.  Support requires that the Xdamage library be current (but will be
disabled if not present) plus a new X Server with support for the new
XDamagePost request.  libGL now has a new interface version, and also links
against libXdamage and libXfixes to support it, but backwards compatibility
is retained.

Currently, all drivers report damage at SwapBuffers time through common code --
front buffer rendering doesn't result in damage being reported.  Also, the
damage is against the root window, as our drivers don't yet render to backing
store when they should (composited environments).

6 files changed, 112 insertions, 4 deletions

diff --git a/configs/freebsd-dri b/configs/freebsd-dri
index 68877c612e7..1492e4a4d9b 100644
--- a/configs/freebsd-dri
+++ b/configs/freebsd-dri
@@ -28,7 +28,8 @@ ASM_SOURCES =
 LIBDRM_CFLAGS = `pkg-config --cflags libdrm`
 LIBDRM_LIB = `pkg-config --libs libdrm`
 DRI_LIB_DEPS = -L/usr/local/lib -lm -lpthread -lexpat $(LIBDRM_LIB)
-GL_LIB_DEPS = -L/usr/X11R6/lib -lX11 -lXext -lXxf86vm -lm -lpthread $(LIBDRM_LIB)
+GL_LIB_DEPS = -L/usr/X11R6/lib -lX11 -lXext -lXxf86vm -lXdamage -lXfixes \
+	-lm -lpthread $(LIBDRM_LIB)
 
 GLUT_LIB_DEPS = -L$(TOP)/$(LIB_DIR) -L/usr/X11R6/lib -lGLU -lGL -lX11 -lXmu -lXt -lXi -lm
 GLW_LIB_DEPS = -L$(TOP)/$(LIB_DIR) -L/usr/X11R6/lib -lGL -lXt -lX11
diff --git a/configs/linux-dri b/configs/linux-dri
index 7e822e2eb61..5f945a73f1a 100644
--- a/configs/linux-dri
+++ b/configs/linux-dri
@@ -41,7 +41,8 @@ EXTRA_LIB_PATH=-L/usr/X11R6/lib
 LIBDRM_CFLAGS = `pkg-config --cflags libdrm`
 LIBDRM_LIB = `pkg-config --libs libdrm`
 DRI_LIB_DEPS  = $(EXTRA_LIB_PATH) -lm -lpthread -lexpat -ldl $(LIBDRM_LIB)
-GL_LIB_DEPS   = $(EXTRA_LIB_PATH) -lX11 -lXext -lXxf86vm -lm -lpthread -ldl \
+GL_LIB_DEPS   = $(EXTRA_LIB_PATH) -lX11 -lXext -lXxf86vm -lXdamage -lXfixes \
+		-lm -lpthread -ldl \
                 $(LIBDRM_LIB)
 
 
diff --git a/include/GL/internal/dri_interface.h b/include/GL/internal/dri_interface.h
index c204ecfe622..a3de2c6aab3 100644
--- a/include/GL/internal/dri_interface.h
+++ b/include/GL/internal/dri_interface.h
@@ -237,6 +237,26 @@ struct __DRIinterfaceMethodsRec {
     GLboolean (*getMSCRate)(__DRInativeDisplay * dpy, __DRIid drawable,
         int32_t * numerator, int32_t * denominator);
     /*@}*/
+
+    /**
+     * Reports areas of the given drawable which have been modified by the
+     * driver.
+     *
+     * \param drawable which the drawing was done to.
+     * \param rects rectangles affected, with the drawable origin as the
+     *	      origin.
+     * \param x X offset of the drawable within the screen (used in the
+     *	      front_buffer case)
+     * \param y Y offset of the drawable within the screen.
+     * \param front_buffer boolean flag for whether the drawing to the
+     * 	      drawable was actually done directly to the front buffer (instead
+     *	      of backing storage, for example)
+     */
+    void (*reportDamage)(__DRInativeDisplay * dpy, int screen,
+			 __DRIid drawable,
+			 int x, int y,
+			 drm_clip_rect_t *rects, int num_rects,
+			 int front_buffer);
 };
 
    
diff --git a/src/glx/x11/glxcmds.c b/src/glx/x11/glxcmds.c
index 9d1bb2a0b55..f52b71ffcd2 100644
--- a/src/glx/x11/glxcmds.c
+++ b/src/glx/x11/glxcmds.c
@@ -2883,8 +2883,9 @@ int __glXGetInternalVersion(void)
      * 20050727 - Gut all the old interfaces.  This breaks compatability with
      *            any DRI driver built to any previous version.
      * 20060314 - Added support for GLX_MESA_copy_sub_buffer.
+     * 20070105 - Added support for damage reporting.
      */
-    return 20060314;
+    return 20070105;
 }
 
 
diff --git a/src/glx/x11/glxext.c b/src/glx/x11/glxext.c
index 8bec2c34c60..29b3a1c01c5 100644
--- a/src/glx/x11/glxext.c
+++ b/src/glx/x11/glxext.c
@@ -48,6 +48,8 @@
 #include <stdio.h>
 #include <X11/extensions/Xext.h>
 #include <X11/extensions/extutil.h>
+#include <X11/extensions/Xfixes.h>
+#include <X11/extensions/Xdamage.h>
 #include <assert.h>
 #include "indirect_init.h"
 #include "glapi.h"
@@ -698,6 +700,68 @@ static __DRIfuncPtr get_proc_address( const char * proc_name )
     return NULL;
 }
 
+#ifdef XDAMAGE_1_1_INTERFACE
+static GLboolean has_damage_post(__DRInativeDisplay *dpy)
+{
+    static GLboolean inited = GL_FALSE;
+    static GLboolean has_damage;
+
+    if (!inited) {
+	int major, minor;
+
+	if (XDamageQueryVersion(dpy, &major, &minor) &&
+	    major == 1 && minor >= 1)
+	{
+	    has_damage = GL_TRUE;
+	} else {
+	    has_damage = GL_FALSE;
+	}
+	inited = GL_TRUE;
+    }
+
+    return has_damage;
+}
+#endif /* XDAMAGE_1_1_INTERFACE */
+
+static void __glXReportDamage(__DRInativeDisplay *dpy, int screen,
+			      __DRIid drawable,
+			      int x, int y,
+			      drm_clip_rect_t *rects, int num_rects,
+			      GLboolean front_buffer)
+{
+#ifdef XDAMAGE_1_1_INTERFACE
+    XRectangle *xrects;
+    XserverRegion region;
+    int i;
+    int x_off, y_off;
+
+    if (!has_damage_post(dpy))
+	return;
+
+    if (front_buffer) {
+	x_off = x;
+	y_off = y;
+	drawable = RootWindow(dpy, screen);
+    } else{
+	x_off = 0;
+	y_off = 0;
+    }
+
+    xrects = malloc(sizeof(XRectangle) * num_rects);
+    if (xrects == NULL)
+	return;
+
+    for (i = 0; i < num_rects; i++) {
+	xrects[i].x = rects[i].x1 + x_off;
+	xrects[i].y = rects[i].y1 + y_off;
+	xrects[i].width = rects[i].x2 - rects[i].x1;
+	xrects[i].height = rects[i].y2 - rects[i].y1;
+    }
+    region = XFixesCreateRegion(dpy, xrects, num_rects);
+    XDamagePost(dpy, drawable, region);
+    XFixesDestroyRegion(dpy, region);
+#endif
+}
 
 /**
  * Table of functions exported by the loader to the driver.
@@ -720,6 +784,8 @@ static const __DRIinterfaceMethods interface_methods = {
 
     __glXGetUST,
     __glXGetMscRateOML,
+
+    __glXReportDamage,
 };
 
 
diff --git a/src/mesa/drivers/dri/common/dri_util.c b/src/mesa/drivers/dri/common/dri_util.c
index ba251a81430..cc3dcf9d8db 100644
--- a/src/mesa/drivers/dri/common/dri_util.c
+++ b/src/mesa/drivers/dri/common/dri_util.c
@@ -482,8 +482,27 @@ __driUtilUpdateDrawableInfo(__DRIdrawablePrivate *pdp)
 static void driSwapBuffers( __DRInativeDisplay *dpy, void *drawablePrivate )
 {
     __DRIdrawablePrivate *dPriv = (__DRIdrawablePrivate *) drawablePrivate;
+    drm_clip_rect_t rect;
+
     dPriv->swapBuffers(dPriv);
-    (void) dpy;
+
+    /* Check that we actually have the new damage report method */
+    if (api_ver < 20070105 || dri_interface->reportDamage == NULL)
+	return;
+
+    /* Assume it's affecting the whole drawable for now */
+    rect.x1 = 0;
+    rect.y1 = 0;
+    rect.x2 = rect.x1 + dPriv->w;
+    rect.y2 = rect.y1 + dPriv->h;
+
+    /* Report the damage.  Currently, all our drivers draw directly to the
+     * front buffer, so we report the damage there rather than to the backing
+     * store (if any).
+     */
+    (*dri_interface->reportDamage)(dpy, dPriv->screen, dPriv->draw,
+				   dPriv->x, dPriv->y,
+				   &rect, 1, GL_TRUE);
 }
 
 /**