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glx: Depend on libdrm

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DRM is available on more platforms than Linux (e.g. kFreeBSD), but
Clutter currently FTBFS there because of not being an alternative to
the __linux__ code (where it should be HAVE_DRM).

Instead of copying the DRM data structures, we should use libdrm when
falling back to directly requesting to wait for the vblank.

http://bugzilla.clutter-project.org/show_bug.cgi?id=2225

Based on a patch by: Emilio Pozuelo Monfort <pochu27@gmail.com>
Signed-off-by: Emmanuele Bassi <ebassi@linux.intel.com>
This commit is contained in:
Emmanuele Bassi 2010-08-09 11:29:03 +01:00
parent 28378f1bb4
commit 1943b8e544
2 changed files with 19 additions and 32 deletions
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43
clutter/glx/clutter-stage-glx.c
View File

@ -53,32 +53,9 @@
#include <fcntl.h>
#include <errno.h>
#ifdef __linux__
#define DRM_VBLANK_RELATIVE 0x1;
struct drm_wait_vblank_request {
int type;
unsigned int sequence;
unsigned long signal;
};
struct drm_wait_vblank_reply {
int type;
unsigned int sequence;
long tval_sec;
long tval_usec;
};
typedef union drm_wait_vblank {
struct drm_wait_vblank_request request;
struct drm_wait_vblank_reply reply;
} drm_wait_vblank_t;
#define DRM_IOCTL_BASE 'd'
#define DRM_IOWR(nr,type) _IOWR(DRM_IOCTL_BASE,nr,type)
#define DRM_IOCTL_WAIT_VBLANK DRM_IOWR(0x3a, drm_wait_vblank_t)
#endif /* __linux__ */
#ifdef HAVE_DRM
#include <drm.h>
#endif
static void clutter_stage_window_iface_init (ClutterStageWindowIface *iface);
@ -462,7 +439,7 @@ clutter_stage_window_iface_init (ClutterStageWindowIface *iface)
/* the rest is inherited from ClutterStageX11 */
}
#ifdef __linux__
#ifdef HAVE_DRM
static int
drm_wait_vblank(int fd, drm_wait_vblank_t *vbl)
{
@ -471,14 +448,14 @@ drm_wait_vblank(int fd, drm_wait_vblank_t *vbl)
do
{
ret = ioctl(fd, DRM_IOCTL_WAIT_VBLANK, vbl);
vbl->request.type &= ~DRM_VBLANK_RELATIVE;
vbl->request.type &= ~_DRM_VBLANK_RELATIVE;
rc = errno;
}
while (ret && rc == EINTR);
return rc;
}
#endif /* __linux__ */
#endif /* HAVE_DRM */
static void
wait_for_vblank (ClutterBackendGLX *backend_glx)
@ -496,18 +473,20 @@ wait_for_vblank (ClutterBackendGLX *backend_glx)
(retraceCount + 1) % 2,
&retraceCount);
}
#ifdef __linux__
else
{
#ifdef HAVE_DRM
drm_wait_vblank_t blank;
CLUTTER_NOTE (BACKEND, "Waiting for vblank (drm)");
blank.request.type = DRM_VBLANK_RELATIVE;
blank.request.type = _DRM_VBLANK_RELATIVE;
blank.request.sequence = 1;
blank.request.signal = 0;
drm_wait_vblank (backend_glx->dri_fd, &blank);
#else
CLUTTER_NOTE (BACKEND, "No vblank mechanism found");
#endif /* HAVE_DRM */
}
#endif
}
void

8
configure.ac
View File

@ -180,6 +180,14 @@ AS_CASE([$CLUTTER_FLAVOUR],
# if a pkg-config file isn't found just add -lGL
# and hope for the best.
[FLAVOUR_LIBS="$FLAVOUR_LIBS -lGL"])
# We might fall back to DRM for sync-to-vblank on GLX
PKG_CHECK_EXISTS([libdrm],
[
AC_DEFINE([HAVE_DRM], [1], [Have libdrm support])
BACKEND_PC_FILES="$BACKEND_PC_FILES libdrm"
],
[])
],
[opengl-egl-xlib],