diff options
Diffstat (limited to 'libdrm')
| -rw-r--r-- | libdrm/xf86drm.h | 19 | ||||
| -rw-r--r-- | libdrm/xf86drmMode.c | 43 |
2 files changed, 62 insertions, 0 deletions
diff --git a/libdrm/xf86drm.h b/libdrm/xf86drm.h index c1d173c4..2cb9c9e9 100644 --- a/libdrm/xf86drm.h +++ b/libdrm/xf86drm.h @@ -271,6 +271,7 @@ typedef struct _drmTextureRegion { typedef enum { DRM_VBLANK_ABSOLUTE = 0x0, /**< Wait for specific vblank sequence number */ DRM_VBLANK_RELATIVE = 0x1, /**< Wait for given number of vblanks */ + DRM_VBLANK_EVENT = 0x4000000, /**< Send event instead of blocking */ DRM_VBLANK_FLIP = 0x8000000, /**< Scheduled buffer swap should flip */ DRM_VBLANK_NEXTONMISS = 0x10000000, /**< If missed, wait for next vblank */ DRM_VBLANK_SECONDARY = 0x20000000, /**< Secondary display controller */ @@ -667,4 +668,22 @@ extern void drmMsg(const char *format, ...); extern int drmSetMaster(int fd); extern int drmDropMaster(int fd); +#define DRM_EVENT_CONTEXT_VERSION 1 + +typedef struct _drmEventContext { + + /* This struct is versioned so we can add more pointers if we + * add more events. */ + int version; + + void (*vblank_handler)(int fd, + unsigned int sequence, + unsigned int tv_sec, + unsigned int tv_usec, + void *user_data); + +} drmEventContext, *drmEventContextPtr; + +extern int drmHandleEvent(int fd, drmEventContextPtr evctx); + #endif diff --git a/libdrm/xf86drmMode.c b/libdrm/xf86drmMode.c index 88b4fe3a..6d85113a 100644 --- a/libdrm/xf86drmMode.c +++ b/libdrm/xf86drmMode.c @@ -46,6 +46,7 @@ #include <drm.h> #include <string.h> #include <dirent.h> +#include <unistd.h> #include <errno.h> #define U642VOID(x) ((void *)(unsigned long)(x)) @@ -667,3 +668,45 @@ int drmModeCrtcSetGamma(int fd, uint32_t crtc_id, uint32_t size, return 0; } + +int drmHandleEvent(int fd, drmEventContextPtr evctx) +{ + char buffer[1024]; + int len, i; + struct drm_event *e; + struct drm_event_vblank *vblank; + + /* The DRM read semantics guarantees that we always get only + * complete events. */ + + len = read(fd, buffer, sizeof buffer); + if (len == 0) + return 0; + if (len < sizeof *e) + return -1; + + i = 0; + while (i < len) { + e = (struct drm_event *) &buffer[i]; + switch (e->type) { + case DRM_EVENT_VBLANK: + if (evctx->version < 1 || + evctx->vblank_handler == NULL) + break; + vblank = (struct drm_event_vblank *) e; + evctx->vblank_handler(fd, + vblank->sequence, + vblank->tv_sec, + vblank->tv_usec, + U642VOID (vblank->user_data)); + break; + + default: + break; + } + i += e->length; + } + + return 0; +} + |