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-rw-r--r--src/egl/drivers/dri2/platform_android.c59
-rw-r--r--src/egl/main/Android.mk5
2 files changed, 64 insertions, 0 deletions
diff --git a/src/egl/drivers/dri2/platform_android.c b/src/egl/drivers/dri2/platform_android.c
index 15bf0548b5c..7ede48de69c 100644
--- a/src/egl/drivers/dri2/platform_android.c
+++ b/src/egl/drivers/dri2/platform_android.c
@@ -31,6 +31,10 @@
#include <errno.h>
#include <dlfcn.h>
+#if ANDROID_VERSION >= 0x402
+#include <sync/sync.h>
+#endif
+
/* for droid_get_pci_id */
#include <xf86drm.h>
#include <i915_drm.h>
@@ -79,11 +83,48 @@ get_native_buffer_name(struct ANativeWindowBuffer *buf)
static EGLBoolean
droid_window_dequeue_buffer(struct dri2_egl_surface *dri2_surf)
{
+#if ANDROID_VERSION >= 0x0402
+ int fence_fd;
+
+ if (dri2_surf->window->dequeueBuffer(dri2_surf->window, &dri2_surf->buffer,
+ &fence_fd))
+ return EGL_FALSE;
+
+ /* If access to the buffer is controlled by a sync fence, then block on the
+ * fence.
+ *
+ * It may be more performant to postpone blocking until there is an
+ * immediate need to write to the buffer. But doing so would require adding
+ * hooks to the DRI2 loader.
+ *
+ * From the ANativeWindow::dequeueBuffer documentation:
+ *
+ * The libsync fence file descriptor returned in the int pointed to by
+ * the fenceFd argument will refer to the fence that must signal
+ * before the dequeued buffer may be written to. A value of -1
+ * indicates that the caller may access the buffer immediately without
+ * waiting on a fence. If a valid file descriptor is returned (i.e.
+ * any value except -1) then the caller is responsible for closing the
+ * file descriptor.
+ */
+ if (fence_fd >= 0) {
+ /* From the SYNC_IOC_WAIT documentation in <linux/sync.h>:
+ *
+ * Waits indefinitely if timeout < 0.
+ */
+ int timeout = -1;
+ sync_wait(fence_fd, timeout);
+ close(fence_fd);
+ }
+
+ dri2_surf->buffer->common.incRef(&dri2_surf->buffer->common);
+#else
if (dri2_surf->window->dequeueBuffer(dri2_surf->window, &dri2_surf->buffer))
return EGL_FALSE;
dri2_surf->buffer->common.incRef(&dri2_surf->buffer->common);
dri2_surf->window->lockBuffer(dri2_surf->window, dri2_surf->buffer);
+#endif
return EGL_TRUE;
}
@@ -91,7 +132,25 @@ droid_window_dequeue_buffer(struct dri2_egl_surface *dri2_surf)
static EGLBoolean
droid_window_enqueue_buffer(struct dri2_egl_surface *dri2_surf)
{
+#if ANDROID_VERSION >= 0x0402
+ /* Queue the buffer without a sync fence. This informs the ANativeWindow
+ * that it may access the buffer immediately.
+ *
+ * From ANativeWindow::dequeueBuffer:
+ *
+ * The fenceFd argument specifies a libsync fence file descriptor for
+ * a fence that must signal before the buffer can be accessed. If
+ * the buffer can be accessed immediately then a value of -1 should
+ * be used. The caller must not use the file descriptor after it
+ * is passed to queueBuffer, and the ANativeWindow implementation
+ * is responsible for closing it.
+ */
+ int fence_fd = -1;
+ dri2_surf->window->queueBuffer(dri2_surf->window, dri2_surf->buffer,
+ fence_fd);
+#else
dri2_surf->window->queueBuffer(dri2_surf->window, dri2_surf->buffer);
+#endif
dri2_surf->buffer->common.decRef(&dri2_surf->buffer->common);
dri2_surf->buffer = NULL;
diff --git a/src/egl/main/Android.mk b/src/egl/main/Android.mk
index a4a00f3bb35..97e4860211a 100644
--- a/src/egl/main/Android.mk
+++ b/src/egl/main/Android.mk
@@ -79,7 +79,12 @@ LOCAL_STATIC_LIBRARIES += libmesa_egl_dri2
# require i915_dri and/or i965_dri
LOCAL_REQUIRED_MODULES += \
$(addsuffix _dri, $(filter i915 i965, $(MESA_GPU_DRIVERS)))
+
+ifeq ($(shell echo "$(MESA_ANDROID_VERSION) >= 4.2" | bc),1)
+ LOCAL_SHARED_LIBRARIES += \
+ libsync
endif
+endif # MESA_BUILD_CLASSIC
ifeq ($(strip $(MESA_BUILD_GALLIUM)),true)