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Diffstat (limited to 'src/gallium/drivers/llvmpipe/lp_fence.c')
-rw-r--r--src/gallium/drivers/llvmpipe/lp_fence.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_fence.c b/src/gallium/drivers/llvmpipe/lp_fence.c
index 525c117f316..75d8d2b8251 100644
--- a/src/gallium/drivers/llvmpipe/lp_fence.c
+++ b/src/gallium/drivers/llvmpipe/lp_fence.c
@@ -29,9 +29,19 @@
#include "pipe/p_screen.h"
#include "util/u_memory.h"
#include "util/u_inlines.h"
+#include "lp_debug.h"
#include "lp_fence.h"
+/**
+ * Create a new fence object.
+ *
+ * The rank will be the number of bins in the scene. Whenever a rendering
+ * thread hits a fence command, it'll increment the fence counter. When
+ * the counter == the rank, the fence is finished.
+ *
+ * \param rank the expected finished value of the fence counter.
+ */
struct lp_fence *
lp_fence_create(unsigned rank)
{
@@ -48,6 +58,7 @@ lp_fence_create(unsigned rank)
}
+/** Destroy a fence. Called when refcount hits zero. */
static void
lp_fence_destroy(struct lp_fence *fence)
{
@@ -57,6 +68,10 @@ lp_fence_destroy(struct lp_fence *fence)
}
+/**
+ * For reference counting.
+ * This is a Gallium API function.
+ */
static void
llvmpipe_fence_reference(struct pipe_screen *screen,
struct pipe_fence_handle **ptr,
@@ -71,6 +86,10 @@ llvmpipe_fence_reference(struct pipe_screen *screen,
}
+/**
+ * Has the fence been executed/finished?
+ * This is a Gallium API function.
+ */
static int
llvmpipe_fence_signalled(struct pipe_screen *screen,
struct pipe_fence_handle *fence,
@@ -82,6 +101,10 @@ llvmpipe_fence_signalled(struct pipe_screen *screen,
}
+/**
+ * Wait for the fence to finish.
+ * This is a Gallium API function.
+ */
static int
llvmpipe_fence_finish(struct pipe_screen *screen,
struct pipe_fence_handle *fence_handle,
@@ -99,6 +122,25 @@ llvmpipe_fence_finish(struct pipe_screen *screen,
}
+/**
+ * Called by the rendering threads to increment the fence counter.
+ * When the counter == the rank, the fence is finished.
+ */
+void
+lp_fence_signal(struct lp_fence *fence)
+{
+ pipe_mutex_lock(fence->mutex);
+
+ fence->count++;
+ assert(fence->count <= fence->rank);
+
+ LP_DBG(DEBUG_RAST, "%s count=%u rank=%u\n", __FUNCTION__,
+ fence->count, fence->rank);
+
+ pipe_condvar_signal(fence->signalled);
+
+ pipe_mutex_unlock(fence->mutex);
+}
void