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-rw-r--r--src/gallium/state_trackers/dri/common/dri_drawable.c126
-rw-r--r--src/gallium/state_trackers/dri/common/dri_drawable.h12
2 files changed, 136 insertions, 2 deletions
diff --git a/src/gallium/state_trackers/dri/common/dri_drawable.c b/src/gallium/state_trackers/dri/common/dri_drawable.c
index 7b8de3174be..ca9e1307db9 100644
--- a/src/gallium/state_trackers/dri/common/dri_drawable.c
+++ b/src/gallium/state_trackers/dri/common/dri_drawable.c
@@ -37,7 +37,9 @@
#include "util/u_format.h"
#include "util/u_memory.h"
#include "util/u_inlines.h"
-
+
+static void
+swap_fences_unref(struct dri_drawable *draw);
static boolean
dri_st_framebuffer_validate(struct st_framebuffer_iface *stfbi,
@@ -135,6 +137,8 @@ dri_create_buffer(__DRIscreen * sPriv,
drawable->screen = screen;
drawable->sPriv = sPriv;
drawable->dPriv = dPriv;
+ drawable->desired_fences = 2;
+
dPriv->driverPrivate = (void *)drawable;
p_atomic_set(&drawable->base.stamp, 1);
@@ -155,6 +159,8 @@ dri_destroy_buffer(__DRIdrawable * dPriv)
for (i = 0; i < ST_ATTACHMENT_COUNT; i++)
pipe_resource_reference(&drawable->textures[i], NULL);
+ swap_fences_unref(drawable);
+
FREE(drawable);
}
@@ -266,4 +272,122 @@ dri_drawable_get_format(struct dri_drawable *drawable,
}
}
+
+/**
+ * swap_fences_pop_front - pull a fence from the throttle queue
+ *
+ * If the throttle queue is filled to the desired number of fences,
+ * pull fences off the queue until the number is less than the desired
+ * number of fences, and return the last fence pulled.
+ */
+static struct pipe_fence_handle *
+swap_fences_pop_front(struct dri_drawable *draw)
+{
+ struct pipe_screen *screen = draw->screen->base.screen;
+ struct pipe_fence_handle *fence = NULL;
+
+ if (draw->desired_fences == 0)
+ return NULL;
+
+ if (draw->cur_fences >= draw->desired_fences) {
+ screen->fence_reference(screen, &fence, draw->swap_fences[draw->tail]);
+ screen->fence_reference(screen, &draw->swap_fences[draw->tail++], NULL);
+ draw->tail &= DRI_SWAP_FENCES_MASK;
+ --draw->cur_fences;
+ }
+ return fence;
+}
+
+
+/**
+ * swap_fences_push_back - push a fence onto the throttle queue
+ *
+ * push a fence onto the throttle queue and pull fences of the queue
+ * so that the desired number of fences are on the queue.
+ */
+static void
+swap_fences_push_back(struct dri_drawable *draw,
+ struct pipe_fence_handle *fence)
+{
+ struct pipe_screen *screen = draw->screen->base.screen;
+
+ if (!fence || draw->desired_fences == 0)
+ return;
+
+ while(draw->cur_fences == draw->desired_fences)
+ swap_fences_pop_front(draw);
+
+ draw->cur_fences++;
+ screen->fence_reference(screen, &draw->swap_fences[draw->head++],
+ fence);
+ draw->head &= DRI_SWAP_FENCES_MASK;
+}
+
+
+/**
+ * swap_fences_unref - empty the throttle queue
+ *
+ * pulls fences of the throttle queue until it is empty.
+ */
+static void
+swap_fences_unref(struct dri_drawable *draw)
+{
+ struct pipe_screen *screen = draw->screen->base.screen;
+
+ while(draw->cur_fences) {
+ screen->fence_reference(screen, &draw->swap_fences[draw->tail++], NULL);
+ draw->tail &= DRI_SWAP_FENCES_MASK;
+ --draw->cur_fences;
+ }
+}
+
+
+/**
+ * dri_throttle - A DRI2ThrottleExtension throttling function.
+ *
+ * pulls a fence off the throttling queue and waits for it if the
+ * number of fences on the throttling queue has reached the desired
+ * number.
+ *
+ * Then flushes to insert a fence at the current rendering position, and
+ * pushes that fence on the queue. This requires that the st_context_iface
+ * flush method returns a fence even if there are no commands to flush.
+ */
+static void
+dri_throttle(__DRIcontext *driCtx, __DRIdrawable *dPriv,
+ enum __DRI2throttleReason reason)
+{
+ struct dri_drawable *draw = dri_drawable(dPriv);
+ struct st_context_iface *ctxi;
+ struct pipe_screen *screen = draw->screen->base.screen;
+ struct pipe_fence_handle *fence;
+
+ if (reason != __DRI2_THROTTLE_SWAPBUFFER &&
+ reason != __DRI2_THROTTLE_FLUSHFRONT)
+ return;
+
+ fence = swap_fences_pop_front(draw);
+ if (fence) {
+ (void) screen->fence_finish(screen, fence, PIPE_TIMEOUT_INFINITE);
+ screen->fence_reference(screen, &fence, NULL);
+ }
+
+ if (driCtx == NULL)
+ return;
+
+ ctxi = dri_context(driCtx)->st;
+ ctxi->flush(ctxi, 0, &fence);
+ if (fence) {
+ swap_fences_push_back(draw, fence);
+ screen->fence_reference(screen, &fence, NULL);
+ }
+}
+
+
+const __DRI2throttleExtension dri2ThrottleExtension = {
+ .base = { __DRI2_THROTTLE, __DRI2_THROTTLE_VERSION },
+ .throttle = dri_throttle,
+};
+
+
/* vim: set sw=3 ts=8 sts=3 expandtab: */
diff --git a/src/gallium/state_trackers/dri/common/dri_drawable.h b/src/gallium/state_trackers/dri/common/dri_drawable.h
index fd3460dd30b..007421ebe18 100644
--- a/src/gallium/state_trackers/dri/common/dri_drawable.h
+++ b/src/gallium/state_trackers/dri/common/dri_drawable.h
@@ -36,6 +36,10 @@ struct pipe_surface;
struct st_framebuffer;
struct dri_context;
+#define DRI_SWAP_FENCES_MAX 4
+#define DRI_SWAP_FENCES_MASK 3
+#define DRI_SWAP_FENCES_DEFAULT 1
+
struct dri_drawable
{
struct st_framebuffer_iface base;
@@ -55,6 +59,12 @@ struct dri_drawable
struct pipe_resource *textures[ST_ATTACHMENT_COUNT];
unsigned int texture_mask, texture_stamp;
+ struct pipe_fence_handle *swap_fences[DRI_SWAP_FENCES_MAX];
+ unsigned int cur_fences;
+ unsigned int head;
+ unsigned int tail;
+ unsigned int desired_fences;
+
/* used only by DRISW */
struct pipe_surface *drisw_surface;
@@ -93,7 +103,7 @@ dri_drawable_get_format(struct dri_drawable *drawable,
unsigned *bind);
extern const __DRItexBufferExtension driTexBufferExtension;
-
+extern const __DRI2throttleExtension dri2ThrottleExtension;
#endif
/* vim: set sw=3 ts=8 sts=3 expandtab: */