g3dvl: Rework the decoder interface part 2/5

Implement PIPE_CAP_NUM_BUFFERS_DESIRED giving the decoder control over
the number of buffers a state tracker should allocate.

Signed-off-by: Christian König <deathsimple@vodafone.de>
Reviewed-by: Younes Manton <younes.m@gmail.com>

2 files changed, 19 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/vl/vl_decoder.c b/src/gallium/auxiliary/vl/vl_decoder.c
index fac0335..b23827d 100644
--- a/src/gallium/auxiliary/vl/vl_decoder.c
+++ b/src/gallium/auxiliary/vl/vl_decoder.c
@@ -44,6 +44,19 @@ vl_profile_supported(struct pipe_screen *screen, enum pipe_video_profile profile
    }
 }
 
+unsigned
+vl_num_buffers_desired(struct pipe_screen *screen, enum pipe_video_profile profile)
+{
+   assert(screen);
+   switch (u_reduce_video_profile(profile)) {
+      case PIPE_VIDEO_CODEC_MPEG12:
+         return 4;
+
+      default:
+         return 1;
+   }
+}
+
 struct pipe_video_decoder *
 vl_create_decoder(struct pipe_context *pipe,
                   enum pipe_video_profile profile,
diff --git a/src/gallium/auxiliary/vl/vl_decoder.h b/src/gallium/auxiliary/vl/vl_decoder.h
index 0e9280d..fed529c 100644
--- a/src/gallium/auxiliary/vl/vl_decoder.h
+++ b/src/gallium/auxiliary/vl/vl_decoder.h
@@ -38,6 +38,12 @@ bool
 vl_profile_supported(struct pipe_screen *screen, enum pipe_video_profile profile);
 
 /**
+ * the desired number of buffers for optimal operation
+ */
+unsigned
+vl_num_buffers_desired(struct pipe_screen *screen, enum pipe_video_profile profile);
+
+/**
  * standard implementation of pipe->create_video_decoder
  */
 struct pipe_video_decoder *