[Mesa-dev] [PATCH 3/3] st/mesa: implement DrawTransformFeedbackStream

[Dave Airlie]

On 31 July 2015 at 00:26, Marek Olšák <maraeo at gmail.com> wrote:
> From: Marek Olšák <marek.olsak at amd.com>

once you rebase onto my last patch, these look fine.

Reviewed-by: Dave Airlie <airlied at redhat.com>
>
> ---
>  src/mesa/state_tracker/st_cb_xformfb.c | 58 ++++++++++++++++++----------------
>  src/mesa/state_tracker/st_cb_xformfb.h |  2 +-
>  src/mesa/state_tracker/st_draw.c       |  2 +-
>  3 files changed, 33 insertions(+), 29 deletions(-)
>
> diff --git a/src/mesa/state_tracker/st_cb_xformfb.c b/src/mesa/state_tracker/st_cb_xformfb.c
> index 07c118e..85a8620 100644
> --- a/src/mesa/state_tracker/st_cb_xformfb.c
> +++ b/src/mesa/state_tracker/st_cb_xformfb.c
> @@ -54,9 +54,9 @@ struct st_transform_feedback_object {
>     struct pipe_stream_output_target *targets[PIPE_MAX_SO_BUFFERS];
>
>     /* This encapsulates the count that can be used as a source for draw_vbo.
> -    * It contains a stream output target from the last call of
> -    * EndTransformFeedback. */
> -   struct pipe_stream_output_target *draw_count;
> +    * It contains stream output targets from the last call of
> +    * EndTransformFeedback for each stream. */
> +   struct pipe_stream_output_target *draw_count[MAX_VERTEX_STREAMS];
>  };
>
>  static inline struct st_transform_feedback_object *
> @@ -88,7 +88,8 @@ st_delete_transform_feedback(struct gl_context *ctx,
>           st_transform_feedback_object(obj);
>     unsigned i;
>
> -   pipe_so_target_reference(&sobj->draw_count, NULL);
> +   for (i = 0; i < ARRAY_SIZE(sobj->draw_count); i++)
> +      pipe_so_target_reference(&sobj->draw_count[i], NULL);
>
>     /* Unreference targets. */
>     for (i = 0; i < sobj->num_targets; i++) {
> @@ -123,9 +124,12 @@ st_begin_transform_feedback(struct gl_context *ctx, GLenum mode,
>        struct st_buffer_object *bo = st_buffer_object(sobj->base.Buffers[i]);
>
>        if (bo && bo->buffer) {
> +         unsigned stream =
> +            obj->shader_program->LinkedTransformFeedback.BufferStream[i];
> +
>           /* Check whether we need to recreate the target. */
>           if (!sobj->targets[i] ||
> -             sobj->targets[i] == sobj->draw_count ||
> +             sobj->targets[i] == sobj->draw_count[stream] ||
>               sobj->targets[i]->buffer != bo->buffer ||
>               sobj->targets[i]->buffer_offset != sobj->base.Offset[i] ||
>               sobj->targets[i]->buffer_size != sobj->base.Size[i]) {
> @@ -178,24 +182,6 @@ st_resume_transform_feedback(struct gl_context *ctx,
>  }
>
>
> -static struct pipe_stream_output_target *
> -st_transform_feedback_get_draw_target(struct gl_transform_feedback_object *obj)
> -{
> -   struct st_transform_feedback_object *sobj =
> -         st_transform_feedback_object(obj);
> -   unsigned i;
> -
> -   for (i = 0; i < ARRAY_SIZE(sobj->targets); i++) {
> -      if (sobj->targets[i]) {
> -         return sobj->targets[i];
> -      }
> -   }
> -
> -   assert(0);
> -   return NULL;
> -}
> -
> -
>  static void
>  st_end_transform_feedback(struct gl_context *ctx,
>                            struct gl_transform_feedback_object *obj)
> @@ -203,22 +189,40 @@ st_end_transform_feedback(struct gl_context *ctx,
>     struct st_context *st = st_context(ctx);
>     struct st_transform_feedback_object *sobj =
>           st_transform_feedback_object(obj);
> +   unsigned i;
>
>     cso_set_stream_outputs(st->cso_context, 0, NULL, NULL);
>
> -   pipe_so_target_reference(&sobj->draw_count,
> -                            st_transform_feedback_get_draw_target(obj));
> +   /* The next call to glDrawTransformFeedbackStream should use the vertex
> +    * count from the last call to glEndTransformFeedback.
> +    * Therefore, save the targets for each stream.
> +    *
> +    * NULL means the vertex counter is 0 (initial state).
> +    */
> +   for (i = 0; i < ARRAY_SIZE(sobj->draw_count); i++)
> +      pipe_so_target_reference(&sobj->draw_count[i], NULL);
> +
> +   for (i = 0; i < ARRAY_SIZE(sobj->targets); i++) {
> +      unsigned stream =
> +         obj->shader_program->LinkedTransformFeedback.BufferStream[i];
> +
> +      /* Is it not boudn or already set for this stream? */
> +      if (!sobj->targets[i] || sobj->draw_count[stream])
> +         continue;
> +
> +      pipe_so_target_reference(&sobj->draw_count[stream], sobj->targets[i]);
> +   }
>  }
>
>
>  void
>  st_transform_feedback_draw_init(struct gl_transform_feedback_object *obj,
> -                                struct pipe_draw_info *out)
> +                                unsigned stream, struct pipe_draw_info *out)
>  {
>     struct st_transform_feedback_object *sobj =
>           st_transform_feedback_object(obj);
>
> -   out->count_from_stream_output = sobj->draw_count;
> +   out->count_from_stream_output = sobj->draw_count[stream];
>  }
>
>
> diff --git a/src/mesa/state_tracker/st_cb_xformfb.h b/src/mesa/state_tracker/st_cb_xformfb.h
> index 998c418..16f5176 100644
> --- a/src/mesa/state_tracker/st_cb_xformfb.h
> +++ b/src/mesa/state_tracker/st_cb_xformfb.h
> @@ -40,7 +40,7 @@ st_init_xformfb_functions(struct dd_function_table *functions);
>
>  extern void
>  st_transform_feedback_draw_init(struct gl_transform_feedback_object *obj,
> -                                struct pipe_draw_info *out);
> +                                unsigned stream, struct pipe_draw_info *out);
>
>
>  #endif /* ST_CB_XFORMFB_H */
> diff --git a/src/mesa/state_tracker/st_draw.c b/src/mesa/state_tracker/st_draw.c
> index 78dd5f4..d8efb4e 100644
> --- a/src/mesa/state_tracker/st_draw.c
> +++ b/src/mesa/state_tracker/st_draw.c
> @@ -243,7 +243,7 @@ st_draw_vbo(struct gl_context *ctx,
>        /* Transform feedback drawing is always non-indexed. */
>        /* Set info.count_from_stream_output. */
>        if (tfb_vertcount) {
> -         st_transform_feedback_draw_init(tfb_vertcount, &info);
> +         st_transform_feedback_draw_init(tfb_vertcount, stream, &info);
>        }
>     }
>
> --
> 2.1.4
>
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