llvmpipe: ditch additional ref counting for vertex/geometry sampler views

The cleaning up was quite a performance hog (making pipe_resource_reference
the number two in profilers on the vertex path, and 3rd overall, with its
cousin pipe_reference_described not far behind) if there were lots
of tiny draw calls (ipers). Now the reason was really that it was blindly
calling this for all potential shader views (so 32 each for vs and gs) even
though the app never touched a single one which could have been fixed,
however I can't come up with a good reason why we refcount these. We've got
references, of course, in the sampler views, which should be quite sufficient
as we do all vertex and geometry shader execution fully synchronous.
(Calling prepare_shader_sampling for all draw calls even if there were no
changes looks quite suboptimal too, but generally we don't really expect vs/gs
shader sampling to be used much with llvmpipe, and there's even an early exit
if there aren't any views to avoid the "null loop" albeit it's now no longer
always trying to loop through all 32 slots. Maybe improve another time...).
Of course, if we manage to make vertex loads run asynchronously some day,
we need references again, but adding that back would be the least of the
problems...
Also only set LP_NEW_SAMPLER_VIEW for fragment sampler views. Nothing on the
vertex side depends on it (I suppose we'd really wanted a separate flag in
any case).
(Good for a 3% improvement or so in ipers under the right conditions.)

Reviewed-by: Jose Fonseca <[email protected]>

1 files changed, 12 insertions, 35 deletions

diff --git a/src/gallium/drivers/llvmpipe/lp_state_sampler.c b/src/gallium/drivers/llvmpipe/lp_state_sampler.c
index 1e055878f7c..69af38e92c0 100644
--- a/src/gallium/drivers/llvmpipe/lp_state_sampler.c
+++ b/src/gallium/drivers/llvmpipe/lp_state_sampler.c
@@ -98,8 +98,9 @@ llvmpipe_bind_sampler_states(struct pipe_context *pipe,
                         llvmpipe->samplers[shader],
                         llvmpipe->num_samplers[shader]);
    }
-
-   llvmpipe->dirty |= LP_NEW_SAMPLER;
+   else {
+      llvmpipe->dirty |= LP_NEW_SAMPLER;
+   }
 }
 
 
@@ -146,8 +147,9 @@ llvmpipe_set_sampler_views(struct pipe_context *pipe,
                              llvmpipe->sampler_views[shader],
                              llvmpipe->num_sampler_views[shader]);
    }
-
-   llvmpipe->dirty |= LP_NEW_SAMPLER_VIEW;
+   else {
+      llvmpipe->dirty |= LP_NEW_SAMPLER_VIEW;
+   }
 }
 
 
@@ -228,8 +230,7 @@ prepare_shader_sampling(
    struct llvmpipe_context *lp,
    unsigned num,
    struct pipe_sampler_view **views,
-   unsigned shader_type,
-   struct pipe_resource *mapped_tex[PIPE_MAX_SHADER_SAMPLER_VIEWS])
+   unsigned shader_type)
 {
 
    unsigned i;
@@ -242,7 +243,7 @@ prepare_shader_sampling(
    if (!num)
       return;
 
-   for (i = 0; i < PIPE_MAX_SHADER_SAMPLER_VIEWS; i++) {
+   for (i = 0; i < num; i++) {
       struct pipe_sampler_view *view = i < num ? views[i] : NULL;
 
       if (view) {
@@ -253,11 +254,6 @@ prepare_shader_sampling(
          unsigned first_level = 0;
          unsigned last_level = 0;
 
-         /* We're referencing the texture's internal data, so save a
-          * reference to it.
-          */
-         pipe_resource_reference(&mapped_tex[i], tex);
-
          if (!lp_tex->dt) {
             /* regular texture - setup array of mipmap level offsets */
             struct pipe_resource *res = view->texture;
@@ -335,47 +331,28 @@ prepare_shader_sampling(
 
 
 /**
- * Called during state validation when LP_NEW_SAMPLER_VIEW is set.
+ * Called whenever we're about to draw (no dirty flag, FIXME?).
  */
 void
 llvmpipe_prepare_vertex_sampling(struct llvmpipe_context *lp,
                                  unsigned num,
                                  struct pipe_sampler_view **views)
 {
-   prepare_shader_sampling(lp, num, views, PIPE_SHADER_VERTEX,
-                           lp->mapped_vs_tex);
-}
-
-void
-llvmpipe_cleanup_vertex_sampling(struct llvmpipe_context *ctx)
-{
-   unsigned i;
-   for (i = 0; i < Elements(ctx->mapped_vs_tex); i++) {
-      pipe_resource_reference(&ctx->mapped_vs_tex[i], NULL);
-   }
+   prepare_shader_sampling(lp, num, views, PIPE_SHADER_VERTEX);
 }
 
 
 /**
- * Called during state validation when LP_NEW_SAMPLER_VIEW is set.
+ * Called whenever we're about to draw (no dirty flag, FIXME?).
  */
 void
 llvmpipe_prepare_geometry_sampling(struct llvmpipe_context *lp,
                                    unsigned num,
                                    struct pipe_sampler_view **views)
 {
-   prepare_shader_sampling(lp, num, views, PIPE_SHADER_GEOMETRY,
-                           lp->mapped_gs_tex);
+   prepare_shader_sampling(lp, num, views, PIPE_SHADER_GEOMETRY);
 }
 
-void
-llvmpipe_cleanup_geometry_sampling(struct llvmpipe_context *ctx)
-{
-   unsigned i;
-   for (i = 0; i < Elements(ctx->mapped_gs_tex); i++) {
-      pipe_resource_reference(&ctx->mapped_gs_tex[i], NULL);
-   }
-}
 
 void
 llvmpipe_init_sampler_funcs(struct llvmpipe_context *llvmpipe)