4 files changed, 6 insertions, 34 deletions

diff --git a/src/mesa/state_tracker/st_atom_constbuf.c b/src/mesa/state_tracker/st_atom_constbuf.c
index 497d33fc348..0a6b23aff3b 100644
--- a/src/mesa/state_tracker/st_atom_constbuf.c
+++ b/src/mesa/state_tracker/st_atom_constbuf.c
@@ -101,22 +101,9 @@ void st_upload_constants(struct st_context *st, struct gl_program *prog)
 
       _mesa_shader_write_subroutine_indices(st->ctx, stage);
 
-      /* We always need to get a new buffer, to keep the drivers simple and
-       * avoid gratuitous rendering synchronization.
-       * Let's use a user buffer to avoid an unnecessary copy.
-       */
-      if (!st->has_user_constbuf) {
-         cb.buffer = NULL;
-         cb.user_buffer = NULL;
-         u_upload_data(st->pipe->const_uploader, 0, paramBytes,
-                       st->ctx->Const.UniformBufferOffsetAlignment,
-                       params->ParameterValues, &cb.buffer_offset, &cb.buffer);
-         u_upload_unmap(st->pipe->const_uploader);
-      } else {
-         cb.buffer = NULL;
-         cb.user_buffer = params->ParameterValues;
-         cb.buffer_offset = 0;
-      }
+      cb.buffer = NULL;
+      cb.user_buffer = params->ParameterValues;
+      cb.buffer_offset = 0;
       cb.buffer_size = paramBytes;
 
       if (ST_DEBUG & DEBUG_CONSTANTS) {
diff --git a/src/mesa/state_tracker/st_context.c b/src/mesa/state_tracker/st_context.c
index a7b2cfc12ba..3ba48479266 100644
--- a/src/mesa/state_tracker/st_context.c
+++ b/src/mesa/state_tracker/st_context.c
@@ -372,8 +372,6 @@ st_create_context_priv(struct gl_context *ctx, struct pipe_context *pipe,
 
    st->dirty = ST_ALL_STATES_MASK;
 
-   st->has_user_constbuf =
-      screen->get_param(screen, PIPE_CAP_USER_CONSTANT_BUFFERS);
    st->can_bind_const_buffer_as_vertex =
       screen->get_param(screen, PIPE_CAP_CAN_BIND_CONST_BUFFER_AS_VERTEX);
 
diff --git a/src/mesa/state_tracker/st_context.h b/src/mesa/state_tracker/st_context.h
index 9f33eed8f36..0258bed36b1 100644
--- a/src/mesa/state_tracker/st_context.h
+++ b/src/mesa/state_tracker/st_context.h
@@ -110,7 +110,6 @@ struct st_context
    boolean has_shareable_shaders;
    boolean has_half_float_packing;
    boolean has_multi_draw_indirect;
-   boolean has_user_constbuf;
    boolean can_bind_const_buffer_as_vertex;
 
    /**
diff --git a/src/mesa/state_tracker/st_pbo.c b/src/mesa/state_tracker/st_pbo.c
index 303c8535b20..628e3ca64a5 100644
--- a/src/mesa/state_tracker/st_pbo.c
+++ b/src/mesa/state_tracker/st_pbo.c
@@ -259,21 +259,9 @@ st_pbo_draw(struct st_context *st, const struct st_pbo_addresses *addr,
    {
       struct pipe_constant_buffer cb;
 
-      if (!st->has_user_constbuf) {
-         cb.buffer = NULL;
-         cb.user_buffer = NULL;
-         u_upload_data(st->pipe->const_uploader, 0, sizeof(addr->constants),
-                       st->ctx->Const.UniformBufferOffsetAlignment,
-                       &addr->constants, &cb.buffer_offset, &cb.buffer);
-         if (!cb.buffer)
-            return false;
-
-         u_upload_unmap(st->pipe->const_uploader);
-      } else {
-         cb.buffer = NULL;
-         cb.user_buffer = &addr->constants;
-         cb.buffer_offset = 0;
-      }
+      cb.buffer = NULL;
+      cb.user_buffer = &addr->constants;
+      cb.buffer_offset = 0;
       cb.buffer_size = sizeof(addr->constants);
 
       cso_set_constant_buffer(cso, PIPE_SHADER_FRAGMENT, 0, &cb);