glsl: add struct to gather more info about uniform array access

This will be used in the following patches to allow the linker
to resize uniform arrays based on array dereferences.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4910>

diff --git a/src/compiler/glsl/gl_nir_link_uniforms.c b/src/compiler/glsl/gl_nir_link_uniforms.c
index c8d32bdf3384668ef109c0afdfb54328ccb9db94..6682f6ea48e631cc3fbef65873052d527d4d5d70 100644 (file)
--- a/src/compiler/glsl/gl_nir_link_uniforms.c
+++ b/src/compiler/glsl/gl_nir_link_uniforms.c
@@ -36,6 +36,17 @@
 
 #define UNMAPPED_UNIFORM_LOC ~0u
 
+struct uniform_array_info {
+   /** List of dereferences of the uniform array. */
+   struct util_dynarray *deref_list;
+
+   /** Set of bit-flags to note which array elements have been accessed. */
+   BITSET_WORD *indices;
+
+   /** Have we rezized this array yet */
+   bool resized;
+};
+
 /**
  * Built-in / reserved GL variables names start with "gl_"
  */
@@ -349,18 +360,25 @@ add_var_use_deref(nir_deref_instr *deref, struct hash_table *live,
 
    nir_deref_path_finish(&path);
 
-   /** Set of bit-flags to note which array elements have been accessed. */
-   BITSET_WORD *bits = NULL;
+
+   struct uniform_array_info *ainfo = NULL;
 
    struct hash_entry *entry =
       _mesa_hash_table_search(live, deref->var);
    if (!entry && glsl_type_is_array(deref->var->type)) {
+      ainfo = ralloc(live, struct uniform_array_info);
+
       unsigned num_bits = MAX2(1, glsl_get_aoa_size(deref->var->type));
-      bits = rzalloc_array(live, BITSET_WORD, BITSET_WORDS(num_bits));
+      ainfo->indices = rzalloc_array(live, BITSET_WORD, BITSET_WORDS(num_bits));
+
+      ainfo->deref_list = ralloc(live, struct util_dynarray);
+      util_dynarray_init(ainfo->deref_list, live);
+
+      ainfo->resized = false;
    }
 
    if (entry)
-      bits = (BITSET_WORD *) entry->data;
+      ainfo = (struct uniform_array_info *) entry->data;
 
    if (glsl_type_is_array(deref->var->type)) {
       /* Count the "depth" of the arrays-of-arrays. */
@@ -372,11 +390,13 @@ add_var_use_deref(nir_deref_instr *deref, struct hash_table *live,
       }
 
       link_util_mark_array_elements_referenced(*derefs, num_derefs, array_depth,
-                                               bits);
+                                               ainfo->indices);
+
+      util_dynarray_append(ainfo->deref_list, nir_deref_instr *, deref);
    }
 
    assert(deref->mode == deref->var->data.mode);
-   _mesa_hash_table_insert(live, deref->var, bits);
+   _mesa_hash_table_insert(live, deref->var, ainfo);
 }
 
 /* Iterate over the shader and collect infomation about uniform use */
@@ -1546,8 +1566,9 @@ gl_nir_link_uniforms(struct gl_context *ctx,
                      struct hash_entry *entry =
                         _mesa_hash_table_search(state.referenced_uniforms, var);
                      if (entry) {
-                        BITSET_WORD *bits = (BITSET_WORD *) entry->data;
-                        if (BITSET_TEST(bits, blocks[i].linearized_array_index))
+                        struct uniform_array_info *ainfo =
+                           (struct uniform_array_info *) entry->data;
+                        if (BITSET_TEST(ainfo->indices, blocks[i].linearized_array_index))
                            blocks[i].stageref |= 1U << shader_type;
                      }
                   }