vkd3d-shader/hlsl: Declare vars individually when parsing regular declarations.

In a declaration with multiple variables, the variables must be created
before the initializer of the next variable is parsed. This is required
for initializers such as:

    float a = 1, b = a, c = b + 1;

A requisite for this is that the type information is parsed in the same
rule as the first variable (as a variable_def_typed) so it is
immediately available to declare the first variable. Then, the next
untyped variable declaration is parsed, and the type from the first
variable can be used to declare the second, before the third is parsed,
and so on.

libs/vkd3d-shader/hlsl.y

@@ -73,6 +73,10 @@ struct parse_variable_def
     struct hlsl_semantic semantic;
     struct hlsl_reg_reservation reg_reservation;
     struct parse_initializer initializer;
+
+    struct hlsl_type *basic_type;
+    unsigned int modifiers;
+    struct vkd3d_shader_location modifiers_loc;
 };
 
 struct parse_function
@@ -1964,11 +1968,12 @@ static void check_invalid_in_out_modifiers(struct hlsl_ctx *ctx, unsigned int mo
     }
 }
 
-static void declare_var(struct hlsl_ctx *ctx, struct hlsl_type *basic_type,
-        unsigned int modifiers, const struct vkd3d_shader_location *modifiers_loc, struct parse_variable_def *v)
+static void declare_var(struct hlsl_ctx *ctx, struct parse_variable_def *v)
 {
+    struct hlsl_type *basic_type = v->basic_type;
     struct hlsl_ir_function_decl *func;
     struct hlsl_semantic new_semantic;
+    uint32_t modifiers = v->modifiers;
     bool unbounded_res_array = false;
     struct hlsl_ir_var *var;
     struct hlsl_type *type;
@@ -4554,6 +4559,7 @@ static void validate_texture_format_type(struct hlsl_ctx *ctx, struct hlsl_type
 %type <list> unary_expr
 %type <list> variables_def
 %type <list> variables_def_optional
+%type <list> variables_def_typed
 
 %token <name> VAR_IDENTIFIER
 %token <name> NEW_IDENTIFIER
@@ -4616,6 +4622,7 @@ static void validate_texture_format_type(struct hlsl_ctx *ctx, struct hlsl_type
 %type <variable_def> type_spec
 %type <variable_def> variable_decl
 %type <variable_def> variable_def
+%type <variable_def> variable_def_typed
 
 %%
 
@@ -4710,7 +4717,11 @@ struct_declaration:
             {
                 LIST_FOR_EACH_ENTRY_SAFE(v, v_next, $3, struct parse_variable_def, entry)
                 {
-                    declare_var(ctx, type, modifiers, &@1, v);
+                    v->basic_type = type;
+                    v->modifiers = modifiers;
+                    v->modifiers_loc = @1;
+
+                    declare_var(ctx, v);
                 }
 
                 if (!($$ = initialize_vars(ctx, $3)))
@@ -5562,23 +5573,9 @@ type_spec:
         }
 
 declaration:
-      var_modifiers type variables_def ';'
+      variables_def_typed ';'
         {
-            struct parse_variable_def *v, *v_next;
-            struct hlsl_type *type;
-            unsigned int modifiers = $1;
-
-            if (!(type = apply_type_modifiers(ctx, $2, &modifiers, true, &@1)))
-                YYABORT;
-
-            check_invalid_in_out_modifiers(ctx, modifiers, &@1);
-
-            LIST_FOR_EACH_ENTRY_SAFE(v, v_next, $3, struct parse_variable_def, entry)
-            {
-                declare_var(ctx, type, modifiers, &@1, v);
-            }
-
-            if (!($$ = initialize_vars(ctx, $3)))
+            if (!($$ = initialize_vars(ctx, $1)))
                 YYABORT;
         }
 
@@ -5602,6 +5599,33 @@ variables_def:
             list_add_tail($$, &$3->entry);
         }
 
+variables_def_typed:
+      variable_def_typed
+        {
+            if (!($$ = make_empty_list(ctx)))
+                YYABORT;
+            list_add_head($$, &$1->entry);
+
+            declare_var(ctx, $1);
+        }
+    | variables_def_typed ',' variable_def
+        {
+            struct parse_variable_def *head_def;
+
+            assert(!list_empty($1));
+            head_def = LIST_ENTRY(list_head($1), struct parse_variable_def, entry);
+
+            assert(head_def->basic_type);
+            $3->basic_type = head_def->basic_type;
+            $3->modifiers = head_def->modifiers;
+            $3->modifiers_loc = head_def->modifiers_loc;
+
+            declare_var(ctx, $3);
+
+            $$ = $1;
+            list_add_tail($$, &$3->entry);
+        }
+
 variable_decl:
       any_identifier arrays colon_attribute
         {
@@ -5643,6 +5667,23 @@ variable_def:
             ctx->in_state_block = 0;
         }
 
+variable_def_typed:
+      var_modifiers type variable_def
+        {
+            unsigned int modifiers = $1;
+            struct hlsl_type *type;
+
+            if (!(type = apply_type_modifiers(ctx, $2, &modifiers, true, &@1)))
+                YYABORT;
+
+            check_invalid_in_out_modifiers(ctx, modifiers, &@1);
+
+            $$ = $3;
+            $$->basic_type = type;
+            $$->modifiers = modifiers;
+            $$->modifiers_loc = @1;
+        }
+
 arrays:
       %empty
         {

tests/hlsl/initializer-multi.shader_test

@@ -1,4 +1,4 @@
-[pixel shader todo]
+[pixel shader]
 float4 main() : sv_target
 {
     float a = 2.0, b = a + 1.0, c = b;
@@ -7,7 +7,7 @@ float4 main() : sv_target
 }
 
 [test]
-todo draw quad
+draw quad
 probe all rgba (2, 3, 3, 0)