Francisco Casas : vkd3d-shader/hlsl: Don't produce a parse error on empty buffer_body.

[Alexandre Julliard]

Module: vkd3d
Branch: master
Commit: bd501ce33662e87add2dd7cdbb734b9e074a8c05
URL:    https://gitlab.winehq.org/wine/vkd3d/-/commit/bd501ce33662e87add2dd7cdbb734b...

Author: Francisco Casas <fcasas(a)codeweavers.com>
Date:   Mon Oct 31 18:13:26 2022 -0300

vkd3d-shader/hlsl: Don't produce a parse error on empty buffer_body.

---

 Makefile.am               |  1 +
 libs/vkd3d-shader/hlsl.y  |  2 +-
 tests/cbuffer.shader_test | 17 +++++++++++++++++
 3 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/Makefile.am b/Makefile.am
index 74c45aed..85cd4642 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -65,6 +65,7 @@ vkd3d_shader_tests = \
 	tests/cast-to-half.shader_test \
 	tests/cast-to-int.shader_test \
 	tests/cast-to-uint.shader_test \
+	tests/cbuffer.shader_test \
 	tests/compute.shader_test \
 	tests/conditional.shader_test \
 	tests/floor.shader_test \
diff --git a/libs/vkd3d-shader/hlsl.y b/libs/vkd3d-shader/hlsl.y
index 6461ade5..c1fb003d 100644
--- a/libs/vkd3d-shader/hlsl.y
+++ b/libs/vkd3d-shader/hlsl.y
@@ -3361,7 +3361,7 @@ buffer_type:
         }
 
 declaration_statement_list:
-      declaration_statement
+      %empty
     | declaration_statement_list declaration_statement
 
 preproc_directive:
diff --git a/tests/cbuffer.shader_test b/tests/cbuffer.shader_test
new file mode 100644
index 00000000..07ef18db
--- /dev/null
+++ b/tests/cbuffer.shader_test
@@ -0,0 +1,17 @@
+[pixel shader]
+// Test empty constant buffer.
+cbuffer Constants : register(b1)
+{
+};
+
+float4 foo;
+
+float4 main() : sv_target
+{
+    return foo;
+}
+
+[test]
+uniform 0 float4 1.0 2.0 3.0 4.0
+draw quad
+probe all rgba (1.0, 2.0, 3.0, 4.0)