[Mesa-dev] [PATCH v3 6/6] spirv: Do implicit conversions of uint to bool in OpStore

[Jason Ekstrand]

Technically, the GLSLang bug related to this can also affect SSBO writes
where the bool -> uint conversion is missing.  However, the only known
shipping application with an old enough version of GLSLang to cause
issues with this is the new DOOM game so we keep the workaround as small
as possible.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104424
---
 src/compiler/spirv/vtn_variables.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/src/compiler/spirv/vtn_variables.c b/src/compiler/spirv/vtn_variables.c
index 41125f6..eb306d0 100644
--- a/src/compiler/spirv/vtn_variables.c
+++ b/src/compiler/spirv/vtn_variables.c
@@ -2041,6 +2041,25 @@ vtn_handle_variables(struct vtn_builder *b, SpvOp opcode,
       vtn_fail_if(dest->type->type == NULL,
                   "Invalid destination type for OpStore");
 
+      if (glsl_get_base_type(dest->type->type) == GLSL_TYPE_BOOL &&
+          glsl_get_base_type(src_val->type->type) == GLSL_TYPE_UINT) {
+         /* Early versions of GLSLang would use uint types for UBOs/SSBOs but
+          * would then store them to a local variable as bool.  Work around
+          * the issue by doing an implicit conversion.
+          *
+          * https://github.com/KhronosGroup/glslang/issues/170
+          * https://bugs.freedesktop.org/show_bug.cgi?id=104424
+          */
+         vtn_warn("OpStore of value of type OpTypeInt to a pointer to type "
+                  "OpTypeBool.  Doing an implicit conversion to work around "
+                  "the problem.");
+         struct vtn_ssa_value *bool_ssa =
+            vtn_create_ssa_value(b, dest->type->type);
+         bool_ssa->def = nir_i2b(&b->nb, vtn_ssa_value(b, w[2])->def);
+         vtn_variable_store(b, bool_ssa, dest);
+         break;
+      }
+
       vtn_assert_types_equal(b, opcode, dest_val->type->deref, src_val->type);
 
       if (glsl_type_is_sampler(dest->type->type)) {
-- 
2.5.0.400.gff86faf