Improve Vulkan shader-objects implementation. (#1765)

* Improve Vulkan shader-objects implementation.

1. Null bindings no longer crashes.
2. No longer copies push constants to staging CPU buffer before setting it into command buffer. The entry-point shader object now directly sets it into command buffer upon `bindObject` call.

* Update comments

* Fix

* Re-enable 3 tests.

Improved vulkan implementation so that each shader object is responsible for creating descriptor sets on-demand.

Fixed slang reflection to correctly report `ParameterBlock` binding.

* Fix gcc compile error.

1 files changed, 4 insertions, 0 deletions

diff --git a/source/slang/slang-reflection-api.cpp b/source/slang/slang-reflection-api.cpp
index cd141a622..2031b4a0f 100644
--- a/source/slang/slang-reflection-api.cpp
+++ b/source/slang/slang-reflection-api.cpp
@@ -1152,6 +1152,10 @@ namespace Slang
         {
             return SLANG_BINDING_TYPE_SAMPLER;
         }
+        else if (as<ParameterBlockType>(type))
+        {
+            return SLANG_BINDING_TYPE_PARAMETER_BLOCK;
+        }
         else
         {
             return SLANG_BINDING_TYPE_UNKNOWN;