Don't assign a `binding` to a `push_constant` buffer

Fixes #12

- This was a latent issue, but the previous commit brought it to the front.

- As indicated in #12, I don't allocate a descriptor-table slot to the block
  - Instead I allocate a `PushConstantBuffer`

- Unlike what #12 asks for, I don't use a different resource type for the contents of the block
  - Pretty much all the logic is easiest if these continue to be just plain `Uniform` data

1 files changed, 6 insertions, 1 deletions

diff --git a/source/slang/parameter-binding.cpp b/source/slang/parameter-binding.cpp
index 0683c7f8c..01727fb36 100644
--- a/source/slang/parameter-binding.cpp
+++ b/source/slang/parameter-binding.cpp
@@ -101,7 +101,7 @@ struct ParameterBindingInfo
 
 enum
 {
-    kLayoutResourceKindCount = SLANG_PARAMETER_CATEGORY_MIXED,
+    kLayoutResourceKindCount = SLANG_PARAMETER_CATEGORY_COUNT,
 };
 
 // Information on a single parameter
@@ -290,6 +290,11 @@ getTypeLayoutForGlobalShaderParameter_GLSL(
     // any more. As such we also inspect the type
     // of the variable.
 
+    // We want to check for a constant-buffer type with a `push_constant` layout
+    // qualifier before we move on to anything else.
+    if (varDecl->HasModifier<GLSLPushConstantLayoutModifier>() && type->As<ConstantBufferType>())
+        return CreateTypeLayout(type, rules->getPushConstantBufferRules());
+
     // TODO(tfoley): We have multiple variations of
     // the `uniform` modifier right now, and that
     // needs to get fixed...