Implement GL_EXT_vulkan_glsl_relaxed option

glslang/Include/Types.h

@@ -501,6 +501,7 @@ public:
         noContraction = false;
         nullInit = false;
 #endif
+        defaultBlock = false;
     }
 
     // drop qualifiers that don't belong in a temporary variable
@@ -514,6 +515,7 @@ public:
         specConstant = false;
         nonUniform = false;
         nullInit = false;
+        defaultBlock = false;
         clearLayout();
     }
 
@@ -572,6 +574,7 @@ public:
     bool specConstant : 1;
     bool nonUniform   : 1;
     bool explicitOffset   : 1;
+    bool defaultBlock : 1; // default blocks with matching names have structures merged when linking
 
 #ifdef GLSLANG_WEB
     bool isWriteOnly() const { return false; }
@@ -756,6 +759,46 @@ public:
         }
     }
 
+    TBlockStorageClass getBlockStorage() const {
+        if (storage == EvqUniform && !isPushConstant()) {
+            return EbsUniform;
+        }
+        else if (storage == EvqUniform) {
+            return EbsPushConstant;
+        }
+        else if (storage == EvqBuffer) {
+            return EbsStorageBuffer;
+        }
+        return EbsNone;
+    }
+
+    void setBlockStorage(TBlockStorageClass newBacking) {
+#ifndef GLSLANG_WEB
+        layoutPushConstant = (newBacking == EbsPushConstant);
+#endif
+        switch (newBacking) {
+        case EbsUniform :
+            if (layoutPacking == ElpStd430) {
+                // std430 would not be valid
+                layoutPacking = ElpStd140;
+            }
+            storage = EvqUniform;
+            break;
+        case EbsStorageBuffer : 
+            storage = EvqBuffer;
+            break;
+#ifndef GLSLANG_WEB
+        case EbsPushConstant :
+            storage = EvqUniform;
+            layoutSet = TQualifier::layoutSetEnd;
+            layoutBinding = TQualifier::layoutBindingEnd;
+            break;
+#endif
+        default:
+            break;
+        }
+    }
+
 #ifdef GLSLANG_WEB
     bool isPerView() const { return false; }
     bool isTaskMemory() const { return false; }
@@ -852,6 +895,7 @@ public:
         return hasNonXfbLayout() ||
                hasXfb();
     }
+
     TLayoutMatrix  layoutMatrix  : 3;
     TLayoutPacking layoutPacking : 4;
     int layoutOffset;