Feature/glslang spirv version (#1256)

* WIP add support for __spirv_version .

* Added IRRequireSPIRVVersionDecoration

* SPIR-V version passed to glslang.
Enable VK wave tests.
Split ExtensionTracker out, so can be cast and used externally to emit.
Added SourceResult.

* Fix warning on Clang.

* Missing hlsl.meta.h

* Refactor communication/parsing of __spirv_version with glslang.

* Fix some debug typos.
Be more precise in handling of substring handling.

* Make glslang forwards and backwards binary compatible.

* Small comment improvements.

* Added slang-spirv-target-info.h/cpp

* Fix for major/minor on gcc.

* Another fix for gcc/clang.

* VS projects include slang-spirv-target-info.h/cpp

* Removed SPIRVTargetInfo
Added SemanticVersion.
Don't bother with passing a target to glslang. Should be separate from 'version'.

* Renamed slang-emit-glsl-extension-tracker.cpp/.h -> slang-glsl-extension-tracker.cpp/.h
Fixed some VS project issues.

* Fix a comment.

* Added slang-semantic-version.cpp/.h

* Added slang-glsl-extension-tracker.cpp/.h

* Added split that can check for input has all been parsed.

* Fix problem on x86 win build.

1 files changed, 64 insertions, 0 deletions

diff --git a/source/slang/slang-glsl-extension-tracker.cpp b/source/slang/slang-glsl-extension-tracker.cpp
new file mode 100644
index 000000000..30acd8936
--- /dev/null
+++ b/source/slang/slang-glsl-extension-tracker.cpp
@@ -0,0 +1,64 @@
+// slang-glsl-extension-tracker.cpp
+#include "slang-glsl-extension-tracker.h"
+
+namespace Slang {
+
+void GLSLExtensionTracker::appendExtensionRequireLines(StringBuilder& ioBuilder) const
+{
+    for (const auto& extension : m_extensionPool.getSlices())
+    {
+        ioBuilder.append("#extension ");
+        ioBuilder.append(extension);
+        ioBuilder.append(" : require\n");
+    }
+}
+
+void GLSLExtensionTracker::requireSPIRVVersion(const SemanticVersion& version)
+{
+    if (version > m_spirvVersion)
+    {
+        m_spirvVersion = version;
+    }
+}
+
+void GLSLExtensionTracker::requireVersion(ProfileVersion version)
+{
+    // Check if this profile is newer
+    if ((UInt)version > (UInt)m_profileVersion)
+    {
+        m_profileVersion = version;
+    }
+}
+
+void GLSLExtensionTracker::requireBaseTypeExtension(BaseType baseType)
+{
+    uint32_t bit = 1 << int(baseType);
+    if (m_hasBaseTypeFlags & bit)
+    {
+        return;
+    }
+
+    switch (baseType)
+    {
+        case BaseType::Half:
+        {
+            // https://github.com/KhronosGroup/GLSL/blob/master/extensions/ext/GL_EXT_shader_16bit_storage.txt
+            requireExtension(UnownedStringSlice::fromLiteral("GL_EXT_shader_16bit_storage"));
+
+            // https://github.com/KhronosGroup/GLSL/blob/master/extensions/ext/GL_EXT_shader_explicit_arithmetic_types.txt
+            requireExtension(UnownedStringSlice::fromLiteral("GL_EXT_shader_explicit_arithmetic_types"));
+            break;
+        }
+        case BaseType::UInt64:
+        case BaseType::Int64:
+        {
+            requireExtension(UnownedStringSlice::fromLiteral("GL_EXT_shader_explicit_arithmetic_types_int64"));
+            m_hasBaseTypeFlags |= _getFlag(BaseType::UInt64) | _getFlag(BaseType::Int64);
+            break;
+        }
+    }
+
+    m_hasBaseTypeFlags |= bit;
+}
+
+} // namespace Slang