From 0a6828572aa4cc1f0f99993e77c321799eb88cca Mon Sep 17 00:00:00 2001
From: Darren Wihandi <65404740+fairywreath@users.noreply.github.com>
Date: Sun, 2 Feb 2025 15:27:11 -0500
Subject: Add support for WGSL subgroup operations (#6213)

* initial work

* more work

* more work on glsl intrinsics

* add subgroup broadcast for glsl

* wip add wgsl extension tracking

* enable tests, enable extensions and added some todos

* format and warning fixes

* fix wgsl extension tracker

---------

Co-authored-by: Yong He <yonghe@outlook.com>
---
 source/slang/slang-extension-tracker.cpp | 102 +++++++++++++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 source/slang/slang-extension-tracker.cpp

(limited to 'source/slang/slang-extension-tracker.cpp')

diff --git a/source/slang/slang-extension-tracker.cpp b/source/slang/slang-extension-tracker.cpp
new file mode 100644
index 000000000..f3818cbba
--- /dev/null
+++ b/source/slang/slang-extension-tracker.cpp
@@ -0,0 +1,102 @@
+// slang-extension-tracker.cpp
+#include "slang-extension-tracker.h"
+
+namespace Slang
+{
+
+void ShaderExtensionTracker::appendExtensionRequireLinesForGLSL(StringBuilder& ioBuilder) const
+{
+    for (const auto& extension : m_extensionPool.getSlices())
+    {
+        ioBuilder.append("#extension ");
+        ioBuilder.append(extension);
+        ioBuilder.append(" : require\n");
+    }
+}
+
+void ShaderExtensionTracker::appendExtensionRequireLinesForWGSL(StringBuilder& ioBuilder) const
+{
+    for (const auto& extension : m_extensionPool.getSlices())
+    {
+        ioBuilder.append("enable ");
+        ioBuilder.append(extension);
+        ioBuilder.append(";\n");
+    }
+}
+
+void ShaderExtensionTracker::requireSPIRVVersion(const SemanticVersion& version)
+{
+    if (version > m_spirvVersion)
+    {
+        m_spirvVersion = version;
+    }
+}
+
+void ShaderExtensionTracker::requireVersion(ProfileVersion version)
+{
+    // Check if this profile is newer
+    if ((UInt)version > (UInt)m_profileVersion)
+    {
+        m_profileVersion = version;
+    }
+}
+
+void ShaderExtensionTracker::requireBaseTypeExtension(BaseType baseType)
+{
+    uint32_t bit = 1 << int(baseType);
+    if (m_hasBaseTypeFlags & bit)
+    {
+        return;
+    }
+
+    switch (baseType)
+    {
+    case BaseType::UInt8:
+    case BaseType::Int8:
+        {
+            // https://github.com/KhronosGroup/GLSL/blob/master/extensions/ext/GL_EXT_shader_8bit_storage.txt
+            requireExtension(UnownedStringSlice::fromLiteral("GL_EXT_shader_8bit_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::Half:
+    case BaseType::UInt16:
+    case BaseType::Int16:
+        {
+            // 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) |
+                                  _getFlag(BaseType::IntPtr) | _getFlag(BaseType::UIntPtr);
+            break;
+        }
+    case BaseType::IntPtr:
+    case BaseType::UIntPtr:
+        {
+#if SLANG_PTR_IS_64
+            requireExtension(
+                UnownedStringSlice::fromLiteral("GL_EXT_shader_explicit_arithmetic_types_int64"));
+            m_hasBaseTypeFlags |= _getFlag(BaseType::UInt64) | _getFlag(BaseType::Int64) |
+                                  _getFlag(BaseType::IntPtr) | _getFlag(BaseType::UIntPtr);
+#endif
+            break;
+        }
+    }
+
+    m_hasBaseTypeFlags |= bit;
+}
+
+} // namespace Slang
-- 
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