Implement the extension GL_ARB_gpu_shader_int64

- Add new keyword int64_t/uint64_t/i64vec/u64vec.
- Support 64-bit integer literals (dec/hex/oct).
- Support built-in operators for 64-bit integer type.
- Add implicit and explicit type conversion for 64-bit integer type.
- Add new built-in functions defined in this extension.

glslang/Include/intermediate.h

@@ -81,22 +81,44 @@ enum TOperator {
     EOpConvUintToBool,
     EOpConvFloatToBool,
     EOpConvDoubleToBool,
+    EOpConvInt64ToBool,
+    EOpConvUint64ToBool,
     EOpConvBoolToFloat,
     EOpConvIntToFloat,
     EOpConvUintToFloat,
     EOpConvDoubleToFloat,
+    EOpConvInt64ToFloat,
+    EOpConvUint64ToFloat,
     EOpConvUintToInt,
     EOpConvFloatToInt,
     EOpConvBoolToInt,
     EOpConvDoubleToInt,
+    EOpConvInt64ToInt,
+    EOpConvUint64ToInt,
     EOpConvIntToUint,
     EOpConvFloatToUint,
     EOpConvBoolToUint,
     EOpConvDoubleToUint,
+    EOpConvInt64ToUint,
+    EOpConvUint64ToUint,
     EOpConvIntToDouble,
     EOpConvUintToDouble,
     EOpConvFloatToDouble,
     EOpConvBoolToDouble,
+    EOpConvInt64ToDouble,
+    EOpConvUint64ToDouble,
+    EOpConvBoolToInt64,
+    EOpConvIntToInt64,
+    EOpConvUintToInt64,
+    EOpConvFloatToInt64,
+    EOpConvDoubleToInt64,
+    EOpConvUint64ToInt64,
+    EOpConvBoolToUint64,
+    EOpConvIntToUint64,
+    EOpConvUintToUint64,
+    EOpConvFloatToUint64,
+    EOpConvDoubleToUint64,
+    EOpConvInt64ToUint64,
 
     //
     // binary operations
@@ -194,6 +216,10 @@ enum TOperator {
     EOpFloatBitsToUint,
     EOpIntBitsToFloat,
     EOpUintBitsToFloat,
+    EOpDoubleBitsToInt64,
+    EOpDoubleBitsToUint64,
+    EOpInt64BitsToDouble,
+    EOpUint64BitsToDouble,
     EOpPackSnorm2x16,
     EOpUnpackSnorm2x16,
     EOpPackUnorm2x16,
@@ -206,6 +232,10 @@ enum TOperator {
     EOpUnpackHalf2x16,
     EOpPackDouble2x32,
     EOpUnpackDouble2x32,
+    EOpPackInt2x32,
+    EOpUnpackInt2x32,
+    EOpPackUint2x32,
+    EOpUnpackUint2x32,
 
     EOpLength,
     EOpDistance,
@@ -287,6 +317,8 @@ enum TOperator {
     EOpConstructGuardStart,
     EOpConstructInt,          // these first scalar forms also identify what implicit conversion is needed
     EOpConstructUint,
+    EOpConstructInt64,
+    EOpConstructUint64,
     EOpConstructBool,
     EOpConstructFloat,
     EOpConstructDouble,
@@ -305,6 +337,12 @@ enum TOperator {
     EOpConstructUVec2,
     EOpConstructUVec3,
     EOpConstructUVec4,
+    EOpConstructI64Vec2,
+    EOpConstructI64Vec3,
+    EOpConstructI64Vec4,
+    EOpConstructU64Vec2,
+    EOpConstructU64Vec3,
+    EOpConstructU64Vec4,
     EOpConstructMat2x2,
     EOpConstructMat2x3,
     EOpConstructMat2x4,