Add a combined version define in MaterialX C++ (AcademySoftwareFounda…

…tion#2031)

PR for AcademySoftwareFoundation#1609

Also added a simple test in source/MaterialXTest/MaterialXCore

source/MaterialXCore/Library.h

@@ -21,6 +21,11 @@
 
 #include <MaterialXCore/Generated.h>
 
+#define MATERIALX_GENERATE_INDEX(major, minor, build) \
+    ((((uint32_t)(major)) << 22U) | (((uint32_t)(minor)) << 12U) | ((uint32_t)(build)))
+#define MATERIALX_VERSION_INDEX \
+    MATERIALX_GENERATE_INDEX(MATERIALX_MAJOR_VERSION, MATERIALX_MINOR_VERSION, MATERIALX_BUILD_VERSION)
+
 /// Platform-specific macros for declaring imported and exported symbols.
 #if defined(MATERIALX_BUILD_SHARED_LIBS)
     #if defined(_WIN32)

source/MaterialXTest/MaterialXCore/CoreUtil.cpp

@@ -10,6 +10,12 @@
 
 namespace mx = MaterialX;
 
+TEST_CASE("Version comparison", "[coreutil]")
+{
+    // Test for version comparison
+    REQUIRE(MATERIALX_VERSION_INDEX > MATERIALX_GENERATE_INDEX(1, 38, 8));
+}
+
 TEST_CASE("String utilities", "[coreutil]")
 {
     std::string invalidName("test.name");