Add-support-for-SPV_NVX_raytracing

Test/spv.RayConstants.rgen

@@ -0,0 +1,15 @@
+#version 460
+#extension GL_NVX_raytracing : enable
+layout(binding = 0, set = 0) uniform accelerationStructureNVX accNV;
+layout(location = 0) rayPayloadNVX vec4 payload;
+void main()
+{
+    const uint rayFlags = gl_RayFlagsNoneNVX | gl_RayFlagsOpaqueNVX |
+                          gl_RayFlagsNoOpaqueNVX | gl_RayFlagsTerminateOnFirstHitNVX |
+                          gl_RayFlagsSkipClosestHitShaderNVX | gl_RayFlagsCullBackFacingTrianglesNVX |
+                          gl_RayFlagsCullFrontFacingTrianglesNVX | gl_RayFlagsCullOpaqueNVX | 
+                          gl_RayFlagsCullNoOpaqueNVX;
+
+    const int payloadId = 1;
+    traceNVX(accNV, rayFlags, 0, 1, 1, 0, vec3(0.0f), 0.5f, vec3(1.0f), 0.75f, payloadId);
+}