New version of the samples and tutorials based on KHR_ray_tracing

ray_tracing_intersection/shaders/raycommon.glsl

@@ -0,0 +1,19 @@
+struct hitPayload
+{
+  vec3 hitValue;
+};
+
+struct Sphere
+{
+  vec3  center;
+  float radius;
+};
+
+struct Aabb
+{
+  vec3 minimum;
+  vec3 maximum;
+};
+
+#define KIND_SPHERE 0
+#define KIND_CUBE 1