New version of the samples and tutorials based on KHR_ray_tracing

ray_tracing__simple/shaders/raytrace.rmiss

@@ -0,0 +1,16 @@
+#version 460
+#extension GL_EXT_ray_tracing : require
+#extension GL_GOOGLE_include_directive : enable
+#include "raycommon.glsl"
+
+layout(location = 0) rayPayloadInEXT hitPayload prd;
+
+layout(push_constant) uniform Constants
+{
+  vec4 clearColor;
+};
+
+void main()
+{
+  prd.hitValue = clearColor.xyz * 0.8;
+}