Add vk_ray_trace_indirect_scissor sample

ray_tracing_indirect_scissor/shaders/lantern.rchit

@@ -0,0 +1,23 @@
+#version 460
+#extension GL_EXT_ray_tracing : require
+#extension GL_EXT_nonuniform_qualifier : enable
+#extension GL_EXT_scalar_block_layout : enable
+#extension GL_GOOGLE_include_directive : enable
+#include "raycommon.glsl"
+
+// Closest hit shader invoked when a primary ray hits a lantern.
+
+// clang-format off
+layout(location = 0) rayPayloadInEXT hitPayload prd;
+
+layout(binding = 2, set = 0) buffer LanternArray { LanternIndirectEntry lanterns[]; } lanterns;
+
+// clang-format on
+
+void main()
+{
+  // Just look up this lantern's color. Self-illuminating, so no lighting calculations.
+  LanternIndirectEntry lantern = lanterns.lanterns[nonuniformEXT(gl_InstanceCustomIndexEXT)];
+  prd.hitValue = vec3(lantern.red, lantern.green, lantern.blue);
+  prd.additiveBlending = false;
+}