Add ktx

ktx/tests/loadtests/vkloadtests/shaders/cubemap/skybox.frag

@@ -0,0 +1,18 @@
+// Copyright 2017 Mark Callow
+// SPDX-License-Identifier: Apache-2.0
+
+#version 450
+
+#extension GL_ARB_separate_shader_objects : enable
+#extension GL_ARB_shading_language_420pack : enable
+
+layout (binding = 1) uniform samplerCube samplerCubeMap;
+
+layout (location = 0) in vec3 inUVW;
+
+layout (location = 0) out vec4 outFragColor;
+
+void main() 
+{
+	outFragColor = texture(samplerCubeMap, inUVW);
+}