Added header

examples/utils/vsgcustomshaderset/custom_pbr.h

@@ -0,0 +1,43 @@
+#pragma once
+
+#include <vsg/maths/vec3.h>
+
+namespace custom
+{
+    // OpenGL style fog struct to pass to the GPU
+    struct Fog
+    {
+        vsg::vec3 color = {1.0, 1.0, 1.0};
+        float density = 0.05; // OpenGL default is 1.0!
+        float start = 0.0;
+        float end = 1.0;
+        float exponent = 1.0;
+
+        void read(vsg::Input& input)
+        {
+            input.read("color", color);
+            input.read("density", density);
+            input.read("start", start);
+            input.read("end", end);
+            input.read("exponent", exponent);
+        }
+
+        void write(vsg::Output& output) const
+        {
+            output.write("color", color);
+            output.write("density", density);
+            output.write("start", start);
+            output.write("end", end);
+            output.write("exponent", exponent);
+        }
+    };
+
+    using FogValue = vsg::Value<Fog>;
+
+    extern vsg::ref_ptr<vsg::ShaderSet> pbr_ShaderSet(vsg::ref_ptr<const vsg::Options> options);
+}
+
+template<>
+constexpr bool vsg::has_read_write<custom::Fog>() { return true; }
+
+EVSG_type_name(custom::FogValue);