Further shader compilation development.

include/opengl/handles/shader_handle.hpp

@@ -8,6 +8,11 @@ struct shader_handle
 {
 	constexpr bool operator==(const shader_handle&) const = default;
 
-	GLuint shader_id{ 0 };
+	constexpr bool valid() const
+	{
+		return id != 0;
+	}
+
+	GLuint id{ 0 };
 };
 }

include/opengl/handles/shader_handle_set.hpp

@@ -0,0 +1,13 @@
+#pragma once
+#include "shader_handle.hpp"
+#include "opengl/shading/shader_stage.hpp"
+
+namespace zgl
+{
+
+struct shader_handle_set
+{
+	std::array<shader_handle, zgl::shading::stage::count> stages;
+};
+
+}