work on moving shader loading/compilation to a separate file

inc/shaders.hpp

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <glad/glad.h>
+#include <variant>
+#include "util.hpp"
+
+namespace shader {
+
+// Reads shader source files, compiles, and links
+bool load(uint* out_id, const char *vertex_filepath, const char *fragment_filepath);
+
+// Sets shader as active on the gpu
+void use(uint id);
+
+// Set uniform value
+typedef std::variant<int, float, bool> uniform_variant;
+void set_uniform(uint id, const char *name, uniform_variant value);
+
+} // namespace shaders