[WIP] Refactor project

There are many problems with the way the current version is provided
and maintained. This commit or series of commits will fix this.

graphics/rse_graphics.h

@@ -1,28 +1,31 @@
 #ifndef RSE_GRAPHICS_H
 #define RSE_GRAPHICS_H
 
-#include "utilities/rse_commons.h"
+#include "utilities/commons.h"
+
+struct rse_graphics_context_t;
 
 /**
  * @brief Initializes graphics backend. This has to be called before any new mesh, texture or any other object is
  * added
  *
+ * @param context Graphics context handle. Must be NULL!
  * @return rse_err_t RSE_ERROR_NO_ERROR on success
  */
-rse_err_t rse_graphics_init(void);
+rse_err_t rse_graphics_init(struct rse_graphics_context_t* context);
 
 /**
  * @brief Runs graphics engine. This has to be called after all objects are added to the scene
  *
  * @return rse_err_t RSE_ERROR_NO_ERROR on success
  */
-rse_err_t rse_graphics_run(void);
+rse_err_t rse_graphics_run(struct rse_graphics_context_t* context);
 
 
 /**
- * @brief Custom function for testing engine. Remove it whe releasing
+ * @brief Custom function for testing engine. TODO: Remove it whe releasing
  *
  */
-void rse_graphics_test_function(void);
+void rse_graphics_test_function(struct rse_graphics_context_t* context);
 
 #endif /* RSE_GRAPHICS_H */