Full savestating to memory

include/ppu.h

@@ -86,6 +86,13 @@ typedef struct {
     bool debug;
 } ppu_context;
 
+typedef struct {
+    ppu_context ctx;
+} ppu_state;
+
+void ppu_save_state(ppu_state*);
+void ppu_load_state(const ppu_state*);
+
 void ppu_init();
 void ppu_tick();