Cleaned up mapping.

zsnes/src/cpu/memtable.h

@@ -0,0 +1,43 @@
+#ifndef MEMTABLE_H
+#define MEMTABLE_H
+
+extern void (*memtabler8[256])();
+extern void (*memtablew8[256])();
+extern void (*memtabler16[256])();
+extern void (*memtablew16[256])();
+
+typedef struct
+{
+  void (*memr8)();
+  void (*memw8)();
+  void (*memr16)();
+  void (*memw16)();
+} mrwp;
+
+extern mrwp regbank, membank, wrambank, srambank, erambank, sramsbank;
+extern mrwp sa1regbank, sa1rambank, sa1rambankb;
+extern mrwp dsp1bank, dsp2bank, dsp4bank;
+extern mrwp setabank, setabanka;
+extern mrwp sfxbank, sfxbankb, sfxbankc, sfxbankd;
+
+/*
+rep_stosd is my name for a 'copy <num> times a function pointer <func_ptr> into
+a function pointer array <dest>' function, in honour of the almighty asm
+instruction rep stosd, which is able to do that (and much more).
+Since ZSNES is just full of func pointer arrays, it'll probably come in handy.
+*/
+
+static void rep_stosd(void (**dest)(), void (*func_ptr), size_t num)
+{
+  while (num--) { dest[num] = func_ptr; }
+}
+
+static void map_mem(size_t dest, mrwp *src, size_t num)
+{
+  rep_stosd(memtabler8+dest, src->memr8, num);
+  rep_stosd(memtablew8+dest, src->memw8, num);
+  rep_stosd(memtabler16+dest, src->memr16, num);
+  rep_stosd(memtablew16+dest, src->memw16, num);
+}
+
+#endif