added a spetacular hack to support cheevos

libgambatte/include/gambatte.h

@@ -114,6 +114,10 @@ public:
    void setGameShark(const std::string &codes);
 
    void clearCheats();
+   
+#ifdef __LIBRETRO__
+   unsigned char read(unsigned p) const;
+#endif
 
 private:
 	struct Priv;

libgambatte/libretro/libretro.cpp

@@ -545,6 +545,8 @@ unsigned retro_get_region() { return RETRO_REGION_NTSC; }
 
 void *retro_get_memory_data(unsigned id)
 {
+   static uint8_t bytes[4];
+   
    switch (id)
    {
       case RETRO_MEMORY_SAVE_RAM:
@@ -557,6 +559,17 @@ void *retro_get_memory_data(unsigned id)
           * realizing that that memchunk hack is ugly, or 
           * otherwise getting rearranged. */
          return (char*)gb.savedata_ptr() + gb.savedata_size();
+      default:
+         /* An even uglier hack, since we pass an invalid memory
+          * id to read directly from the emulated memory. This is
+          * done so because both retro_get_memory_data and
+          * RETRO_ENVIRONMENT_SET_MEMORY_MAPS are too restrictive
+          * to implement what the cheevos module needs. */
+          bytes[0] = gb.read(id);
+          bytes[1] = gb.read(id + 1);
+          bytes[2] = gb.read(id + 2);
+          bytes[3] = gb.read(id + 3);
+          return bytes;
    }
 
    return 0;

libgambatte/src/gambatte.cpp

@@ -142,5 +142,11 @@ void GB::clearCheats() {
  p_->cpu.clearCheats();
 }
 
+#ifdef __LIBRETRO__
+unsigned char GB::read(unsigned p) const {
+ return p_->cpu.mem_.read(p, 0);
+}
+#endif
+
 }