From abece0b1697f06cab39d8f9af6ca3f7479045fe8 Mon Sep 17 00:00:00 2001
From: Andre Leiradella <andre@leiradella.com>
Date: Sun, 8 May 2016 23:22:22 -0300
Subject: [PATCH] added a spetacular hack to support cheevos

---
 libgambatte/include/gambatte.h    |  4 ++++
 libgambatte/libretro/libretro.cpp | 13 +++++++++++++
 libgambatte/src/gambatte.cpp      |  6 ++++++
 3 files changed, 23 insertions(+)

diff --git a/libgambatte/include/gambatte.h b/libgambatte/include/gambatte.h
index 1f85e42..068401c 100644
--- a/libgambatte/include/gambatte.h
+++ b/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;
diff --git a/libgambatte/libretro/libretro.cpp b/libgambatte/libretro/libretro.cpp
index 23a87f1..0298a5c 100644
--- a/libgambatte/libretro/libretro.cpp
+++ b/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;
diff --git a/libgambatte/src/gambatte.cpp b/libgambatte/src/gambatte.cpp
index 80c4899..fc75db3 100644
--- a/libgambatte/src/gambatte.cpp
+++ b/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
+
 }