second implementation of multitap

add game/core option to enabled or disabled multitap.
Test with micro machine V3 and 5 devices, 2 multitap enabled, all
device react good i can’t test the 6 7 8 select player but i can select
8 gamer. The 2 multitap works fine.

i detect a bug, when we change the game pad type to analog, the library
crash, see it next time

4 files changed, 26 insertions, 14 deletions

diff --git a/frontend/libretro.c b/frontend/libretro.c
index 4486b95..361695c 100644
--- a/frontend/libretro.c
+++ b/frontend/libretro.c
@@ -58,8 +58,8 @@ int in_type[8];
 int in_analog_left[8][2] = {{ 127, 127 },{ 127, 127 },{ 127, 127 },{ 127, 127 },{ 127, 127 },{ 127, 127 },{ 127, 127 },{ 127, 127 }};
 int in_analog_right[8][2] = {{ 127, 127 },{ 127, 127 },{ 127, 127 },{ 127, 127 },{ 127, 127 },{ 127, 127 },{ 127, 127 },{ 127, 127 }};
 unsigned short in_keystate[8];
-int multitap1;
-int multitap2;
+int multitap1 = 0;
+int multitap2 = 0;
 int in_enable_vibration = 1;
 
 /* PSX max resolution is 640x512, but with enhancement it's 1024x512 */
diff --git a/frontend/plugin.c b/frontend/plugin.c
index d713452..cf93df8 100644
--- a/frontend/plugin.c
+++ b/frontend/plugin.c
@@ -49,10 +49,14 @@ extern void CALLBACK SPUasync(unsigned int, unsigned int);
 extern int  CALLBACK SPUplayCDDAchannel(short *, int);
 
 /* PAD */
-static long PADreadPort1(PadDataS *pad, int pad_index)
-{
+static long PADreadPort1(PadDataS *pad, int pad_index) {
     pad->controllerType = in_type[pad_index];
     pad->buttonStatus = ~in_keystate[pad_index];
+    if(multitap1==1){
+    	pad->portMultitap=1;
+    }else{
+    	pad->portMultitap=0;
+    }
     if (in_type[pad_index] == PSE_PAD_TYPE_ANALOGPAD || in_type[pad_index] == PSE_PAD_TYPE_NEGCON) {
         pad->leftJoyX = in_analog_left[pad_index][0];
         pad->leftJoyY = in_analog_left[pad_index][1];
@@ -62,15 +66,19 @@ static long PADreadPort1(PadDataS *pad, int pad_index)
     return 0;
 }
 
-static long PADreadPort2(PadDataS *pad)
-{
-    pad->controllerType = in_type[4];
-    pad->buttonStatus = ~in_keystate[4];
-    if (in_type[4] == PSE_PAD_TYPE_ANALOGPAD || in_type[4] == PSE_PAD_TYPE_NEGCON) {
-        pad->leftJoyX = in_analog_left[4][0];
-        pad->leftJoyY = in_analog_left[4][1];
-        pad->rightJoyX = in_analog_right[4][0];
-        pad->rightJoyY = in_analog_right[4][1];
+static long PADreadPort2(PadDataS *pad, int pad_index) {
+	pad->controllerType = in_type[pad_index];
+    pad->buttonStatus = ~in_keystate[pad_index];
+    if(multitap2==1){
+    	pad->portMultitap=2;
+    }else{
+    	pad->portMultitap=0;
+    }
+    if (in_type[pad_index] == PSE_PAD_TYPE_ANALOGPAD || in_type[pad_index] == PSE_PAD_TYPE_NEGCON) {
+        pad->leftJoyX = in_analog_left[pad_index][0];
+        pad->leftJoyY = in_analog_left[pad_index][1];
+        pad->rightJoyX = in_analog_right[pad_index][0];
+        pad->rightJoyY = in_analog_right[pad_index][1];
     }
     return 0;
 }
diff --git a/frontend/plugin_lib.c b/frontend/plugin_lib.c
index ff3518e..ad2f49b 100644
--- a/frontend/plugin_lib.c
+++ b/frontend/plugin_lib.c
@@ -37,6 +37,8 @@
 #define HUD_HEIGHT 10
 
 int in_type[8];
+int multitap1;
+int multitap2;
 int in_analog_left[8][2] = {{ 127, 127 },{ 127, 127 },{ 127, 127 },{ 127, 127 },{ 127, 127 },{ 127, 127 },{ 127, 127 },{ 127, 127 }};
 int in_analog_right[8][2] = {{ 127, 127 },{ 127, 127 },{ 127, 127 },{ 127, 127 },{ 127, 127 },{ 127, 127 },{ 127, 127 },{ 127, 127 }};
 int in_adev[2] = { -1, -1 }, in_adev_axis[2][2] = {{ 0, 1 }, { 0, 1 }};
diff --git a/frontend/plugin_lib.h b/frontend/plugin_lib.h
index 50fcf9e..ad27fc2 100644
--- a/frontend/plugin_lib.h
+++ b/frontend/plugin_lib.h
@@ -17,8 +17,10 @@ enum {
 	DKEY_CROSS,
 	DKEY_SQUARE,
 };
-extern int  in_state_gun;
+extern int in_state_gun;
 extern int in_type[8];
+extern int multitap1;
+extern int multitap2;
 extern int in_analog_left[8][2];
 extern int in_analog_right[8][2];
 unsigned short in_keystate[8];