From 129361836f9043348f17e1a3fd3db0b60579db0b Mon Sep 17 00:00:00 2001
From: Alexander Batalov <alex.batalov@gmail.com>
Date: Thu, 20 Apr 2023 10:31:32 +0300
Subject: [PATCH] Add op_get_mouse_buttons

---
 src/mouse.cc         | 17 +++++++++++------
 src/mouse.h          |  1 +
 src/sfall_opcodes.cc |  9 +++++++++
 3 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/src/mouse.cc b/src/mouse.cc
index 09e4334..6e8a8bb 100644
--- a/src/mouse.cc
+++ b/src/mouse.cc
@@ -54,7 +54,7 @@ static unsigned char* _mouse_fptr = NULL;
 static double gMouseSensitivity = 1.0;
 
 // 0x51E2AC
-static int gMouseButtonsState = 0;
+static int last_buttons = 0;
 
 // 0x6AC790
 static bool gCursorIsHidden;
@@ -415,7 +415,7 @@ void _mouse_info()
         }
         x = 0;
         y = 0;
-        buttons = gMouseButtonsState;
+        buttons = last_buttons;
     }
 
     _mouse_simulate_input(x, y, buttons);
@@ -447,7 +447,7 @@ void _mouse_simulate_input(int delta_x, int delta_y, int buttons)
         return;
     }
 
-    if (delta_x || delta_y || buttons != gMouseButtonsState) {
+    if (delta_x || delta_y || buttons != last_buttons) {
         if (gVcrState == 0) {
             if (_vcr_buffer_index == VCR_BUFFER_CAPACITY - 1) {
                 vcrDump();
@@ -464,13 +464,13 @@ void _mouse_simulate_input(int delta_x, int delta_y, int buttons)
             _vcr_buffer_index++;
         }
     } else {
-        if (gMouseButtonsState == 0) {
+        if (last_buttons == 0) {
             if (!_mouse_idling) {
                 _mouse_idle_start_time = getTicks();
                 _mouse_idling = 1;
             }
 
-            gMouseButtonsState = 0;
+            last_buttons = 0;
             _raw_buttons = 0;
             gMouseEvent = 0;
 
@@ -479,7 +479,7 @@ void _mouse_simulate_input(int delta_x, int delta_y, int buttons)
     }
 
     _mouse_idling = 0;
-    gMouseButtonsState = buttons;
+    last_buttons = buttons;
     previousEvent = gMouseEvent;
     gMouseEvent = 0;
 
@@ -703,4 +703,9 @@ void convertMouseWheelToArrowKey(int* keyCodePtr)
     }
 }
 
+int mouse_get_last_buttons()
+{
+    return last_buttons;
+}
+
 } // namespace fallout
diff --git a/src/mouse.h b/src/mouse.h
index 6b091c5..667250f 100644
--- a/src/mouse.h
+++ b/src/mouse.h
@@ -52,6 +52,7 @@ void mouseGetPositionInWindow(int win, int* x, int* y);
 bool mouseHitTestInWindow(int win, int left, int top, int right, int bottom);
 void mouseGetWheel(int* x, int* y);
 void convertMouseWheelToArrowKey(int* keyCodePtr);
+int mouse_get_last_buttons();
 
 } // namespace fallout
 
diff --git a/src/sfall_opcodes.cc b/src/sfall_opcodes.cc
index f918d79..d21acb6 100644
--- a/src/sfall_opcodes.cc
+++ b/src/sfall_opcodes.cc
@@ -396,6 +396,14 @@ static void opGetMouseY(Program* program)
     programStackPushInteger(program, y);
 }
 
+// get_mouse_buttons
+static void op_get_mouse_buttons(Program* program)
+{
+    // CE: Implementation is slightly different - it does not handle middle
+    // mouse button.
+    programStackPushInteger(program, mouse_get_last_buttons());
+}
+
 // get_screen_width
 static void opGetScreenWidth(Program* program)
 {
@@ -540,6 +548,7 @@ void sfallOpcodesInit()
     interpreterRegisterOpcode(0x821A, opSetWeaponAmmoCount);
     interpreterRegisterOpcode(0x821C, opGetMouseX);
     interpreterRegisterOpcode(0x821D, opGetMouseY);
+    interpreterRegisterOpcode(0x821E, op_get_mouse_buttons);
     interpreterRegisterOpcode(0x8220, opGetScreenWidth);
     interpreterRegisterOpcode(0x8221, opGetScreenHeight);
     interpreterRegisterOpcode(0x8237, opParseInt);