From 24796acccf698aead888bc942dad155f67bc1f4a Mon Sep 17 00:00:00 2001
From: Lior Halphon <LIJI32@gmail.com>
Date: Fri, 10 Jun 2022 23:51:06 +0300
Subject: [PATCH] MBC7 mouse control in SDL

---
 SDL/gui.c  | 37 ++++++++++++++++++++++++++++++-------
 SDL/gui.h  |  4 ++++
 SDL/main.c | 19 +++++++++++++++++++
 3 files changed, 53 insertions(+), 7 deletions(-)

diff --git a/SDL/gui.c b/SDL/gui.c
index e76177b..4b4ee7b 100644
--- a/SDL/gui.c
+++ b/SDL/gui.c
@@ -1155,9 +1155,20 @@ void connect_joypad(void)
     }
 }
 
+static void toggle_mouse_control(unsigned index)
+{
+    configuration.allow_mouse_controls = !configuration.allow_mouse_controls;
+}
+
+const char *mouse_control_string(unsigned index)
+{
+    return configuration.allow_mouse_controls? "Allow mouse control" : "Disallow mouse control";
+}
+
 static const struct menu_item controls_menu[] = {
     {"Keyboard Options", enter_keyboard_menu},
     {"Joypad Options", enter_joypad_menu},
+    {"Motion-controlled games:", toggle_mouse_control, mouse_control_string, toggle_mouse_control},
     {"Back", return_to_root_menu},
     {NULL,}
 };
@@ -1234,6 +1245,22 @@ static void toggle_audio_recording(unsigned index)
     }
 }
 
+void convert_mouse_coordinates(signed *x, signed *y)
+{
+    signed width = GB_get_screen_width(&gb);
+    signed height = GB_get_screen_height(&gb);
+    signed x_offset = (width - 160) / 2;
+    signed y_offset = (height - 144) / 2;
+
+    *x = (signed)(*x - rect.x / factor) * width / (signed)(rect.w / factor) - x_offset;
+    *y = (signed)(*y - rect.y / factor) * height / (signed)(rect.h / factor) - y_offset;
+
+    if (strcmp("CRT", configuration.filter) == 0) {
+        *y = *y * 8 / 7;
+        *y -= 144 / 16;
+    }
+}
+
 void run_gui(bool is_running)
 {
     SDL_ShowCursor(SDL_ENABLE);
@@ -1296,13 +1323,9 @@ void run_gui(bool is_running)
                         event.key.keysym.scancode = SDL_SCANCODE_ESCAPE;
                     }
                     else if (gui_state == SHOWING_MENU) {
-                        signed x = (event.button.x - rect.x / factor) * width / (rect.w / factor) - x_offset;
-                        signed y = (event.button.y - rect.y / factor) * height / (rect.h / factor) - y_offset;
-                        
-                        if (strcmp("CRT", configuration.filter) == 0) {
-                            y = y * 8 / 7;
-                            y -= 144 / 16;
-                        }
+                        signed x = event.button.x;
+                        signed y = event.button.y;
+                        convert_mouse_coordinates(&x, &y);
                         y += scroll;
                         
                         if (x < 0 || x >= 160 || y < 24) {
diff --git a/SDL/gui.h b/SDL/gui.h
index 1fe8a54..81a13bb 100644
--- a/SDL/gui.h
+++ b/SDL/gui.h
@@ -123,6 +123,9 @@ typedef struct {
     
     /* v0.14.4 */
     bool osd;
+    
+    /* v0.15 */
+    bool allow_mouse_controls;
 } configuration_t;
 
 extern configuration_t configuration;
@@ -149,5 +152,6 @@ void show_osd_text(const char *text);
 extern const char *osd_text;
 extern unsigned osd_countdown;
 extern unsigned osd_text_lines;
+void convert_mouse_coordinates(signed *x, signed *y);
 
 #endif
diff --git a/SDL/main.c b/SDL/main.c
index aa95a07..da8c40e 100644
--- a/SDL/main.c
+++ b/SDL/main.c
@@ -242,6 +242,25 @@ static void handle_events(GB_gameboy_t *gb)
                 }
                 break;
             }
+            case SDL_MOUSEBUTTONDOWN:
+            case SDL_MOUSEBUTTONUP: {
+                if (GB_has_accelerometer(gb) && configuration.allow_mouse_controls) {
+                    GB_set_key_state(gb, GB_KEY_A, event.type == SDL_MOUSEBUTTONDOWN);
+                }
+                break;
+            }
+                
+            case SDL_MOUSEMOTION: {
+                if (GB_has_accelerometer(gb) && configuration.allow_mouse_controls) {
+                    signed x = event.motion.x;
+                    signed y = event.motion.y;
+                    convert_mouse_coordinates(&x, &y);
+                    x = SDL_max(SDL_min(x, 160), 0);
+                    y = SDL_max(SDL_min(y, 144), 0);
+                    GB_set_accelerometer_values(gb, (x - 80) / -80.0, (y - 72) / -72.0);
+                }
+                break;
+            }
                 
             case SDL_JOYBUTTONUP:
             case SDL_JOYBUTTONDOWN: {