From 6f1070cccd4fb9731d3fda8b1c236245a9e3a694 Mon Sep 17 00:00:00 2001
From: Nadia Pedersen <nadia@nhp.sh>
Date: Sun, 3 Jun 2018 00:21:43 +0200
Subject: [PATCH] SDL: Add controller hat support in-game and in the GUI.

---
 SDL/gui.c  | 17 +++++++++++++++++
 SDL/main.c | 15 +++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/SDL/gui.c b/SDL/gui.c
index 86517647..3e0151b6 100644
--- a/SDL/gui.c
+++ b/SDL/gui.c
@@ -729,6 +729,23 @@ void run_gui(bool is_running)
                     else if (event.jbutton.button == SDL_CONTROLLER_BUTTON_DPAD_LEFT) event.key.keysym.scancode = SDL_SCANCODE_LEFT;
                     else if (event.jbutton.button == SDL_CONTROLLER_BUTTON_DPAD_RIGHT) event.key.keysym.scancode = SDL_SCANCODE_RIGHT;
                     break;
+
+                case SDL_JOYHATMOTION: {
+                    uint8_t value = event.jhat.value;
+                    if (value != 0) {
+                        uint32_t scancode =
+                            value == SDL_HAT_UP ? SDL_SCANCODE_UP
+                            : value == SDL_HAT_DOWN ? SDL_SCANCODE_DOWN
+                            : value == SDL_HAT_LEFT ? SDL_SCANCODE_LEFT
+                            : value == SDL_HAT_RIGHT ? SDL_SCANCODE_RIGHT
+                            : 0;
+
+                        if (scancode != 0) {
+                            event.type = SDL_KEYDOWN;
+                            event.key.keysym.scancode = scancode;
+                        }
+                    }
+               }
                     
                 case SDL_JOYAXISMOTION: {
                     static bool axis_active[2] = {false, false};
diff --git a/SDL/main.c b/SDL/main.c
index e25c7b28..f3ee39e7 100755
--- a/SDL/main.c
+++ b/SDL/main.c
@@ -165,6 +165,21 @@ static void handle_events(GB_gameboy_t *gb)
                     GB_set_key_state(gb, GB_KEY_LEFT, event.jaxis.value < -0x4000);
                 }
             break;
+
+            case SDL_JOYHATMOTION:
+            {
+                uint8_t value = event.jhat.value;
+                int8_t updown =
+                    value == SDL_HAT_LEFTUP || value == SDL_HAT_UP || value == SDL_HAT_RIGHTUP ? -1 : (value == SDL_HAT_LEFTDOWN || value == SDL_HAT_DOWN || value == SDL_HAT_RIGHTDOWN ? 1 : 0);
+                int8_t leftright =
+                    value == SDL_HAT_LEFTUP || value == SDL_HAT_LEFT || value == SDL_HAT_LEFTDOWN ? -1 : (value == SDL_HAT_RIGHTUP || value == SDL_HAT_RIGHT || value == SDL_HAT_RIGHTDOWN ? 1 : 0);
+                
+                GB_set_key_state(gb, GB_KEY_LEFT, leftright == -1);
+                GB_set_key_state(gb, GB_KEY_RIGHT, leftright == 1);
+                GB_set_key_state(gb, GB_KEY_UP, updown == -1);
+                GB_set_key_state(gb, GB_KEY_DOWN, updown == 1);
+                break;
+           };
                 
             case SDL_KEYDOWN:
                 switch (event.key.keysym.scancode) {