From 98d6ac2577a15fd709f827913da15f8b249f6725 Mon Sep 17 00:00:00 2001
From: TheBrokenRail <connor24nolan@live.com>
Date: Tue, 6 Oct 2020 09:35:47 -0400
Subject: [PATCH] Mouse Scroll In GLFW

---
 mods/src/compat.c | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/mods/src/compat.c b/mods/src/compat.c
index 6a987b08..ee70c16a 100644
--- a/mods/src/compat.c
+++ b/mods/src/compat.c
@@ -202,18 +202,33 @@ static void glfw_motion(__attribute__((unused)) GLFWwindow *window, double xpos,
     SDL_PushEvent(&event);
 }
 
-// Pass Mouse Click To SDL
-static void glfw_click(__attribute__((unused)) GLFWwindow *window, int button, int action, __attribute__((unused)) int mods) {
-    int up = action == GLFW_RELEASE;
+// Create And Push SDL Mouse Click Event
+static void click(int button, int up) {
     SDL_Event event;
     event.type = up ? SDL_MOUSEBUTTONUP : SDL_MOUSEBUTTONDOWN;
     event.button.x = last_mouse_x;
     event.button.y = last_mouse_y;
     event.button.state = up ? SDL_RELEASED : SDL_PRESSED;
-    event.button.button = button == GLFW_MOUSE_BUTTON_RIGHT ? SDL_BUTTON_RIGHT : (button == GLFW_MOUSE_BUTTON_LEFT ? SDL_BUTTON_LEFT : SDL_BUTTON_MIDDLE);
+    event.button.button = button;
     SDL_PushEvent(&event);
 }
 
+// Pass Mouse Click To SDL
+static void glfw_click(__attribute__((unused)) GLFWwindow *window, int button, int action, __attribute__((unused)) int mods) {
+    int up = action == GLFW_RELEASE;
+    int sdl_button = button == GLFW_MOUSE_BUTTON_RIGHT ? SDL_BUTTON_RIGHT : (button == GLFW_MOUSE_BUTTON_LEFT ? SDL_BUTTON_LEFT : SDL_BUTTON_MIDDLE);
+    click(sdl_button, up);
+}
+
+// Pass Mouse Scroll To SDL
+static void glfw_scroll(__attribute__((unused)) GLFWwindow *window, __attribute__((unused)) double xoffset, double yoffset) {
+    if (yoffset != 0) {
+        int sdl_button = yoffset > 0 ? SDL_BUTTON_WHEELUP : SDL_BUTTON_WHEELDOWN;
+        click(sdl_button, 0);
+        click(sdl_button, 1);
+    }
+}
+
 // Init GLFW
 HOOK(SDL_WM_SetCaption, void, (const char *title, __attribute__((unused)) const char *icon)) {
     FreeImage_Initialise(0);
@@ -240,6 +255,7 @@ HOOK(SDL_WM_SetCaption, void, (const char *title, __attribute__((unused)) const
     glfwSetCharCallback(glfw_window, glfw_char);
     glfwSetCursorPosCallback(glfw_window, glfw_motion);
     glfwSetMouseButtonCallback(glfw_window, glfw_click);
+    glfwSetScrollCallback(glfw_window, glfw_scroll);
 
     store_x11_window();