feat: add mouse click input - entity selection in scene panel

Demo/editor_main.c

@@ -124,6 +124,9 @@ static int g_selected = 2;
 static char g_console_lines[32][256];
 static int g_console_count = 0;
 static char g_file_path[512] = "untitled.ly";
+static int g_mouse_x = 0, g_mouse_y = 0;
+static int g_mouse_click = 0;
+static int g_mouse_click_x = 0, g_mouse_click_y = 0;
 
 static void console_add(const char* msg) {
     if (g_console_count >= 32) {
@@ -135,6 +138,38 @@ static void console_add(const char* msg) {
     g_console_count++;
 }
 
+static void on_mouse_move(int x, int y) {
+    g_mouse_x = x; g_mouse_y = y;
+}
+
+static void on_mouse_button(int button) {
+    if (button == 0) {
+        if (g_mouse_click == 0) {
+            g_mouse_click = 1;
+            g_mouse_click_x = g_mouse_x;
+            g_mouse_click_y = g_mouse_y;
+        }
+    }
+}
+
+static void process_click(void) {
+    if (!g_mouse_click) return;
+    g_mouse_click = 0;
+    int cx = g_mouse_click_x, cy = g_mouse_click_y;
+    float pw = 220, mh = 28, th = 28, sh2 = 22, ch = 180;
+    if (cx >= 0 && cx <= (int)pw && cy >= (int)(mh + th)) {
+        for (int i = 0; i < g_entity_count; i++) {
+            float ey = 60 + i * 22;
+            if (cy >= (int)ey - 4 && cy <= (int)ey + 18) {
+                g_selected = i;
+                char buf[128]; snprintf(buf, sizeof(buf), "Selected: %s", g_entities[i].name);
+                console_add(buf);
+                return;
+            }
+        }
+    }
+}
+
 static void save_ly(const char* path) {
     FILE* f = fopen(path, "w");
     if (!f) { console_add("ERROR: save failed"); return; }
@@ -191,6 +226,7 @@ static void init_default_scene(void) {
 
 static void on_render(Engine* engine) {
     if (!g_dev) return;
+    process_click();
     ID3D11DeviceContext* ctx = g_dev->context;
     float sw = (float)g_dev->width, sh = (float)g_dev->height;
 
@@ -321,6 +357,8 @@ int WINAPI WinMain(HINSTANCE hI, HINSTANCE hP, LPSTR cmd, int nS) {
 
     engine_set_render_callback(engine, on_render);
     engine_set_key_callback(engine, on_key);
+    window_set_mouse_move_callback(engine->window, on_mouse_move);
+    window_set_mouse_button_callback(engine->window, on_mouse_button);
     engine_run(engine);
 
     if(g_tex_layout)g_tex_layout->lpVtbl->Release(g_tex_layout);