add option to open window on another monitor

src/renderer.cpp

@@ -26,6 +26,7 @@
 #define CLEAR_COL_G 135.f / 255.f
 #define CLEAR_COL_B 135.f / 255.f
 #define CLEAR_COL_A 1.f
+#define USE_SECOND_MONITOR 1
 
 // TODO: add this to json scene properties and render_state
 util_RGBA g_clear_col = {1.f,1.f,1.f,1.f};
@@ -49,9 +50,19 @@ renInit(render_state* rs)
 	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
 	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
 	SDL_GetCurrentDisplayMode(0, &rs->handles.currentDisplayMode);
-	rs->handles.window =
-		SDL_CreateWindow("hexgame", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
-							rs->viewport_dims.x, rs->viewport_dims.y, SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE);
+
+	uint display_id = 0;
+	if (USE_SECOND_MONITOR && SDL_GetNumVideoDisplays() > 1)
+		display_id = 1;
+
+	rs->handles.window = SDL_CreateWindow(
+		"hexgame",
+		SDL_WINDOWPOS_CENTERED_DISPLAY(display_id),
+		SDL_WINDOWPOS_CENTERED_DISPLAY(display_id),
+		rs->viewport_dims.x,
+		rs->viewport_dims.y,
+		SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE
+	);
 
 	if (!rs->handles.window) {
 		LOG(ERROR) << "Error creating window: " << SDL_GetError() << "\n";