Add Ctrl-- and Ctrl-= for zooming in and out.

src/app/RackScrollWidget.cpp

@@ -21,6 +21,9 @@ RackScrollWidget::RackScrollWidget() {
 }
 
 void RackScrollWidget::step() {
+	// Clamp zoom
+	settings::zoom = math::clamp(settings::zoom, 0.25f, 2.f);
+	// Round zoom to nearest percent
 	float zoom = std::round(settings::zoom / 0.01) * 0.01;
 	if (zoom != zoomWidget->zoom) {
 		// Set offset based on zoomPos
@@ -102,7 +105,6 @@ void RackScrollWidget::onHoverScroll(const event::HoverScroll &e) {
 		if (settings::invertZoom)
 			zoomDelta *= -1;
 		settings::zoom *= std::pow(2, zoomDelta);
-		settings::zoom = math::clamp(settings::zoom, 0.25f, 2.f);
 		zoomPos = e.pos;
 		e.consume(this);
 		return;

src/app/Scene.cpp

@@ -120,6 +120,24 @@ void Scene::onHoverKey(const event::HoverKey &e) {
 					e.consume(this);
 				}
 			} break;
+			case GLFW_KEY_MINUS: {
+				if ((e.mods & WINDOW_MOD_MASK) == WINDOW_MOD_CTRL) {
+					float z = std::log2(settings::zoom);
+					z *= 2;
+					z = std::ceil(z - 0.01) - 1;
+					z /= 2;
+					settings::zoom = std::pow(2, z);
+				}
+			} break;
+			case GLFW_KEY_EQUAL: {
+				if ((e.mods & WINDOW_MOD_MASK) == WINDOW_MOD_CTRL) {
+					float z = std::log2(settings::zoom);
+					z *= 2;
+					z = std::floor(z + 0.01) + 1;
+					z /= 2;
+					settings::zoom = std::pow(2, z);
+				}
+			} break;
 			case GLFW_KEY_ENTER:
 			case GLFW_KEY_KP_ENTER: {
 				moduleBrowser->show();