[core] split off render layers

src/mbgl/renderer/render_layer.cpp

@@ -0,0 +1,25 @@
+#include <mbgl/renderer/render_layer.hpp>
+#include <mbgl/style/types.hpp>
+
+namespace mbgl {
+
+RenderLayer::RenderLayer(style::LayerType type_, const style::Layer::Impl& baseImpl_)
+        : type(type_), baseImpl(baseImpl_) {
+}
+
+const std::string& RenderLayer::getID() const {
+    return baseImpl.id;
+}
+
+bool RenderLayer::hasRenderPass(RenderPass pass) const {
+    return bool(passes & pass);
+}
+
+bool RenderLayer::needsRendering(float zoom) const {
+    return passes != RenderPass::None
+           && baseImpl.visibility != style::VisibilityType::None
+           && baseImpl.minZoom <= zoom
+           && baseImpl.maxZoom >= zoom;
+}
+
+}