1 files changed, 69 insertions, 0 deletions
diff --git a/benchmark/function/camera_function.benchmark.cpp b/benchmark/function/camera_function.benchmark.cpp
new file mode 100644
index 0000000000..965b004cb5
--- /dev/null
+++ b/benchmark/function/camera_function.benchmark.cpp
@@ -0,0 +1,69 @@
+#include <benchmark/benchmark.h>
+
+#include <mbgl/style/function/source_function.hpp>
+
+#include <mbgl/style/rapidjson_conversion.hpp>
+#include <mbgl/style/conversion.hpp>
+#include <mbgl/style/conversion/function.hpp>
+
+#include <rapidjson/document.h>
+
+
+using namespace mbgl;
+using namespace mbgl::style;
+
+static rapidjson::GenericDocument<rapidjson::UTF8<>, rapidjson::CrtAllocator> createFunctionJSON(size_t stopCount) {
+    rapidjson::GenericDocument<rapidjson::UTF8<>, rapidjson::CrtAllocator> doc;
+
+    std::string stops = "[";
+    for (size_t i = 0; i < stopCount; i++) {
+        std::string value = std::to_string(24.0f / stopCount * i);
+        if (stops.size() > 1) stops += ",";
+        stops += "[" + value + ", " + value + "]";
+    }
+    stops += "]";
+    
+    doc.Parse<0>(R"({"type": "exponential", "base": 2,  "stops": )" + stops + R"(, "property": "x"})");
+    return doc;
+}
+
+static void Parse_CameraFunction(benchmark::State& state) {
+    size_t stopCount = state.range(0);
+    
+    while (state.KeepRunning()) {
+        conversion::Error error;
+        state.PauseTiming();
+        auto doc = createFunctionJSON(stopCount);
+        state.ResumeTiming();
+        optional<CameraFunction<float>> result = conversion::convert<CameraFunction<float>, JSValue>(doc, error);
+        if (!result) {
+            state.SkipWithError(error.message.c_str());
+        }
+    }
+    state.SetLabel(std::to_string(stopCount).c_str());
+}
+
+static void Evaluate_CameraFunction(benchmark::State& state) {
+    size_t stopCount = state.range(0);
+    auto doc = createFunctionJSON(stopCount);
+    conversion::Error error;
+    optional<CameraFunction<float>> function = conversion::convert<CameraFunction<float>, JSValue>(doc, error);
+    if (!function) {
+        state.SkipWithError(error.message.c_str());
+    }
+    
+    while(state.KeepRunning()) {
+        float z = 24.0f * static_cast<float>(rand() % 100) / 100;
+        function->evaluate(z);
+    }
+    
+    state.SetLabel(std::to_string(stopCount).c_str());
+}
+
+BENCHMARK(Parse_CameraFunction)
+    ->Arg(1)->Arg(2)->Arg(4)->Arg(6)->Arg(8)->Arg(10)->Arg(12);
+
+BENCHMARK(Evaluate_CameraFunction)
+    ->Arg(1)->Arg(2)->Arg(4)->Arg(6)->Arg(8)->Arg(10)->Arg(12);
+
+