Add tracing entry points in the rendering pipelineupstream/galinelle_mbgl_tracing

This also includes a default tracing implementation that does not require
hooking into a platform instrumentation, but simply stores timestamps
into an array that can be dumped into a json file.

Among possible use cases, dumping such metrics to file in CI to detect
regressions of specific stages of the pipeline.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/mbgl/renderer/layers/render_hillshade_layer.cpp b/src/mbgl/renderer/layers/render_hillshade_layer.cpp
index b570d9c4c9..5549072319 100644
--- a/src/mbgl/renderer/layers/render_hillshade_layer.cpp
+++ b/src/mbgl/renderer/layers/render_hillshade_layer.cpp
@@ -13,6 +13,7 @@
 #include <mbgl/gfx/offscreen_texture.hpp>
 #include <mbgl/gfx/render_pass.hpp>
 #include <mbgl/util/geo.hpp>
+#include <mbgl/perf/runtime_metrics.hpp>
 
 namespace mbgl {
 
@@ -79,6 +80,7 @@ void RenderHillshadeLayer::render(PaintParameters& parameters) {
     assert(renderTiles);
     if (parameters.pass != RenderPass::Translucent && parameters.pass != RenderPass::Pass3D)
         return;
+    MBGL_TRACE_RENDERER_BEGIN(hillshade_layer);
     const auto& evaluated = static_cast<const HillshadeLayerProperties&>(*evaluatedProperties).evaluated;  
     auto draw = [&] (const mat4& matrix,
                      const auto& vertexBuffer,
@@ -221,9 +223,8 @@ void RenderHillshadeLayer::render(PaintParameters& parameters) {
                      });
             }
         }
-        
-
     }
+    MBGL_TRACE_RENDERER_END(hillshade_layer);
 }
 
 } // namespace mbgl