[core] add gfx::CommandEncoder::present()

src/mbgl/gfx/command_encoder.hpp

@@ -9,6 +9,7 @@ namespace gfx {
 
 class RenderPassDescriptor;
 class RenderPass;
+class Renderable;
 
 class CommandEncoder {
 protected:
@@ -28,6 +29,7 @@ public:
     }
 
     virtual std::unique_ptr<RenderPass> createRenderPass(const char* name, const RenderPassDescriptor&) = 0;
+    virtual void present(Renderable&) = 0;
 };
 
 } // namespace gfx

src/mbgl/gl/command_encoder.cpp

@@ -1,6 +1,7 @@
 #include <mbgl/gl/command_encoder.hpp>
 #include <mbgl/gl/render_pass.hpp>
 #include <mbgl/gl/context.hpp>
+#include <mbgl/gl/renderable_resource.hpp>
 #include <mbgl/gl/debugging_extension.hpp>
 #include <mbgl/platform/gl_functions.hpp>
 
@@ -19,6 +20,10 @@ CommandEncoder::createRenderPass(const char* name, const gfx::RenderPassDescript
     return std::make_unique<gl::RenderPass>(*this, name, descriptor);
 }
 
+void CommandEncoder::present(gfx::Renderable& renderable) {
+    renderable.getResource<gl::RenderableResource>().swap();
+}
+
 void CommandEncoder::pushDebugGroup(const char* name) {
     (void)name;
 #ifndef NDEBUG

src/mbgl/gl/command_encoder.hpp

@@ -18,6 +18,7 @@ public:
     friend class RenderPass;
 
     std::unique_ptr<gfx::RenderPass> createRenderPass(const char* name, const gfx::RenderPassDescriptor&) override;
+    void present(gfx::Renderable&) override;
 
 private:
     void pushDebugGroup(const char* name) override;

src/mbgl/renderer/renderer_impl.cpp

@@ -493,6 +493,10 @@ void Renderer::Impl::render(const UpdateParameters& updateParameters) {
         observer->onDidFinishRenderingMap();
     }
 
+    if (updateParameters.mode == MapMode::Continuous) {
+        parameters.encoder->present(parameters.backend.getDefaultRenderable());
+    }
+
     // CommandEncoder destructor submits render commands.
 }