upload all GL objects before rendering a frame

This moves all texture updates and buffer uploads to the beginning of every frame, before we issue any drawing commands. This means the GPU typically has much more time to upload the data in the background until we actually need it, and doesn't have to pause to store/load the framebuffer.

1 files changed, 5 insertions, 2 deletions

diff --git a/src/mbgl/geometry/sprite_atlas.hpp b/src/mbgl/geometry/sprite_atlas.hpp
index 079c15cefd..5605143104 100644
--- a/src/mbgl/geometry/sprite_atlas.hpp
+++ b/src/mbgl/geometry/sprite_atlas.hpp
@@ -50,10 +50,13 @@ public:
 
     SpriteAtlasPosition getPosition(const std::string& name, bool repeating = false);
 
-    // Binds the image buffer of this sprite atlas to the GPU, and uploads data if it is out
-    // of date.
+    // Binds the atlas texture to the GPU, and uploads data if it is out of date.
     void bind(bool linear = false);
 
+    // Uploads the texture to the GPU to be available when we need it. This is a lazy operation;
+    // the texture is only bound when the data is out of date (=dirty).
+    void upload();
+
     inline float getWidth() const { return width; }
     inline float getHeight() const { return height; }
     inline float getTextureWidth() const { return width * pixelRatio; }