[core] Enable dynamic updates of index buffers.

1 files changed, 11 insertions, 3 deletions

diff --git a/src/mbgl/gl/context.hpp b/src/mbgl/gl/context.hpp
index 528113cbba..0ef6bc1a3a 100644
--- a/src/mbgl/gl/context.hpp
+++ b/src/mbgl/gl/context.hpp
@@ -75,11 +75,18 @@ public:
     }
 
     template <class DrawMode>
-    IndexBuffer<DrawMode> createIndexBuffer(IndexVector<DrawMode>&& v) {
+    IndexBuffer<DrawMode> createIndexBuffer(IndexVector<DrawMode>&& v, const BufferUsage usage=BufferUsage::StaticDraw) {
         return IndexBuffer<DrawMode> {
-            createIndexBuffer(v.data(), v.byteSize())
+            v.indexSize(),
+            createIndexBuffer(v.data(), v.byteSize(), usage)
         };
     }
+    
+    template <class DrawMode>
+    void updateIndexBuffer(IndexBuffer<DrawMode>& buffer, IndexVector<DrawMode>&& v) {
+        assert(v.indexSize() == buffer.indexCount);
+        updateIndexBuffer(buffer.buffer, v.data(), v.byteSize());
+    }
 
     template <RenderbufferType type>
     Renderbuffer<type> createRenderbuffer(const Size size) {
@@ -250,7 +257,8 @@ private:
 
     UniqueBuffer createVertexBuffer(const void* data, std::size_t size, const BufferUsage usage);
     void updateVertexBuffer(UniqueBuffer& buffer, const void* data, std::size_t size);
-    UniqueBuffer createIndexBuffer(const void* data, std::size_t size);
+    UniqueBuffer createIndexBuffer(const void* data, std::size_t size, const BufferUsage usage);
+    void updateIndexBuffer(UniqueBuffer& buffer, const void* data, std::size_t size);
     UniqueTexture createTexture(Size size, const void* data, TextureFormat, TextureUnit);
     void updateTexture(TextureID, Size size, const void* data, TextureFormat, TextureUnit);
     UniqueFramebuffer createFramebuffer();