Uniform buffer objects (#1127)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

include/mbgl/gl/uniform_buffer_gl.hpp

@@ -0,0 +1,49 @@
+#pragma once
+
+#include <mbgl/gfx/uniform_buffer.hpp>
+#include <mbgl/gl/types.hpp>
+
+namespace mbgl {
+namespace gl {
+
+class UniformBufferGL final : public gfx::UniformBuffer {
+public:
+    UniformBufferGL(const void* data, std::size_t size_);
+    UniformBufferGL(const UniformBufferGL& other)
+        : UniformBuffer(other) {}
+    UniformBufferGL(UniformBufferGL&& other)
+        : UniformBuffer(std::move(other)) {}
+
+    BufferID getID() const { return id; }
+
+protected:
+    BufferID id = 0;
+};
+
+/// Stores a collection of uniform buffers by name
+class UniformBufferArrayGL final : public gfx::UniformBufferArray {
+public:
+    UniformBufferArrayGL(int initCapacity = 10)
+        : UniformBufferArray(initCapacity) {}
+    UniformBufferArrayGL(UniformBufferArrayGL&& other)
+        : UniformBufferArray(std::move(other)) {}
+    UniformBufferArrayGL(const UniformBufferArrayGL&) = delete;
+
+    UniformBufferArrayGL& operator=(UniformBufferArrayGL&& other) {
+        UniformBufferArray::operator=(std::move(other));
+        return *this;
+    }
+    UniformBufferArrayGL& operator=(const UniformBufferArrayGL& other) {
+        UniformBufferArray::operator=(other);
+        return *this;
+    }
+
+private:
+    std::unique_ptr<gfx::UniformBuffer> copy(const gfx::UniformBuffer& uniformBuffers) override {
+        return std::unique_ptr<gfx::UniformBuffer>(
+            new UniformBufferGL(static_cast<const UniformBufferGL&>(uniformBuffers)));
+    }
+};
+
+} // namespace gl
+} // namespace mbgl