GPU: Implement guest driver profile and deduce texture handler sizes.

src/video_core/guest_driver.h

@@ -0,0 +1,37 @@
+// Copyright 2019 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <vector>
+
+#include "common/common_types.h"
+
+namespace VideoCore {
+
+/**
+ * The GuestDriverProfile class is used to learn about the GPU drivers behavior and collect
+ * information necessary for impossible to avoid HLE methods like shader tracks.
+ */
+class GuestDriverProfile {
+public:
+    u32 GetTextureHandlerSize() const {
+        return texture_handler_size;
+    }
+
+    bool TextureHandlerSizeKnown() const {
+        return texture_handler_size_deduced;
+    }
+
+    void DeduceTextureHandlerSize(std::vector<u32>&& bound_offsets);
+
+private:
+    // This goes with Vulkan and OpenGL standards but Nvidia GPUs can easily
+    // use 4 bytes instead. Thus, certain drivers may squish the size.
+    static constexpr u32 default_texture_handler_size = 8;
+    u32 texture_handler_size{default_texture_handler_size};
+    bool texture_handler_size_deduced{};
+};
+
+} // namespace VideoCore