1 files changed, 80 insertions, 0 deletions
diff --git a/src/video_core/shader/const_buffer_locker.h b/src/video_core/shader/const_buffer_locker.h
new file mode 100644
index 000000000..600e2f3c3
--- /dev/null
+++ b/src/video_core/shader/const_buffer_locker.h
@@ -0,0 +1,80 @@
+// Copyright 2019 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <unordered_map>
+#include "common/common_types.h"
+#include "common/hash.h"
+#include "video_core/engines/const_buffer_engine_interface.h"
+
+namespace VideoCommon::Shader {
+
+using KeyMap = std::unordered_map<std::pair<u32, u32>, u32, Common::PairHash>;
+using BoundSamplerMap = std::unordered_map<u32, Tegra::Engines::SamplerDescriptor>;
+using BindlessSamplerMap =
+    std::unordered_map<std::pair<u32, u32>, Tegra::Engines::SamplerDescriptor, Common::PairHash>;
+
+/**
+ * The ConstBufferLocker is a class use to interface the 3D and compute engines with the shader
+ * compiler. with it, the shader can obtain required data from GPU state and store it for disk
+ * shader compilation.
+ **/
+class ConstBufferLocker {
+public:
+    explicit ConstBufferLocker(Tegra::Engines::ShaderType shader_stage);
+
+    explicit ConstBufferLocker(Tegra::Engines::ShaderType shader_stage,
+                               Tegra::Engines::ConstBufferEngineInterface& engine);
+
+    ~ConstBufferLocker();
+
+    /// Retrieves a key from the locker, if it's registered, it will give the registered value, if
+    /// not it will obtain it from maxwell3d and register it.
+    std::optional<u32> ObtainKey(u32 buffer, u32 offset);
+
+    std::optional<Tegra::Engines::SamplerDescriptor> ObtainBoundSampler(u32 offset);
+
+    std::optional<Tegra::Engines::SamplerDescriptor> ObtainBindlessSampler(u32 buffer, u32 offset);
+
+    /// Inserts a key.
+    void InsertKey(u32 buffer, u32 offset, u32 value);
+
+    /// Inserts a bound sampler key.
+    void InsertBoundSampler(u32 offset, Tegra::Engines::SamplerDescriptor sampler);
+
+    /// Inserts a bindless sampler key.
+    void InsertBindlessSampler(u32 buffer, u32 offset, Tegra::Engines::SamplerDescriptor sampler);
+
+    /// Checks keys and samplers against engine's current const buffers. Returns true if they are
+    /// the same value, false otherwise;
+    bool IsConsistent() const;
+
+    /// Returns true if the keys are equal to the other ones in the locker.
+    bool HasEqualKeys(const ConstBufferLocker& rhs) const;
+
+    /// Gives an getter to the const buffer keys in the database.
+    const KeyMap& GetKeys() const {
+        return keys;
+    }
+
+    /// Gets samplers database.
+    const BoundSamplerMap& GetBoundSamplers() const {
+        return bound_samplers;
+    }
+
+    /// Gets bindless samplers database.
+    const BindlessSamplerMap& GetBindlessSamplers() const {
+        return bindless_samplers;
+    }
+
+private:
+    const Tegra::Engines::ShaderType stage;
+    Tegra::Engines::ConstBufferEngineInterface* engine = nullptr;
+    KeyMap keys;
+    BoundSamplerMap bound_samplers;
+    BindlessSamplerMap bindless_samplers;
+};
+
+} // namespace VideoCommon::Shader