From 1a58f45d76fe7756dd365e099d1536da769c1eab Mon Sep 17 00:00:00 2001
From: Fernando Sahmkow <fsahmkow27@gmail.com>
Date: Mon, 23 Sep 2019 14:02:02 -0400
Subject: VideoCore: Unify const buffer accessing along engines and provide
 ConstBufferLocker class to shaders.

---
 src/video_core/shader/const_buffer_locker.h | 50 +++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 src/video_core/shader/const_buffer_locker.h

(limited to 'src/video_core/shader/const_buffer_locker.h')

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..39e62584d
--- /dev/null
+++ b/src/video_core/shader/const_buffer_locker.h
@@ -0,0 +1,50 @@
+// 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 {
+
+class ConstBufferLocker {
+public:
+    explicit ConstBufferLocker(Tegra::Engines::ShaderType shader_stage);
+
+    explicit ConstBufferLocker(Tegra::Engines::ShaderType shader_stage,
+                               Tegra::Engines::ConstBufferEngineInterface* engine);
+
+    // Checks if an engine is setup, it may be possible that during disk shader
+    // cache run, the engines have not been created yet.
+    bool IsEngineSet() const;
+
+    // Use this to set/change the engine used for this shader.
+    void SetEngine(Tegra::Engines::ConstBufferEngineInterface* engine);
+
+    // 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);
+
+    // Manually inserts a key.
+    void InsertKey(u32 buffer, u32 offset, u32 value);
+
+    // Retrieves the number of keys registered.
+    u32 NumKeys() const;
+
+    // Gives an accessor to the key's database.
+    const std::unordered_map<std::pair<u32, u32>, u32, Common::PairHash>& AccessKeys() const;
+
+    // Checks keys against maxwell3d's current const buffers. Returns true if they
+    // are the same value, false otherwise;
+    bool AreKeysConsistant() const;
+
+private:
+    Tegra::Engines::ConstBufferEngineInterface* engine;
+    Tegra::Engines::ShaderType shader_stage;
+    std::unordered_map<std::pair<u32, u32>, u32, Common::PairHash> keys{};
+};
+} // namespace VideoCommon::Shader
-- 
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