From 468bd9c1b0f9e74f7c096b127a94a94e4ed7caec Mon Sep 17 00:00:00 2001
From: David Marcec <dmarcecguzman@gmail.com>
Date: Fri, 10 Jul 2020 13:36:38 +1000
Subject: async shaders

---
 src/video_core/shader/async_shaders.h | 107 ++++++++++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 src/video_core/shader/async_shaders.h

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

diff --git a/src/video_core/shader/async_shaders.h b/src/video_core/shader/async_shaders.h
new file mode 100644
index 000000000..26bc38326
--- /dev/null
+++ b/src/video_core/shader/async_shaders.h
@@ -0,0 +1,107 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <deque>
+#include <memory>
+#include <shared_mutex>
+#include <thread>
+#include "common/bit_field.h"
+#include "common/common_types.h"
+#include "video_core/renderer_opengl/gl_device.h"
+#include "video_core/renderer_opengl/gl_resource_manager.h"
+#include "video_core/renderer_opengl/gl_shader_decompiler.h"
+
+namespace Core::Frontend {
+class EmuWindow;
+class GraphicsContext;
+} // namespace Core::Frontend
+
+namespace Tegra {
+class GPU;
+}
+
+namespace VideoCommon::Shader {
+
+class AsyncShaders {
+public:
+    enum class Backend {
+        OpenGL,
+        GLASM,
+    };
+
+    struct ResultPrograms {
+        OpenGL::OGLProgram opengl;
+        OpenGL::OGLAssemblyProgram glasm;
+    };
+
+    struct Result {
+        u64 uid;
+        VAddr cpu_address;
+        Backend backend;
+        ResultPrograms program;
+        std::vector<u64> code;
+        std::vector<u64> code_b;
+        Tegra::Engines::ShaderType shader_type;
+    };
+
+    explicit AsyncShaders(Core::Frontend::EmuWindow& emu_window);
+    ~AsyncShaders();
+
+    /// Start up shader worker threads
+    void AllocateWorkers(std::size_t num_workers);
+
+    /// Clear the shader queue and kill all worker threads
+    void FreeWorkers();
+
+    // Force end all threads
+    void KillWorkers();
+
+    /// Check our worker queue to see if we have any work queued already
+    bool HasWorkQueued();
+
+    /// Check to see if any shaders have actually been compiled
+    bool HasCompletedWork();
+
+    /// Deduce if a shader can be build on another thread of MUST be built in sync. We cannot build
+    /// every shader async as some shaders are only built and executed once. We try to "guess" which
+    /// shader would be used only once
+    bool IsShaderAsync(const Tegra::GPU& gpu) const;
+
+    /// Pulls completed compiled shaders
+    std::vector<Result> GetCompletedWork();
+
+    void QueueOpenGLShader(const OpenGL::Device& device, Tegra::Engines::ShaderType shader_type,
+                           u64 uid, std::vector<u64> code, std::vector<u64> code_b, u32 main_offset,
+                           VideoCommon::Shader::CompilerSettings compiler_settings,
+                           const VideoCommon::Shader::Registry& registry, VAddr cpu_addr);
+
+private:
+    void ShaderCompilerThread(Core::Frontend::GraphicsContext* context);
+
+    struct WorkerParams {
+        AsyncShaders::Backend backend;
+        OpenGL::Device device;
+        Tegra::Engines::ShaderType shader_type;
+        u64 uid;
+        std::vector<u64> code;
+        std::vector<u64> code_b;
+        u32 main_offset;
+        VideoCommon::Shader::CompilerSettings compiler_settings;
+        VideoCommon::Shader::Registry registry;
+        VAddr cpu_address;
+    };
+
+    std::shared_mutex queue_mutex;
+    std::shared_mutex completed_mutex;
+    std::atomic<bool> is_thread_exiting{};
+    std::vector<std::unique_ptr<Core::Frontend::GraphicsContext>> context_list;
+    std::vector<std::thread> worker_threads;
+    std::deque<WorkerParams> pending_queue;
+    std::vector<AsyncShaders::Result> finished_work;
+    Core::Frontend::EmuWindow& emu_window;
+};
+
+} // namespace VideoCommon::Shader
-- 
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