1 files changed, 221 insertions, 0 deletions
diff --git a/src/video_core/shader/async_shaders.cpp b/src/video_core/shader/async_shaders.cpp
new file mode 100644
index 000000000..aabd62c5c
--- /dev/null
+++ b/src/video_core/shader/async_shaders.cpp
@@ -0,0 +1,221 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <condition_variable>
+#include <mutex>
+#include <thread>
+#include <vector>
+#include "video_core/engines/maxwell_3d.h"
+#include "video_core/renderer_base.h"
+#include "video_core/renderer_opengl/gl_shader_cache.h"
+#include "video_core/shader/async_shaders.h"
+
+namespace VideoCommon::Shader {
+
+AsyncShaders::AsyncShaders(Core::Frontend::EmuWindow& emu_window) : emu_window(emu_window) {}
+
+AsyncShaders::~AsyncShaders() {
+    KillWorkers();
+}
+
+void AsyncShaders::AllocateWorkers() {
+    // Max worker threads we should allow
+    constexpr u32 MAX_THREADS = 4;
+    // Deduce how many threads we can use
+    const u32 threads_used = std::thread::hardware_concurrency() / 4;
+    // Always allow at least 1 thread regardless of our settings
+    const auto max_worker_count = std::max(1U, threads_used);
+    // Don't use more than MAX_THREADS
+    const auto num_workers = std::min(max_worker_count, MAX_THREADS);
+
+    // If we already have workers queued, ignore
+    if (num_workers == worker_threads.size()) {
+        return;
+    }
+
+    // If workers already exist, clear them
+    if (!worker_threads.empty()) {
+        FreeWorkers();
+    }
+
+    // Create workers
+    for (std::size_t i = 0; i < num_workers; i++) {
+        context_list.push_back(emu_window.CreateSharedContext());
+        worker_threads.push_back(
+            std::thread(&AsyncShaders::ShaderCompilerThread, this, context_list[i].get()));
+    }
+}
+
+void AsyncShaders::FreeWorkers() {
+    // Mark all threads to quit
+    is_thread_exiting.store(true);
+    cv.notify_all();
+    for (auto& thread : worker_threads) {
+        thread.join();
+    }
+    // Clear our shared contexts
+    context_list.clear();
+
+    // Clear our worker threads
+    worker_threads.clear();
+}
+
+void AsyncShaders::KillWorkers() {
+    is_thread_exiting.store(true);
+    for (auto& thread : worker_threads) {
+        thread.detach();
+    }
+    // Clear our shared contexts
+    context_list.clear();
+
+    // Clear our worker threads
+    worker_threads.clear();
+}
+
+bool AsyncShaders::HasWorkQueued() const {
+    return !pending_queue.empty();
+}
+
+bool AsyncShaders::HasCompletedWork() const {
+    std::shared_lock lock{completed_mutex};
+    return !finished_work.empty();
+}
+
+bool AsyncShaders::IsShaderAsync(const Tegra::GPU& gpu) const {
+    const auto& regs = gpu.Maxwell3D().regs;
+
+    // If something is using depth, we can assume that games are not rendering anything which will
+    // be used one time.
+    if (regs.zeta_enable) {
+        return true;
+    }
+
+    // If games are using a small index count, we can assume these are full screen quads. Usually
+    // these shaders are only used once for building textures so we can assume they can't be built
+    // async
+    if (regs.index_array.count <= 6 || regs.vertex_buffer.count <= 6) {
+        return false;
+    }
+
+    return true;
+}
+
+std::vector<AsyncShaders::Result> AsyncShaders::GetCompletedWork() {
+    std::vector<Result> results;
+    {
+        std::unique_lock lock{completed_mutex};
+        results.assign(std::make_move_iterator(finished_work.begin()),
+                       std::make_move_iterator(finished_work.end()));
+        finished_work.clear();
+    }
+    return results;
+}
+
+void AsyncShaders::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) {
+    WorkerParams params{
+        .backend = device.UseAssemblyShaders() ? Backend::GLASM : Backend::OpenGL,
+        .device = &device,
+        .shader_type = shader_type,
+        .uid = uid,
+        .code = std::move(code),
+        .code_b = std::move(code_b),
+        .main_offset = main_offset,
+        .compiler_settings = compiler_settings,
+        .registry = registry,
+        .cpu_address = cpu_addr,
+    };
+    std::unique_lock lock(queue_mutex);
+    pending_queue.push(std::move(params));
+    cv.notify_one();
+}
+
+void AsyncShaders::QueueVulkanShader(Vulkan::VKPipelineCache* pp_cache,
+                                     const Vulkan::VKDevice& device, Vulkan::VKScheduler& scheduler,
+                                     Vulkan::VKDescriptorPool& descriptor_pool,
+                                     Vulkan::VKUpdateDescriptorQueue& update_descriptor_queue,
+                                     Vulkan::VKRenderPassCache& renderpass_cache,
+                                     std::vector<VkDescriptorSetLayoutBinding> bindings,
+                                     Vulkan::SPIRVProgram program,
+                                     Vulkan::GraphicsPipelineCacheKey key) {
+    WorkerParams params{
+        .backend = Backend::Vulkan,
+        .pp_cache = pp_cache,
+        .vk_device = &device,
+        .scheduler = &scheduler,
+        .descriptor_pool = &descriptor_pool,
+        .update_descriptor_queue = &update_descriptor_queue,
+        .renderpass_cache = &renderpass_cache,
+        .bindings = bindings,
+        .program = program,
+        .key = key,
+    };
+
+    std::unique_lock lock(queue_mutex);
+    pending_queue.push(std::move(params));
+    cv.notify_one();
+}
+
+void AsyncShaders::ShaderCompilerThread(Core::Frontend::GraphicsContext* context) {
+    while (!is_thread_exiting.load(std::memory_order_relaxed)) {
+        std::unique_lock lock{queue_mutex};
+        cv.wait(lock, [this] { return HasWorkQueued() || is_thread_exiting; });
+        if (is_thread_exiting) {
+            return;
+        }
+
+        // Partial lock to allow all threads to read at the same time
+        if (!HasWorkQueued()) {
+            continue;
+        }
+        // Another thread beat us, just unlock and wait for the next load
+        if (pending_queue.empty()) {
+            continue;
+        }
+
+        // Pull work from queue
+        WorkerParams work = std::move(pending_queue.front());
+        pending_queue.pop();
+        lock.unlock();
+
+        if (work.backend == Backend::OpenGL || work.backend == Backend::GLASM) {
+            const ShaderIR ir(work.code, work.main_offset, work.compiler_settings, *work.registry);
+            const auto scope = context->Acquire();
+            auto program =
+                OpenGL::BuildShader(*work.device, work.shader_type, work.uid, ir, *work.registry);
+            Result result{};
+            result.backend = work.backend;
+            result.cpu_address = work.cpu_address;
+            result.uid = work.uid;
+            result.code = std::move(work.code);
+            result.code_b = std::move(work.code_b);
+            result.shader_type = work.shader_type;
+
+            if (work.backend == Backend::OpenGL) {
+                result.program.opengl = std::move(program->source_program);
+            } else if (work.backend == Backend::GLASM) {
+                result.program.glasm = std::move(program->assembly_program);
+            }
+
+            {
+                std::unique_lock complete_lock(completed_mutex);
+                finished_work.push_back(std::move(result));
+            }
+        } else if (work.backend == Backend::Vulkan) {
+            auto pipeline = std::make_unique<Vulkan::VKGraphicsPipeline>(
+                *work.vk_device, *work.scheduler, *work.descriptor_pool,
+                *work.update_descriptor_queue, *work.renderpass_cache, work.key, work.bindings,
+                work.program);
+
+            work.pp_cache->EmplacePipeline(std::move(pipeline));
+        }
+    }
+}
+
+} // namespace VideoCommon::Shader