From 322d6a0311624b8304894baa102ab462ea6cf0ea Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Sun, 5 Jan 2020 17:26:04 -0300
Subject: vk_update_descriptor: Initial implementation

The update descriptor is used to store in flat memory a large chunk of
staging data used to update descriptor sets through templates. It
provides a push interface to easily insert descriptors following the
current pipeline. The order used in the descriptor update template has
to be implicitly followed. We can catch bugs here using validation
layers.
---
 .../renderer_vulkan/vk_update_descriptor.h         | 86 ++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 src/video_core/renderer_vulkan/vk_update_descriptor.h

(limited to 'src/video_core/renderer_vulkan/vk_update_descriptor.h')

diff --git a/src/video_core/renderer_vulkan/vk_update_descriptor.h b/src/video_core/renderer_vulkan/vk_update_descriptor.h
new file mode 100644
index 000000000..8c825aa29
--- /dev/null
+++ b/src/video_core/renderer_vulkan/vk_update_descriptor.h
@@ -0,0 +1,86 @@
+// Copyright 2019 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <type_traits>
+#include <variant>
+#include <boost/container/static_vector.hpp>
+
+#include "common/common_types.h"
+#include "video_core/renderer_vulkan/declarations.h"
+
+namespace Vulkan {
+
+class VKDevice;
+class VKScheduler;
+
+class DescriptorUpdateEntry {
+public:
+    explicit DescriptorUpdateEntry() : image{} {}
+
+    DescriptorUpdateEntry(vk::DescriptorImageInfo image) : image{image} {}
+
+    DescriptorUpdateEntry(vk::Buffer buffer, vk::DeviceSize offset, vk::DeviceSize size)
+        : buffer{buffer, offset, size} {}
+
+    DescriptorUpdateEntry(vk::BufferView texel_buffer) : texel_buffer{texel_buffer} {}
+
+private:
+    union {
+        vk::DescriptorImageInfo image;
+        vk::DescriptorBufferInfo buffer;
+        vk::BufferView texel_buffer;
+    };
+};
+
+class VKUpdateDescriptorQueue final {
+public:
+    explicit VKUpdateDescriptorQueue(const VKDevice& device, VKScheduler& scheduler);
+    ~VKUpdateDescriptorQueue();
+
+    void TickFrame();
+
+    void Acquire();
+
+    void Send(vk::DescriptorUpdateTemplate update_template, vk::DescriptorSet set);
+
+    void AddSampledImage(vk::Sampler sampler, vk::ImageView image_view) {
+        entries.emplace_back(vk::DescriptorImageInfo{sampler, image_view, {}});
+    }
+
+    void AddImage(vk::ImageView image_view) {
+        entries.emplace_back(vk::DescriptorImageInfo{{}, image_view, {}});
+    }
+
+    void AddBuffer(const vk::Buffer* buffer, u64 offset, std::size_t size) {
+        entries.push_back(Buffer{buffer, offset, size});
+    }
+
+    void AddTexelBuffer(vk::BufferView texel_buffer) {
+        entries.emplace_back(texel_buffer);
+    }
+
+    vk::ImageLayout* GetLastImageLayout() {
+        return &std::get<vk::DescriptorImageInfo>(entries.back()).imageLayout;
+    }
+
+private:
+    struct Buffer {
+        const vk::Buffer* buffer{};
+        u64 offset{};
+        std::size_t size{};
+    };
+    using Variant = std::variant<vk::DescriptorImageInfo, Buffer, vk::BufferView>;
+    // Old gcc versions don't consider this trivially copyable.
+    // static_assert(std::is_trivially_copyable_v<Variant>);
+
+    const VKDevice& device;
+    VKScheduler& scheduler;
+
+    boost::container::static_vector<Variant, 0x400> entries;
+    boost::container::static_vector<DescriptorUpdateEntry, 0x10000> payload;
+};
+
+} // namespace Vulkan
-- 
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