From 5aeff9aff5c8d9aa21d839560744af883b877b99 Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Sun, 5 Jan 2020 17:32:08 -0300
Subject: vk_renderpass_cache: Initial implementation

The renderpass cache is used to avoid creating renderpasses on each
draw. The hashed structure is not currently optimized.
---
 .../renderer_vulkan/vk_renderpass_cache.cpp        | 100 +++++++++++++++++++++
 1 file changed, 100 insertions(+)
 create mode 100644 src/video_core/renderer_vulkan/vk_renderpass_cache.cpp

(limited to 'src/video_core/renderer_vulkan/vk_renderpass_cache.cpp')

diff --git a/src/video_core/renderer_vulkan/vk_renderpass_cache.cpp b/src/video_core/renderer_vulkan/vk_renderpass_cache.cpp
new file mode 100644
index 000000000..93f5d7ba0
--- /dev/null
+++ b/src/video_core/renderer_vulkan/vk_renderpass_cache.cpp
@@ -0,0 +1,100 @@
+// Copyright 2019 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <memory>
+#include <vector>
+
+#include "video_core/engines/maxwell_3d.h"
+#include "video_core/renderer_vulkan/declarations.h"
+#include "video_core/renderer_vulkan/maxwell_to_vk.h"
+#include "video_core/renderer_vulkan/vk_device.h"
+#include "video_core/renderer_vulkan/vk_renderpass_cache.h"
+
+namespace Vulkan {
+
+VKRenderPassCache::VKRenderPassCache(const VKDevice& device) : device{device} {}
+
+VKRenderPassCache::~VKRenderPassCache() = default;
+
+vk::RenderPass VKRenderPassCache::GetRenderPass(const RenderPassParams& params) {
+    const auto [pair, is_cache_miss] = cache.try_emplace(params);
+    auto& entry = pair->second;
+    if (is_cache_miss) {
+        entry = CreateRenderPass(params);
+    }
+    return *entry;
+}
+
+UniqueRenderPass VKRenderPassCache::CreateRenderPass(const RenderPassParams& params) const {
+    std::vector<vk::AttachmentDescription> descriptors;
+    std::vector<vk::AttachmentReference> color_references;
+
+    for (std::size_t rt = 0; rt < params.color_attachments.size(); ++rt) {
+        const auto attachment = params.color_attachments[rt];
+        const auto format =
+            MaxwellToVK::SurfaceFormat(device, FormatType::Optimal, attachment.pixel_format);
+        ASSERT_MSG(format.attachable, "Trying to attach a non-attachable format with format={}",
+                   static_cast<u32>(attachment.pixel_format));
+
+        // TODO(Rodrigo): Add eMayAlias when it's needed.
+        const auto color_layout = attachment.is_texception
+                                      ? vk::ImageLayout::eGeneral
+                                      : vk::ImageLayout::eColorAttachmentOptimal;
+        descriptors.emplace_back(vk::AttachmentDescriptionFlagBits::eMayAlias, format.format,
+                                 vk::SampleCountFlagBits::e1, vk::AttachmentLoadOp::eLoad,
+                                 vk::AttachmentStoreOp::eStore, vk::AttachmentLoadOp::eDontCare,
+                                 vk::AttachmentStoreOp::eDontCare, color_layout, color_layout);
+        color_references.emplace_back(static_cast<u32>(rt), color_layout);
+    }
+
+    vk::AttachmentReference zeta_attachment_ref;
+    if (params.has_zeta) {
+        const auto format =
+            MaxwellToVK::SurfaceFormat(device, FormatType::Optimal, params.zeta_pixel_format);
+        ASSERT_MSG(format.attachable, "Trying to attach a non-attachable format with format={}",
+                   static_cast<u32>(params.zeta_pixel_format));
+
+        const auto zeta_layout = params.zeta_texception
+                                     ? vk::ImageLayout::eGeneral
+                                     : vk::ImageLayout::eDepthStencilAttachmentOptimal;
+        descriptors.emplace_back(vk::AttachmentDescriptionFlags{}, format.format,
+                                 vk::SampleCountFlagBits::e1, vk::AttachmentLoadOp::eLoad,
+                                 vk::AttachmentStoreOp::eStore, vk::AttachmentLoadOp::eLoad,
+                                 vk::AttachmentStoreOp::eStore, zeta_layout, zeta_layout);
+        zeta_attachment_ref =
+            vk::AttachmentReference(static_cast<u32>(params.color_attachments.size()), zeta_layout);
+    }
+
+    const vk::SubpassDescription subpass_description(
+        {}, vk::PipelineBindPoint::eGraphics, 0, nullptr, static_cast<u32>(color_references.size()),
+        color_references.data(), nullptr, params.has_zeta ? &zeta_attachment_ref : nullptr, 0,
+        nullptr);
+
+    vk::AccessFlags access;
+    vk::PipelineStageFlags stage;
+    if (!color_references.empty()) {
+        access |=
+            vk::AccessFlagBits::eColorAttachmentRead | vk::AccessFlagBits::eColorAttachmentWrite;
+        stage |= vk::PipelineStageFlagBits::eColorAttachmentOutput;
+    }
+
+    if (params.has_zeta) {
+        access |= vk::AccessFlagBits::eDepthStencilAttachmentRead |
+                  vk::AccessFlagBits::eDepthStencilAttachmentWrite;
+        stage |= vk::PipelineStageFlagBits::eLateFragmentTests;
+    }
+
+    const vk::SubpassDependency subpass_dependency(VK_SUBPASS_EXTERNAL, 0, stage, stage, {}, access,
+                                                   {});
+
+    const vk::RenderPassCreateInfo create_info({}, static_cast<u32>(descriptors.size()),
+                                               descriptors.data(), 1, &subpass_description, 1,
+                                               &subpass_dependency);
+
+    const auto dev = device.GetLogical();
+    const auto& dld = device.GetDispatchLoader();
+    return dev.createRenderPassUnique(create_info, nullptr, dld);
+}
+
+} // namespace Vulkan
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