video_core: Rewrite the texture cache

The current texture cache has several points that hurt maintainability
and performance. It's easy to break unrelated parts of the cache
when doing minor changes. The cache can easily forget valuable
information about the cached textures by CPU writes or simply by its
normal usage.The current texture cache has several points that hurt
maintainability and performance. It's easy to break unrelated parts
of the cache when doing minor changes. The cache can easily forget
valuable information about the cached textures by CPU writes or simply
by its normal usage.

This commit aims to address those issues.

1 files changed, 51 insertions, 0 deletions

diff --git a/src/video_core/texture_cache/render_targets.h b/src/video_core/texture_cache/render_targets.h
new file mode 100644
index 000000000..9b9544b07
--- /dev/null
+++ b/src/video_core/texture_cache/render_targets.h
@@ -0,0 +1,51 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <algorithm>
+#include <span>
+#include <utility>
+
+#include "common/bit_cast.h"
+#include "video_core/texture_cache/types.h"
+
+namespace VideoCommon {
+
+/// Framebuffer properties used to lookup a framebuffer
+struct RenderTargets {
+    constexpr auto operator<=>(const RenderTargets&) const noexcept = default;
+
+    constexpr bool Contains(std::span<const ImageViewId> elements) const noexcept {
+        const auto contains = [elements](ImageViewId item) {
+            return std::ranges::find(elements, item) != elements.end();
+        };
+        return std::ranges::any_of(color_buffer_ids, contains) || contains(depth_buffer_id);
+    }
+
+    std::array<ImageViewId, NUM_RT> color_buffer_ids;
+    ImageViewId depth_buffer_id;
+    std::array<u8, NUM_RT> draw_buffers{};
+    Extent2D size;
+};
+
+} // namespace VideoCommon
+
+namespace std {
+
+template <>
+struct hash<VideoCommon::RenderTargets> {
+    size_t operator()(const VideoCommon::RenderTargets& rt) const noexcept {
+        using VideoCommon::ImageViewId;
+        size_t value = std::hash<ImageViewId>{}(rt.depth_buffer_id);
+        for (const ImageViewId color_buffer_id : rt.color_buffer_ids) {
+            value ^= std::hash<ImageViewId>{}(color_buffer_id);
+        }
+        value ^= Common::BitCast<u64>(rt.draw_buffers);
+        value ^= Common::BitCast<u64>(rt.size);
+        return value;
+    }
+};
+
+} // namespace std