Merge pull request #2318 from ReinUsesLisp/sampler-cache

gl_sampler_cache: Port sampler cache to OpenGL

1 files changed, 60 insertions, 0 deletions

diff --git a/src/video_core/sampler_cache.h b/src/video_core/sampler_cache.h
new file mode 100644
index 000000000..cbe3ad071
--- /dev/null
+++ b/src/video_core/sampler_cache.h
@@ -0,0 +1,60 @@
+// Copyright 2019 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <cstddef>
+#include <unordered_map>
+
+#include "video_core/textures/texture.h"
+
+namespace VideoCommon {
+
+struct SamplerCacheKey final : public Tegra::Texture::TSCEntry {
+    std::size_t Hash() const;
+
+    bool operator==(const SamplerCacheKey& rhs) const;
+
+    bool operator!=(const SamplerCacheKey& rhs) const {
+        return !operator==(rhs);
+    }
+};
+
+} // namespace VideoCommon
+
+namespace std {
+
+template <>
+struct hash<VideoCommon::SamplerCacheKey> {
+    std::size_t operator()(const VideoCommon::SamplerCacheKey& k) const noexcept {
+        return k.Hash();
+    }
+};
+
+} // namespace std
+
+namespace VideoCommon {
+
+template <typename SamplerType, typename SamplerStorageType>
+class SamplerCache {
+public:
+    SamplerType GetSampler(const Tegra::Texture::TSCEntry& tsc) {
+        const auto [entry, is_cache_miss] = cache.try_emplace(SamplerCacheKey{tsc});
+        auto& sampler = entry->second;
+        if (is_cache_miss) {
+            sampler = CreateSampler(tsc);
+        }
+        return ToSamplerType(sampler);
+    }
+
+protected:
+    virtual SamplerStorageType CreateSampler(const Tegra::Texture::TSCEntry& tsc) const = 0;
+
+    virtual SamplerType ToSamplerType(const SamplerStorageType& sampler) const = 0;
+
+private:
+    std::unordered_map<SamplerCacheKey, SamplerStorageType> cache;
+};
+
+} // namespace VideoCommon
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