1 files changed, 261 insertions, 0 deletions
diff --git a/src/video_core/post_processing/fx_preset.cpp b/src/video_core/post_processing/fx_preset.cpp
new file mode 100644
index 0000000000..bd66a7d807
--- /dev/null
+++ b/src/video_core/post_processing/fx_preset.cpp
@@ -0,0 +1,261 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include <algorithm>
+
+#include "bundled_fx_presets.h"
+#include "common/fs/file.h"
+#include "common/fs/fs.h"
+#include "common/fs/path_util.h"
+#include "common/settings.h"
+#include "video_core/post_processing/fx_chain.h"
+#include "video_core/post_processing/fx_preset.h"
+
+namespace VideoCore {
+
+namespace {
+
+std::vector<FxPresetDesc> preset_catalog;
+bool preset_catalog_scanned = false;
+
+std::string Trim(std::string_view value) {
+    size_t begin = 0;
+    while (begin < value.size() && (value[begin] == ' ' || value[begin] == '\t')) {
+        ++begin;
+    }
+    size_t end = value.size();
+    while (end > begin) {
+        const char c = value[end - 1];
+        if (c != ' ' && c != '\t' && c != '\r' && c != '\n') {
+            break;
+        }
+        --end;
+    }
+    return std::string(value.substr(begin, end - begin));
+}
+
+FxPresetDesc ParsePreset(std::string_view text) {
+    FxPresetDesc desc;
+
+    size_t start = 0;
+    while (start <= text.size()) {
+        size_t end = text.find('\n', start);
+        if (end == std::string_view::npos) {
+            end = text.size();
+        }
+        const std::string_view line = text.substr(start, end - start);
+        start = end + 1;
+
+        const size_t equals = line.find('=');
+        if (equals == std::string_view::npos) {
+            continue;
+        }
+
+        const std::string key = Trim(line.substr(0, equals));
+        const std::string value = Trim(line.substr(equals + 1));
+
+        if (key == "name") {
+            desc.name = value;
+        } else if (key == "description") {
+            desc.description = value;
+        } else if (key == "chain") {
+            desc.chain = value;
+        }
+    }
+
+    return desc;
+}
+
+std::string PresetFileName(std::string_view name) {
+    std::string out;
+    for (const char c : name) {
+        if (c == ' ') {
+            out += '_';
+            continue;
+        }
+        const bool keep = (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
+                          (c >= '0' && c <= '9') || c == '-' || c == '_';
+        if (keep) {
+            out += c;
+        }
+    }
+    if (out.empty()) {
+        out = "preset";
+    }
+    return out + ".fxp";
+}
+
+std::string ComposePreset(const FxPresetDesc& desc) {
+    std::string out;
+    out += "name=";
+    out += desc.name;
+    out += '\n';
+    out += "description=";
+    out += desc.description;
+    out += '\n';
+    out += "chain=";
+    out += desc.chain;
+    out += '\n';
+    return out;
+}
+
+} // Anonymous namespace
+
+std::filesystem::path GetFxPresetDirectory() {
+    return Common::FS::GetEdenPath(Common::FS::EdenPath::PostPresetDir);
+}
+
+void ReloadFxPresetCatalog() {
+    preset_catalog.clear();
+    preset_catalog_scanned = true;
+
+    const auto root = GetFxPresetDirectory();
+    if (!Common::FS::Exists(root) && !Common::FS::CreateDirs(root)) {
+        return;
+    }
+
+    std::vector<std::string> bundled_names;
+    for (const auto& bundled : BUNDLED_FX_PRESETS) {
+        const auto path = root / bundled.name;
+        bundled_names.emplace_back(bundled.name);
+        if (Common::FS::Exists(path)) {
+            continue;
+        }
+        void(Common::FS::WriteStringToFile(path, Common::FS::FileType::TextFile, bundled.source));
+    }
+
+    std::vector<std::filesystem::path> preset_files;
+    Common::FS::IterateDirEntriesRecursively(
+        root,
+        [&](const std::filesystem::directory_entry& entry) {
+            if (entry.path().extension() == ".fxp") {
+                preset_files.push_back(entry.path());
+            }
+            return true;
+        },
+        Common::FS::DirEntryFilter::File);
+
+    std::sort(preset_files.begin(), preset_files.end());
+
+    for (const auto& file : preset_files) {
+        const std::string text =
+            Common::FS::ReadStringFromFile(file, Common::FS::FileType::TextFile);
+
+        FxPresetDesc desc = ParsePreset(text);
+        if (desc.name.empty() || desc.chain.empty()) {
+            continue;
+        }
+
+        desc.file = Common::FS::PathToUTF8String(file.filename());
+        desc.bundled = std::find(bundled_names.begin(), bundled_names.end(), desc.file) !=
+                       bundled_names.end();
+        preset_catalog.push_back(std::move(desc));
+    }
+}
+
+const std::vector<FxPresetDesc>& GetFxPresetCatalog() {
+    if (!preset_catalog_scanned) {
+        ReloadFxPresetCatalog();
+    }
+    return preset_catalog;
+}
+
+const FxPresetDesc* FindFxPreset(std::string_view name) {
+    const auto& presets = GetFxPresetCatalog();
+    const auto it = std::find_if(presets.begin(), presets.end(),
+                                 [&](const FxPresetDesc& p) { return p.name == name; });
+    if (it == presets.end()) {
+        return nullptr;
+    }
+    return &*it;
+}
+
+bool ApplyFxPreset(std::string_view name) {
+    const FxPresetDesc* preset = FindFxPreset(name);
+    if (preset == nullptr) {
+        return false;
+    }
+
+    FxChain::Instance().SetEntries(ParseFxChain(preset->chain));
+    FxChain::Instance().DropUnknownEntries();
+    FxChain::Instance().StoreToSettings();
+    SetActiveFxPreset(preset->name);
+    return true;
+}
+
+bool SaveFxPreset(std::string_view name, std::string_view description) {
+    if (!IsFxPresetName(name)) {
+        return false;
+    }
+
+    const auto root = GetFxPresetDirectory();
+    if (!Common::FS::Exists(root) && !Common::FS::CreateDirs(root)) {
+        return false;
+    }
+
+    FxPresetDesc desc;
+    desc.name = std::string(name);
+    desc.description = std::string(description);
+    desc.chain = SerializeFxChain(FxChain::Instance().Entries());
+
+    const std::string body = ComposePreset(desc);
+    const std::string file = PresetFileName(name);
+    if (Common::FS::WriteStringToFile(root / file, Common::FS::FileType::TextFile, body) !=
+        body.size()) {
+        return false;
+    }
+
+    ReloadFxPresetCatalog();
+    SetActiveFxPreset(name);
+    return true;
+}
+
+bool DeleteFxPreset(std::string_view name) {
+    const FxPresetDesc* preset = FindFxPreset(name);
+    if (preset == nullptr || preset->bundled) {
+        return false;
+    }
+
+    const auto path = GetFxPresetDirectory() / preset->file;
+    if (!Common::FS::RemoveFile(path)) {
+        return false;
+    }
+
+    if (GetActiveFxPreset() == name) {
+        SetActiveFxPreset(std::string_view());
+    }
+    ReloadFxPresetCatalog();
+    return true;
+}
+
+bool IsFxPresetName(std::string_view name) {
+    if (name.empty()) {
+        return false;
+    }
+    return name.find_first_of("\r\n=") == std::string_view::npos;
+}
+
+std::string GetActiveFxPreset() {
+    return Settings::values.post_shader_preset.GetValue();
+}
+
+void SetActiveFxPreset(std::string_view name) {
+    Settings::values.post_shader_preset.SetValue(std::string(name));
+}
+
+bool IsActiveFxPresetModified() {
+    const std::string active = GetActiveFxPreset();
+    if (active.empty()) {
+        return false;
+    }
+
+    const FxPresetDesc* preset = FindFxPreset(active);
+    if (preset == nullptr) {
+        return true;
+    }
+
+    return SerializeFxChain(FxChain::Instance().Entries()) !=
+           SerializeFxChain(ParseFxChain(preset->chain));
+}
+
+} // namespace VideoCore