VideoCommon: add function to serialize ShaderAsset to json

Source/Core/Common/CMakeLists.txt

@@ -86,6 +86,7 @@ add_library(common
   IOFile.h
   JitRegister.cpp
   JitRegister.h
+  JsonUtil.h
   Lazy.h
   LinearDiskCache.h
   Logging/ConsoleListener.h

Source/Core/Common/JsonUtil.h

@@ -0,0 +1,26 @@
+// Copyright 2024 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <span>
+
+#include <picojson.h>
+
+// Ideally this would use a concept like, 'template <std::ranges::range Range>' to constrain it,
+// but unfortunately we'd need to require clang 15 for that, since the ranges library isn't
+// fully implemented until then, but this should suffice.
+
+template <typename Range>
+picojson::array ToJsonArray(const Range& data)
+{
+  picojson::array result;
+  result.reserve(std::size(data));
+
+  for (const auto& value : data)
+  {
+    result.emplace_back(static_cast<double>(value));
+  }
+
+  return result;
+}

Source/Core/DolphinLib.props

@@ -125,6 +125,7 @@
     <ClInclude Include="Common\Intrinsics.h" />
     <ClInclude Include="Common\IOFile.h" />
     <ClInclude Include="Common\JitRegister.h" />
+    <ClInclude Include="Common\JsonUtil.h" />
     <ClInclude Include="Common\Lazy.h" />
     <ClInclude Include="Common\LdrWatcher.h" />
     <ClInclude Include="Common\LinearDiskCache.h" />

Source/Core/VideoCommon/Assets/ShaderAsset.cpp

@@ -6,6 +6,7 @@
 #include <algorithm>
 #include <utility>
 
+#include "Common/JsonUtil.h"
 #include "Common/Logging/Log.h"
 #include "Common/StringUtil.h"
 #include "Common/VariantUtil.h"
@@ -291,6 +292,80 @@ bool PixelShaderData::FromJson(const VideoCommon::CustomAssetLibrary::AssetID& a
 
   return true;
 }
+
+void PixelShaderData::ToJson(picojson::object& obj, const PixelShaderData& data)
+{
+  picojson::array json_properties;
+  for (const auto& [name, property] : data.m_properties)
+  {
+    picojson::object json_property;
+    json_property["code_name"] = picojson::value{name};
+    json_property["description"] = picojson::value{property.m_description};
+
+    std::visit(
+        overloaded{[&](const ShaderProperty::Sampler2D& default_value) {
+                     json_property["type"] = picojson::value{"sampler2d"};
+                     json_property["default"] = picojson::value{default_value.value};
+                   },
+                   [&](const ShaderProperty::Sampler2DArray& default_value) {
+                     json_property["type"] = picojson::value{"sampler2darray"};
+                     json_property["default"] = picojson::value{default_value.value};
+                   },
+                   [&](const ShaderProperty::SamplerCube& default_value) {
+                     json_property["type"] = picojson::value{"samplercube"};
+                     json_property["default"] = picojson::value{default_value.value};
+                   },
+                   [&](s32 default_value) {
+                     json_property["type"] = picojson::value{"int"};
+                     json_property["default"] = picojson::value{static_cast<double>(default_value)};
+                   },
+                   [&](const std::array<s32, 2>& default_value) {
+                     json_property["type"] = picojson::value{"int2"};
+                     json_property["default"] = picojson::value{ToJsonArray(default_value)};
+                   },
+                   [&](const std::array<s32, 3>& default_value) {
+                     json_property["type"] = picojson::value{"int3"};
+                     json_property["default"] = picojson::value{ToJsonArray(default_value)};
+                   },
+                   [&](const std::array<s32, 4>& default_value) {
+                     json_property["type"] = picojson::value{"int4"};
+                     json_property["default"] = picojson::value{ToJsonArray(default_value)};
+                   },
+                   [&](float default_value) {
+                     json_property["type"] = picojson::value{"float"};
+                     json_property["default"] = picojson::value{static_cast<double>(default_value)};
+                   },
+                   [&](const std::array<float, 2>& default_value) {
+                     json_property["type"] = picojson::value{"float2"};
+                     json_property["default"] = picojson::value{ToJsonArray(default_value)};
+                   },
+                   [&](const std::array<float, 3>& default_value) {
+                     json_property["type"] = picojson::value{"float3"};
+                     json_property["default"] = picojson::value{ToJsonArray(default_value)};
+                   },
+                   [&](const std::array<float, 4>& default_value) {
+                     json_property["type"] = picojson::value{"float4"};
+                     json_property["default"] = picojson::value{ToJsonArray(default_value)};
+                   },
+                   [&](const ShaderProperty::RGB& default_value) {
+                     json_property["type"] = picojson::value{"rgb"};
+                     json_property["default"] = picojson::value{ToJsonArray(default_value.value)};
+                   },
+                   [&](const ShaderProperty::RGBA& default_value) {
+                     json_property["type"] = picojson::value{"rgba"};
+                     json_property["default"] = picojson::value{ToJsonArray(default_value.value)};
+                   },
+                   [&](bool default_value) {
+                     json_property["type"] = picojson::value{"bool"};
+                     json_property["default"] = picojson::value{default_value};
+                   }},
+        property.m_default);
+
+    json_properties.push_back(picojson::value{json_property});
+  }
+  obj["properties"] = picojson::value{json_properties};
+}
+
 CustomAssetLibrary::LoadInfo PixelShaderAsset::LoadImpl(const CustomAssetLibrary::AssetID& asset_id)
 {
   auto potential_data = std::make_shared<PixelShaderData>();

Source/Core/VideoCommon/Assets/ShaderAsset.h

@@ -52,6 +52,7 @@ struct PixelShaderData
 {
   static bool FromJson(const CustomAssetLibrary::AssetID& asset_id, const picojson::object& json,
                        PixelShaderData* data);
+  static void ToJson(picojson::object& obj, const PixelShaderData& data);
 
   // These shader properties describe the input that the
   // shader expects to expose.  The key is text