From f510cc31697334a06ff71cc575d58e8c4f1363e7 Mon Sep 17 00:00:00 2001
From: iwubcode <iwubcode@users.noreply.github.com>
Date: Sun, 21 Jul 2024 17:44:00 -0500
Subject: [PATCH] VideoCommon: add structure for the texture value for
 materials, this value contains details on how to get the sampler (either
 pulled from the asset or using a game texture), as well as details about the
 camera if the texture is a render target

---
 .../Assets/TextureSamplerValue.cpp            | 71 +++++++++++++++++++
 .../VideoCommon/Assets/TextureSamplerValue.h  | 34 +++++++++
 2 files changed, 105 insertions(+)
 create mode 100644 Source/Core/VideoCommon/Assets/TextureSamplerValue.cpp
 create mode 100644 Source/Core/VideoCommon/Assets/TextureSamplerValue.h

diff --git a/Source/Core/VideoCommon/Assets/TextureSamplerValue.cpp b/Source/Core/VideoCommon/Assets/TextureSamplerValue.cpp
new file mode 100644
index 0000000000..61c3468d54
--- /dev/null
+++ b/Source/Core/VideoCommon/Assets/TextureSamplerValue.cpp
@@ -0,0 +1,71 @@
+// Copyright 2024 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "VideoCommon/Assets/TextureSamplerValue.h"
+
+#include <optional>
+
+#include "Common/EnumUtils.h"
+#include "Common/JsonUtil.h"
+#include "Common/StringUtil.h"
+
+namespace VideoCommon
+{
+namespace
+{
+std::optional<TextureSamplerValue::SamplerOrigin>
+ReadSamplerOriginFromJSON(const picojson::object& json)
+{
+  auto sampler_origin = ReadStringFromJson(json, "sampler_origin").value_or("");
+  Common::ToLower(&sampler_origin);
+
+  if (sampler_origin == "asset")
+  {
+    return TextureSamplerValue::SamplerOrigin::Asset;
+  }
+  else if (sampler_origin == "texture_hash")
+  {
+    return TextureSamplerValue::SamplerOrigin::TextureHash;
+  }
+
+  return std::nullopt;
+}
+}  // namespace
+std::string TextureSamplerValue::ToString(SamplerOrigin sampler_origin)
+{
+  if (sampler_origin == SamplerOrigin::Asset)
+    return "asset";
+
+  return "texture_hash";
+}
+
+bool TextureSamplerValue::FromJson(const picojson::object& json, TextureSamplerValue* data)
+{
+  data->asset = ReadStringFromJson(json, "asset").value_or("");
+  data->texture_hash = ReadStringFromJson(json, "texture_hash").value_or("");
+  data->sampler_origin =
+      ReadSamplerOriginFromJSON(json).value_or(TextureSamplerValue::SamplerOrigin::Asset);
+
+  // Render targets
+  data->is_render_target = ReadBoolFromJson(json, "is_render_target").value_or(false);
+  data->camera_originating_draw_call =
+      GraphicsModSystem::DrawCallID{ReadNumericFromJson<u64>(json, "camera_draw_call").value_or(0)};
+
+  return true;
+}
+
+void TextureSamplerValue::ToJson(picojson::object* obj, const TextureSamplerValue& data)
+{
+  if (!obj) [[unlikely]]
+    return;
+
+  obj->emplace("asset", data.asset);
+  obj->emplace("texture_hash", data.texture_hash);
+  obj->emplace("sampler_origin", ToString(data.sampler_origin));
+  obj->emplace("is_render_target", data.is_render_target);
+
+  const auto camera_draw_call = static_cast<double>(
+      Common::ToUnderlying<GraphicsModSystem::DrawCallID>(data.camera_originating_draw_call));
+  obj->emplace("camera_draw_call", camera_draw_call);
+}
+}  // namespace VideoCommon
diff --git a/Source/Core/VideoCommon/Assets/TextureSamplerValue.h b/Source/Core/VideoCommon/Assets/TextureSamplerValue.h
new file mode 100644
index 0000000000..f6c2328c95
--- /dev/null
+++ b/Source/Core/VideoCommon/Assets/TextureSamplerValue.h
@@ -0,0 +1,34 @@
+// Copyright 2024 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <string>
+
+#include <picojson.h>
+
+#include "VideoCommon/Assets/CustomAssetLibrary.h"
+#include "VideoCommon/GraphicsModSystem/Types.h"
+
+namespace VideoCommon
+{
+struct TextureSamplerValue
+{
+  CustomAssetLibrary::AssetID asset;
+
+  enum class SamplerOrigin
+  {
+    Asset,
+    TextureHash
+  };
+  static std::string ToString(SamplerOrigin sampler_origin);
+  SamplerOrigin sampler_origin = SamplerOrigin::Asset;
+  std::string texture_hash;
+
+  bool is_render_target = false;
+  GraphicsModSystem::DrawCallID camera_originating_draw_call;
+
+  static bool FromJson(const picojson::object& json, TextureSamplerValue* data);
+  static void ToJson(picojson::object* obj, const TextureSamplerValue& data);
+};
+}  // namespace VideoCommon