VideoBackends: Add Metal renderer

Source/Core/VideoBackends/Metal/MTLObjectCache.h

@@ -0,0 +1,91 @@
+// Copyright 2022 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <Metal/Metal.h>
+#include <memory>
+
+#include "VideoBackends/Metal/MRCHelpers.h"
+
+#include "VideoCommon/RenderState.h"
+
+namespace Metal
+{
+extern MRCOwned<id<MTLDevice>> g_device;
+extern MRCOwned<id<MTLCommandQueue>> g_queue;
+
+struct DepthStencilSelector
+{
+  u8 value;
+
+  DepthStencilSelector() : value(0) {}
+  DepthStencilSelector(bool update_enable, enum CompareMode cmp)
+      : value(update_enable | (static_cast<u32>(cmp) << 1))
+  {
+  }
+  DepthStencilSelector(DepthState state)
+      : DepthStencilSelector(state.testenable ? state.updateenable : false,
+                             state.testenable ? state.func : CompareMode::Always)
+  {
+  }
+
+  bool UpdateEnable() const { return value & 1; }
+  enum CompareMode CompareMode() const { return static_cast<enum CompareMode>(value >> 1); }
+
+  bool operator==(const DepthStencilSelector& other) { return value == other.value; }
+  bool operator!=(const DepthStencilSelector& other) { return !(*this == other); }
+  static constexpr size_t N_VALUES = 1 << 4;
+};
+
+struct SamplerSelector
+{
+  u8 value;
+  SamplerSelector() : value(0) {}
+  SamplerSelector(SamplerState state)
+  {
+    value = (static_cast<u32>(state.tm0.min_filter.Value()) << 0) |
+            (static_cast<u32>(state.tm0.mag_filter.Value()) << 1) |
+            (static_cast<u32>(state.tm0.mipmap_filter.Value()) << 2) |
+            (static_cast<u32>(state.tm0.anisotropic_filtering) << 3);
+    value |= (static_cast<u32>(state.tm0.wrap_u.Value()) +
+              3 * static_cast<u32>(state.tm0.wrap_v.Value()))
+             << 4;
+  }
+  FilterMode MinFilter() const { return static_cast<FilterMode>(value & 1); }
+  FilterMode MagFilter() const { return static_cast<FilterMode>((value >> 1) & 1); }
+  FilterMode MipFilter() const { return static_cast<FilterMode>((value >> 2) & 1); }
+  WrapMode WrapU() const { return static_cast<WrapMode>((value >> 4) % 3); }
+  WrapMode WrapV() const { return static_cast<WrapMode>((value >> 4) / 3); }
+  bool AnisotropicFiltering() const { return ((value >> 3) & 1); }
+
+  bool operator==(const SamplerSelector& other) { return value == other.value; }
+  bool operator!=(const SamplerSelector& other) { return !(*this == other); }
+  static constexpr size_t N_VALUES = (1 << 4) * 9;
+};
+
+class ObjectCache
+{
+  ObjectCache();
+
+public:
+  ~ObjectCache();
+
+  static void Initialize(MRCOwned<id<MTLDevice>> device);
+  static void Shutdown();
+
+  id<MTLDepthStencilState> GetDepthStencil(DepthStencilSelector sel) { return m_dss[sel.value]; }
+
+  id<MTLSamplerState> GetSampler(SamplerSelector sel) { return m_samplers[sel.value]; }
+
+  id<MTLSamplerState> GetSampler(SamplerState state) { return GetSampler(SamplerSelector(state)); }
+
+  void ReloadSamplers();
+
+private:
+  MRCOwned<id<MTLDepthStencilState>> m_dss[DepthStencilSelector::N_VALUES];
+  MRCOwned<id<MTLSamplerState>> m_samplers[SamplerSelector::N_VALUES];
+};
+
+extern std::unique_ptr<ObjectCache> g_object_cache;
+}  // namespace Metal