From b170ef9651cda959a5bfa277bb533815f10de5d8 Mon Sep 17 00:00:00 2001
From: TellowKrinkle <tellowkrinkle@gmail.com>
Date: Thu, 10 Nov 2022 19:30:49 -0600
Subject: VideoCommon: Add class for quickly transforming and culling vertices
 on the CPU

---
 Source/Core/VideoCommon/CPUCull.h | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 Source/Core/VideoCommon/CPUCull.h

(limited to 'Source/Core/VideoCommon/CPUCull.h')

diff --git a/Source/Core/VideoCommon/CPUCull.h b/Source/Core/VideoCommon/CPUCull.h
new file mode 100644
index 0000000000..40248035e8
--- /dev/null
+++ b/Source/Core/VideoCommon/CPUCull.h
@@ -0,0 +1,38 @@
+// Copyright 2022 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "VideoCommon/BPMemory.h"
+#include "VideoCommon/DataReader.h"
+#include "VideoCommon/OpcodeDecoding.h"
+
+class CPUCull
+{
+public:
+  ~CPUCull();
+  void Init();
+  bool AreAllVerticesCulled(VertexLoaderBase* loader, OpcodeDecoder::Primitive primitive,
+                            const u8* src, u32 count);
+
+  struct alignas(16) TransformedVertex
+  {
+    float x, y, z, w;
+  };
+
+  using TransformFunction = void (*)(void*, const void*, u32, int);
+  using CullFunction = bool (*)(const CPUCull::TransformedVertex*, int);
+
+private:
+  template <typename T>
+  struct BufferDeleter
+  {
+    void operator()(T* ptr);
+  };
+  std::unique_ptr<TransformedVertex[], BufferDeleter<TransformedVertex>> m_transform_buffer;
+  u32 m_transform_buffer_size = 0;
+  std::array<std::array<TransformFunction, 2>, 2> m_transform_table;
+  Common::EnumMap<Common::EnumMap<CullFunction, CullMode::All>,
+                  OpcodeDecoder::Primitive::GX_DRAW_TRIANGLE_FAN>
+      m_cull_table;
+};
-- 
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