Video Backends: Split texture cache code out into separate files, introduce 'AbstractTexture'

Source/Core/VideoCommon/AbstractTexture.cpp

@@ -0,0 +1,44 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include <algorithm>
+
+#include "VideoCommon/AbstractTexture.h"
+
+AbstractTexture::AbstractTexture(const TextureConfig& c) : m_config(c)
+{
+}
+
+AbstractTexture::~AbstractTexture() = default;
+
+bool AbstractTexture::Save(const std::string& filename, unsigned int level)
+{
+  return false;
+}
+
+bool AbstractTexture::IsCompressedHostTextureFormat(HostTextureFormat format)
+{
+  // This will need to be changed if we add any other uncompressed formats.
+  return format != HostTextureFormat::RGBA8;
+}
+
+size_t AbstractTexture::CalculateHostTextureLevelPitch(HostTextureFormat format, u32 row_length)
+{
+  switch (format)
+  {
+  case HostTextureFormat::DXT1:
+    return static_cast<size_t>(std::max(1u, row_length / 4)) * 8;
+  case HostTextureFormat::DXT3:
+  case HostTextureFormat::DXT5:
+    return static_cast<size_t>(std::max(1u, row_length / 4)) * 16;
+  case HostTextureFormat::RGBA8:
+  default:
+    return static_cast<size_t>(row_length) * 4;
+  }
+}
+
+const TextureConfig AbstractTexture::GetConfig() const
+{
+  return m_config;
+}