Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/opensubdiv-source/examples/common/d3d11PtexMipmapTexture.h

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+//
+//   Copyright 2013 Pixar
+//
+//   Licensed under the terms set forth in the LICENSE.txt file available at
+//   https://opensubdiv.org/license.
+//
+
+#ifndef OPENSUBDIV_EXAMPLES_D3D11_PTEX_MIPMAP_TEXTURE_H
+#define OPENSUBDIV_EXAMPLES_D3D11_PTEX_MIPMAP_TEXTURE_H
+
+#include <opensubdiv/osd/nonCopyable.h>
+
+#include <Ptexture.h>
+
+struct ID3D11Buffer;
+struct ID3D11Texture2D;
+struct ID3D11DeviceContext;
+struct ID3D11ShaderResourceView;
+
+class D3D11PtexMipmapTexture : OpenSubdiv::Osd::NonCopyable<D3D11PtexMipmapTexture> {
+public:
+    static D3D11PtexMipmapTexture * Create(ID3D11DeviceContext *deviceContext,
+                                              PtexTexture * reader,
+                                              int maxLevels=10,
+                                              size_t targetMemory=0);
+
+    /// Returns GLSL shader snippet to fetch ptex
+    static const char *GetShaderSource();
+
+    /// Returns the texture buffer containing the layout of the ptex faces
+    /// in the texels texture array.
+    ID3D11Buffer *GetLayoutTextureBuffer() const { return _layout; }
+
+    ID3D11ShaderResourceView **GetLayoutSRV() { return &_layoutSRV; }
+
+    /// Returns the texels texture array.
+    ID3D11Texture2D *GetTexelsTexture() const { return _texels; }
+
+    ID3D11ShaderResourceView **GetTexelsSRV() { return &_texelsSRV; }
+
+    /// Returns the amount of allocated memory (in byte)
+    size_t GetMemoryUsage() const { return _memoryUsage; }
+
+    ~D3D11PtexMipmapTexture();
+
+private:
+    D3D11PtexMipmapTexture();
+
+    int _width,   // width / height / depth of the 3D texel buffer
+        _height,
+        _depth;
+
+    int _format;  // texel color format
+
+    ID3D11Buffer *_layout;     // per-face lookup table
+    ID3D11Texture2D *_texels;  // texel data
+    ID3D11ShaderResourceView *_layoutSRV;
+    ID3D11ShaderResourceView *_texelsSRV;
+
+    size_t _memoryUsage;  // total amount of memory used (estimate)
+};
+
+#endif  // OPENSUBDIV_EXAMPLES_D3D11_PTEX_TEXTURE_H