Add Chromium-only Blender WebEngine parity work

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

@@ -0,0 +1,41 @@
+//
+//   Copyright 2013 Pixar
+//
+//   Licensed under the terms set forth in the LICENSE.txt file available at
+//   https://opensubdiv.org/license.
+//
+
+#ifndef OPENSUBDIV_EXAMPLES_MTL_PTEX_MIPMAP_TEXTURE_H
+#define OPENSUBDIV_EXAMPLES_MTL_PTEX_MIPMAP_TEXTURE_H
+
+#include <opensubdiv/osd/mtlCommon.h>
+#include <opensubdiv/osd/nonCopyable.h>
+#include <Ptexture.h>
+
+
+@protocol MTLBuffer;
+@protocol MTLTexture;
+@class MTLTextureDescriptor;
+
+class MTLPtexMipmapTexture : OpenSubdiv::Osd::NonCopyable<MTLPtexMipmapTexture> {
+public:
+    static MTLPtexMipmapTexture * Create(OpenSubdiv::Osd::MTLContext * deviceContext,
+                                        PtexTexture * reader,
+                                        int maxLevels = 10);
+    
+    
+    static const char* GetShaderSource();
+    
+    id<MTLBuffer> GetLayoutBuffer() const { return _layout; }
+    id<MTLTexture> GetTexelsTexture() const { return _texels; }
+    
+private:
+    MTLPtexMipmapTexture();
+    
+    id<MTLBuffer> _layout;
+    id<MTLTexture> _texels;
+
+    MTLTextureDescriptor* _textureDescriptor;
+};
+
+#endif  // OPENSUBDIV_EXAMPLES_MTL_PTEX_TEXTURE_H