Add Chromium-only Blender WebEngine parity work

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

@@ -0,0 +1,54 @@
+//
+//   Copyright 2013 Pixar
+//
+//   Licensed under the terms set forth in the LICENSE.txt file available at
+//   https://opensubdiv.org/license.
+//
+
+#ifndef OPENSUBDIV_EXAMPLES_GL_PTEX_MIPMAP_TEXTURE_H
+#define OPENSUBDIV_EXAMPLES_GL_PTEX_MIPMAP_TEXTURE_H
+
+#include "glLoader.h"
+
+#include <opensubdiv/osd/nonCopyable.h>
+
+#include <Ptexture.h>
+#include <stdlib.h>
+
+class GLPtexMipmapTexture : OpenSubdiv::Osd::NonCopyable<GLPtexMipmapTexture> {
+public:
+    static GLPtexMipmapTexture * Create(PtexTexture * reader,
+                                           int maxLevels=-1,
+                                           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.
+    GLuint GetLayoutTextureBuffer() const { return _layout; }
+
+    /// Returns the texels texture array.
+    GLuint GetTexelsTexture() const { return _texels; }
+
+    /// Returns the amount of allocated memory (in bytes)
+    size_t GetMemoryUsage() const { return _memoryUsage; }
+
+    ~GLPtexMipmapTexture();
+
+private:
+    GLPtexMipmapTexture();
+
+    GLsizei _width,   // width / height / depth of the 3D texel buffer
+            _height,
+            _depth;
+
+    GLint   _format;  // texel color format
+
+    GLuint _layout,   // per-face lookup table
+           _texels;   // texel data
+
+    size_t _memoryUsage;  // total amount of memory used (estimate)
+};
+
+#endif  // OPENSUBDIV_EXAMPLES_GL_PTEX_MIPMAP_TEXTURE_H