Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/opensubdiv-source/opensubdiv/osd/cudaGLVertexBuffer.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 OPENSUBDIV3_OSD_CUDA_GL_VERTEX_BUFFER_H
+#define OPENSUBDIV3_OSD_CUDA_GL_VERTEX_BUFFER_H
+
+#include "../version.h"
+
+#include <cstddef>
+#include <cuda_runtime.h>
+
+#include <cuda_gl_interop.h>
+
+namespace OpenSubdiv {
+namespace OPENSUBDIV_VERSION {
+
+namespace Osd {
+
+/// \brief Concrete vertex buffer class for cuda subdivision and OpenGL drawing.
+///
+/// CudaGLVertexBuffer implements CudaVertexBufferInterface and
+/// GLVertexBufferInterface.
+///
+/// The buffer interop between Cuda and GL is handled automatically when a
+/// client calls BindCudaBuffer and BindVBO methods.
+///
+class CudaGLVertexBuffer {
+public:
+    using ID = unsigned int;    // GLuint resource ID
+
+    /// Creator. Returns NULL if error.
+    static CudaGLVertexBuffer * Create(int numElements, int numVertices,
+                                       void *deviceContext = NULL);
+
+    /// Destructor.
+    ~CudaGLVertexBuffer();
+
+    /// This method is meant to be used in client code in order to provide
+    /// coarse vertices data to Osd.
+    void UpdateData(const float *src, int startVertex, int numVertices,
+                    void *deviceContext = NULL);
+
+    /// Returns how many elements defined in this vertex buffer.
+    int GetNumElements() const;
+
+    /// Returns how many vertices allocated in this vertex buffer.
+    int GetNumVertices() const;
+
+    /// Returns cuda memory. GL buffer will be mapped to cuda resource
+    /// if necessary.
+    float * BindCudaBuffer();
+
+    /// Returns the GL buffer object. If the buffer is mapped as a cuda
+    /// resource, it will be unmapped back to GL.
+    ID BindVBO(void *deviceContext = NULL);
+
+protected:
+    /// Constructor.
+    CudaGLVertexBuffer(int numElements, int numVertices);
+
+    /// Allocates VBO for this buffer and register as a cuda resource.
+    /// Returns true if success.
+    bool allocate();
+
+    /// Acquire a cuda resource from GL.
+    void map();
+
+    /// Release a cuda resource to GL.
+    void unmap();
+
+private:
+    int _numElements;
+    int _numVertices;
+    ID _vbo;
+    void *_devicePtr;
+    struct cudaGraphicsResource *_cudaResource;
+};
+
+}  // end namespace Osd
+
+}  // end namespace OPENSUBDIV_VERSION
+using namespace OPENSUBDIV_VERSION;
+
+}  // end namespace OpenSubdiv
+
+#endif  // OPENSUBDIV3_OSD_CUDA_GL_VERTEX_BUFFER_H