Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/opensubdiv-source/opensubdiv/osd/clGLVertexBuffer.h

@@ -0,0 +1,103 @@
+//
+//   Copyright 2013 Pixar
+//
+//   Licensed under the terms set forth in the LICENSE.txt file available at
+//   https://opensubdiv.org/license.
+//
+
+#ifndef OPENSUBDIV3_OSD_CL_GL_VERTEX_BUFFER_H
+#define OPENSUBDIV3_OSD_CL_GL_VERTEX_BUFFER_H
+
+#include "../version.h"
+
+#include "../osd/opencl.h"
+
+namespace OpenSubdiv {
+namespace OPENSUBDIV_VERSION {
+
+namespace Osd {
+
+///
+/// \brief Concrete vertex buffer class for OpenCL subdivision and OpenGL drawing.
+///
+/// CLGLVertexBuffer implements CLVertexBufferInterface and
+/// GLVertexBufferInterface.
+///
+/// The buffer interop between OpenCL and GL is handled automatically when a
+/// client calls BindCLBuffer and BindVBO methods.
+///
+class CLGLVertexBuffer {
+public:
+    using ID = unsigned int;    // GLuint resource ID
+
+    /// Creator. Returns NULL if error.
+    static CLGLVertexBuffer * Create(int numElements,
+                                     int numVertices,
+                                     cl_context clContext);
+
+    template <typename DEVICE_CONTEXT>
+    static CLGLVertexBuffer * Create(int numElements, int numVertices,
+                                     DEVICE_CONTEXT context) {
+        return Create(numElements, numVertices, context->GetContext());
+    }
+
+    /// Destructor.
+    ~CLGLVertexBuffer();
+
+    /// 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,
+                    cl_command_queue clQueue);
+
+    template<typename DEVICE_CONTEXT>
+    void UpdateData(const float *src, int startVertex, int numVertices,
+                    DEVICE_CONTEXT context) {
+        UpdateData(src, startVertex, numVertices, context->GetCommandQueue());
+    }
+
+    /// 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 the CL memory object. GL buffer will be mapped to CL memory
+    /// space if necessary.
+    cl_mem BindCLBuffer(cl_command_queue queue);
+
+    /// Returns the GL buffer object. If the buffer is mapped to CL memory
+    /// space, it will be unmapped back to GL.
+    ID BindVBO(void *deviceContext = NULL);
+
+protected:
+    /// Constructor.
+    CLGLVertexBuffer(int numElements, int numVertices, cl_context clContext);
+
+    /// Allocates VBO for this buffer and register as a CL resource.
+    /// Returns true if success.
+    bool allocate(cl_context clContext);
+
+    /// Acquires a resource from GL.
+    void map(cl_command_queue queue);
+
+    /// Releases a resource to GL.
+    void unmap();
+
+private:
+    int _numElements;
+    int _numVertices;
+    ID _vbo;
+    cl_command_queue _clQueue;
+    cl_mem _clMemory;
+
+    bool _clMapped;
+};
+
+}  // end namespace Osd
+
+}  // end namespace OPENSUBDIV_VERSION
+using namespace OPENSUBDIV_VERSION;
+
+}  // end namespace OpenSubdiv
+
+#endif  // OPENSUBDIV3_OSD_CL_GL_VERTEX_BUFFER_H