Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/opensubdiv-source/opensubdiv/osd/cpuGLVertexBuffer.cpp

@@ -0,0 +1,106 @@
+//
+//   Copyright 2013 Pixar
+//
+//   Licensed under the terms set forth in the LICENSE.txt file available at
+//   https://opensubdiv.org/license.
+//
+
+#include "glLoader.h"
+
+#include "../osd/cpuGLVertexBuffer.h"
+
+#include <string.h>
+
+
+namespace OpenSubdiv {
+namespace OPENSUBDIV_VERSION {
+
+namespace Osd {
+
+CpuGLVertexBuffer::CpuGLVertexBuffer(int numElements, int numVertices)
+    : _numElements(numElements), _numVertices(numVertices),
+      _vbo(0), _cpuBuffer(0), _dataDirty(true) {
+
+    // Initialize internal OpenGL loader library if necessary
+    OpenSubdiv::internal::GLLoader::libraryInitializeGL();
+}
+
+CpuGLVertexBuffer::~CpuGLVertexBuffer() {
+
+    delete[] _cpuBuffer;
+
+    if (_vbo) {
+        glDeleteBuffers(1, &_vbo);
+    }
+}
+
+CpuGLVertexBuffer *
+CpuGLVertexBuffer::Create(int numElements, int numVertices, void *) {
+    CpuGLVertexBuffer *instance =
+        new CpuGLVertexBuffer(numElements, numVertices);
+    if (instance->allocate()) return instance;
+    delete instance;
+    return NULL;
+}
+
+void
+CpuGLVertexBuffer::UpdateData(const float *src,
+                              int startVertex, int numVertices,
+                              void * /*deviceContext*/) {
+
+    memcpy(_cpuBuffer + startVertex * GetNumElements(), src,
+           GetNumElements() * numVertices * sizeof(float));
+    _dataDirty = true;
+}
+
+int
+CpuGLVertexBuffer::GetNumElements() const {
+
+    return _numElements;
+}
+
+int
+CpuGLVertexBuffer::GetNumVertices() const {
+
+    return _numVertices;
+}
+
+float*
+CpuGLVertexBuffer::BindCpuBuffer() {
+
+    _dataDirty = true; // caller might modify data
+    return _cpuBuffer;
+}
+
+CpuGLVertexBuffer::ID
+CpuGLVertexBuffer::BindVBO(void * /*deviceContext*/) {
+
+    if (! _dataDirty)
+        return _vbo;
+
+    int size = GetNumElements() * GetNumVertices() * (int) sizeof(float);
+
+    if (! _vbo) {
+        glGenBuffers(1, &_vbo);
+    }
+
+    glBindBuffer(GL_ARRAY_BUFFER, _vbo);
+    glBufferData(GL_ARRAY_BUFFER, size, _cpuBuffer, GL_STATIC_DRAW);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+    _dataDirty = false;
+    return _vbo;
+}
+
+bool
+CpuGLVertexBuffer::allocate() {
+
+    _cpuBuffer = new float[GetNumElements() * GetNumVertices()];
+    _dataDirty = true;
+    return true;
+}
+
+}  // end namespace Osd
+
+}  // end namespace OPENSUBDIV_VERSION
+}  // end namespace OpenSubdiv