OpenSubdiv/opensubdiv/osd/clVertexBuffer.cpp

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#include "../osd/clVertexBuffer.h"

#include <cassert>

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

OsdCLVertexBuffer::OsdCLVertexBuffer(int numElements, int numVertices,
                                     cl_context clContext)
    : _numElements(numElements), _numVertices(numVertices),
      _clQueue(NULL), _clMemory(NULL) {

}

OsdCLVertexBuffer::~OsdCLVertexBuffer() {

    clReleaseMemObject(_clMemory);
}

OsdCLVertexBuffer *
OsdCLVertexBuffer::Create(int numElements, int numVertices,
                          cl_context clContext) {
    OsdCLVertexBuffer *instance =
        new OsdCLVertexBuffer(numElements, numVertices, clContext);
    if (instance->allocate(clContext)) return instance;
    delete instance;
    return NULL;
}

void
OsdCLVertexBuffer::UpdateData(const float *src, int startVertex, int numVertices, cl_command_queue queue) {

    size_t size = _numElements * numVertices * sizeof(float);
    size_t offset = startVertex * _numElements * sizeof(float);

    clEnqueueWriteBuffer(queue, _clMemory, true, offset, size, src, 0, NULL, NULL);
}

int
OsdCLVertexBuffer::GetNumElements() const {

    return _numElements;
}

int
OsdCLVertexBuffer::GetNumVertices() const {

    return _numVertices;
}

cl_mem
OsdCLVertexBuffer::BindCLBuffer(cl_command_queue queue) {

    return _clMemory;
}

bool
OsdCLVertexBuffer::allocate(cl_context clContext) {
    assert(clContext);
    int size = _numVertices * _numElements * sizeof(float);
    cl_int err;

    // XXX: do we really need a dummy buffer?
    float *ptr = new float[_numVertices * _numElements];
    _clMemory = clCreateBuffer(clContext, CL_MEM_READ_WRITE, size, ptr, &err);
    delete[] ptr;

    if (err != CL_SUCCESS) return false;
    return true;
}

}  // end namespace OPENSUBDIV_VERSION
}  // end namespace OpenSubdiv