OpenSubdiv/opensubdiv/osd/cudaGLVertexBuffer.cpp

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#include "../osd/cudaGLVertexBuffer.h"
#include "../osd/error.h"

#include "../osd/opengl.h"

#include <cuda_runtime.h>
#include <cuda_gl_interop.h>

#include <cassert>

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

OsdCudaGLVertexBuffer::OsdCudaGLVertexBuffer(int numElements, int numVertices)
    : _numElements(numElements), _numVertices(numVertices),
      _vbo(0), _devicePtr(0), _cudaResource(0) {
}

OsdCudaGLVertexBuffer::~OsdCudaGLVertexBuffer() {

    cudaThreadSynchronize();
    unmap();
    cudaGraphicsUnregisterResource(_cudaResource);
    cudaThreadSynchronize();
    glDeleteBuffers(1, &_vbo);
}

OsdCudaGLVertexBuffer *
OsdCudaGLVertexBuffer::Create(int numElements, int numVertices) {
    OsdCudaGLVertexBuffer *instance =
        new OsdCudaGLVertexBuffer(numElements, numVertices);
    if (instance->allocate()) return instance;
    OsdError(OSD_CUDA_GL_ERROR,"OsdCudaGLVertexBuffer::Create failed.\n");
    delete instance;
    return NULL;
}

void
OsdCudaGLVertexBuffer::UpdateData(const float *src, int startVertex, int numVertices) {

    map();
    cudaMemcpy((float*)_devicePtr + _numElements * startVertex,
               src,
               _numElements * numVertices * sizeof(float),
               cudaMemcpyHostToDevice);
}

int
OsdCudaGLVertexBuffer::GetNumElements() const {

    return _numElements;
}

int
OsdCudaGLVertexBuffer::GetNumVertices() const {

    return _numVertices;
}

float *
OsdCudaGLVertexBuffer::BindCudaBuffer() {

    map();
    return static_cast<float*>(_devicePtr);
}

GLuint
OsdCudaGLVertexBuffer::BindVBO() {

    unmap();
    return _vbo;
}

bool
OsdCudaGLVertexBuffer::allocate() {

    int size = _numElements * _numVertices * sizeof(float);
    
    glGenBuffers(1, &_vbo);
    glBindBuffer(GL_ARRAY_BUFFER, _vbo);
    glBufferData(GL_ARRAY_BUFFER, size, 0, GL_STREAM_DRAW);
    glBindBuffer(GL_ARRAY_BUFFER, 0);

    cudaThreadSynchronize();
    // register vbo as cuda resource
    cudaError_t err = cudaGraphicsGLRegisterBuffer(
        &_cudaResource, _vbo, cudaGraphicsMapFlagsNone);

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

void
OsdCudaGLVertexBuffer::map() {

    if (_devicePtr) return;
    size_t num_bytes;
    void *ptr;

    cudaThreadSynchronize();
    cudaError_t err = cudaGraphicsMapResources(1, &_cudaResource, 0);
    if (err != cudaSuccess)
        OsdError(OSD_CUDA_GL_ERROR, "OsdCudaGLVertexBuffer::map failed.\n%s\n", cudaGetErrorString(err));
    err = cudaGraphicsResourceGetMappedPointer(&ptr, &num_bytes, _cudaResource);
    if (err != cudaSuccess)
        OsdError(OSD_CUDA_GL_ERROR, "OsdCudaGLVertexBuffer::map failed.\n%s\n", cudaGetErrorString(err));
    _devicePtr = ptr;
}

void
OsdCudaGLVertexBuffer::unmap() {

    cudaThreadSynchronize();
    if (_devicePtr == NULL) return;
    cudaError_t err = cudaGraphicsUnmapResources(1, &_cudaResource, 0);
    if (err != cudaSuccess)
        OsdError(OSD_CUDA_GL_ERROR, "OsdCudaGLVertexBuffer::unmap failed.\n%s\n", cudaGetErrorString(err));
    _devicePtr = NULL;
}


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