Mesh::Mesh(Vertex* vertices, GLushort* indices, GLuint numVertices, GLuint numIndices)
: m_numVertices(numVertices), m_numIndices(numIndices), m_vertices(vertices), m_indices(indices)
{
glGenVertexArrays(1, &m_vertexArrayObjID);
glBindVertexArray(m_vertexArrayObjID);
glGenBuffers(1, &m_vertexBufferID);
glBindBuffer(GL_ARRAY_BUFFER, m_vertexBufferID);
glBufferData(GL_ARRAY_BUFFER, vertexBufferSize(), m_vertices, GL_STATIC_DRAW);
glGenBuffers(1, &m_indexBufferID);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_indexBufferID);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, indicesBufferSize(), m_indices, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glEnableVertexAttribArray(1);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(float) * 6, 0);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(float) * 6, (char*)(sizeof(float) * 3));
}
void*
StreamedMesh::internalStreamPtr()
{
if (vertexBufferSize() == 0)
{
LOG ("Error, internal vertex buffer size is 0");
return 0;
}
if (!_vertexBufferCpuMemory)
{
_vertexBufferCpuMemory = (float*)malloc(sizeof(float)*vertexBufferSize());
}
// stash the buffer and put it in an array
std::map <uint32_t, float*> streamMap;
for (auto it = _vertexStreams.begin();
it != _vertexStreams.end();
it++)
{
streamMap.insert (std::make_pair(it->first, it->second->stream()));
}
const std::vector <VertexElement>& declaration = _vertexDeclaration->getDeclaration();
float* vb = (float*)_vertexBufferCpuMemory;
for (uint32_t i = 0; i < vertexCount(); i++)
{
for (uint32_t j = 0; j < declaration.size()-1; j++)
{
VertexElement element = declaration[j];
VertexStream* stream = 0;
if (findStream (stream, element))
{
uint32_t streamId = VertexStream::id(*stream);
auto streamIt = streamMap.find(streamId);
if (streamIt != streamMap.end() &&
streamIt->second)
{
for (uint32_t k = 0; k < stream->stride(); k++)
{
*vb++ = streamIt->second[k];
}
streamIt->second += stream->stride();
}
else
{
uint32_t stride = IVertexDeclaration::elementToSize(element.type());
for (uint32_t k = 0; k < stride; stride++)
{
*vb++ = 0;
}
}
}
else
{
// can't find a stream for this element.
// warn user, and 0 the buffer for the stride size
uint32_t stride = IVertexDeclaration::elementToSize(element.type());
for (uint32_t k = 0; k < stride; stride++)
{
*vb++ = 0;
}
}
}
}
return _vertexBufferCpuMemory;
}
