bool GLInputVertexAttribute::Enable()
{
if (isCreateOK())
{
bool result = false;
GLSLShader* shader = (dynamic_cast<GLRenderable*>(this->getRenderable()))->getShader();
GLMesh* mesh = (dynamic_cast<GLRenderable*>(this->getRenderable()))->getMesh();
if (shader->isCreateOK() && shader->isEnableOK() && mesh != NULL)
{
m_IAHandle = glGetAttribLocation(shader->getProgramHandle(), m_InputVertexAttributeName.c_str());
LOGD("call glGetAttribLocation(%d, %s), get the input attribute handle is %d", shader->getProgramHandle(), m_InputVertexAttributeName.c_str(), m_IAHandle);
if (m_IAHandle != -1)
{
glEnableVertexAttribArray(m_IAHandle);
if (mesh->isUseCPUBuffer())
{
// use cpu memory's vertex buffer pointer
glVertexAttribPointer(m_IAHandle, m_IAElementNum, m_IAType, m_IANormalized, m_IAStride, (BYTE*)(mesh->getVertexDataPointer()) + m_IAOffset);
}
else
{
// use gpu memory's vertex buffer
glBindBuffer(GL_ARRAY_BUFFER, mesh->getVBOHandle());
glVertexAttribPointer(m_IAHandle, m_IAElementNum, m_IAType, m_IANormalized, m_IAStride, (BYTE*)m_IAOffset);
}
result = true;
}
else
{
LOGE("glGetAttribLocation return -1");
result = false;
}
}
m_bIsEnableOK = result;
}
return isEnableOK();
}
