void Vao::initialize(RenderState& rs, ShaderProgram& _program, const VertexOffsets& _vertexOffsets,
VertexLayout& _layout, GLuint _vertexBuffer, GLuint _indexBuffer) {
m_glVAOs.resize(_vertexOffsets.size());
GL::genVertexArrays(m_glVAOs.size(), m_glVAOs.data());
fastmap<std::string, GLuint> locations;
// FIXME (use a bindAttrib instead of getLocation) to make those locations shader independent
for (auto& attrib : _layout.getAttribs()) {
GLint location = _program.getAttribLocation(attrib.name);
locations[attrib.name] = location;
}
rs.vertexBuffer(_vertexBuffer);
int vertexOffset = 0;
for (size_t i = 0; i < _vertexOffsets.size(); ++i) {
auto vertexIndexOffset = _vertexOffsets[i];
int nVerts = vertexIndexOffset.second;
GL::bindVertexArray(m_glVAOs[i]);
// ELEMENT_ARRAY_BUFFER must be bound after bindVertexArray to be used by VAO
if (_indexBuffer != 0) {
rs.indexBufferUnset(_indexBuffer);
rs.indexBuffer(_indexBuffer);
}
// Enable vertex layout on the specified locations
_layout.enable(locations, vertexOffset * _layout.getStride());
vertexOffset += nVerts;
}
GL::bindVertexArray(0);
rs.vertexBuffer(0);
rs.indexBuffer(0);
}
void Vao::init(GLuint _vertexBuffer, GLuint _indexBuffer,
VertexLayout& _layout,
const std::unordered_map<std::string, GLuint>&
_locations)
{
generate();
// Bind the vertex array for initialization
bind();
// Bind the vertex and index buffer
if (_vertexBuffer) {
GL_CHECK(glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer));
}
if (_indexBuffer) {
GL_CHECK(glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBuffer));
}
_layout.enable(_locations);
// Make sure VAO is not modified outside
unbind();
}