void LabelMesh::draw(ShaderProgram& _shader) {
checkValidity();
if (!m_isCompiled) { return; }
if (m_nVertices == 0) { return; }
bool bound = false;
// Ensure that geometry is buffered into GPU
if (!m_isUploaded) {
bound = upload();
} else if (m_dirty) {
bound = subDataUpload();
}
if (!bound) {
// Bind buffers for drawing
glBindBuffer(GL_ARRAY_BUFFER, m_glVertexBuffer);
}
loadQuadIndices();
// Enable shader program
_shader.use();
size_t vertexOffset = 0;
for (auto& o : m_vertexOffsets) {
uint32_t nIndices = o.first;
uint32_t nVertices = o.second;
size_t byteOffset = vertexOffset * m_vertexLayout->getStride();
// Enable vertex attribs via vertex layout object
m_vertexLayout->enable(_shader, byteOffset);
glDrawElements(m_drawMode, nIndices, GL_UNSIGNED_SHORT, 0);
vertexOffset += nVertices;
}
}
void LabelMesh::draw(ShaderProgram& _shader) {
bool valid = checkValidity();
if (!m_isCompiled) { return; }
if (m_nVertices == 0) { return; }
// Ensure that geometry is buffered into GPU
if (!m_isUploaded) {
upload();
} else if (m_dirty) {
subDataUpload();
}
if (!valid) {
loadQuadIndices();
}
// Bind buffers for drawing
RenderState::vertexBuffer(m_glVertexBuffer);
RenderState::indexBuffer(s_quadIndexBuffer);
// Enable shader program
_shader.use();
size_t vertexOffset = 0;
for (size_t i = 0; i < m_vertexOffsets.size(); ++i) {
auto& o = m_vertexOffsets[i];
uint32_t nIndices = o.first;
uint32_t nVertices = o.second;
size_t byteOffset = vertexOffset * m_vertexLayout->getStride();
m_vertexLayout->enable(_shader, byteOffset);
glDrawElements(m_drawMode, nIndices, GL_UNSIGNED_SHORT, 0);
vertexOffset += nVertices;
}
}