I am new to OpenGL and trying to draw rectangles on the top of a texture.
is this the right way to draw? the output is right, but I am not sure of the efficiency of this method.
GLenum draw_rectangle(std::vector<DrawRectangle> rects , float line_width, DrawColor drawCol = DrawColor(200.0, 0.0, 0.0))
{
for (auto rect : rects) {
glBegin(GL_LINE_LOOP);
glLineWidth(line_width);
glColor3f(drawCol.m_red, drawCol.m_green, drawCol.m_blue);
glVertex3f(rect.m_x, rect.m_y, -1.0f);
glVertex3f(rect.m_x + rect.m_width, rect.m_y, -1.0f);
glVertex3f(rect.m_x + rect.m_width, rect.m_y + rect.m_height, -1.0f);
glVertex3f(rect.m_x, rect.m_y + rect.m_height, -1.0f);
glEnd();
}
return glGetError();
}