# Number of GL_FLOAT per vertex of `Simple2dProgram`
	var float_per_vertex: Int is lazy do
		return 4 + 4 + 4 +   # vec4 translation, vec4 color, vec4 coord,
		       1 + 2 + 4*4 + # float scale, vec2 tex_coord, vec4 rotation_row*,
		       1 + 1 +       # float a_fps, float a_n_frames,
		       2 + 2 + 2 +   # vec2 a_coord, vec2 a_tex_coord, vec2 a_tex_diff,
		       1 + 1         # float a_start, float a_loops
	end