consider this code:
import pyglet
atlas1 = pyglet.image.atlas.TextureAtlas()
atlas2 = pyglet.image.atlas.TextureAtlas()
texture_group1 = pyglet.graphics.TextureGroup(atlas1.texture)
texture_group2 = pyglet.graphics.TextureGroup(atlas2.texture)
group1 = pyglet.graphics.OrderedGroup(0, texture_group1)
group2 = pyglet.graphics.OrderedGroup(1, texture_group2)
group3 = pyglet.graphics.OrderedGroup(2, texture_group1)
tile1 = atlas1.add(pyglet.image.load(None,
file=pyglet.resource.file('test.png')))
tile2 = atlas2.add(pyglet.image.load(None,
file=pyglet.resource.file('test.png')))
tile3 = atlas1.add(pyglet.image.load(None,
file=pyglet.resource.file('test.png')))
batch = pyglet.graphics.Batch()
vertex_list = []
vertex_list.append(batch.add(4, pyglet.gl.GL_QUADS, group1,
('v2i', [0, 0, 32, 0, 32, 32, 0, 32]),
('t3f', tile1.tex_coords),
('c4B', (255,255,255,255)*4)))
vertex_list.append(batch.add(4, pyglet.gl.GL_QUADS, group2,
('v2i', [8, 8, 40, 8, 40, 40, 8, 40]),
('t3f', tile2.tex_coords),
('c4B', (255,255,255,255)*4)))
vertex_list.append(batch.add(4, pyglet.gl.GL_QUADS, group3,
('v2i', [16, 16, 48, 16, 48, 48, 16, 48]),
('t3f', tile3.tex_coords),
('c4B', (255,255,255,255)*4)))
window = pyglet.window.Window(800, 600)
@window.event
def on_draw():
pyglet.gl.glClear(pyglet.gl.GL_COLOR_BUFFER_BIT)
batch.draw()
pyglet.app.run()
I would assume that from the ordering in the OrderedGroup that the
vertex lists are drawn in this order:
tile1, tile2, tile3
but when executing this code it can be seen that they get drawn in
this order:
tile1, tile3, tile2
why? is this a bug?
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