That may be more of an OpenGL question, and may have to do with rendering
orders in memory. Unfortunately I can't offer much more than that having
not played with depth testing to any great degree. From the tests i've
done, provided I stay within the depth ranges of 1.0 - 0.0, it seems to
render layers and alpha blending fine. Depending on your needs that may be
enough, but otherwise unless someone else happens along with a more clear
answer, you may want to start looking into lower level OpenGL calls.
Here's the current test script (assuming the images already have
transparency applied):
import pyglet
from pyglet.gl import *
class group(pyglet.graphics.OrderedGroup):
def set_state(self):
if self.order == 0:
glBindTexture(GL_TEXTURE_2D, texture.id)
elif self.order == 1:
glBindTexture(GL_TEXTURE_2D, texture2.id)
window = pyglet.window.Window(640,480)
glEnable(GL_DEPTH_TEST)
gl.glEnable(GL_BLEND)
gl.glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
glEnable(GL_ALPHA_TEST)
glAlphaFunc(GL_GREATER, .1)
rendered_sprites = []
batch = pyglet.graphics.Batch()
batch_idle = pyglet.graphics.Batch()
texture = pyglet.image.load('test3.png').get_texture()
texture2 = pyglet.image.load('test4.png').get_texture()
background = pyglet.image.load('background.png').get_texture()
rendered_sprites.append(batch.add(4, GL_QUADS, group(0),
('v3f/static', (0.0,0.0,0.1, 32.0,0.0,0.1,
32.0,32.0,0.1, 0.0,32.0,0.1)),
('t3f/static', texture.tex_coords)))
rendered_sprites.append(batch.add(4, GL_QUADS, group(1),
('v3f/static', (16.0,0.0,0.1, 48.0,0.0,0.1
, 48.0,32.0,0.1, 16.0,32.0,0.1)),
('t3f/static', texture2.tex_coords)))
@window.event
def on_draw():
window.clear()
background.blit(0,0)
glEnable(GL_TEXTURE_2D)
batch.draw()
glDisable(GL_TEXTURE_2D)
@window.event
def on_key_press(symbol,modifiers):
if symbol == pyglet.window.key.SPACE:
if round(rendered_sprites[1].vertices[2],2) == 0.1:
for a in xrange(2,12,3):
rendered_sprites[1].vertices[a] = 1.0
else:
for a in xrange(2,12,3):
rendered_sprites[1].vertices[a] = 0.1
pyglet.app.run()
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