Ok, so I wrote a quick function than can be called with a texture
region (as returned by atlas.add) as a parameter.
This will automatically tweak the texture coordinates so that nearby
textures in the atlas aren`t sampled while filtering.
Hope somebody else finds this useful.
def tex_border (tex):
""" takes a pyglet texture/region and insets the texture coordinates
by half a texel
allowing for sub-pixel blitting without interpolation with
nearby
regions within
same texture atlas """
coord_width = tex.tex_coords[3] - tex.tex_coords[0]
coord_height = tex.tex_coords[4] - tex.tex_coords[1]
x_adjust = (coord_width / tex.width) / 2.0 # get tex coord half
texel
width
y_adjust = (coord_height / tex.height) / 2.0 # get tex coord half
texel width
# create new 12-tuple texture coordinate
tex.tex_coords = ( tex.tex_coords[0]+x_adjust, tex.tex_coords
[1]+y_adjust, 0,
tex.tex_coords[3]-x_adjust,
tex.tex_coords[4]+y_adjust, 0,
tex.tex_coords[6]-x_adjust,
tex.tex_coords[7]-y_adjust, 0,
tex.tex_coords[9]+x_adjust,
tex.tex_coords[10]-y_adjust, 0)
atlas = pyglet.image.atlas.TextureAtlas (width=1024, height=1024)
pic = pyglet.image.load('bug.png')
bug_tex = atlas.add (small_red_bug_pic)
tex_border (bug_tex)
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