def test_wrappers():
"""Test gloo wrappers"""
with Canvas():
gl.use_gl('desktop debug')
gloo.clear('#112233') # make it so that there's something non-zero
# check presets
assert_raises(ValueError, gloo.set_state, preset='foo')
for state in gloo.get_state_presets().keys():
gloo.set_state(state)
assert_raises(ValueError, gloo.set_blend_color, (0., 0.)) # bad color
assert_raises(TypeError, gloo.set_hint, 1, 2) # need strs
assert_raises(TypeError, gloo.get_parameter, 1) # need str
# this doesn't exist in ES 2.0 namespace
assert_raises(ValueError, gloo.set_hint, 'fog_hint', 'nicest')
# test bad enum
assert_raises(RuntimeError, gloo.set_line_width, -1)
# check read_pixels
x = gloo.read_pixels()
assert_true(isinstance(x, np.ndarray))
assert_true(isinstance(gloo.read_pixels((0, 0, 1, 1)), np.ndarray))
assert_raises(ValueError, gloo.read_pixels, (0, 0, 1)) # bad port
y = gloo.read_pixels(alpha=False, out_type=np.ubyte)
assert_equal(y.shape, x.shape[:2] + (3, ))
assert_array_equal(x[..., :3], y)
y = gloo.read_pixels(out_type='float')
assert_allclose(x / 255., y)
# now let's (indirectly) check our set_* functions
viewport = (0, 0, 1, 1)
blend_color = (0., 0., 0.)
_funs = dict(
viewport=viewport, # checked
hint=('generate_mipmap_hint', 'nicest'),
depth_range=(1., 2.),
front_face='cw', # checked
cull_face='front',
line_width=1.,
polygon_offset=(1., 1.),
blend_func=('zero', 'one'),
blend_color=blend_color,
blend_equation='func_add',
scissor=(0, 0, 1, 1),
stencil_func=('never', 1, 2, 'back'),
stencil_mask=4,
stencil_op=('zero', 'zero', 'zero', 'back'),
depth_func='greater',
depth_mask=True,
color_mask=(True, True, True, True),
sample_coverage=(0.5, True))
gloo.set_state(**_funs)
gloo.clear((1., 1., 1., 1.), 0.5, 1)
gloo.flush()
gloo.finish()
# check some results
assert_array_equal(gloo.get_parameter('viewport'), viewport)
assert_equal(gloo.get_parameter('front_face'), gl.GL_CW)
assert_equal(gloo.get_parameter('blend_color'), blend_color + (1, ))
def test_wrappers():
"""Test gloo wrappers"""
with Canvas():
gl.use_gl('desktop debug')
gloo.clear('#112233') # make it so that there's something non-zero
# check presets
assert_raises(ValueError, gloo.set_state, preset='foo')
for state in gloo.get_state_presets().keys():
gloo.set_state(state)
assert_raises(ValueError, gloo.set_blend_color, (0., 0.)) # bad color
assert_raises(TypeError, gloo.set_hint, 1, 2) # need strs
assert_raises(TypeError, gloo.get_parameter, 1) # need str
# this doesn't exist in ES 2.0 namespace
assert_raises(ValueError, gloo.set_hint, 'fog_hint', 'nicest')
# test bad enum
assert_raises(RuntimeError, gloo.set_line_width, -1)
# check read_pixels
x = gloo.read_pixels()
assert_true(isinstance(x, np.ndarray))
assert_true(isinstance(gloo.read_pixels((0, 0, 1, 1)), np.ndarray))
assert_raises(ValueError, gloo.read_pixels, (0, 0, 1)) # bad port
y = gloo.read_pixels(alpha=False, out_type=np.ubyte)
assert_equal(y.shape, x.shape[:2] + (3,))
assert_array_equal(x[..., :3], y)
y = gloo.read_pixels(out_type='float')
assert_allclose(x/255., y)
# now let's (indirectly) check our set_* functions
viewport = (0, 0, 1, 1)
blend_color = (0., 0., 0.)
_funs = dict(viewport=viewport, # checked
hint=('generate_mipmap_hint', 'nicest'),
depth_range=(1., 2.),
front_face='cw', # checked
cull_face='front',
line_width=1.,
polygon_offset=(1., 1.),
blend_func=('zero', 'one'),
blend_color=blend_color,
blend_equation='func_add',
scissor=(0, 0, 1, 1),
stencil_func=('never', 1, 2, 'back'),
stencil_mask=4,
stencil_op=('zero', 'zero', 'zero', 'back'),
depth_func='greater',
depth_mask=True,
color_mask=(True, True, True, True),
sample_coverage=(0.5, True))
gloo.set_state(**_funs)
gloo.clear((1., 1., 1., 1.), 0.5, 1)
gloo.flush()
gloo.finish()
# check some results
assert_array_equal(gloo.get_parameter('viewport'), viewport)
assert_equal(gloo.get_parameter('front_face'), gl.GL_CW)
assert_equal(gloo.get_parameter('blend_color'), blend_color + (1,))
def on_mouse_move(self, event):
x, y = event.pos
h = gloo.get_parameter('viewport')[3]
self.data['a_position'][self.index] = x, h - y
self.data['a_size'][self.index] = 5
self.data['a_fg_color'][self.index] = 0, 0, 0, 1
self.index = (self.index + 1) % 500
def on_mouse_move(self, event):
x, y = event.pos
h = gloo.get_parameter('viewport')[3]
self.data['a_position'][self.index] = x, h - y
self.data['a_size'][self.index] = 5
self.data['a_fg_color'][self.index] = 0, 0, 0, 1
self.index = (self.index + 1) % 500
def on_passive_motion(x, y):
global index
_, _, _, h = gloo.get_parameter('viewport')
data['a_position'][index] = x, h - y
data['a_size'][index] = 5
data['a_fg_color'][index] = 0, 0, 0, 1
index = (index + 1) % 500
glut.glutPostRedisplay()
def draw(self):
viewport = gloo.get_parameter('viewport')
size = viewport[2:4]
x_view_offset = (size[0] - self.size[0]) // 2
y_view_offset = (size[1] - self.size[1]) // 2
x = self.x + x_view_offset
y = self.y + 15 + y_view_offset
gloo.set_viewport(x, y, self.size[0], self.size[1])
self.text.pos = (0, 0)
self.text.draw()
def draw(self):
viewport = gloo.get_parameter('viewport')
size = viewport[2:4]
x_view_offset = (size[0] - self.size[0]) // 2
y_view_offset = (size[1] - self.size[1]) // 2
x = self.x + x_view_offset
y = self.y + 15 + y_view_offset
gloo.set_viewport(x, y, self.size[0], self.size[1])
self.text.pos = (0, 0)
self.text.draw()
def _text_to_vbo(text, font, anchor_x, anchor_y, lowres_size):
"""Convert text characters to vertex buffer object."""
# XXX: This function may benefit from a LRU cache.
text_vtype = np.dtype([('a_position', 'f4', 2),
('a_texcoord', 'f4', 2)])
vertices = np.zeros(len(text) * 4, dtype=text_vtype)
prev = None
width = height = ascender = descender = 0
ratio, slop = 1. / font.ratio, font.slop
x_off = -slop
# Need to make sure we have a unicode string here (Py2.7 mis-interprets
# characters like "•" otherwise)
if sys.version[0] == '2' and isinstance(text, str):
text = text.decode('utf-8')
# Need to store the original viewport, because the font[char] will
# trigger SDF rendering, which changes our viewport
orig_viewport = get_parameter('viewport')
positions = []
texcoords = []
# XXX: Iterating over characters in Python is a really bad idea.
for char in text:
glyph = font[char]
kerning = glyph['kerning'].get(prev, 0.) * ratio
x0 = x_off + glyph['offset'][0] * ratio + kerning
y0 = glyph['offset'][1] * ratio + slop
x1 = x0 + glyph['size'][0]
y1 = y0 - glyph['size'][1]
u0, v0, u1, v1 = glyph['texcoords']
positions.extend(rect_extents_to_corners(x0, y0, x1, y1))
texcoords.extend(rect_extents_to_corners(u0, v0, u1, v1))
x_move = glyph['advance'] * ratio + kerning
x_off += x_move
width += x_move
ascender = max(ascender, y0 - slop)
descender = min(descender, y1 + slop)
height = max(height, glyph['size'][1] - 2*slop)
prev = char
vertices['a_position'] = positions
vertices['a_texcoord'] = texcoords
# Also analyse chars with large ascender and descender, otherwise the
# vertical alignment can be very inconsistent
for char in 'hy':
glyph = font[char]
y0 = glyph['offset'][1] * ratio + slop
y1 = y0 - glyph['size'][1]
ascender = max(ascender, y0 - slop)
descender = min(descender, y1 + slop)
height = max(height, glyph['size'][1] - 2*slop)
set_viewport(*orig_viewport)
# Tight bounding box (loose would be width, font.height /.asc / .desc)
width -= glyph['advance'] * ratio - (glyph['size'][0] - 2*slop)
dx = dy = 0
if anchor_y == 'top':
dy = -ascender
elif anchor_y in ('center', 'middle'):
dy = -(height / 2 + descender)
elif anchor_y == 'bottom':
dy = -descender
if anchor_x == 'right':
dx = -width
elif anchor_x == 'center':
dx = -width / 2.
vertices['a_position'] += (dx, dy)
vertices['a_position'] /= lowres_size
# XXX: Subtract descender to include that in the height
text_extent = (0, descender, width, height - descender)
return VertexBuffer(vertices), text_extent
