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# -*- coding: utf-8 -*-
# -----------------------------------------------------------------------------
# Copyright (c) 2014, Nicolas P. Rougier. All rights reserved.
# Distributed under the terms of the new BSD License.
# -----------------------------------------------------------------------------
import numpy as np
from numpy.testing import assert_array_equal, assert_allclose
from vispy import gloo
from vispy.gloo import gl
from vispy.app import Canvas
from vispy.testing import (requires_application, run_tests_if_main,
assert_true, assert_equal, assert_raises)
from vispy.gloo import read_pixels
from vispy.gloo.glir import GlirQueue
from vispy.gloo import wrappers
# Dummy queue
dummy_glir = GlirQueue()
dummy_glir.context = dummy_glir
dummy_glir.glir = dummy_glir
def install_dummy_glir():
wrappers.get_current_canvas = lambda x=None: dummy_glir
dummy_glir.clear()
return dummy_glir
def reset_glir():
wrappers.get_current_canvas = gloo.get_current_canvas
def teardown_module():
reset_glir()
def test_wrappers_basic_glir():
"""Test that basic gloo wrapper functions emit right GLIR command"""
glir = install_dummy_glir()
funcs = [('viewport', 0, 0, 10, 10),
('depth_range', 0, 1),
('front_face', 'ccw'),
('cull_face', 'back'),
('line_width', 1),
('polygon_offset', 0, 0),
('clear_color', ),
('clear_depth', ),
('clear_stencil', ),
('blend_func', ),
('blend_color', 'red'),
('blend_equation', 'X'),
('scissor', 0, 0, 10, 10),
('stencil_func', ),
('stencil_mask', ),
('stencil_op', ),
('depth_func', ),
('depth_mask', 'X'),
('color_mask', False, False, False, False),
('sample_coverage', ),
('hint', 'foo', 'bar'),
# not finish and flush, because that would flush the glir queue
]
for func in funcs:
name, args = func[0], func[1:]
f = getattr(gloo, 'set_' + name)
f(*args)
cmds = glir.clear()
assert len(cmds) == len(funcs)
for i, func in enumerate(funcs):
cmd = cmds[i]
nameparts = [a.capitalize() for a in func[0].split('_')]
name = 'gl' + ''.join(nameparts)
assert cmd[0] == 'FUNC'
if cmd[1].endswith('Separate'):
assert cmd[1][:-8] == name
else:
assert cmd[1] == name
reset_glir()
def test_wrappers_glir():
"""Test that special wrapper functions do what they must do"""
glir = install_dummy_glir()
# Test clear() function
gloo.clear()
cmds = glir.clear()
assert len(cmds) == 1
assert cmds[0][0] == 'FUNC'
assert cmds[0][1] == 'glClear'
#
gloo.clear(True, False, False)
cmds = glir.clear()
assert len(cmds) == 1
assert cmds[0][0] == 'FUNC'
assert cmds[0][1] == 'glClear'
assert cmds[0][2] == gl.GL_COLOR_BUFFER_BIT
#
gloo.clear('red')
cmds = glir.clear()
assert len(cmds) == 2
assert cmds[0][0] == 'FUNC'
assert cmds[0][1] == 'glClearColor'
assert cmds[1][0] == 'FUNC'
assert cmds[1][1] == 'glClear'
#
gloo.clear('red', 4, 3)
cmds = glir.clear()
assert len(cmds) == 4
assert cmds[0][1] == 'glClearColor'
assert cmds[1][1] == 'glClearDepth'
assert cmds[2][1] == 'glClearStencil'
assert cmds[3][1] == 'glClear'
# Test set_state() function
gloo.set_state(foo=True, bar=False)
cmds = set(glir.clear())
assert len(cmds) == 2
assert ('FUNC', 'glEnable', 'foo') in cmds
assert ('FUNC', 'glDisable', 'bar') in cmds
#
gloo.set_state(viewport=(0, 0, 10, 10), clear_color='red')
cmds = sorted(glir.clear())
assert len(cmds) == 2
assert cmds[0][1] == 'glClearColor'
assert cmds[1][1] == 'glViewport'
#
presets = gloo.get_state_presets()
a_preset = list(presets.keys())[0]
gloo.set_state(a_preset)
cmds = sorted(glir.clear())
assert len(cmds) == len(presets[a_preset])
reset_glir()
def assert_cmd_raises(E, fun, *args, **kwargs):
gloo.flush() # no error here
fun(*args, **kwargs)
assert_raises(E, gloo.flush)
@requires_application()
def test_wrappers():
"""Test gloo wrappers"""
with Canvas():
gl.use_gl('gl2 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
# this doesn't exist in ES 2.0 namespace
assert_cmd_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(gl.glGetParameter(gl.GL_VIEWPORT), viewport)
assert_equal(gl.glGetParameter(gl.GL_FRONT_FACE), gl.GL_CW)
assert_equal(gl.glGetParameter(gl.GL_BLEND_COLOR), blend_color + (1,))
@requires_application()
def test_read_pixels():
"""Test read_pixels to ensure that the image is not flipped"""
# Create vertices
vPosition = np.array(
[[-1, 1, 0.0], [0, 1, 0.5], # For drawing a square to top left
[-1, 0, 0.0], [0, 0, 0.5]], np.float32)
VERT_SHADER = """ // simple vertex shader
attribute vec3 a_position;
void main (void) {
gl_Position = vec4(a_position, 1.0);
}
"""
FRAG_SHADER = """ // simple fragment shader
void main()
{
gl_FragColor = vec4(1,1,1,1);
}
"""
with Canvas() as c:
c.set_current()
gloo.set_viewport(0, 0, *c.size)
gloo.set_state(depth_test=True)
c._program = gloo.Program(VERT_SHADER, FRAG_SHADER)
c._program['a_position'] = gloo.VertexBuffer(vPosition)
gloo.clear(color='black')
c._program.draw('triangle_strip')
# Check if the return of read_pixels is the same as our drawing
img = read_pixels(alpha=False)
assert_equal(img.shape[:2], c.size[::-1])
top_left = sum(img[0, 0])
assert_true(top_left > 0) # Should be > 0 (255*4)
# Sum of the pixels in top right + bottom left + bottom right corners
corners = sum(img[0, -1] + img[-1, 0] + img[-1, -1])
assert_true(corners == 0) # Should be all 0
gloo.flush()
gloo.finish()
# Check that we can read the depth buffer
img = read_pixels(mode='depth')
assert_equal(img.shape[:2], c.size[::-1])
assert_equal(img.shape[2], 1)
unique_img = np.unique(img)
# we should have quite a few different depth values
assert unique_img.shape[0] > 50
assert unique_img.max() == 255
assert unique_img.min() > 0
run_tests_if_main()
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