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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.
# -----------------------------------------------------------------------------
"""
Show a textured quad
====================
"""
import numpy as np
from vispy import gloo, app
from vispy.gloo import Program
vertex = """
attribute vec2 position;
attribute vec2 texcoord;
varying vec2 v_texcoord;
void main()
{
gl_Position = vec4(position, 0.0, 1.0);
v_texcoord = texcoord;
} """
fragment = """
uniform sampler2D texture;
varying vec2 v_texcoord;
void main()
{
gl_FragColor = texture2D(texture, v_texcoord);
} """
def checkerboard(grid_num=8, grid_size=32):
row_even = grid_num // 2 * [0, 1]
row_odd = grid_num // 2 * [1, 0]
Z = np.row_stack(grid_num // 2 * (row_even, row_odd)).astype(np.uint8)
return 255 * Z.repeat(grid_size, axis=0).repeat(grid_size, axis=1)
class Canvas(app.Canvas):
def __init__(self):
app.Canvas.__init__(self, size=(512, 512), title='Textured quad',
keys='interactive')
# Build program & data
self.program = Program(vertex, fragment, count=4)
self.program['position'] = [(-1, -1), (-1, +1),
(+1, -1), (+1, +1)]
self.program['texcoord'] = [(0, 0), (1, 0), (0, 1), (1, 1)]
self.program['texture'] = checkerboard()
gloo.set_viewport(0, 0, *self.physical_size)
self.show()
def on_draw(self, event):
gloo.set_clear_color('white')
gloo.clear(color=True)
self.program.draw('triangle_strip')
def on_resize(self, event):
gloo.set_viewport(0, 0, *event.physical_size)
if __name__ == '__main__':
c = Canvas()
app.run()
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