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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
A GLSL sandbox application based on the spinning cube. Requires PySide
or PyQt5.
"""
import numpy as np
from vispy import app, gloo
from vispy.io import read_mesh, load_data_file, load_crate
from vispy.util.transforms import perspective, translate, rotate
try:
from PyQt5.QtGui import QFont
from PyQt5.QtWidgets import (QWidget, QPlainTextEdit, QLabel, QPushButton,
QHBoxLayout, QVBoxLayout)
except ImportError:
from PyQt4.QtGui import (QWidget, QPlainTextEdit, QFont, QLabel,
QPushButton, QHBoxLayout, QVBoxLayout)
VERT_CODE = """
uniform mat4 u_model;
uniform mat4 u_view;
uniform mat4 u_projection;
attribute vec3 a_position;
attribute vec2 a_texcoord;
varying vec2 v_texcoord;
void main()
{
v_texcoord = a_texcoord;
gl_Position = u_projection * u_view * u_model * vec4(a_position,1.0);
//gl_Position = vec4(a_position,1.0);
}
"""
FRAG_CODE = """
uniform sampler2D u_texture;
varying vec2 v_texcoord;
void main()
{
float ty = v_texcoord.y;
float tx = sin(ty*50.0)*0.01 + v_texcoord.x;
gl_FragColor = texture2D(u_texture, vec2(tx, ty));
}
"""
# Read cube data
positions, faces, normals, texcoords = \
read_mesh(load_data_file('orig/cube.obj'))
colors = np.random.uniform(0, 1, positions.shape).astype('float32')
faces_buffer = gloo.IndexBuffer(faces.astype(np.uint16))
class Canvas(app.Canvas):
def __init__(self, **kwargs):
app.Canvas.__init__(self, size=(400, 400), **kwargs)
self.program = gloo.Program(VERT_CODE, FRAG_CODE)
# Set attributes
self.program['a_position'] = gloo.VertexBuffer(positions)
self.program['a_texcoord'] = gloo.VertexBuffer(texcoords)
self.program['u_texture'] = gloo.Texture2D(load_crate())
# Handle transformations
self.init_transforms()
self.apply_zoom()
gloo.set_clear_color((1, 1, 1, 1))
gloo.set_state(depth_test=True)
self._timer = app.Timer('auto', connect=self.update_transforms)
self._timer.start()
self.show()
def on_resize(self, event):
self.apply_zoom()
def on_draw(self, event):
gloo.clear()
self.program.draw('triangles', faces_buffer)
def init_transforms(self):
self.theta = 0
self.phi = 0
self.view = translate((0, 0, -5))
self.model = np.eye(4, dtype=np.float32)
self.projection = np.eye(4, dtype=np.float32)
self.program['u_model'] = self.model
self.program['u_view'] = self.view
def update_transforms(self, event):
self.theta += .5
self.phi += .5
self.model = np.dot(rotate(self.theta, (0, 0, 1)),
rotate(self.phi, (0, 1, 0)))
self.program['u_model'] = self.model
self.update()
def apply_zoom(self):
gloo.set_viewport(0, 0, self.physical_size[0], self.physical_size[1])
self.projection = perspective(45.0, self.size[0] /
float(self.size[1]), 2.0, 10.0)
self.program['u_projection'] = self.projection
class TextField(QPlainTextEdit):
def __init__(self, parent):
QPlainTextEdit.__init__(self, parent)
# Set font to monospaced (TypeWriter)
font = QFont('')
font.setStyleHint(font.TypeWriter, font.PreferDefault)
font.setPointSize(8)
self.setFont(font)
class MainWindow(QWidget):
def __init__(self):
QWidget.__init__(self, None)
self.setMinimumSize(600, 400)
# Create two labels and a button
self.vertLabel = QLabel("Vertex code", self)
self.fragLabel = QLabel("Fragment code", self)
self.theButton = QPushButton("Compile!", self)
self.theButton.clicked.connect(self.on_compile)
# Create two editors
self.vertEdit = TextField(self)
self.vertEdit.setPlainText(VERT_CODE)
self.fragEdit = TextField(self)
self.fragEdit.setPlainText(FRAG_CODE)
# Create a canvas
self.canvas = Canvas(parent=self)
# Layout
hlayout = QHBoxLayout(self)
self.setLayout(hlayout)
vlayout = QVBoxLayout()
#
hlayout.addLayout(vlayout, 1)
hlayout.addWidget(self.canvas.native, 1)
#
vlayout.addWidget(self.vertLabel, 0)
vlayout.addWidget(self.vertEdit, 1)
vlayout.addWidget(self.fragLabel, 0)
vlayout.addWidget(self.fragEdit, 1)
vlayout.addWidget(self.theButton, 0)
self.show()
def on_compile(self):
vert_code = str(self.vertEdit.toPlainText())
frag_code = str(self.fragEdit.toPlainText())
self.canvas.program.set_shaders(vert_code, frag_code)
# Note how we do not need to reset our variables, they are
# re-set automatically (by gloo)
if __name__ == '__main__':
app.create()
m = MainWindow()
app.run()
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