1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
|
# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
import ctypes
import math
import numpy
from OpenGL import GL
from PySide6.QtOpenGL import QOpenGLShader, QOpenGLShaderProgram, QOpenGLBuffer
from PySide6.QtGui import (QGuiApplication, QOpenGLFunctions, QVector3D,
QMatrix4x4)
from PySide6.QtCore import (QElapsedTimer, QObject, QMetaObject, QMutex,
QMutexLocker, QThread, QWaitCondition, Signal, Slot)
# Some OpenGL implementations have serious issues with compiling and linking
# shaders on multiple threads concurrently. Avoid self.
init_mutex = QMutex()
VERTEX_SHADER = """attribute highp vec4 vertex;
attribute mediump vec3 normal;
uniform mediump mat4 matrix;
varying mediump vec4 color;
void main(void)
{
vec3 toLight = normalize(vec3(0.0, 0.3, 1.0));
float angle = max(dot(normal, toLight), 0.0);
vec3 col = vec3(0.40, 1.0, 0.0);
color = vec4(col * 0.2 + col * 0.8 * angle, 1.0);
color = clamp(color, 0.0, 1.0);
gl_Position = matrix * vertex;
}
"""
FRAGMENT_SHADER = """varying mediump vec4 color;
void main(void)
{
gl_FragColor = color;
}
"""
class Renderer(QObject, QOpenGLFunctions):
context_wanted = Signal()
def __init__(self, widget):
QObject.__init__(self)
QOpenGLFunctions.__init__(self)
self._glwidget = widget
self._inited = False
self._fAngle = 0
self._fScale = 1
self._vertices = []
self._normals = []
self._program = QOpenGLShaderProgram()
self._vbo = QOpenGLBuffer()
self._vertex_attr = 0
self._normal_attr = 0
self._matrix_uniform = 0
self._renderMutex = QMutex()
self._elapsed = QElapsedTimer()
self._grabMutex = QMutex()
self._grab_condition = QWaitCondition()
self._exiting = False
def lock_renderer(self):
self._renderMutex.lock()
def unlock_renderer(self):
self._renderMutex.unlock()
def grab_mutex(self):
return self._grabMutex
def grab_condition(self):
return self._grab_condition
def prepare_exit(self):
self._exiting = True
self._grab_condition.wakeAll()
def paint_Qt_logo(self):
self._vbo.bind()
self._program.setAttributeBuffer(self._vertex_attr, GL.GL_FLOAT, 0, 3)
size = len(self._vertices) * 3 * ctypes.sizeof(ctypes.c_float)
self._program.setAttributeBuffer(self._normal_attr, GL.GL_FLOAT, size, 3)
self._vbo.release()
self._program.enableAttributeArray(self._vertex_attr)
self._program.enableAttributeArray(self._normal_attr)
self.glDrawArrays(GL.GL_TRIANGLES, 0, len(self._vertices))
self._program.disableAttributeArray(self._normal_attr)
self._program.disableAttributeArray(self._vertex_attr)
@Slot()
def render(self):
global init_mutex
if self._exiting:
return
ctx = self._glwidget.context()
if not ctx: # QOpenGLWidget not yet initialized
return
# Grab the context.
self._grabMutex.lock()
self.context_wanted.emit()
self._grab_condition.wait(self._grabMutex)
with QMutexLocker(self._renderMutex):
self._grabMutex.unlock()
if self._exiting:
return
assert ctx.thread() == QThread.currentThread()
# Make the context (and an offscreen surface) current for self thread.
# The QOpenGLWidget's fbo is bound in the context.
self._glwidget.makeCurrent()
if not self._inited:
self._inited = True
self.initializeOpenGLFunctions()
with QMutexLocker(init_mutex):
self._init_gl()
self._elapsed.start()
self._render_next()
# Make no context current on self thread and move the
# QOpenGLWidget'scontext back to the gui thread.
self._glwidget.doneCurrent()
ctx.moveToThread(QGuiApplication.instance().thread())
# Schedule composition. Note that self will use QueuedConnection,
# meaning that update() will be invoked on the gui thread.
QMetaObject.invokeMethod(self._glwidget, "update")
def _init_gl(self):
vshader = QOpenGLShader(QOpenGLShader.Vertex, self)
vshader.compileSourceCode(VERTEX_SHADER)
fshader = QOpenGLShader(QOpenGLShader.Fragment, self)
fshader.compileSourceCode(FRAGMENT_SHADER)
self._program.addShader(vshader)
self._program.addShader(fshader)
self._program.link()
self._vertex_attr = self._program.attributeLocation("vertex")
self._normal_attr = self._program.attributeLocation("normal")
self._matrix_uniform = self._program.uniformLocation("matrix")
self._fAngle = 0
self._fScale = 1
self.create_geometry()
self._vbo.create()
self._vbo.bind()
data_count = len(self._vertices) * 2 * 3
data = numpy.empty(data_count, dtype=ctypes.c_float)
i = 0
for v in self._vertices:
data[i] = v.x()
i += 1
data[i] = v.y()
i += 1
data[i] = v.z()
i += 1
for n in self._normals:
data[i] = n.x()
i += 1
data[i] = n.y()
i += 1
data[i] = n.z()
i += 1
vertices_size = data_count * ctypes.sizeof(ctypes.c_float)
self._vbo.allocate(data.tobytes(), vertices_size)
def _render_next(self):
self.glClearColor(0.1, 0.2, 0.2, 1.0)
self.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT)
self.glFrontFace(GL.GL_CW)
self.glCullFace(GL.GL_FRONT)
self.glEnable(GL.GL_CULL_FACE)
self.glEnable(GL.GL_DEPTH_TEST)
modelview = QMatrix4x4()
modelview.rotate(self._fAngle, 0.0, 1.0, 0.0)
modelview.rotate(self._fAngle, 1.0, 0.0, 0.0)
modelview.rotate(self._fAngle, 0.0, 0.0, 1.0)
modelview.scale(self._fScale)
modelview.translate(0.0, -0.2, 0.0)
self._program.bind()
self._program.setUniformValue(self._matrix_uniform, modelview)
self.paint_Qt_logo()
self._program.release()
self.glDisable(GL.GL_DEPTH_TEST)
self.glDisable(GL.GL_CULL_FACE)
self._fAngle += 1.0
def create_geometry(self):
self._vertices = []
self._normals = []
x1 = +0.06
y1 = -0.14
x2 = +0.14
y2 = -0.06
x3 = +0.08
y3 = +0.00
x4 = +0.30
y4 = +0.22
self.quad(x1, y1, x2, y2, y2, x2, y1, x1)
self.quad(x3, y3, x4, y4, y4, x4, y3, x3)
self.extrude(x1, y1, x2, y2)
self.extrude(x2, y2, y2, x2)
self.extrude(y2, x2, y1, x1)
self.extrude(y1, x1, x1, y1)
self.extrude(x3, y3, x4, y4)
self.extrude(x4, y4, y4, x4)
self.extrude(y4, x4, y3, x3)
NUM_SECTORS = 100
SECTOR_ANGLE = 2 * math.pi / NUM_SECTORS
for i in range(NUM_SECTORS):
angle = i * SECTOR_ANGLE
sin_angle = math.sin(angle)
cos_angle = math.cos(angle)
x5 = 0.30 * sin_angle
y5 = 0.30 * cos_angle
x6 = 0.20 * sin_angle
y6 = 0.20 * cos_angle
angle += SECTOR_ANGLE
sin_angle = math.sin(angle)
cos_angle = math.cos(angle)
x7 = 0.20 * sin_angle
y7 = 0.20 * cos_angle
x8 = 0.30 * sin_angle
y8 = 0.30 * cos_angle
self.quad(x5, y5, x6, y6, x7, y7, x8, y8)
self.extrude(x6, y6, x7, y7)
self.extrude(x8, y8, x5, y5)
for i in range(len(self._vertices)):
self._vertices[i] *= 2.0
def quad(self, x1, y1, x2, y2, x3, y3, x4, y4):
self._vertices.append(QVector3D(x1, y1, -0.05))
self._vertices.append(QVector3D(x2, y2, -0.05))
self._vertices.append(QVector3D(x4, y4, -0.05))
self._vertices.append(QVector3D(x3, y3, -0.05))
self._vertices.append(QVector3D(x4, y4, -0.05))
self._vertices.append(QVector3D(x2, y2, -0.05))
n = QVector3D.normal(QVector3D(x2 - x1, y2 - y1, 0.0),
QVector3D(x4 - x1, y4 - y1, 0.0))
self._normals.append(n)
self._normals.append(n)
self._normals.append(n)
self._normals.append(n)
self._normals.append(n)
self._normals.append(n)
self._vertices.append(QVector3D(x4, y4, 0.05))
self._vertices.append(QVector3D(x2, y2, 0.05))
self._vertices.append(QVector3D(x1, y1, 0.05))
self._vertices.append(QVector3D(x2, y2, 0.05))
self._vertices.append(QVector3D(x4, y4, 0.05))
self._vertices.append(QVector3D(x3, y3, 0.05))
n = QVector3D.normal(QVector3D(x2 - x4, y2 - y4, 0.0),
QVector3D(x1 - x4, y1 - y4, 0.0))
self._normals.append(n)
self._normals.append(n)
self._normals.append(n)
self._normals.append(n)
self._normals.append(n)
self._normals.append(n)
def extrude(self, x1, y1, x2, y2):
self._vertices.append(QVector3D(x1, y1, +0.05))
self._vertices.append(QVector3D(x2, y2, +0.05))
self._vertices.append(QVector3D(x1, y1, -0.05))
self._vertices.append(QVector3D(x2, y2, -0.05))
self._vertices.append(QVector3D(x1, y1, -0.05))
self._vertices.append(QVector3D(x2, y2, +0.05))
n = QVector3D.normal(QVector3D(x2 - x1, y2 - y1, 0.0),
QVector3D(0.0, 0.0, -0.1))
self._normals.append(n)
self._normals.append(n)
self._normals.append(n)
self._normals.append(n)
self._normals.append(n)
self._normals.append(n)
|
