使用 PyOpenGL 绘图时出现问题
Trouble plotting with PyOpenGL
我想使用 Qt 和 PyOpenGL 进行一些实时绘图并了解一些 OpenGL，但我什至无法显示我的初始测试数据。
想法是将 x 坐标和 y 坐标存储在不同的缓冲区中，因为 x 坐标很少改变，而 y 坐标几乎每次渲染都会改变。不幸的是，将它们放在不同的缓冲区中给我带来了问题。
现在我没有错误，也没有任何显示，所以我不确定去哪里。
这是我到目前为止的绘图 class:
class GLWidget(QtOpenGL.QGLWidget):
def __init__(self, parent=None):
self.parent = parent
QtOpenGL.QGLWidget.__init__(self, parent)
self.current_position = 0
def initializeGL(self):
self.initGeometry()
self.vertex_code = """
#version 120
attribute vec4 color;
attribute float x_position;
attribute float y_position;
varying vec4 v_color;
void main()
{
gl_Position = vec4(x_position, y_position, 0.0, 1.0);
v_color = color;
} """
self.fragment_code = """
#version 120
varying vec4 v_color;
void main()
{
//gl_FragColor = v_color;
gl_FragColor = vec4(1,1,1,1);
} """
## Build and activate program
# Request program and shader slots from GPU
self.program = GL.glCreateProgram()
self.vertex = GL.glCreateShader(GL.GL_VERTEX_SHADER)
self.fragment = GL.glCreateShader(GL.GL_FRAGMENT_SHADER)
# Set shaders source
GL.glShaderSource(self.vertex, self.vertex_code)
GL.glShaderSource(self.fragment, self.fragment_code)
# Compile shaders
GL.glCompileShader(self.vertex)
GL.glCompileShader(self.fragment)
# Attach shader objects to the program
GL.glAttachShader(self.program, self.vertex)
GL.glAttachShader(self.program, self.fragment)
# Build program
GL.glLinkProgram(self.program)
# Get rid of shaders (not needed anymore)
GL.glDetachShader(self.program, self.vertex)
GL.glDetachShader(self.program, self.fragment)
# Make program the default program
GL.glUseProgram(self.program)
# Create array object
self.vao = GL.glGenVertexArrays(1)
GL.glBindVertexArray(self.vao)
# Request buffer slot from GPU
self.x_data_buffer = GL.glGenBuffers(1)
GL.glBindBuffer(GL.GL_ARRAY_BUFFER, self.x_data_buffer)
GL.glBufferData(GL.GL_ARRAY_BUFFER, ArrayDatatype.arrayByteCount(self.x), self.x, GL.GL_DYNAMIC_DRAW)
self.y_data_buffer = GL.glGenBuffers(1)
GL.glBindBuffer(GL.GL_ARRAY_BUFFER, self.y_data_buffer)
GL.glBufferData(GL.GL_ARRAY_BUFFER, ArrayDatatype.arrayByteCount(self.y), self.y, GL.GL_DYNAMIC_DRAW)
## Bind attributes
#self.stride = self.x.strides[0]
#self.offset = ctypes.c_void_p(0)
self.loc = GL.glGetAttribLocation(self.program, "x_position".encode('utf-8'))
GL.glEnableVertexAttribArray(self.loc)
GL.glBindBuffer(GL.GL_ARRAY_BUFFER, self.x_data_buffer)
GL.glVertexAttribPointer(self.loc, 1, GL.GL_FLOAT, GL.GL_FALSE, 0, 0)
#self.stride = self.y.strides[0]
#self.offset = ctypes.c_void_p(0)
self.loc = GL.glGetAttribLocation(self.program, "y_position".encode('utf-8'))
GL.glEnableVertexAttribArray(self.loc)
GL.glBindBuffer(GL.GL_ARRAY_BUFFER, self.y_data_buffer)
GL.glVertexAttribPointer(self.loc, 1, GL.GL_FLOAT, GL.GL_FALSE, 0, 0)
def resizeGL(self, width, height):
if height == 0: height = 1
GL.glViewport(0, 0, width, height)
GL.glMatrixMode(GL.GL_PROJECTION)
GL.glLoadIdentity()
aspect = width / float(height)
GLU.gluPerspective(45.0, aspect, 1.0, 100.0)
GL.glMatrixMode(GL.GL_MODELVIEW)
def paintGL(self):
GL.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT)
GL.glDrawArrays(GL.GL_LINE_STRIP, 0, self.bins)
def initGeometry(self):
self.bins = 1000
self.x = np.linspace(-0.5,0.5,self.bins)
self.y = np.array([np.sin(val*2*np.pi) for val in self.x])
self.color = np.array([(1,1,1,1) for x in np.arange(self.bins)])
def addPoint(self, point):
#print('ADD POINT')
self.y[self.current_position] = point
if self.current_position < self.bins-1:
self.current_position += 1
else:
self.current_position = 0
return True
def render(self):
#print('RENDER')
self.updateGL()
return True
我还在这里放了一个完整的程序版本：
import sys
from PyQt5.QtWidgets import QDesktopWidget, QMainWindow, QWidget, QAction, qApp, QApplication, QHBoxLayout, QVBoxLayout, QPushButton
from PyQt5.QtCore import QTimer
from PyQt5.QtGui import QIcon
from PyQt5 import QtOpenGL
from OpenGL import GL
from OpenGL import GLU
from OpenGL.arrays.arraydatatype import ArrayDatatype
import ctypes
import numpy as np
from threading import Timer, Thread, Event
class OxySensor(QMainWindow):
def __init__(self):
super().__init__()
self.initUI()
self.initActions()
self.initMenuBar()
self.initRenderTimer()
self.start()
def initUI(self):
self.resize(800,600)
self.center()
self.setWindowTitle('OxySensor')
okButton = QPushButton("OK")
cancelButton = QPushButton("Cancel")
hbox = QHBoxLayout()
hbox.addStretch(1)
hbox.addWidget(okButton)
hbox.addWidget(cancelButton)
vbox = QVBoxLayout()
#vbox.addStretch(1)
self.gl_widget = GLWidget()
vbox.addWidget(self.gl_widget)
vbox.addLayout(hbox)
mainWidget = QWidget(self)
mainWidget.setLayout(vbox)
self.setCentralWidget(mainWidget)
self.show()
def initActions(self):
self.exitAction = QAction(QIcon('images/close20.png'), '&Exit', self)
self.exitAction.setShortcut('Ctrl+W')
self.exitAction.setStatusTip('Exit application')
self.exitAction.triggered.connect(self.onExit)
def initMenuBar(self):
menubar = self.menuBar()
fileMenu = menubar.addMenu('&File')
fileMenu.addAction(self.exitAction)
return True
def initRenderTimer(self):
self.timer = QTimer()
self.timer.timeout.connect(self.gl_widget.render)
self.timer.start(100)
return True
def start(self):
self.stop_flag = Event()
self.thread = SerialPort(self.onTimerExpired, self.stop_flag)
self.thread.start()
self.statusBar().showMessage('Ready')
def center(self):
qr = self.frameGeometry()
cp = QDesktopWidget().availableGeometry().center()
qr.moveCenter(cp)
self.move(qr.topLeft())
return True
def onTimerExpired(self):
data = np.random.uniform(-1,1)
self.gl_widget.addPoint(data)
return True
def onExit(self):
self.close()
return None
def closeEvent(self,event):
self.stop_flag.set()
event.accept()
return None
class GLWidget(QtOpenGL.QGLWidget):
def __init__(self, parent=None):
self.parent = parent
QtOpenGL.QGLWidget.__init__(self, parent)
self.yRotDeg = 0.0
self.current_position = 0
def initializeGL(self):
self.initGeometry()
self.vertex_code = """
#version 120
attribute vec4 color;
attribute float x_position;
attribute float y_position;
varying vec4 v_color;
void main()
{
gl_Position = vec4(x_position, y_position, 0.0, 1.0);
v_color = color;
} """
self.fragment_code = """
#version 120
varying vec4 v_color;
void main()
{
//gl_FragColor = v_color;
gl_FragColor = vec4(1,1,1,1);
} """
## Build and activate program
# Request program and shader slots from GPU
self.program = GL.glCreateProgram()
self.vertex = GL.glCreateShader(GL.GL_VERTEX_SHADER)
self.fragment = GL.glCreateShader(GL.GL_FRAGMENT_SHADER)
# Set shaders source
GL.glShaderSource(self.vertex, self.vertex_code)
GL.glShaderSource(self.fragment, self.fragment_code)
# Compile shaders
GL.glCompileShader(self.vertex)
GL.glCompileShader(self.fragment)
# Attach shader objects to the program
GL.glAttachShader(self.program, self.vertex)
GL.glAttachShader(self.program, self.fragment)
# Build program
GL.glLinkProgram(self.program)
# Get rid of shaders (not needed anymore)
GL.glDetachShader(self.program, self.vertex)
GL.glDetachShader(self.program, self.fragment)
# Make program the default program
GL.glUseProgram(self.program)
# Create array object
self.vao = GL.glGenVertexArrays(1)
GL.glBindVertexArray(self.vao)
# Request buffer slot from GPU
self.x_data_buffer = GL.glGenBuffers(1)
GL.glBindBuffer(GL.GL_ARRAY_BUFFER, self.x_data_buffer)
GL.glBufferData(GL.GL_ARRAY_BUFFER, ArrayDatatype.arrayByteCount(self.x), self.x, GL.GL_DYNAMIC_DRAW)
self.y_data_buffer = GL.glGenBuffers(1)
GL.glBindBuffer(GL.GL_ARRAY_BUFFER, self.y_data_buffer)
GL.glBufferData(GL.GL_ARRAY_BUFFER, ArrayDatatype.arrayByteCount(self.y), self.y, GL.GL_DYNAMIC_DRAW)
## Bind attributes
#self.stride = self.x.strides[0]
#self.offset = ctypes.c_void_p(0)
self.loc = GL.glGetAttribLocation(self.program, "x_position".encode('utf-8'))
GL.glEnableVertexAttribArray(self.loc)
GL.glBindBuffer(GL.GL_ARRAY_BUFFER, self.x_data_buffer)
GL.glVertexAttribPointer(self.loc, 1, GL.GL_FLOAT, GL.GL_FALSE, 0, 0)
#self.stride = self.y.strides[0]
#self.offset = ctypes.c_void_p(0)
self.loc = GL.glGetAttribLocation(self.program, "y_position".encode('utf-8'))
GL.glEnableVertexAttribArray(self.loc)
GL.glBindBuffer(GL.GL_ARRAY_BUFFER, self.y_data_buffer)
GL.glVertexAttribPointer(self.loc, 1, GL.GL_FLOAT, GL.GL_FALSE, 0, 0)
def resizeGL(self, width, height):
if height == 0: height = 1
GL.glViewport(0, 0, width, height)
GL.glMatrixMode(GL.GL_PROJECTION)
GL.glLoadIdentity()
aspect = width / float(height)
GLU.gluPerspective(45.0, aspect, 1.0, 100.0)
GL.glMatrixMode(GL.GL_MODELVIEW)
def paintGL(self):
GL.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT)
GL.glDrawArrays(GL.GL_LINE_STRIP, 0, self.bins)
def initGeometry(self):
self.bins = 1000
self.x = np.linspace(-0.5,0.5,self.bins)
self.y = np.array([np.sin(val*2*np.pi) for val in self.x])
self.color = np.array([(1,1,1,1) for x in np.arange(self.bins)])
def addPoint(self, point):
#print('ADD POINT')
self.y[self.current_position] = point
if self.current_position < self.bins-1:
self.current_position += 1
else:
self.current_position = 0
return True
def render(self):
#print('RENDER')
self.updateGL()
return True
class SerialPort(Thread):
def __init__(self, callback, event):
Thread.__init__(self)
self.callback = callback
self.stopped = event
return None
def SetInterval(self, time_in_seconds):
self.delay_period = time_in_seconds
return True
def run(self):
while not self.stopped.wait(0.1):
self.callback()
return True
if __name__ == '__main__':
app = QApplication(sys.argv)
oxy_sensor = OxySensor()
sys.exit(app.exec_())
问题很可能是 'OpenGL.GL' 函数的调用：
GL.glVertexAttribPointer(self.loc, 1, GL.GL_FLOAT, GL.GL_FALSE, 0, 0)
请注意，最后一个值为 0（不幸的是，它不会转换为 C++ API 中的 (void *)0，而是转换为某个高地址）。您很可能是指 "offset 0" 而不是 "the address of the 0 object"。 IE。使用 None 代替（确实转换为 (void *)0）：
GL.glVertexAttribPointer(self.loc, 1, GL.GL_FLOAT, GL.GL_FALSE, 0, None)
是的，这有点违反直觉。我花了半天时间才弄清楚这就是我自己的代码中输出黑色的原因。
另请注意，如果您使用 Qt 函数（通过 gl = self.context().versionFunctions() 获得）而不是 OpenGL.GL 函数，它们会提供略微不同的API 当你的意思是 "Offset 0".
时，你 实际上传递了 0
你应该看看程序 Avogadro
http://avogadro.cc/wiki/Main_Page
它基于 OpenGL 函数。
源代码是免费的，可能会有用。
我想使用 Qt 和 PyOpenGL 进行一些实时绘图并了解一些 OpenGL，但我什至无法显示我的初始测试数据。
想法是将 x 坐标和 y 坐标存储在不同的缓冲区中，因为 x 坐标很少改变，而 y 坐标几乎每次渲染都会改变。不幸的是，将它们放在不同的缓冲区中给我带来了问题。
现在我没有错误，也没有任何显示，所以我不确定去哪里。
这是我到目前为止的绘图 class:
class GLWidget(QtOpenGL.QGLWidget):
def __init__(self, parent=None):
self.parent = parent
QtOpenGL.QGLWidget.__init__(self, parent)
self.current_position = 0
def initializeGL(self):
self.initGeometry()
self.vertex_code = """
#version 120
attribute vec4 color;
attribute float x_position;
attribute float y_position;
varying vec4 v_color;
void main()
{
gl_Position = vec4(x_position, y_position, 0.0, 1.0);
v_color = color;
} """
self.fragment_code = """
#version 120
varying vec4 v_color;
void main()
{
//gl_FragColor = v_color;
gl_FragColor = vec4(1,1,1,1);
} """
## Build and activate program
# Request program and shader slots from GPU
self.program = GL.glCreateProgram()
self.vertex = GL.glCreateShader(GL.GL_VERTEX_SHADER)
self.fragment = GL.glCreateShader(GL.GL_FRAGMENT_SHADER)
# Set shaders source
GL.glShaderSource(self.vertex, self.vertex_code)
GL.glShaderSource(self.fragment, self.fragment_code)
# Compile shaders
GL.glCompileShader(self.vertex)
GL.glCompileShader(self.fragment)
# Attach shader objects to the program
GL.glAttachShader(self.program, self.vertex)
GL.glAttachShader(self.program, self.fragment)
# Build program
GL.glLinkProgram(self.program)
# Get rid of shaders (not needed anymore)
GL.glDetachShader(self.program, self.vertex)
GL.glDetachShader(self.program, self.fragment)
# Make program the default program
GL.glUseProgram(self.program)
# Create array object
self.vao = GL.glGenVertexArrays(1)
GL.glBindVertexArray(self.vao)
# Request buffer slot from GPU
self.x_data_buffer = GL.glGenBuffers(1)
GL.glBindBuffer(GL.GL_ARRAY_BUFFER, self.x_data_buffer)
GL.glBufferData(GL.GL_ARRAY_BUFFER, ArrayDatatype.arrayByteCount(self.x), self.x, GL.GL_DYNAMIC_DRAW)
self.y_data_buffer = GL.glGenBuffers(1)
GL.glBindBuffer(GL.GL_ARRAY_BUFFER, self.y_data_buffer)
GL.glBufferData(GL.GL_ARRAY_BUFFER, ArrayDatatype.arrayByteCount(self.y), self.y, GL.GL_DYNAMIC_DRAW)
## Bind attributes
#self.stride = self.x.strides[0]
#self.offset = ctypes.c_void_p(0)
self.loc = GL.glGetAttribLocation(self.program, "x_position".encode('utf-8'))
GL.glEnableVertexAttribArray(self.loc)
GL.glBindBuffer(GL.GL_ARRAY_BUFFER, self.x_data_buffer)
GL.glVertexAttribPointer(self.loc, 1, GL.GL_FLOAT, GL.GL_FALSE, 0, 0)
#self.stride = self.y.strides[0]
#self.offset = ctypes.c_void_p(0)
self.loc = GL.glGetAttribLocation(self.program, "y_position".encode('utf-8'))
GL.glEnableVertexAttribArray(self.loc)
GL.glBindBuffer(GL.GL_ARRAY_BUFFER, self.y_data_buffer)
GL.glVertexAttribPointer(self.loc, 1, GL.GL_FLOAT, GL.GL_FALSE, 0, 0)
def resizeGL(self, width, height):
if height == 0: height = 1
GL.glViewport(0, 0, width, height)
GL.glMatrixMode(GL.GL_PROJECTION)
GL.glLoadIdentity()
aspect = width / float(height)
GLU.gluPerspective(45.0, aspect, 1.0, 100.0)
GL.glMatrixMode(GL.GL_MODELVIEW)
def paintGL(self):
GL.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT)
GL.glDrawArrays(GL.GL_LINE_STRIP, 0, self.bins)
def initGeometry(self):
self.bins = 1000
self.x = np.linspace(-0.5,0.5,self.bins)
self.y = np.array([np.sin(val*2*np.pi) for val in self.x])
self.color = np.array([(1,1,1,1) for x in np.arange(self.bins)])
def addPoint(self, point):
#print('ADD POINT')
self.y[self.current_position] = point
if self.current_position < self.bins-1:
self.current_position += 1
else:
self.current_position = 0
return True
def render(self):
#print('RENDER')
self.updateGL()
return True
我还在这里放了一个完整的程序版本：
import sys
from PyQt5.QtWidgets import QDesktopWidget, QMainWindow, QWidget, QAction, qApp, QApplication, QHBoxLayout, QVBoxLayout, QPushButton
from PyQt5.QtCore import QTimer
from PyQt5.QtGui import QIcon
from PyQt5 import QtOpenGL
from OpenGL import GL
from OpenGL import GLU
from OpenGL.arrays.arraydatatype import ArrayDatatype
import ctypes
import numpy as np
from threading import Timer, Thread, Event
class OxySensor(QMainWindow):
def __init__(self):
super().__init__()
self.initUI()
self.initActions()
self.initMenuBar()
self.initRenderTimer()
self.start()
def initUI(self):
self.resize(800,600)
self.center()
self.setWindowTitle('OxySensor')
okButton = QPushButton("OK")
cancelButton = QPushButton("Cancel")
hbox = QHBoxLayout()
hbox.addStretch(1)
hbox.addWidget(okButton)
hbox.addWidget(cancelButton)
vbox = QVBoxLayout()
#vbox.addStretch(1)
self.gl_widget = GLWidget()
vbox.addWidget(self.gl_widget)
vbox.addLayout(hbox)
mainWidget = QWidget(self)
mainWidget.setLayout(vbox)
self.setCentralWidget(mainWidget)
self.show()
def initActions(self):
self.exitAction = QAction(QIcon('images/close20.png'), '&Exit', self)
self.exitAction.setShortcut('Ctrl+W')
self.exitAction.setStatusTip('Exit application')
self.exitAction.triggered.connect(self.onExit)
def initMenuBar(self):
menubar = self.menuBar()
fileMenu = menubar.addMenu('&File')
fileMenu.addAction(self.exitAction)
return True
def initRenderTimer(self):
self.timer = QTimer()
self.timer.timeout.connect(self.gl_widget.render)
self.timer.start(100)
return True
def start(self):
self.stop_flag = Event()
self.thread = SerialPort(self.onTimerExpired, self.stop_flag)
self.thread.start()
self.statusBar().showMessage('Ready')
def center(self):
qr = self.frameGeometry()
cp = QDesktopWidget().availableGeometry().center()
qr.moveCenter(cp)
self.move(qr.topLeft())
return True
def onTimerExpired(self):
data = np.random.uniform(-1,1)
self.gl_widget.addPoint(data)
return True
def onExit(self):
self.close()
return None
def closeEvent(self,event):
self.stop_flag.set()
event.accept()
return None
class GLWidget(QtOpenGL.QGLWidget):
def __init__(self, parent=None):
self.parent = parent
QtOpenGL.QGLWidget.__init__(self, parent)
self.yRotDeg = 0.0
self.current_position = 0
def initializeGL(self):
self.initGeometry()
self.vertex_code = """
#version 120
attribute vec4 color;
attribute float x_position;
attribute float y_position;
varying vec4 v_color;
void main()
{
gl_Position = vec4(x_position, y_position, 0.0, 1.0);
v_color = color;
} """
self.fragment_code = """
#version 120
varying vec4 v_color;
void main()
{
//gl_FragColor = v_color;
gl_FragColor = vec4(1,1,1,1);
} """
## Build and activate program
# Request program and shader slots from GPU
self.program = GL.glCreateProgram()
self.vertex = GL.glCreateShader(GL.GL_VERTEX_SHADER)
self.fragment = GL.glCreateShader(GL.GL_FRAGMENT_SHADER)
# Set shaders source
GL.glShaderSource(self.vertex, self.vertex_code)
GL.glShaderSource(self.fragment, self.fragment_code)
# Compile shaders
GL.glCompileShader(self.vertex)
GL.glCompileShader(self.fragment)
# Attach shader objects to the program
GL.glAttachShader(self.program, self.vertex)
GL.glAttachShader(self.program, self.fragment)
# Build program
GL.glLinkProgram(self.program)
# Get rid of shaders (not needed anymore)
GL.glDetachShader(self.program, self.vertex)
GL.glDetachShader(self.program, self.fragment)
# Make program the default program
GL.glUseProgram(self.program)
# Create array object
self.vao = GL.glGenVertexArrays(1)
GL.glBindVertexArray(self.vao)
# Request buffer slot from GPU
self.x_data_buffer = GL.glGenBuffers(1)
GL.glBindBuffer(GL.GL_ARRAY_BUFFER, self.x_data_buffer)
GL.glBufferData(GL.GL_ARRAY_BUFFER, ArrayDatatype.arrayByteCount(self.x), self.x, GL.GL_DYNAMIC_DRAW)
self.y_data_buffer = GL.glGenBuffers(1)
GL.glBindBuffer(GL.GL_ARRAY_BUFFER, self.y_data_buffer)
GL.glBufferData(GL.GL_ARRAY_BUFFER, ArrayDatatype.arrayByteCount(self.y), self.y, GL.GL_DYNAMIC_DRAW)
## Bind attributes
#self.stride = self.x.strides[0]
#self.offset = ctypes.c_void_p(0)
self.loc = GL.glGetAttribLocation(self.program, "x_position".encode('utf-8'))
GL.glEnableVertexAttribArray(self.loc)
GL.glBindBuffer(GL.GL_ARRAY_BUFFER, self.x_data_buffer)
GL.glVertexAttribPointer(self.loc, 1, GL.GL_FLOAT, GL.GL_FALSE, 0, 0)
#self.stride = self.y.strides[0]
#self.offset = ctypes.c_void_p(0)
self.loc = GL.glGetAttribLocation(self.program, "y_position".encode('utf-8'))
GL.glEnableVertexAttribArray(self.loc)
GL.glBindBuffer(GL.GL_ARRAY_BUFFER, self.y_data_buffer)
GL.glVertexAttribPointer(self.loc, 1, GL.GL_FLOAT, GL.GL_FALSE, 0, 0)
def resizeGL(self, width, height):
if height == 0: height = 1
GL.glViewport(0, 0, width, height)
GL.glMatrixMode(GL.GL_PROJECTION)
GL.glLoadIdentity()
aspect = width / float(height)
GLU.gluPerspective(45.0, aspect, 1.0, 100.0)
GL.glMatrixMode(GL.GL_MODELVIEW)
def paintGL(self):
GL.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT)
GL.glDrawArrays(GL.GL_LINE_STRIP, 0, self.bins)
def initGeometry(self):
self.bins = 1000
self.x = np.linspace(-0.5,0.5,self.bins)
self.y = np.array([np.sin(val*2*np.pi) for val in self.x])
self.color = np.array([(1,1,1,1) for x in np.arange(self.bins)])
def addPoint(self, point):
#print('ADD POINT')
self.y[self.current_position] = point
if self.current_position < self.bins-1:
self.current_position += 1
else:
self.current_position = 0
return True
def render(self):
#print('RENDER')
self.updateGL()
return True
class SerialPort(Thread):
def __init__(self, callback, event):
Thread.__init__(self)
self.callback = callback
self.stopped = event
return None
def SetInterval(self, time_in_seconds):
self.delay_period = time_in_seconds
return True
def run(self):
while not self.stopped.wait(0.1):
self.callback()
return True
if __name__ == '__main__':
app = QApplication(sys.argv)
oxy_sensor = OxySensor()
sys.exit(app.exec_())
问题很可能是 'OpenGL.GL' 函数的调用：
GL.glVertexAttribPointer(self.loc, 1, GL.GL_FLOAT, GL.GL_FALSE, 0, 0)
请注意，最后一个值为 0（不幸的是，它不会转换为 C++ API 中的 (void *)0，而是转换为某个高地址）。您很可能是指 "offset 0" 而不是 "the address of the 0 object"。 IE。使用 None 代替（确实转换为 (void *)0）：
GL.glVertexAttribPointer(self.loc, 1, GL.GL_FLOAT, GL.GL_FALSE, 0, None)
是的，这有点违反直觉。我花了半天时间才弄清楚这就是我自己的代码中输出黑色的原因。
另请注意，如果您使用 Qt 函数（通过 gl = self.context().versionFunctions() 获得）而不是 OpenGL.GL 函数，它们会提供略微不同的API 当你的意思是 "Offset 0".
你应该看看程序 Avogadro
http://avogadro.cc/wiki/Main_Page
它基于 OpenGL 函数。
源代码是免费的，可能会有用。