如何在PyOpenGL中使用glBufferData()? [英] How to use glBufferData() in PyOpenGL?

问题描述

如何在与OpenGL的PyOpenGL python绑定中使用glBufferData()?

How do you use glBufferData() in the PyOpenGL python bindings to OpenGL?

当我运行以下代码时

import sys
from OpenGL.GL import *
from PySide.QtCore import *
from PySide.QtGui import *
from PySide.QtOpenGL import *

class SimpleTestWidget(QGLWidget):

    def __init__(self):
        QGLWidget.__init__(self)

    def initializeGL(self):
        self._vertexBuffer = glGenBuffers(1)
        glBindBuffer(GL_ARRAY_BUFFER, self._vertexBuffer)
        vertices = [0.5, 0.5, -0.5, 0.5, -0.5, -0.5, 0.5, -0.5]
        glBufferData(GL_ARRAY_BUFFER, vertices, GL_STATIC_DRAW)    # Error

    def paintGL(self):
        glViewport(0, 0, self.width(), self.height())
        glClearColor(0.0, 1.0, 0.0, 1.0)
        glClear(GL_COLOR_BUFFER_BIT)

        glEnableClientState(GL_VERTEX_ARRAY)
        glBindBuffer(GL_ARRAY_BUFFER, self._vertexBuffer)
        glVertexPointer(2, GL_FLOAT, 0, 0)
        glColor3f(1.0, 0.0, 0.0)
        glDrawArrays(GL_QUADS, 0, 4)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    w = SimpleTestWidget()
    w.show()
    app.exec_()

然后调用glBufferData()会导致错误消息

then the call to glBufferData() results in the error message

Haven't implemented type-inference for lists yet

该代码应该在绿色背景上绘制一个红色矩形.

The code is supposed to paint a red rectangle on a green background.

推荐答案

作为一种解决方法，在支持列表之前，将顶点作为numpy数组传递:

As a workaround, until lists are supported, pass the vertices as a numpy array:

vertices = numpy.array([0.5, 0.5, -0.5, 0.5, -0.5, -0.5, 0.5, -0.5], 
                       dtype='float32')

glVertexPointer调用应为glVertexPointer(2, GL_FLOAT, 0, None)

The glVertexPointer call should be glVertexPointer(2, GL_FLOAT, 0, None)

这篇关于如何在PyOpenGL中使用glBufferData()?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！