我需要在 2D 中显示大量四边形,使用 Python 和 OpenGL 制作它的最佳方法是什么?目标不是在调用paintGL时将所有数据发送到GPU,因为这需要很多时间......我想必须有可能在GPU上存储顶点数据,如何在Python中制作它?这是我的问题的工作示例:
#!/usr/bin/env python
# -*- coding: utf-8 -*-
from OpenGL.GL import *
from PyQt4 import QtGui, QtCore, QtOpenGL
def get_squares(squareCount, edgeSize):
"""
Returns vertex list for a matrix of squares
squareCount - number of squares on one edge
edgeSize - size of the matrix edge
"""
edgeLength = edgeSize/squareCount/2
vertexList = []
x = edgeLength/2
y = edgeLength/2
z = 0
for i in range(squareCount):
for j in range(squareCount):
vertexList.append([x,y,z])
y += edgeLength
vertexList.append([x,y,z])
x += edgeLength
vertexList.append([x,y,z])
y -= edgeLength
vertexList.append([x,y,z])
x += edgeLength
x = edgeLength/2
y += 2*edgeLength
return vertexList
class OpenGLWidget(QtOpenGL.QGLWidget):
def __init__(self, squareCount = 20, parent = None):
QtOpenGL.QGLWidget.__init__(self, parent)
self.squares = get_squares(squareCount, 50)
def paintGL(self):
glBegin(GL_QUADS)
for point in self.squares:
glVertex3f(*point)
glEnd()
def resizeGL(self, w, h):
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
glOrtho(0, 50, 0, 50, 0, 1)
glViewport(0, 0, w, h)
def initializeGL(self):
glClearColor(0.0, 0.0, 0.0, 1.0)
glClear(GL_COLOR_BUFFER_BIT)
if __name__ == '__main__':
import sys
app = QtGui.QApplication([])
w = OpenGLWidget(squareCount = 20) # try increasing that number and resizing the window...
# for me at squareCount = 200 (40000 squares) it's really slow
w.show()
sys.exit(app.exec_())