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import sys
import pygame
from pygame.locals import *
from OpenGL.GLUT import *
from math import *
from Numeric import *
from pyglew import *
pygame.display.init()
surface = pygame.display.set_mode((512,512), OPENGL|DOUBLEBUF)
glewInit()
print "Vendor =", glGetString(GL_VENDOR)
print "Renderer =", glGetString(GL_RENDERER)
print "Version =", glGetString(GL_VERSION)
if not GLEW_ARB_pixel_buffer_object:
print "Pixel buffer objects are not supported by your card!"
sys.exit(1)
size = 100
pbo = glGenBuffers(1)
glBindBuffer(GL_PIXEL_PACK_BUFFER_ARB, pbo)
glBufferData(GL_PIXEL_PACK_BUFFER_ARB, size*3, None, GL_DYNAMIC_DRAW)
#glPixelStorei(GL_PACK_ALIGNMENT, 4)
#glPixelStorei(GL_UNPACK_ALIGNMENT, 4)
def polar(n):
theta = n*2*pi/size
return cos(theta), sin(theta), 0.0
data = ravel(array(map(polar, range(size)), Float32))
while 1:
event = pygame.event.poll()
if event.type == QUIT or (event.type == KEYDOWN and event.key == K_ESCAPE):
sys.exit(0)
glDrawPixels(size, 1, GL_RGB, GL_FLOAT, data.tostring())
glReadPixels(0, 0, size, 1, GL_RGB, GL_FLOAT, 0);
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
glOrtho(-1, 1, -1, 1, 0.1, 10.0)
glMatrixMode(GL_MODELVIEW)
glLoadIdentity()
glTranslatef(0,0,-1)
glBindBuffer(GL_ARRAY_BUFFER, pbo)
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(3, GL_FLOAT, 0, 0);
#glDrawArrays(GL_LINE_STRIP, 0, size);
glDrawArrays(GL_TRIANGLE_STRIP, 0, size);
pygame.display.flip()
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