Re: [pygame] open gl blit

["Pete Shinners" <shredwheat@mediaone.net>]

> It seem open gl blit don't work even with
> OPENGL|DOUBLEBUF|OPENGLBLIT flag any one success
> blit to or from opengl screen ?

i've never actually done anything with the OPENGLBLIT mode.
i just did some simple testing (following along the C SDL
example) but i couldn't get the blit to draw anything.

i'll try to figure out why that is, but i don't think its
a big deal. just use the standard GL functions to blit
a 2d image to the screen. remember, opengl's coordinate
system is bottom to top, opposite of SDL/pygame.

here's some code that shows that....




import pygame, pygame.image
from pygame.locals import *
from OpenGL.GL import *

#create opengl screen and clear it
pygame.init()
screen = pygame.display.set_mode((300,300), OPENGL)
glClear(GL_COLOR_BUFFER_BIT)


#load image and get pixel buffer
image = pygame.image.load('cowbaby.ppm')
pixels = pygame.image.tostring(image, 'RGBA', 1)
size = image.get_size()


#setup opengl for 2d drawing
glOrtho(0, 300, 0, 300, 0, 1)


#show the image onscreen
glRasterPos2i(20,20)
glDrawPixels(size[0], size[1], GL_RGBA, GL_UNSIGNED_BYTE, pix)



#all done!
pygame.event.pump()
pygame.time.delay(1000)

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