Re: [pygame] getting setup to use PyOpenGL for 2D

[Jasper <jasper@xxxxxxxx>]

Matt Bailey wrote:

> Speaking of which....anyone got a barebones sample of how to get an 
> OpenGL-ready object from an image file using pygame.image? I'm using PIL 
> right now but only because the only examples I could find used it.
OpenGL is C based state machine (and not object orientated), so I'm not 
exactly sure what you mean....  I'm guessing you want to convert your 
file into a texture for use by OpenGL, and have provided a stripped down 
version of what I use to do this.  This example assumes your image's 
size is a power of 2; you could probably also strip all the 
glTexParameteri() calls and just accept defaults.


import pygame
from OpenGL.GL import *

surf          = pygame.image.load( filePath )
imageStr      = pygame.image.tostring( surf, 'RGBA', 0 )
width, height = surface.get_size()
textureId     = glGenTextures()

glBindTexture(   GL_TEXTURE_2D, textureId )
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T,     GL_REPEAT )
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S,     GL_REPEAT )
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST )
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST )
glTexImage2D(    GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, 
GL_UNSIGNED_BYTE, imageStr )


This sets up the image as a texture inside of OpenGL.  As needed you can 
use this by telling OpenGL to set it's current texture:

glBindTexture( GL_TEXTURE_2D, textureId )

Alternately you can free the associated resources:

glDeleteTextures( textureId )


-Jasper