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# Blender.BGL module (OpenGL wrapper)
"""
The Blender.BGL submodule (the OpenGL wrapper).
The Blender.BGL submodule
=========================
This module wraps OpenGL constants and functions, making them available from
within Blender Python.
The complete list can be retrieved from the module itself, by listing its
contents: dir(Blender.BGL). There are too many to be documented here, but
a simple search on the net can point to more than enough material to teach
OpenGL programming, from books to many collections of tutorials.
The "red book": "I{OpenGL Programming Guide: The Official Guide to Learning
OpenGL}" and the online NeHe tutorials are two of the best resources.
@see: U{www.opengl.org}
Example::
import Blender
from Blender.BGL import *
from Blender import Draw
R = G = B = 0
A = 1
instructions = "Hold mouse buttons to change the background color."
quitting = " Press ESC or q to quit."
#
def show_win():
glClearColor(R,G,B,A) # define color used to clear buffers
glClear(GL_COLOR_BUFFER_BIT) # use it to clear the color buffer
glColor3f(1,1,1) # change default color
glRasterPos2i(50,100) # move cursor to x = 50, y = 100
Draw.Text("Testing BGL + Draw") # draw this text there
glRasterPos2i(350,20) # move cursor again
Draw.Text(instructions + quitting) # draw another msg
glBegin(GL_LINE_LOOP) # begin a vertex-data list
glVertex2i(46,92)
glVertex2i(120,92)
glVertex2i(120,115)
glVertex2i(46,115)
glEnd() # close this list
glColor3f(0.35,0.18,0.92) # change default color again
glBegin(GL_POLYGON) # another list, for a polygon
glVertex2i(315, 292)
glVertex2i(412, 200)
glVertex2i(264, 256)
glEnd()
Draw.Redraw(1) # make changes visible.
#
def ev(evt, val): # this is a callback for Draw.Register()
global R,G,B,A # ... it handles input events
if evt == Draw.ESCKEY or evt == Draw.QKEY:
Draw.Exit() # this quits the script
elif evt == Draw.LEFTMOUSE: R = 1 - R
elif evt == Draw.MIDDLEMOUSE: G = 1 - G
elif evt == Draw.RIGHTMOUSE: B = 1 - B
else:
Draw.Register(show_win, ev, None)
#
Draw.Register(show_win, ev, None) # start the main loop
"""
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