~mcfletch/openglcontext/trunk : /OpenGLContext/drawcube.py (revision 351)

"""Low level testing function (draw a cube)

This module provides a simple function for drawing

a cube.  It is used by various modules for low level

testing purposes (i.e. in module-level rather than

system level tests).

This version was taken from the NeHe tutorials,

to replace the original which did not include

texture coordinate information.

"""

from OpenGL.GL import *

from OpenGL.arrays import vbo

from OpenGLContext.arrays import array

from OpenGLContext.scenegraph import box

VBO = None

def drawCube():

	"""Draw a cube 2,2,2 units centered around the origin"""

	# draw six faces of a cube

	global VBO 

	if VBO is None:

		if vbo.get_implementation():

			data = vbo.VBO( array( list(box.yieldVertices( (2,2,2) )), 'f') )

			def draw():

				data.bind()

				try:

					glPushClientAttrib(GL_CLIENT_ALL_ATTRIB_BITS)

					try:

						glEnable( GL_VERTEX_ARRAY )

						glEnable( GL_NORMAL_ARRAY )

						glEnable( GL_TEXTURE_COORD_ARRAY )

						glVertexPointer( 3, GL_FLOAT, 32, data+20 )

						glNormalPointer( GL_FLOAT, 32, data+8 )

						glTexCoordPointer( 2, GL_FLOAT, 32, data )

						glDrawArrays( GL_TRIANGLES, 0, 36 )

					finally:

						glPopClientAttrib()

				finally:

					data.unbind()

			VBO = draw 

		else:

			data = array( list(yieldVertices( (2,2,2) )), 'f')

			def draw():

				try:

					glPushClientAttrib(GL_CLIENT_ALL_ATTRIB_BITS)

					try:

						# interleaved arrays is not 3.1 compatible,

						# but this is the old-code path...

						glInterleavedArrays( GL_T2F_N3F_V3F, 0, data )

						glDrawArrays( GL_TRIANGLES, 0, 36 )

					finally:

						glPopClientAttrib()

				finally:

					data.unbind()

			VBO = draw 

	return VBO()