def glRenderMode(newMode):
"""Change to the given rendering mode
If the current mode is GL_FEEDBACK or GL_SELECT, return
the current buffer appropriate to the mode
"""
# must get the current mode to determine operation...
from OpenGL.GL import glGetIntegerv
from OpenGL.GL import selection, feedback
currentMode = glGetIntegerv(simple.GL_RENDER_MODE)
try:
currentMode = currentMode[0]
except (TypeError, ValueError, IndexError) as err:
pass
if currentMode in (simple.GL_RENDER, 0):
# no array needs to be returned...
return simple.glRenderMode(newMode)
result = simple.glRenderMode(newMode)
# result is now an integer telling us how many elements were copied...
if result < 0:
if currentMode == simple.GL_SELECT:
raise error.GLError(
simple.GL_STACK_OVERFLOW,
"glSelectBuffer too small to hold selection results",
)
elif currentMode == simple.GL_FEEDBACK:
raise error.GLError(
simple.GL_STACK_OVERFLOW,
"glFeedbackBuffer too small to hold selection results",
)
else:
raise error.GLError(
simple.GL_STACK_OVERFLOW,
"Unknown glRenderMode buffer (%s) too small to hold selection results"
% (currentMode, ),
)
# Okay, now that the easy cases are out of the way...
# Do we have a pre-stored pointer about which the user already knows?
context = platform.GetCurrentContext()
if context == 0:
raise error.Error(
"""Returning from glRenderMode without a valid context!""")
arrayConstant, wrapperFunction = {
simple.GL_FEEDBACK:
(simple.GL_FEEDBACK_BUFFER_POINTER, feedback.parseFeedback),
simple.GL_SELECT: (simple.GL_SELECTION_BUFFER_POINTER,
selection.GLSelectRecord.fromArray),
}[currentMode]
current = contextdata.getValue(arrayConstant)
# XXX check to see if it's the *same* array we set currently!
if current is None:
current = glGetPointerv(arrayConstant)
# XXX now, can turn the array into the appropriate wrapper type...
if wrapperFunction:
current = wrapperFunction(current, result)
return current
def getContext(context=None):
"""Get the context (if passed, just return)
context -- the context ID, if None, the current context
"""
if context is None:
context = platform.GetCurrentContext()
if context == 0:
from OpenGL import error
raise error.Error(
"""Attempt to retrieve context when no valid context""")
return context
simple.GL_STACK_OVERFLOW,
"glFeedbackBuffer too small to hold selection results",
)
else:
raise error.GLError(
simple.GL_STACK_OVERFLOW,
"Unknown glRenderMode buffer (%s) too small to hold selection results"%(
currentMode,
),
)
# Okay, now that the easy cases are out of the way...
# Do we have a pre-stored pointer about which the user already knows?
context = platform.GetCurrentContext()
if context == 0:
raise error.Error(
"""Returning from glRenderMode without a valid context!"""
)
arrayConstant, wrapperFunction = {
simple.GL_FEEDBACK: (simple.GL_FEEDBACK_BUFFER_POINTER,feedback.parseFeedback),
simple.GL_SELECT: (simple.GL_SELECTION_BUFFER_POINTER, selection.GLSelectRecord.fromArray),
}[ currentMode ]
current = contextdata.getValue( arrayConstant )
# XXX check to see if it's the *same* array we set currently!
if current is None:
current = glGetPointerv( arrayConstant )
# XXX now, can turn the array into the appropriate wrapper type...
if wrapperFunction:
current = wrapperFunction( current, result )
return current
# XXX this belongs in the GL module, not here!