def draw(self):
planes = self.planes
assert len(planes) <= len(GL_CLIP_PLANE_table), \
"no more than %d clipping planes are permitted" % \
len(GL_CLIP_PLANE_table)
# even if your OpenGL driver supports more -- no sense writing an expr that not everyone can draw!
# WARNING: this ignores the issue of nested Clipped constructs!
# In fact, it assumes nothing in thing or above self uses any clipping planes.
# (Not merely "assumes no more than 6 in all", because we hardcode which specific planes to use!)
# Worse, we don't even detect the error. Fixing the behavior is just as easy
# (let graphical dynenv (self.env) know which planes are still available to any drawing-kid), so do that instead. ##e
# Note that we might need to work inside a display list, and therefore we'd need to get the "next plane to use"
# from an env which stays fixed (or from an env var which is changedtracked), not just from each draw call's caller
# (i.e. a glpane attr).
# enable the planes
for i, plane in zip(range(len(planes)), planes):
assert len(plane) == 4
glEnable( GL_CLIP_PLANE_table[i] )
glClipPlane( GL_CLIP_PLANE_table[i], plane)
# draw thing
self.drawkid( self.thing)
# disable the planes
for i in range(len(planes)):
glDisable( GL_CLIP_PLANE_table[i] )
return
def draw(self):
planes = self.planes
assert len(planes) <= len(GL_CLIP_PLANE_table), \
"no more than %d clipping planes are permitted" % \
len(GL_CLIP_PLANE_table)
# even if your OpenGL driver supports more -- no sense writing an expr that not everyone can draw!
# WARNING: this ignores the issue of nested Clipped constructs!
# In fact, it assumes nothing in thing or above self uses any clipping planes.
# (Not merely "assumes no more than 6 in all", because we hardcode which specific planes to use!)
# Worse, we don't even detect the error. Fixing the behavior is just as easy
# (let graphical dynenv (self.env) know which planes are still available to any drawing-kid), so do that instead. ##e
# Note that we might need to work inside a display list, and therefore we'd need to get the "next plane to use"
# from an env which stays fixed (or from an env var which is changedtracked), not just from each draw call's caller
# (i.e. a glpane attr).
# enable the planes
for i, plane in zip(range(len(planes)), planes):
assert len(plane) == 4
glEnable(GL_CLIP_PLANE_table[i])
glClipPlane(GL_CLIP_PLANE_table[i], plane)
# draw thing
self.drawkid(self.thing)
# disable the planes
for i in range(len(planes)):
glDisable(GL_CLIP_PLANE_table[i])
return
def select(self, wX, wY):
"""
Use the OpenGL picking/selection to select any object. Return the
selected object, otherwise, return None. Restore projection and
modelview matrices before returning.
"""
### NOTE: this code is similar to (and was copied and modified from)
# GLPane_highlighting_methods.do_glselect_if_wanted, but also differs
# in significant ways (too much to make it worth merging, unless we
# decide to merge the differing algorithms as well). It's one of
# several instances of hit-test code that calls glRenderMode.
# [bruce 060721/080917 comment]
wZ = glReadPixelsf(wX, wY, 1, 1, GL_DEPTH_COMPONENT)
gz = wZ[0][0]
if gz >= GL_FAR_Z: # Empty space was clicked
return None
pxyz = A(gluUnProject(wX, wY, gz))
pn = self.out
pxyz -= 0.0002 * pn
# Note: if this runs before the model is drawn, this can have an
# exception "OverflowError: math range error", presumably because
# appropriate state for gluUnProject was not set up. That doesn't
# normally happen but can happen due to bugs (no known open bugs
# of that kind).
# Sometimes our drawing area can become "stuck at gray",
# and when that happens, the same exception can occur from this line.
# Could it be that too many accidental mousewheel scrolls occurred
# and made the scale unreasonable? (To mitigate, we should prevent
# those from doing anything unless we have a valid model, and also
# reset that scale when loading a new model (latter is probably
# already done, but I didn't check). See also the comments
# in def wheelEvent.) [bruce 080220 comment]
dp = -dot(pxyz, pn)
# Save projection matrix before it's changed.
glMatrixMode(GL_PROJECTION)
glPushMatrix()
current_glselect = (wX, wY, 1, 1)
self._setup_projection(glselect=current_glselect)
glSelectBuffer(self.SIZE_FOR_glSelectBuffer)
glRenderMode(GL_SELECT)
glInitNames()
glMatrixMode(GL_MODELVIEW)
# Save model view matrix before it's changed.
glPushMatrix()
# Draw model using glRenderMode(GL_SELECT) as set up above
try:
glClipPlane(GL_CLIP_PLANE0, (pn[0], pn[1], pn[2], dp))
glEnable(GL_CLIP_PLANE0)
self._drawModel_using_DrawingSets()
except:
#bruce 080917 fixed predicted bugs in this except clause (untested)
print_compact_traceback(
"exception in ThumbView._drawModel_using_DrawingSets() during GL_SELECT; ignored; restoring matrices: "
)
glDisable(GL_CLIP_PLANE0)
glMatrixMode(GL_PROJECTION)
glPopMatrix()
glMatrixMode(GL_MODELVIEW)
glPopMatrix()
glRenderMode(GL_RENDER)
return None
else:
glDisable(GL_CLIP_PLANE0)
# Restore model/view matrix
glPopMatrix()
# Restore projection matrix and set matrix mode to Model/View
glMatrixMode(GL_PROJECTION)
glPopMatrix()
glMatrixMode(GL_MODELVIEW)
glFlush()
hit_records = list(glRenderMode(GL_RENDER))
## print "%d hits" % len(hit_records)
for (near, far, names) in hit_records:
## print "hit record: near, far, names:", near, far, names
# note from testing: near/far are too far apart to give actual depth,
# in spite of the 1-pixel drawing window (presumably they're vertices
# taken from unclipped primitives, not clipped ones).
### REVIEW: this just returns the first candidate object found.
# The clip plane may restrict the set of candidates well enough to
# make sure that's the right one, but this is untested and unreviewed.
# (And it's just my guess that that was Huaicai's intention in
# setting up clipping, since it's not documented. I'm guessing that
# the plane is just behind the hitpoint, but haven't confirmed this.)
# [bruce 080917 comment]
if names:
name = names[-1]
assy = self.assy
obj = assy and assy.object_for_glselect_name(name)
#k should always return an obj
return obj
return None # from ThumbView.select
def drawSiCGrid(color, line_type, w, h, up, right):
"""
Draw SiC grid.
"""
if line_type == NO_LINE:
return
XLen = sic_uLen * 3.0
YLen = sic_yU * 2.0
hw = w/2.0; hh = h/2.0
i1 = int(floor(-hw/XLen))
i2 = int(ceil(hw/XLen))
j1 = int(floor(-hh/YLen))
j2 = int(ceil(hh/YLen))
glDisable(GL_LIGHTING)
glColor3fv(color)
if line_type > 1:
glEnable(GL_LINE_STIPPLE)
if line_type == DASHED_LINE:
glLineStipple (1, 0x00FF) # dashed
elif line_type == DOTTED_LINE:
glLineStipple (1, 0x0101) # dotted
else:
print "drawer.drawSiCGrid(): line_type '", line_type, \
"' is not valid. Drawing dashed grid line."
glLineStipple (1, 0x00FF) # dashed
glClipPlane(GL_CLIP_PLANE0, (1.0, 0.0, 0.0, hw))
glClipPlane(GL_CLIP_PLANE1, (-1.0, 0.0, 0.0, hw))
glClipPlane(GL_CLIP_PLANE2, (0.0, 1.0, 0.0, hh))
glClipPlane(GL_CLIP_PLANE3, (0.0, -1.0, 0.0, hh))
glEnable(GL_CLIP_PLANE0)
glEnable(GL_CLIP_PLANE1)
glEnable(GL_CLIP_PLANE2)
glEnable(GL_CLIP_PLANE3)
glPushMatrix()
glTranslate(i1*XLen, j1*YLen, 0.0)
for i in range(i1, i2):
glPushMatrix()
for j in range(j1, j2):
glCallList(SiCGridList)
glTranslate(0.0, YLen, 0.0)
glPopMatrix()
glTranslate(XLen, 0.0, 0.0)
glPopMatrix()
glDisable(GL_CLIP_PLANE0)
glDisable(GL_CLIP_PLANE1)
glDisable(GL_CLIP_PLANE2)
glDisable(GL_CLIP_PLANE3)
if line_type > 1:
glDisable (GL_LINE_STIPPLE)
xpos, ypos = hw, 0.0
f3d = Font3D(xpos=xpos, ypos=ypos, right=right, up=up,
rot90=False, glBegin=False)
for j in range(j1, j2):
yoff = j * YLen
if -hh < yoff + ypos < hh:
f3d.drawString("%-.4g" % yoff, color=color, yoff=yoff)
xpos, ypos = 0.0, hh
f3d = Font3D(xpos=xpos, ypos=ypos, right=right, up=up,
rot90=True, glBegin=False)
for i in range(2*i1, 2*i2):
yoff = i * (XLen/2)
if -hw < yoff + xpos < hw:
f3d.drawString("%-.4g" % yoff, color=color, yoff=yoff)
glEnable(GL_LIGHTING)
return
def set_clip_plane(self, index, coefficients):
glEnable(self.clip_constants[index])
glClipPlane(self.clip_constants[index], coefficients)
def select(self, wX, wY):
"""
Use the OpenGL picking/selection to select any object. Return the
selected object, otherwise, return None. Restore projection and
modelview matrices before returning.
"""
### NOTE: this code is similar to (and was copied and modified from)
# GLPane_highlighting_methods.do_glselect_if_wanted, but also differs
# in significant ways (too much to make it worth merging, unless we
# decide to merge the differing algorithms as well). It's one of
# several instances of hit-test code that calls glRenderMode.
# [bruce 060721/080917 comment]
wZ = glReadPixelsf(wX, wY, 1, 1, GL_DEPTH_COMPONENT)
gz = wZ[0][0]
if gz >= GL_FAR_Z: # Empty space was clicked
return None
pxyz = A(gluUnProject(wX, wY, gz))
pn = self.out
pxyz -= 0.0002 * pn
# Note: if this runs before the model is drawn, this can have an
# exception "OverflowError: math range error", presumably because
# appropriate state for gluUnProject was not set up. That doesn't
# normally happen but can happen due to bugs (no known open bugs
# of that kind).
# Sometimes our drawing area can become "stuck at gray",
# and when that happens, the same exception can occur from this line.
# Could it be that too many accidental mousewheel scrolls occurred
# and made the scale unreasonable? (To mitigate, we should prevent
# those from doing anything unless we have a valid model, and also
# reset that scale when loading a new model (latter is probably
# already done, but I didn't check). See also the comments
# in def wheelEvent.) [bruce 080220 comment]
dp = - dot(pxyz, pn)
# Save projection matrix before it's changed.
glMatrixMode(GL_PROJECTION)
glPushMatrix()
current_glselect = (wX, wY, 1, 1)
self._setup_projection(glselect = current_glselect)
glSelectBuffer(self.SIZE_FOR_glSelectBuffer)
glRenderMode(GL_SELECT)
glInitNames()
glMatrixMode(GL_MODELVIEW)
# Save model view matrix before it's changed.
glPushMatrix()
# Draw model using glRenderMode(GL_SELECT) as set up above
try:
glClipPlane(GL_CLIP_PLANE0, (pn[0], pn[1], pn[2], dp))
glEnable(GL_CLIP_PLANE0)
self._drawModel_using_DrawingSets()
except:
#bruce 080917 fixed predicted bugs in this except clause (untested)
print_compact_traceback("exception in ThumbView._drawModel_using_DrawingSets() during GL_SELECT; ignored; restoring matrices: ")
glDisable(GL_CLIP_PLANE0)
glMatrixMode(GL_PROJECTION)
glPopMatrix()
glMatrixMode(GL_MODELVIEW)
glPopMatrix()
glRenderMode(GL_RENDER)
return None
else:
glDisable(GL_CLIP_PLANE0)
# Restore model/view matrix
glPopMatrix()
# Restore projection matrix and set matrix mode to Model/View
glMatrixMode(GL_PROJECTION)
glPopMatrix()
glMatrixMode(GL_MODELVIEW)
glFlush()
hit_records = list(glRenderMode(GL_RENDER))
## print "%d hits" % len(hit_records)
for (near, far, names) in hit_records:
## print "hit record: near, far, names:", near, far, names
# note from testing: near/far are too far apart to give actual depth,
# in spite of the 1-pixel drawing window (presumably they're vertices
# taken from unclipped primitives, not clipped ones).
### REVIEW: this just returns the first candidate object found.
# The clip plane may restrict the set of candidates well enough to
# make sure that's the right one, but this is untested and unreviewed.
# (And it's just my guess that that was Huaicai's intention in
# setting up clipping, since it's not documented. I'm guessing that
# the plane is just behind the hitpoint, but haven't confirmed this.)
# [bruce 080917 comment]
if names:
name = names[-1]
assy = self.assy
obj = assy and assy.object_for_glselect_name(name)
#k should always return an obj
return obj
return None # from ThumbView.select
def drawSiCGrid(color, line_type, w, h, up, right):
"""
Draw SiC grid.
"""
if line_type == NO_LINE:
return
XLen = sic_uLen * 3.0
YLen = sic_yU * 2.0
hw = w / 2.0
hh = h / 2.0
i1 = int(floor(-hw / XLen))
i2 = int(ceil(hw / XLen))
j1 = int(floor(-hh / YLen))
j2 = int(ceil(hh / YLen))
glDisable(GL_LIGHTING)
glColor3fv(color)
if line_type > 1:
glEnable(GL_LINE_STIPPLE)
if line_type == DASHED_LINE:
glLineStipple(1, 0x00FF) # dashed
elif line_type == DOTTED_LINE:
glLineStipple(1, 0x0101) # dotted
else:
print "drawer.drawSiCGrid(): line_type '", line_type, \
"' is not valid. Drawing dashed grid line."
glLineStipple(1, 0x00FF) # dashed
glClipPlane(GL_CLIP_PLANE0, (1.0, 0.0, 0.0, hw))
glClipPlane(GL_CLIP_PLANE1, (-1.0, 0.0, 0.0, hw))
glClipPlane(GL_CLIP_PLANE2, (0.0, 1.0, 0.0, hh))
glClipPlane(GL_CLIP_PLANE3, (0.0, -1.0, 0.0, hh))
glEnable(GL_CLIP_PLANE0)
glEnable(GL_CLIP_PLANE1)
glEnable(GL_CLIP_PLANE2)
glEnable(GL_CLIP_PLANE3)
glPushMatrix()
glTranslate(i1 * XLen, j1 * YLen, 0.0)
for i in range(i1, i2):
glPushMatrix()
for j in range(j1, j2):
glCallList(SiCGridList)
glTranslate(0.0, YLen, 0.0)
glPopMatrix()
glTranslate(XLen, 0.0, 0.0)
glPopMatrix()
glDisable(GL_CLIP_PLANE0)
glDisable(GL_CLIP_PLANE1)
glDisable(GL_CLIP_PLANE2)
glDisable(GL_CLIP_PLANE3)
if line_type > 1:
glDisable(GL_LINE_STIPPLE)
xpos, ypos = hw, 0.0
f3d = Font3D(xpos=xpos,
ypos=ypos,
right=right,
up=up,
rot90=False,
glBegin=False)
for j in range(j1, j2):
yoff = j * YLen
if -hh < yoff + ypos < hh:
f3d.drawString("%-.4g" % yoff, color=color, yoff=yoff)
xpos, ypos = 0.0, hh
f3d = Font3D(xpos=xpos,
ypos=ypos,
right=right,
up=up,
rot90=True,
glBegin=False)
for i in range(2 * i1, 2 * i2):
yoff = i * (XLen / 2)
if -hw < yoff + xpos < hw:
f3d.drawString("%-.4g" % yoff, color=color, yoff=yoff)
glEnable(GL_LIGHTING)
return
def _enable_stereo(self,
stereo_image,
preserve_colors=False,
no_clipping=False):
"""
Enables stereo rendering.
This should be called before entering a drawing phase
and should be accompanied by a self._disable_stereo call
after the drawing for that phase.
These methods push a modelview matrix on the matrix stack
and modify the matrix.
@param stereo_image: Indicates which stereo image is being drawn
(-1 == left, 1 == right, 0 == stereo is disabled)
@param preserve_colors: Disable color mask manipulations,
which normally occur in anaglyph mode.
(Also disable depth buffer clearing
for 2nd image, which occurs then.)
@param no_clipping: Disable clipping, which normally occurs in
side-by-side mode.
"""
if not self.stereo_enabled:
return
glPushAttrib(GL_TRANSFORM_BIT)
stereo_mode = self.stereo_mode
stereo_separation = self.stereo_separation
stereo_angle = self.stereo_angle
# push the modelview matrix on the stack
glMatrixMode(GL_MODELVIEW)
glPushMatrix()
separation = stereo_separation * self.scale
angle = stereo_angle # might be modified below
if stereo_mode <= 2:
# side-by-side stereo mode
# clip left or right image
# reset the modelview matrix
if not no_clipping:
glPushMatrix() # Note: this might look redundant with the
# glPushMatrix above, but removing it (and its glPopMatrix
# 10 lines below) causes a bug (no image visible).
# Guess: it's needed so the glLoadIdentity needed to set up
# the clipping plane just below has only a temporary effect.
# [bruce 080911 comment]
glLoadIdentity()
if stereo_image == -1:
clip_eq = (-1.0, 0.0, 0.0, 0.0)
else:
clip_eq = (1.0, 0.0, 0.0, 0.0)
# using GL_CLIP_PLANE5 for stereo clipping
glClipPlane(GL_CLIP_PLANE5, clip_eq)
glEnable(GL_CLIP_PLANE5)
glPopMatrix()
# for cross-eyed mode, exchange left and right views
if stereo_mode == 2:
angle *= -1
# translate images for side-by-side stereo
glTranslatef(separation * stereo_image * self.right[0],
separation * stereo_image * self.right[1],
separation * stereo_image * self.right[2])
# rotate the stereo image ("toe-in" method)
glRotatef(angle * stereo_image, self.up[0], self.up[1], self.up[2])
else:
# Anaglyphs stereo mode - Red plus Blue, Cyan, or Green image.
angle *= 0.5
if not preserve_colors:
if stereo_image == -1:
# red image
glColorMask(GL_TRUE, GL_FALSE, GL_FALSE, GL_TRUE)
else:
# clear depth buffer to combine red/blue images
# REVIEW: this would cause bugs in the predraw_glselectdict code
# used for depth-testing selobj candidates. Maybe it does
# not happen then? The name of the flag 'preserve_colors'
# does not say anything about preserving depths.
# Anyway, it *does* happen then, so I think there is a bug.
# Also, remind me, what's the 4th arg to glColorMask?
# [bruce 080911 comment]
#
# piotr 080911 response: You are right. This technically
# causes a bug: the red image is not highlightable,
# but actually when using anaglyph glasses, the bug is not
# noticeable, as both red and blue images converge.
# The bug becomes noticeable if user tries to highlight an
# object without wearing the anaglyph glasses.
# At this point, I think we can either leave it as it is,
# or consider implementing anaglyph stereo by using
# OpenGL alpha blending.
# Also, I am not sure if highlighting problem is the only bug
# that is caused by clearing the GL_DEPTH_BUFFER_BIT.
glClear(GL_DEPTH_BUFFER_BIT)
if stereo_mode == 3:
# blue image
glColorMask(GL_FALSE, GL_FALSE, GL_TRUE, GL_TRUE)
elif stereo_mode == 4:
# cyan image
glColorMask(GL_FALSE, GL_TRUE, GL_TRUE, GL_TRUE)
elif stereo_mode == 5:
# green image
glColorMask(GL_FALSE, GL_TRUE, GL_FALSE, GL_TRUE)
# rotate the stereo image ("toe-in" method)
glRotatef(angle * stereo_image, self.up[0], self.up[1], self.up[2])
return
def select(self, wX, wY):
"""
Use the OpenGL picking/selection to select any object. Return the
selected object, otherwise, return None. Restore projection and
model/view matrices before returning.
"""
####@@@@ WARNING: The original code for this, in GLPane, has been duplicated and slightly modified
# in at least three other places (search for glRenderMode to find them). This is bad; common code
# should be used. Furthermore, I suspect it's sometimes needlessly called more than once per frame;
# that should be fixed too. [bruce 060721 comment]
wZ = glReadPixelsf(wX, wY, 1, 1, GL_DEPTH_COMPONENT)
gz = wZ[0][0]
if gz >= GL_FAR_Z: ##Empty space was clicked
return None
pxyz = A(gluUnProject(wX, wY, gz))
pn = self.out
pxyz -= 0.0002 * pn
# Note: if this runs before the model is drawn, this can have an
# exception "OverflowError: math range error", presumably because
# appropriate state for gluUnProject was not set up. That doesn't
# normally happen but can happen due to bugs (no known open bugs
# of that kind).
# Sometimes our drawing area can become "stuck at gray",
# and when that happens, the same exception can occur from this line.
# Could it be that too many accidental mousewheel scrolls occurred
# and made the scale unreasonable? (To mitigate, we should prevent
# those from doing anything unless we have a valid model, and also
# reset that scale when loading a new model (latter is probably
# already done, but I didn't check).) [bruce 080220 comment]
dp = -dot(pxyz, pn)
# Save projection matrix before it's changed.
glMatrixMode(GL_PROJECTION)
glPushMatrix()
current_glselect = (wX, wY, 1, 1)
self._setup_projection(glselect=current_glselect)
glSelectBuffer(self.glselectBufferSize)
glRenderMode(GL_SELECT)
glInitNames()
glMatrixMode(GL_MODELVIEW)
# Save model view matrix before it's changed.
glPushMatrix()
try:
glClipPlane(GL_CLIP_PLANE0, (pn[0], pn[1], pn[2], dp))
glEnable(GL_CLIP_PLANE0)
self.drawModel()
glDisable(GL_CLIP_PLANE0)
except:
print_compact_traceback("exception in mode.Draw() during GL_SELECT; ignored; restoring modelview matrix: ")
glPopMatrix()
glRenderMode(GL_RENDER)
return None
else:
# Restore model/view matrix
glPopMatrix()
# Restore project matrix and set matrix mode to Model/View
glMatrixMode(GL_PROJECTION)
glPopMatrix()
glMatrixMode(GL_MODELVIEW)
glFlush()
hit_records = list(glRenderMode(GL_RENDER))
if debug_flags.atom_debug and 0:
print "%d hits" % len(hit_records)
for (near, far, names) in hit_records: # see example code, renderpass.py
if debug_flags.atom_debug and 0:
print "hit record: near, far, names:", near, far, names
# e.g. hit record: near, far, names: 1439181696 1453030144 (1638426L,)
# which proves that near/far are too far apart to give actual depth,
# in spite of the 1-pixel drawing window (presumably they're vertices
# taken from unclipped primitives, not clipped ones).
if names:
name = names[-1]
assy = self.assy
obj = assy and assy.object_for_glselect_name(name)
# k should always return an obj
return obj
return None # from ThumbView.select
def set_clip_plane(self, index, coefficients):
glEnable(self.clip_constants[index])
glClipPlane(self.clip_constants[index], coefficients)
def _enable_stereo(self, stereo_image, preserve_colors = False, no_clipping = False):
"""
Enables stereo rendering.
This should be called before entering a drawing phase
and should be accompanied by a self._disable_stereo call
after the drawing for that phase.
These methods push a modelview matrix on the matrix stack
and modify the matrix.
@param stereo_image: Indicates which stereo image is being drawn
(-1 == left, 1 == right, 0 == stereo is disabled)
@param preserve_colors: Disable color mask manipulations,
which normally occur in anaglyph mode.
(Also disable depth buffer clearing
for 2nd image, which occurs then.)
@param no_clipping: Disable clipping, which normally occurs in
side-by-side mode.
"""
if not self.stereo_enabled:
return
glPushAttrib(GL_TRANSFORM_BIT)
stereo_mode = self.stereo_mode
stereo_separation = self.stereo_separation
stereo_angle = self.stereo_angle
# push the modelview matrix on the stack
glMatrixMode(GL_MODELVIEW)
glPushMatrix()
separation = stereo_separation * self.scale
angle = stereo_angle # might be modified below
if stereo_mode <= 2:
# side-by-side stereo mode
# clip left or right image
# reset the modelview matrix
if not no_clipping:
glPushMatrix() # Note: this might look redundant with the
# glPushMatrix above, but removing it (and its glPopMatrix
# 10 lines below) causes a bug (no image visible).
# Guess: it's needed so the glLoadIdentity needed to set up
# the clipping plane just below has only a temporary effect.
# [bruce 080911 comment]
glLoadIdentity()
if stereo_image == -1:
clip_eq = (-1.0, 0.0, 0.0, 0.0)
else:
clip_eq = ( 1.0, 0.0, 0.0, 0.0)
# using GL_CLIP_PLANE5 for stereo clipping
glClipPlane(GL_CLIP_PLANE5, clip_eq)
glEnable(GL_CLIP_PLANE5)
glPopMatrix()
# for cross-eyed mode, exchange left and right views
if stereo_mode == 2:
angle *= -1
# translate images for side-by-side stereo
glTranslatef(separation * stereo_image * self.right[0],
separation * stereo_image * self.right[1],
separation * stereo_image * self.right[2])
# rotate the stereo image ("toe-in" method)
glRotatef(angle * stereo_image,
self.up[0],
self.up[1],
self.up[2])
else:
# Anaglyphs stereo mode - Red plus Blue, Cyan, or Green image.
angle *= 0.5
if not preserve_colors:
if stereo_image == -1:
# red image
glColorMask(GL_TRUE, GL_FALSE, GL_FALSE, GL_TRUE)
else:
# clear depth buffer to combine red/blue images
# REVIEW: this would cause bugs in the predraw_glselectdict code
# used for depth-testing selobj candidates. Maybe it does
# not happen then? The name of the flag 'preserve_colors'
# does not say anything about preserving depths.
# Anyway, it *does* happen then, so I think there is a bug.
# Also, remind me, what's the 4th arg to glColorMask?
# [bruce 080911 comment]
#
# piotr 080911 response: You are right. This technically
# causes a bug: the red image is not highlightable,
# but actually when using anaglyph glasses, the bug is not
# noticeable, as both red and blue images converge.
# The bug becomes noticeable if user tries to highlight an
# object without wearing the anaglyph glasses.
# At this point, I think we can either leave it as it is,
# or consider implementing anaglyph stereo by using
# OpenGL alpha blending.
# Also, I am not sure if highlighting problem is the only bug
# that is caused by clearing the GL_DEPTH_BUFFER_BIT.
glClear(GL_DEPTH_BUFFER_BIT)
if stereo_mode == 3:
# blue image
glColorMask(GL_FALSE, GL_FALSE, GL_TRUE, GL_TRUE)
elif stereo_mode == 4:
# cyan image
glColorMask(GL_FALSE, GL_TRUE, GL_TRUE, GL_TRUE)
elif stereo_mode == 5:
# green image
glColorMask(GL_FALSE, GL_TRUE, GL_FALSE, GL_TRUE)
# rotate the stereo image ("toe-in" method)
glRotatef(angle * stereo_image,
self.up[0],
self.up[1],
self.up[2])
return
def select(self, wX, wY):
"""
Use the OpenGL picking/selection to select any object. Return the
selected object, otherwise, return None. Restore projection and
model/view matrices before returning.
"""
####@@@@ WARNING: The original code for this, in GLPane, has been duplicated and slightly modified
# in at least three other places (search for glRenderMode to find them). This is bad; common code
# should be used. Furthermore, I suspect it's sometimes needlessly called more than once per frame;
# that should be fixed too. [bruce 060721 comment]
wZ = glReadPixelsf(wX, wY, 1, 1, GL_DEPTH_COMPONENT)
gz = wZ[0][0]
if gz >= GL_FAR_Z: ##Empty space was clicked
return None
pxyz = A(gluUnProject(wX, wY, gz))
pn = self.out
pxyz -= 0.0002 * pn
# Note: if this runs before the model is drawn, this can have an
# exception "OverflowError: math range error", presumably because
# appropriate state for gluUnProject was not set up. That doesn't
# normally happen but can happen due to bugs (no known open bugs
# of that kind).
# Sometimes our drawing area can become "stuck at gray",
# and when that happens, the same exception can occur from this line.
# Could it be that too many accidental mousewheel scrolls occurred
# and made the scale unreasonable? (To mitigate, we should prevent
# those from doing anything unless we have a valid model, and also
# reset that scale when loading a new model (latter is probably
# already done, but I didn't check).) [bruce 080220 comment]
dp = -dot(pxyz, pn)
#Save projection matrix before it's changed.
glMatrixMode(GL_PROJECTION)
glPushMatrix()
current_glselect = (wX, wY, 1, 1)
self._setup_projection(glselect=current_glselect)
glSelectBuffer(self.glselectBufferSize)
glRenderMode(GL_SELECT)
glInitNames()
glMatrixMode(GL_MODELVIEW)
# Save model view matrix before it's changed.
glPushMatrix()
try:
glClipPlane(GL_CLIP_PLANE0, (pn[0], pn[1], pn[2], dp))
glEnable(GL_CLIP_PLANE0)
self.drawModel()
glDisable(GL_CLIP_PLANE0)
except:
print_compact_traceback(
"exception in mode.Draw() during GL_SELECT; ignored; restoring modelview matrix: "
)
glPopMatrix()
glRenderMode(GL_RENDER)
return None
else:
# Restore model/view matrix
glPopMatrix()
#Restore project matrix and set matrix mode to Model/View
glMatrixMode(GL_PROJECTION)
glPopMatrix()
glMatrixMode(GL_MODELVIEW)
glFlush()
hit_records = list(glRenderMode(GL_RENDER))
if debug_flags.atom_debug and 0:
print "%d hits" % len(hit_records)
for (near, far,
names) in hit_records: # see example code, renderpass.py
if debug_flags.atom_debug and 0:
print "hit record: near, far, names:", near, far, names
# e.g. hit record: near, far, names: 1439181696 1453030144 (1638426L,)
# which proves that near/far are too far apart to give actual depth,
# in spite of the 1-pixel drawing window (presumably they're vertices
# taken from unclipped primitives, not clipped ones).
if names:
name = names[-1]
assy = self.assy
obj = assy and assy.object_for_glselect_name(name)
#k should always return an obj
return obj
return None # from ThumbView.select