def test_freeing(self):
" Test if programs are freed correctly "
prog = ShaderProgram.new_program()
vert, frag = self.get_objects()
prog.attach(vert, frag)
# Warning, borrowed_obj do not own the underlying shader so it will not be freed automatically
borrowed_prog = ShaderProgram(glCreateProgram(), owned=False)
pid = prog.pid
pid2 = borrowed_prog.pid
del prog
del borrowed_prog
gc.collect()
self.assertEqual(glIsProgram(pid), GL_FALSE, 'Program was not freed')
self.assertEqual(glIsProgram(pid2), GL_TRUE, 'Program was freed')
self.assertFalse(vert.valid(), 'vert was not freed')
self.assertFalse(frag.valid(), 'frag was not freed')
# Free the program object
glDeleteProgram(pid2)
def _uniform_loc_storage_and_type(self, var):
"""Return the uniform location and a container that can
store its value.
Parameters
----------
var : string
Uniform name.
"""
if var not in self.active_uniforms:
raise GLSLError("Uniform '%s' is not active. Make sure the "
"variable is used in the source code." % var)
try:
var_info = self._uniform_type_info[var]
except KeyError:
raise ValueError("Uniform variable '%s' is not defined in "
"shader source." % var)
# If this is an array, how many values are involved?
count = var_info['array']
if var_info['kind'] in ['int']:
data_type = gl.GLint
else:
data_type = gl.GLfloat
assert gl.glIsProgram(self.handle) == True
assert self.linked
loc = gl.glGetUniformLocation(self.handle, var)
if loc == -1:
raise RuntimeError("Could not query uniform location "
"for '%s'." % var)
storage = data_type * (count * var_info['size'])
storage_nested = count * (data_type * var_info['size'])
return loc, storage, storage_nested, data_type
def check_shader_or_program_status(obj):
'''checks if the given shader or program object has been compiled or linked successfully.
Raises an exception if not and deletes the object.
Returns the object otherwise'''
if gl.glIsShader(obj):
getiv = gl.glGetShaderiv
getlog = gl.glGetShaderInfoLog
statusflag = gl.GL_COMPILE_STATUS
delete = gl.glDeleteShader
ErrorClass = ShaderCompileError
elif gl.glIsProgram(obj):
getiv = gl.glGetProgramiv
getlog = gl.glGetProgramInfoLog
statusflag = gl.GL_LINK_STATUS
delete = gl.glDeleteProgram
ErrorClass = ProgramLinkError
else:
raise ValueError('object {} neither shader nor prorgam'.format(obj))
ok = c_int(0)
getiv(obj, statusflag, byref(ok))
if not ok:
errlen = c_int(0)
getiv(obj, gl.GL_INFO_LOG_LENGTH, byref(errlen))
errlen = errlen.value
if errlen <= 0:
error = 'unknown error'
else:
log = ctypes.create_string_buffer('', errlen)
getlog(obj, errlen, None, log)
error = log.value
delete(obj)
raise ErrorClass(error)
else:
return obj
def valid(self):
"""
Check if the underlying program is valid.
Return True if it is, False otherwise.
"""
return glIsProgram(self.pid) == GL_TRUE
