def test_freeing(self):
" Test if the shaders are freed correctly"
vert_obj = ShaderObject.vertex()
# Warning, borrowed_obj do not own the underlying shader so it will not be freed automatically
borrowed_obj = ShaderObject(glCreateShader(GL_VERTEX_SHADER), owned=False)
borrowed_sid = borrowed_obj.sid
sid = vert_obj.sid
del vert_obj
del borrowed_obj
gc.collect()
self.assertEqual(GL_FALSE, glIsShader(sid), 'shader object is still valid')
self.assertEqual(GL_TRUE, glIsShader(borrowed_sid), 'shader object was deleted')
#Free the shader object
glDeleteShader(borrowed_sid)
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 shader is valid.
Return True if it is, False otherwise.
"""
return glIsShader(self.sid) == GL_TRUE