def match(self, canvas):
if not isinstance(canvas, HeadlessCanvas):
raise RuntimeError('Canvas must be an instance of HeadlessCanvas')
display_connection = canvas.display._display_connection
# Construct array of attributes
attrs = []
for name, value in self.get_gl_attributes():
if name == 'double_buffer':
continue
attr = HeadlessCanvasConfig.attribute_ids.get(name, None)
if attr and value is not None:
attrs.extend([attr, int(value)])
attrs.extend([EGL_SURFACE_TYPE, EGL_PBUFFER_BIT])
attrs.extend([EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT])
attrs.extend([EGL_NONE])
attrs_list = (egl.EGLint * len(attrs))(*attrs)
num_config = egl.EGLint()
egl.eglChooseConfig(display_connection, attrs_list, None, 0,
byref(num_config))
configs = (egl.EGLConfig * num_config.value)()
egl.eglChooseConfig(display_connection, attrs_list, configs,
num_config.value, byref(num_config))
result = [HeadlessCanvasConfig(canvas, c, self) for c in configs]
return result
# Get the number of configs:
num_configs = libegl.EGLint()
config_size = libegl.EGLint()
result = libegl.eglGetConfigs(display_connection, None, config_size,
num_configs)
assert result == 1, "Failed to query Configs"
print("Number of configs available: ", num_configs.value)
# Choose a config:
config_attribs = (EGL_SURFACE_TYPE, EGL_PBUFFER_BIT, EGL_BLUE_SIZE, 8,
EGL_GREEN_SIZE, 8, EGL_RED_SIZE, 8, EGL_DEPTH_SIZE, 8,
EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT, EGL_NONE)
config_attrib_array = (libegl.EGLint * len(config_attribs))(*config_attribs)
egl_config = libegl.EGLConfig()
result = libegl.eglChooseConfig(display_connection, config_attrib_array,
egl_config, 1, num_configs)
assert result == 1, "Failed to choose Config"
# Create a surface:
pbufferwidth = 1
pbufferheight = 1
pbuffer_attribs = (EGL_WIDTH, pbufferwidth, EGL_HEIGHT, pbufferheight,
EGL_NONE)
pbuffer_attrib_array = (libegl.EGLint * len(pbuffer_attribs))(*pbuffer_attribs)
surface = libegl.eglCreatePbufferSurface(display_connection, egl_config,
pbuffer_attrib_array)
print("Surface id: ", surface)
# Bind the API:
result = libegl.eglBindAPI(libegl.EGL_OPENGL_API)
assert result == 1, "Failed to bind EGL_OPENGL_API"