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from ctypes import *
from pyglet import gl
from pyglet.canvas.headless import HeadlessCanvas
from pyglet.libs.egl import egl
from pyglet.libs.egl.egl import *
from .base import CanvasConfig, Config, Context
_fake_gl_attributes = {
'double_buffer': 0,
'stereo': 0,
'aux_buffers': 0,
'accum_red_size': 0,
'accum_green_size': 0,
'accum_blue_size': 0,
'accum_alpha_size': 0
}
class HeadlessConfig(Config):
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])
if self.opengl_api == "gl":
attrs.extend([EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT])
elif self.opengl_api == "gles":
attrs.extend([EGL_RENDERABLE_TYPE, EGL_OPENGL_ES3_BIT])
else:
raise ValueError(f"Unknown OpenGL API: {self.opengl_api}")
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
class HeadlessCanvasConfig(CanvasConfig):
attribute_ids = {
'buffer_size': egl.EGL_BUFFER_SIZE,
'level': egl.EGL_LEVEL, # Not supported
'red_size': egl.EGL_RED_SIZE,
'green_size': egl.EGL_GREEN_SIZE,
'blue_size': egl.EGL_BLUE_SIZE,
'alpha_size': egl.EGL_ALPHA_SIZE,
'depth_size': egl.EGL_DEPTH_SIZE,
'stencil_size': egl.EGL_STENCIL_SIZE,
'sample_buffers': egl.EGL_SAMPLE_BUFFERS,
'samples': egl.EGL_SAMPLES,
}
def __init__(self, canvas, egl_config, config):
super(HeadlessCanvasConfig, self).__init__(canvas, config)
self._egl_config = egl_config
context_attribs = (EGL_CONTEXT_MAJOR_VERSION, config.major_version or 2,
EGL_CONTEXT_MINOR_VERSION, config.minor_version or 0,
EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE, config.forward_compatible or 0,
EGL_CONTEXT_OPENGL_DEBUG, config.debug or 0,
EGL_NONE)
self._context_attrib_array = (egl.EGLint * len(context_attribs))(*context_attribs)
for name, attr in self.attribute_ids.items():
value = egl.EGLint()
egl.eglGetConfigAttrib(canvas.display._display_connection, egl_config, attr, byref(value))
setattr(self, name, value.value)
for name, value in _fake_gl_attributes.items():
setattr(self, name, value)
def compatible(self, canvas):
# TODO check more
return isinstance(canvas, HeadlessCanvas)
def create_context(self, share):
return HeadlessContext(self, share)
class HeadlessContext(Context):
def __init__(self, config, share):
super(HeadlessContext, self).__init__(config, share)
self.display_connection = config.canvas.display._display_connection
self.egl_context = self._create_egl_context(share)
if not self.egl_context:
raise gl.ContextException('Could not create GL context')
def _create_egl_context(self, share):
if share:
share_context = share.egl_context
else:
share_context = None
if self.config.opengl_api == "gl":
egl.eglBindAPI(egl.EGL_OPENGL_API)
elif self.config.opengl_api == "gles":
egl.eglBindAPI(egl.EGL_OPENGL_ES_API)
return egl.eglCreateContext(self.config.canvas.display._display_connection,
self.config._egl_config, share_context,
self.config._context_attrib_array)
def attach(self, canvas):
if canvas is self.canvas:
return
super(HeadlessContext, self).attach(canvas)
self.egl_surface = canvas.egl_surface
self.set_current()
def set_current(self):
egl.eglMakeCurrent(
self.display_connection, self.egl_surface, self.egl_surface, self.egl_context)
super(HeadlessContext, self).set_current()
def detach(self):
if not self.canvas:
return
self.set_current()
gl.glFlush() # needs to be in try/except?
super(HeadlessContext, self).detach()
egl.eglMakeCurrent(
self.display_connection, 0, 0, None)
self.egl_surface = None
def destroy(self):
super(HeadlessContext, self).destroy()
if self.egl_context:
egl.eglDestroyContext(self.display_connection, self.egl_context)
self.egl_context = None
def flip(self):
if not self.egl_surface:
return
egl.eglSwapBuffers(self.display_connection, self.egl_surface)
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