def _init_egl(self):
from OpenGL.EGL import EGL_SURFACE_TYPE, EGL_PBUFFER_BIT, EGL_BLUE_SIZE, \
EGL_RED_SIZE, EGL_GREEN_SIZE, EGL_DEPTH_SIZE, \
EGL_COLOR_BUFFER_TYPE, EGL_RGB_BUFFER, EGL_HEIGHT, \
EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT, EGL_CONFORMANT, \
EGL_OPENGL_BIT, EGL_CONFIG_CAVEAT, EGL_NONE, \
EGL_DEFAULT_DISPLAY, EGL_NO_CONTEXT, EGL_WIDTH, \
EGL_OPENGL_API, \
eglGetDisplay, eglInitialize, eglChooseConfig, \
eglBindAPI, eglCreatePbufferSurface, \
eglCreateContext, eglMakeCurrent, EGLConfig
self._egl_display = None
self._egl_surface = None
self._egl_context = None
config_attributes = arrays.GLintArray.asArray([
EGL_SURFACE_TYPE, EGL_PBUFFER_BIT, EGL_BLUE_SIZE, 8, EGL_RED_SIZE,
8, EGL_GREEN_SIZE, 8, EGL_DEPTH_SIZE, 24, EGL_COLOR_BUFFER_TYPE,
EGL_RGB_BUFFER, EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
EGL_CONFORMANT, EGL_OPENGL_BIT, EGL_NONE
])
major, minor = ctypes.c_long(), ctypes.c_long()
num_configs = ctypes.c_long()
configs = (EGLConfig * 1)()
# Cache DISPLAY if necessary and get an off-screen EGL display
orig_dpy = None
if 'DISPLAY' in os.environ:
orig_dpy = os.environ['DISPLAY']
del os.environ['DISPLAY']
self._egl_display = eglGetDisplay(EGL_DEFAULT_DISPLAY)
if orig_dpy is not None:
os.environ['DISPLAY'] = orig_dpy
# Initialize EGL
eglInitialize(self._egl_display, major, minor)
eglChooseConfig(self._egl_display, config_attributes, configs, 1,
num_configs)
# Bind EGL to the OpenGL API
eglBindAPI(EGL_OPENGL_API)
# Create an EGL pbuffer
self._egl_surface = eglCreatePbufferSurface(
self._egl_display, configs[0],
[EGL_WIDTH, self._width, EGL_HEIGHT, self._height, EGL_NONE])
# Create an EGL context
self._egl_context = eglCreateContext(self._egl_display, configs[0],
EGL_NO_CONTEXT, None)
# Make the EGL context current
eglMakeCurrent(self._egl_display, self._egl_surface, self._egl_surface,
self._egl_context)
def make_current(self):
from OpenGL.EGL import eglMakeCurrent, EGL_NO_SURFACE
assert eglMakeCurrent(self._egl_display, EGL_NO_SURFACE,
EGL_NO_SURFACE, self._egl_context)