Tian

I got the same issue at [Line 1091 of `renderer.py`](https://github.com/mmatl/pyrender/blob/9ddad1da09582b79a2dd647afc4263899331c128/pyrender/renderer.py#L1091). Furthermore, I checked `GL_MAX_SAMPLES` ``` glGetIntegerv(GL_MAX_SAMPLES) # returns 1 ``` However, the [spec](https://www.khronos.org/opengl/wiki/GLAPI/glGet) said it should be at least `4`,...

[Update] For the **error**, my fixture is at [Line 1091](https://github.com/mmatl/pyrender/blob/9ddad1da09582b79a2dd647afc4263899331c128/pyrender/renderer.py#L1091) and [1096](https://github.com/mmatl/pyrender/blob/9ddad1da09582b79a2dd647afc4263899331c128/pyrender/renderer.py#L1096): ``` num_samples = min(glGetIntegerv(GL_MAX_SAMPLES), 4) # No more than GL_MAX_SAMPLES glRenderbufferStorageMultisample(GL_RENDERBUFFER, num_samples, GL_RGBA, self.viewport_width, self.viewport_height) glRenderbufferStorageMultisample(GL_RENDERBUFFER, num_samples, GL_DEPTH_COMPONENT24,...