void EnsureDepthBufferAttachment(GlInterface gl)
{
var size = GetPixelSize();
if (size == _depthBufferSize && _depthBuffer != 0)
{
return;
}
gl.GetIntegerv(GL_RENDERBUFFER_BINDING, out var oldRenderBuffer);
if (_depthBuffer != 0)
{
gl.DeleteRenderbuffers(1, new[] { _depthBuffer });
}
var oneArr = new int[1];
gl.GenRenderbuffers(1, oneArr);
_depthBuffer = oneArr[0];
gl.BindRenderbuffer(GL_RENDERBUFFER, _depthBuffer);
gl.RenderbufferStorage(GL_RENDERBUFFER,
GlVersion.Type == GlProfileType.OpenGLES ? GL_DEPTH_COMPONENT16 : GL_DEPTH_COMPONENT,
size.Width, size.Height);
gl.FramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, _depthBuffer);
gl.BindRenderbuffer(GL_RENDERBUFFER, oldRenderBuffer);
}