void DoCleanup()
{
if (_context != null)
{
using (_context.MakeCurrent())
{
var gl = _context.GlInterface;
gl.BindTexture(GL_TEXTURE_2D, 0);
gl.BindFramebuffer(GL_FRAMEBUFFER, 0);
gl.DeleteFramebuffers(1, new[] { _fb });
_fb = 0;
gl.DeleteRenderbuffers(1, new[] { _depthBuffer });
_depthBuffer = 0;
_attachment?.Dispose();
_attachment = null;
_bitmap?.Dispose();
_bitmap = null;
try
{
if (_initialized)
{
_initialized = false;
OnOpenGlDeinit(_context.GlInterface, _fb);
}
}
finally
{
_context.Dispose();
_context = null;
}
}
}
}
void EnsureTextureAttachment()
{
_context.GlInterface.BindFramebuffer(GL_FRAMEBUFFER, _fb);
if (_bitmap == null || _attachment == null || _bitmap.PixelSize != GetPixelSize())
{
_attachment?.Dispose();
_attachment = null;
_bitmap?.Dispose();
_bitmap = null;
_bitmap = new OpenGlBitmap(GetPixelSize(), new Vector(96, 96));
_attachment = _bitmap.CreateFramebufferAttachment(_context);
}
}
private bool EnsureInitializedCore()
{
if (_context != null)
{
return(true);
}
if (_glFailed)
{
return(false);
}
var feature = AvaloniaLocator.Current.GetService <IPlatformOpenGlInterface>();
if (feature == null)
{
return(false);
}
if (!feature.CanShareContexts)
{
Logger.TryGet(LogEventLevel.Error, "OpenGL")?.Log("OpenGlControlBase",
"Unable to initialize OpenGL: current platform does not support multithreaded context sharing");
return(false);
}
try
{
_context = feature.CreateSharedContext();
}
catch (Exception e)
{
Logger.TryGet(LogEventLevel.Error, "OpenGL")?.Log("OpenGlControlBase",
"Unable to initialize OpenGL: unable to create additional OpenGL context: {exception}", e);
return(false);
}
GlVersion = _context.Version;
try
{
_bitmap = new OpenGlBitmap(GetPixelSize(), new Vector(96, 96));
if (!_bitmap.SupportsContext(_context))
{
Logger.TryGet(LogEventLevel.Error, "OpenGL")?.Log("OpenGlControlBase",
"Unable to initialize OpenGL: unable to create OpenGlBitmap: OpenGL context is not compatible");
return(false);
}
}
catch (Exception e)
{
_context.Dispose();
_context = null;
Logger.TryGet(LogEventLevel.Error, "OpenGL")?.Log("OpenGlControlBase",
"Unable to initialize OpenGL: unable to create OpenGlBitmap: {exception}", e);
return(false);
}
using (_context.MakeCurrent())
{
try
{
_depthBufferSize = GetPixelSize();
var gl = _context.GlInterface;
var oneArr = new int[1];
gl.GenFramebuffers(1, oneArr);
_fb = oneArr[0];
gl.BindFramebuffer(GL_FRAMEBUFFER, _fb);
EnsureDepthBufferAttachment(gl);
EnsureTextureAttachment();
return(CheckFramebufferStatus(gl));
}
catch (Exception e)
{
Logger.TryGet(LogEventLevel.Error, "OpenGL")?.Log("OpenGlControlBase",
"Unable to initialize OpenGL FBO: {exception}", e);
return(false);
}
}
}