public OpenGLWindowGraphics(OpenGLWindowGraphicsAdapter adapter, Window window, bool vsync)
{
_adapter = adapter;
_window = window ?? throw new ArgumentNullException(nameof(window));
_vsync = vsync;
// Run OpenGL thread
StartThread();
}
private static void InitializeGraphicsAdapter()
{
// Set GLFW hints to use OpenGL 3.2 core (forward compatible)
// We are assuming OpenGL is the only implementation relevant here. Sorry Vulkan!
// In the future if a Vulkan implementation is introduced to Heirloom, we will have to rewrite this
// initialization procedure.
Glfw.SetWindowCreationHint(WindowAttribute.ClientApi, (int)ClientApi.OpenGL);
Glfw.SetWindowCreationHint(WindowAttribute.OpenGLProfile, (int)OpenGLProfile.Core);
Glfw.SetWindowCreationHint(WindowAttribute.OpenGLForwardCompatibility, true);
Glfw.SetWindowCreationHint(WindowAttribute.ContextVersionMajor, 3);
Glfw.SetWindowCreationHint(WindowAttribute.ContextVersionMinor, 2);
// Creates the "sharing window" that is permanently hidden to the user.
// It is used to query window capabilities and assist with sharing OpenGL resources.
// It is also used when shaders or other OpenGL resources that need to be created
// on an OGL bound thread but do not have a clear context available to them.
Glfw.SetWindowCreationHint(WindowAttribute.TransparentFramebuffer, true);
Glfw.SetWindowCreationHint(WindowAttribute.Visible, false);
ShareContext = Glfw.CreateWindow(256, 256, "GLFW Background Window");
// Use share context temporarily to load the GL functions and construct the graphics adapter object...
Glfw.MakeContextCurrent(ShareContext);
{
// Loads the GL functions via GLFW lookup
GL.LoadFunctions(Glfw.GetProcAddress);
// On the desktop we actually use GL 3.2, but the implementation is limited to GLES 3.0 features.
// This is to help make a uniform implementation for supportd on mobile platforms. This however,
// does allow the user to create incompatible shaders between platforms. As mobile is currently not
// a supported project, this is not yet a concern.
GraphicsAdapter = new OpenGLWindowGraphicsAdapter();
GraphicsFactory = GraphicsAdapter as IWindowGraphicsFactory;
GraphicsAdapter.Initialize();
}
Glfw.MakeContextCurrent(WindowHandle.None);
// Reset default window creation hints
Glfw.SetWindowCreationHint(WindowAttribute.FocusOnShow, true);
Glfw.SetWindowCreationHint(WindowAttribute.Visible, true);
}
