public ImGuiIOPtr(IntPtr nativePtr)
{
NativePtr = (ImGuiIO *)nativePtr;
}
public ImGuiIOPtr(ImGuiIO *nativePtr)
{
NativePtr = nativePtr;
}
public RendererBackend(string?glslVersion)
{
ImGuiIO *io = ImGui.GetIO();
if (io->BackendRendererUserData != null)
{
throw new InvalidOperationException("A renderer backend has already been initialized for the current Dear ImGui context!");
}
// Unlike the native bindings we have an object associated with each context so we generally don't use the BackendRendererUserData and instead enforce
// a 1:1 relationship between backend instances and Dear ImGui contexts. However we still use a GC handle in BackendRendererUserData for our platform callbacks.
Context = ImGui.GetCurrentContext();
ThisHandle = GCHandle.Alloc(this, GCHandleType.Weak);
io->BackendRendererUserData = (void *)GCHandle.ToIntPtr(ThisHandle);
// Set the backend name
{
string name = GetType().FullName ?? nameof(RendererBackend);
int nameByteCount = Encoding.UTF8.GetByteCount(name) + 1;
byte * nameP = (byte *)ImGui.MemAlloc((nuint)nameByteCount);
io->BackendRendererName = nameP;
Span <byte> nameSpan = new(nameP, nameByteCount);
int encodedByteCount = Encoding.UTF8.GetBytes(name.AsSpan().Slice(0, nameSpan.Length - 1), nameSpan);
nameSpan[encodedByteCount] = 0; // Null terminator
}
// Query for GL version (e.g. 320 for GL 3.2)
{
int major = GL.GetInteger(GetPName.MajorVersion);
int minor = GL.GetInteger(GetPName.MinorVersion);
if (major == 0 && minor == 0)
{
throw new NotSupportedException("Ancient versions of OpenGL which do not support version queries are not supported.");
}
GlVersion = major * 100 + minor * 10;
}
//TODO: Handle GLES
if (GlVersion >= 320)
{
io->BackendFlags |= ImGuiBackendFlags.RendererHasVtxOffset;
} // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
io->BackendFlags |= ImGuiBackendFlags.RendererHasViewports; // We can create multi-viewports on the Renderer side (optional)
// Store GLSL version string so we can refer to it later in case we recreate shaders.
// Note: GLSL version is NOT the same as GL version. Leave this to NULL if unsure.
if (glslVersion is null)
{
//TODO: Handle GLES
if (OperatingSystem.IsMacOS())
{
glslVersion = "#version 150";
}
else
{
glslVersion = "#version 130";
}
}
GlslVersionString = glslVersion;
// Detect extensions we support
HasClipOrigin = GlVersion >= 450;
//TODO: Handle GLES
int extensionCount = GL.GetInteger(GetPName.NumExtensions);
for (int i = 0; i < extensionCount; i++)
{
if (GL.GetString(StringNameIndexed.Extensions, i) == "GL_ARB_clip_control")
{
HasClipOrigin = true;
}
}
if (io->ConfigFlags.HasFlag(ImGuiConfigFlags.ViewportsEnable))
{
// ImGui_ImplOpenGL3_InitPlatformInterface
ImGui.GetPlatformIO()->Renderer_RenderWindow = &RenderWindow;
public abstract void ImGuiIO_AddInputCharacter(ImGuiIO *self, ushort c);
public abstract void ImGuiIO_ImGuiIO(ImGuiIO *self);
public abstract void ImGuiIO_ClearInputCharacters(ImGuiIO *self);
public abstract void ImGuiIO_AddInputCharactersUTF8(ImGuiIO *self, byte *utf8_chars);
