Problem rendering anything other than text

[jack445]

I've recently started trying make some kind of overlay for wow. The problem I ran into and don't know how to solve is that if I try to render anything other than text, it just won't appear. Strangely enough, if I start Mumble with its overlay enabled everything works just fine (and continues to work even if I close Mumble after that). I've already tried setting some properties for d3device as suggested in other threads that had similar issue (such as VertexShader and PixelShader to null, enabling AlphaBlend etc.) and it didn't seem to fix this issue. Any clue what am I doing wrong?

Correct rendering: https://i.imgur.com/uDLrJ6r.jpg
Incorrect: https://i.imgur.com/PPsTDVs.jpg

EndScene hook code:

                        device.VertexShader = null;
                        device.PixelShader = null;
                        device.SetRenderState(RenderState.AlphaBlendEnable, true);
                        device.SetRenderState(RenderState.BlendOperation, BlendOperation.Add);
                        device.SetRenderState(RenderState.DestinationBlend, Blend.InverseSourceAlpha);
                        device.SetRenderState(RenderState.SourceBlend, Blend.SourceAlpha);
                        device.SetRenderState(RenderState.Lighting, 0);
                        device.SetTexture(0, null);
                        device.SetRenderState(RenderState.CullMode, Cull.None);
                        using (Surface renderTargetTemp = device.GetRenderTarget(0))
                        {
                            int width, height;
                            width = renderTargetTemp.Description.Width;
                            height = renderTargetTemp.Description.Height;

                            if (_renderTarget == null)
                            {
                                using (SwapChain sc = device.GetSwapChain(0))
                                {
                                    _renderTarget = Surface.CreateOffscreenPlain(device, width, height, sc.PresentParameters.BackBufferFormat, Pool.SystemMemory);
                                }
                            }

                            using (Surface resolvedSurface = Surface.CreateRenderTarget(device, width, height, renderTargetTemp.Description.Format, MultisampleType.None, 0, false))
                            {
                                device.StretchRectangle(renderTargetTemp, resolvedSurface, TextureFilter.None);

                                device.GetRenderTargetData(resolvedSurface, _renderTarget);
                            }
                        }
                        
                        // draw letterbox
                        if (_lineVectors == null)
                        {
                            _lineVectors = new SlimDX.Vector2[] { 
                                        new SlimDX.Vector2(0, 0),
                                        new SlimDX.Vector2(_renderTarget.Description.Width - 1, _renderTarget.Description.Height - 1),
                                        new SlimDX.Vector2(0, _renderTarget.Description.Height - 1),
                                        new SlimDX.Vector2(_renderTarget.Description.Width - 1, 0),
                                        new SlimDX.Vector2(0, 0),
                                        new SlimDX.Vector2(0, _renderTarget.Description.Height - 1),
                                        new SlimDX.Vector2(_renderTarget.Description.Width - 1, _renderTarget.Description.Height - 1),
                                        new SlimDX.Vector2(_renderTarget.Description.Width - 1, 0),
                                    };
                        }

                        // draw lines
                        if (_lineVectors != null)
                        {
                            using (SlimDX.Direct3D9.Line line = new SlimDX.Direct3D9.Line(device))
                            {
                                line.Antialias = false;
                                line.Width = 1.0f;
                                line.Begin();
                                line.Draw(_lineVectors, new SlimDX.Color4(1.0f, 0.5f, 0.5f, 1.0f));
                                line.End();
                            }
                        }

                        
                        // random lines in random colors
                        lineData = new LineVertex[100];
                        Random rnd = new Random(DateTime.Now.Millisecond);

                        for (int i = 0; i < lineData.Length; i++)
                        {
                            lineData[i] = new LineVertex();
                            float x = (float)rnd.Next(0, _renderTarget.Description.Width);
                            float y = (float)rnd.Next(0, _renderTarget.Description.Height);
                            float z = 1.0f;
                            lineData[i].Position = new Vector4(x, y, z, 0f);
                            lineData[i].Color = Color.FromArgb(rnd.Next(0, 255), rnd.Next(0, 255), rnd.Next(0, 255)).ToArgb();
                        }
                        device.VertexFormat = LineVertex.Format;
                        device.DrawUserPrimitives<LineVertex>(PrimitiveType.LineList, 0, lineData.Length / 2, lineData);
                        
                        
                        // draw frame rate
                        using (SlimDX.Direct3D9.Font font = new SlimDX.Direct3D9.Font(device, new System.Drawing.Font   ("Arial", 20.0f, FontStyle.Bold)))
                        {
                            if (_lastFrame != null)
                            {
                                if (lastDispSec != _lastFrame.Value.Second)
                                {
                                    lastDispSec = _lastFrame.Value.Second;
                                    fps = (1000.0 / (DateTime.Now - _lastFrame.Value).TotalMilliseconds);
                                    Interface.DebugMessage(this.ProcessId, "Game running at: " + (fps++) + " fps.");
                                }
                                font.DrawString(null, String.Format("{0:N1} fps", fps), 100, 200, System.Drawing.Color.Aqua);
                            }
                            _lastFrame = DateTime.Now;
                        }

Code above draws (as seen on screenshots) a latterbox of size of the current wow window, lines with random start/end points and colors as well as current frame rate. Hook is done using EasyHook, rendering using SlimDX.

[jack445]

Solved by doing this instead:

device.SetRenderState(RenderState.Lighting, false);
                        device.SetRenderState(RenderState.SpecularEnable, false);
                        device.SetRenderState(RenderState.CullMode, Cull.None);
                        device.SetRenderState(RenderState.AlphaBlendEnable, true);
                        device.SetRenderState(RenderState.VertexBlend, VertexBlend.Disable);
                        device.SetRenderState(RenderState.SourceBlend, Blend.SourceAlpha);
                        device.SetRenderState(RenderState.DestinationBlend, Blend.InverseSourceAlpha);
                        device.SetRenderState(RenderState.FillMode, FillMode.Solid);
                        device.SetRenderState(RenderState.ColorWriteEnable, 0xF);
                        device.SetRenderState(RenderState.MultisampleAntialias, false);
                        device.SetTexture(0, null);
                        device.VertexShader = null;
                        device.PixelShader = null;
                        device.VertexDeclaration = null;

This is based on d3dshark ofc, so anyone checking this thread should thank those guys instead