How many draw calls per frame are possible without awful performance?

Gary Toofany · 2013-03-07T15:56:43

I have just completed attempts to write my own sprite batch class in C# using SlimDX, in direct response to performance problems in my game. Basically I draw the game area (pacman) in tiles, with each tile drawn using a draw call to the sprite renderer object. I am now using a decent sprite renderer (http://sdxspritetext.codeplex.com/wikipage?title=Concepts%20of%20the%20SpriteRenderer) but find that my performance problem remains the same! Basically I was fine with a 10x10 tile game area, but after scaling up to 30x15, the performance is terrble. Literally 5 frames per second. How should I be handling the drawing of game tiles in this scenario? Or could there be something else wrong with the way in which I've got things set up? My graphics device set-up code is as follows (excuse the mess): // >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> // START: Method InitialiseGraphics // >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> public void InitialiseGraphics() { bool debug=false; if(debug){MessageBox.Show( "InitialiseGraphics()...");} description = new SlimDX.DXGI.SwapChainDescription() { BufferCount = 2, Usage = SlimDX.DXGI.Usage.RenderTargetOutput, OutputHandle = this.Handle, IsWindowed = true, ModeDescription = new SlimDX.DXGI.ModeDescription(0, 0, new SlimDX.Rational(60, 1), SlimDX.DXGI.Format.R8G8B8A8_UNorm), SampleDescription = new SlimDX.DXGI.SampleDescription(1, 0), Flags = SlimDX.DXGI.SwapChainFlags.AllowModeSwitch, SwapEffect = SlimDX.DXGI.SwapEffect.Discard }; if(debug){MessageBox.Show( "InitialiseGraphics()...1");} SlimDX.Direct3D11.FeatureLevel[] featureLevels = new SlimDX.Direct3D11.FeatureLevel[] { SlimDX.Direct3D11.FeatureLevel.Level_10_1 }; if(debug){MessageBox.Show( "InitialiseGraphics()...2");} // 02/09/12: Change constructor to enable text writing! SlimDX.Direct3D11.Device.CreateWithSwapChain( adapter1, SlimDX.Direct3D11.DeviceCreationFlags.Debug, featureLevels, description, out graphics, out swapChain ); if(debug){MessageBox.Show( "InitialiseGraphics()...3");} // create a view of our render target, which is the backbuffer of the swap chain we just created using (var resource = SlimDX.Direct3D11.Resource.FromSwapChain<SlimDX.Direct3D11.Texture2D>(swapChain, 0)) renderTarget = new SlimDX.Direct3D11.RenderTargetView(graphics, resource); if(debug){MessageBox.Show( "InitialiseGraphics()...4");} // setting a viewport is required if you want to actually see anything context = graphics.ImmediateContext; var viewport = new SlimDX.Direct3D11.Viewport(0.0f, 0.0f, this.ClientSize.Width, this.ClientSize.Height); context.OutputMerger.SetTargets(renderTarget); context.Rasterizer.SetViewports(viewport); if(debug){MessageBox.Show( "InitialiseGraphics()...5");} bsd = new SlimDX.Direct3D11.BlendStateDescription(); bsd.RenderTargets[0].BlendEnable = true; bsd.RenderTargets[0].SourceBlend = SlimDX.Direct3D11.BlendOption.SourceAlpha; bsd.RenderTargets[0].DestinationBlend = SlimDX.Direct3D11.BlendOption.InverseSourceAlpha; bsd.RenderTargets[0].BlendOperation = SlimDX.Direct3D11.BlendOperation.Add; bsd.RenderTargets[0].SourceBlendAlpha = SlimDX.Direct3D11.BlendOption.One; bsd.RenderTargets[0].DestinationBlendAlpha = SlimDX.Direct3D11.BlendOption.Zero; bsd.RenderTargets[0].BlendOperationAlpha = SlimDX.Direct3D11.BlendOperation.Add; bsd.RenderTargets[0].RenderTargetWriteMask = SlimDX.Direct3D11.ColorWriteMaskFlags.All; BlendState_Transparent = SlimDX.Direct3D11.BlendState.FromDescription(graphics, bsd); context.OutputMerger.BlendState = BlendState_Transparent; // ... END // --------------------------------------------------------------------------------------------------------------------------- if(debug){MessageBox.Show( "InitialiseGraphics()...5.5");} SlimDX.Direct3D11.RasterizerStateDescription rasterizerStateDescription = new SlimDX.Direct3D11.RasterizerStateDescription { CullMode = SlimDX.Direct3D11.CullMode.None, FillMode = SlimDX.Direct3D11.FillMode.Solid }; context.Rasterizer.State = SlimDX.Direct3D11.RasterizerState.FromDescription(graphics, rasterizerStateDescription); if(debug){MessageBox.Show( "InitialiseGraphics()...6");} // load and compile the vertex shader (from the FX file) using (var bytecode = SlimDX.D3DCompiler.ShaderBytecode.CompileFromFile("D:\\Programming\\SharpDevelop_Projects\\SlimDX_StartOver\\BasicWindow_1\\BasicWindow_1\\triangle8.fx", "TextVS", "vs_4_0", SlimDX.D3DCompiler.ShaderFlags.None, SlimDX.D3DCompiler.EffectFlags.None)) { inputSignature = SlimDX.D3DCompiler.ShaderSignature.GetInputSignature(bytecode); vertexShader = new SlimDX.Direct3D11.VertexShader(graphics, bytecode); } if(debug){MessageBox.Show( "InitialiseGraphics()...7");} // load and compile the pixel shader (from the FX file) using (var bytecode = SlimDX.D3DCompiler.ShaderBytecode.CompileFromFile("D:\\Programming\\SharpDevelop_Projects\\SlimDX_StartOver\\BasicWindow_1\\BasicWindow_1\\triangle8.fx", "TextPS", "ps_4_0", SlimDX.D3DCompiler.ShaderFlags.None, SlimDX.D3DCompiler.EffectFlags.None)) pixelShader = new SlimDX.Direct3D11.PixelShader(graphics, bytecode); if(debug){MessageBox.Show( "InitialiseGraphics()... TEXTURE CODE....2");} // SamplerDescription // GT 17/07/12: Check this against the DX11 book!!!! // samplerDescription = new SlimDX.Direct3D11.SamplerDescription(); samplerDescription.AddressU = SlimDX.Direct3D11.TextureAddressMode.Wrap; samplerDescription.AddressV = SlimDX.Direct3D11.TextureAddressMode.Wrap; samplerDescription.AddressW = SlimDX.Direct3D11.TextureAddressMode.Wrap; samplerDescription.ComparisonFunction = SlimDX.Direct3D11.Comparison.Never; samplerDescription.Filter = SlimDX.Direct3D11.Filter.MinPointMagMipLinear; if(debug){MessageBox.Show( "InitialiseGraphics()... TEXTURE CODE....3");} // SamplerState SlimDX.Direct3D11.SamplerState samplerState = SlimDX.Direct3D11.SamplerState.FromDescription(graphics, samplerDescription); if(debug){MessageBox.Show( "InitialiseGraphics()... TEXTURE CODE....4");} context.PixelShader.SetSampler(samplerState,0); if(debug){MessageBox.Show( "InitialiseGraphics()... TEXTURE CODE....7");} // 26/08/12: START // -------------------- // INPUT ELEMENTS // ---------------------- var elements = new[] { new SlimDX.Direct3D11.InputElement("POSITION", 0, SlimDX.DXGI.Format.R32G32B32_Float, 0), new SlimDX.Direct3D11.InputElement("TEXCOORD", 0, SlimDX.DXGI.Format.R32G32_Float, 0) }; if(debug){MessageBox.Show( "InitialiseGraphics()... TEXTURE CODE....8");} layout = new SlimDX.Direct3D11.InputLayout(graphics, inputSignature, elements); if(debug){MessageBox.Show( "InitialiseGraphics()... TEXTURE CODE....9");} // -------------------------------------------------------------------------------------------------------------------- // ------------------------------------------- // INPUT ASSEMBLER: Layout & PrimitiveTopology // ------------------------------------------- context.InputAssembler.InputLayout = layout; if(debug){MessageBox.Show( "InitialiseGraphics()... TEXTURE CODE....10");} context.InputAssembler.PrimitiveTopology = SlimDX.Direct3D11.PrimitiveTopology.TriangleStrip; // ----------------------------------------------------------------------- if(debug){MessageBox.Show( "InitialiseGraphics()... TEXTURE CODE....11");} // Added these because of the awful crashing incident. Might fix it? // set the shaders context.VertexShader.Set(vertexShader); context.PixelShader.Set(pixelShader); if(debug){MessageBox.Show( "InitialiseGraphics()... TEXTURE CODE....12");} // Clear the screen... context.ClearRenderTargetView(renderTarget, new SlimDX.Color4(0.0f, 0.0f, 0.0f)); // 26/08/12: END if(debug){MessageBox.Show( "InitialiseGraphics()... TEXTURE CODE....13");} } // >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> // END: Method InitialiseGraphics // >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> I'm slightly baffled, as I didn't think I'd hit this problem what with the power of hardware these days. Wierd. Clearly I'm doing something very silly.

For Beginners

Started by CdrTomalak February 28, 2013 12:30 PM

9 comments, last by Kaptein 11 years, 1 month ago

Kaptein

2,226

March 07, 2013 03:56 PM

Thanks all.

I have written a routine to group draw calls by texture, and this helps a massive amount. The game is now zipping along. The profiler has been really useful, and I'm a fool for not using it before!

I can only speak for myself, but I wouldn't be here myself, if I wasnt a fool.

You can turn it around too, and say that any game developers that doesn't use gamedev as an awesome source of information and knowledge, is the greater fool!

How many draw calls per frame are possible without awful performance?

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