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Member Since 28 Feb 2009
Offline Last Active Apr 12 2013 12:48 AM

Topics I've Started

Direct3D 11 not rasterizing any vertices

19 January 2013 - 09:14 AM

I'm trying to render a simple triangle on screen using Direct3D 11, but nothing shows up. Here are my vertices:

SimpleVertex vertices[] = {
    { XMFLOAT3(-1.0f, -1.0f, 0.0f) },
    { XMFLOAT3( 1.0f, -1.0f, 0.0f) },
    { XMFLOAT3( -1.0f, 1.0f, 0.0f) },

The expected output is a triangle with one point in the top left corner of the screen, one point in the top right corner of the screen, and one point in the bottom left corner of the screen. However, nothing is being rendered anywhere.

I'm not performing any matrix transformations, and the vertex shader just passes the input directly to the output. Everything seems to be set up correctly, and when I use the graphics debugger in Visual Studio 2012, the correct vertex position is being passed to the vertex shader. However, it skips directly from the vertex shader stage to the output merger stage in the pipeline. I assume this means that nothing is being sent to the pixel shader, which would again mean that the vectors are being discarded in the rasterizer stage. Why is this happening?
Here is my rasterizer state:

D3D11_RASTERIZER_DESC rasterizerDesc;
rasterizerDesc.AntialiasedLineEnable = false;
rasterizerDesc.CullMode = D3D11_CULL_NONE;
rasterizerDesc.DepthBias = 0;
rasterizerDesc.DepthBiasClamp = 0.0f;
rasterizerDesc.DepthClipEnable = true;
rasterizerDesc.FillMode = D3D11_FILL_SOLID;
rasterizerDesc.FrontCounterClockwise = false;
rasterizerDesc.MultisampleEnable = false;
rasterizerDesc.ScissorEnable = false;
rasterizerDesc.SlopeScaledDepthBias = 0.0f;

And my viewport (width/height are the window client area matching my back buffer, which are set to 1024x576 in my test setup):

D3D11_VIEWPORT viewport;
viewport.Height = static_cast< float >( height );
viewport.MaxDepth = 1.0f;
viewport.MinDepth = 0.0f;
viewport.TopLeftX = 0.0f;
viewport.TopLeftY = 0.0f;
viewport.Width = static_cast< float >( width );

Can anyone see what is making the rasterize stage skip my vertices? Or are there any other parts of my D3D setup that could be causing this?

Unable to get depth working in 2D engine

15 January 2013 - 02:59 PM

TL;DR: skip the first 3 paragraphs.


Hi! I've been toying around with building a 2D engine from scratch using Direct3D 11 for about a week, but I feel I'm in pretty deep water now and I could use some help. I'm very new to D3D, and I never used D3D9 for example, so most of what I've been able to accomplish is from looking at RasterTek's tutorials, and reading the MSDN documentation. Since 2D has been the plan all the way, I've ignored (and completely forgotten about) the Z dimension, but I feel it could come in handy again now for the rendered order of sprites, as my current approach seems very convoluted and inefficient.


First off, I have a stack of Scene objects to control the game state, inspired by the ScreenManager sample from XNA a while back. The scenes are updated from the top down, and when a Scene is closed (such as a menu for example) it is popped off the stack so the focus drops down to the next Scene, which could be the actual game in this example. Pointers to these Scene objects are then sent to my render subsystem and stacked in reverse order, as these will need to be rendered from the bottom up. This part works, and the scenes are rendered in the correct order.


However, I would also like to be able to give different layers to the renderables in a Scene, such as setting text on top of sprites for menus. This is where it currently gets iffy. Currently, I have a std::map with the Scene pointer as its key, and then a std::set of Renderable objects as the value. This set is sorted by a functor that compares a Z index value set for each individual Renderable object. Lower indices are rendered below the higher ones. The good thing about this system is that it works; it does what it's supposed to. The bad thing is that it'll probably become incredibly slow once I get to a certain number of Renderables in the set, because of the logarithmic insert/removes. Since the set doesn't sort itself, it's very impractical to change a Renderable's Z value as well, because I then have to remove it and add it to the set again.


What struck me after quite a while of fighting with this problem, though, is... why am I reimplementing something that is already done natively by the graphics card in 3D applications? Instead of a set, why not just use a std::vector with the Renderables, set their Z position as well to represent their respective layering order, and let the graphics card handle the depth ordering of my vertices. So that's what I'm trying to do now, but I can't get it to work. At first I just tried to set the Z component of the position, but it just ignored that and rendered the Renderables in the order they were added to the vector instead. I hadn't set up a depth buffer, so I did that as well, but then I just get a blank screen. I'm too new with D3D to understand what's going on, and I'm not sure what information you guys might need to try and help me, so I'll just post what I think could be relevant.


The 2D orthographic view-projection matrix that's passed to my vertex shader:

XMMATRIX viewMatrix = XMMatrixIdentity();
XMMATRIX projectionMatrix = XMMatrixOrthographicOffCenterLH( 0.0f, resX, resY, 0.0f, minZ, maxZ );
XMMATRIX viewProjectionMatrix = XMMatrixMultiplyTranspose( viewMatrix, projectionMatrix );

XMStoreFloat4x4( &mViewProjectionMatrix, viewProjectionMatrix );


MinZ and MaxZ are currently set to -100.0f and 100.0f respectively, and Renderables are by default placed at Z 0.0f. ResX and ResY are the screen resolution, 1024x576 with the current defaults.


My viewport:

vp.Width	= resX;
vp.Height	= resY;
vp.MinDepth	= 0.0f;
vp.MaxDepth	= 1.0f;
vp.TopLeftX	= 0.0f;
vp.TopLeftY	= 0.0f;


My active rasterizer state:

rasterizerDescs[ 0 ].AntialiasedLineEnable	= true;
rasterizerDescs[ 0 ].CullMode			= D3D11_CULL_NONE;
rasterizerDescs[ 0 ].DepthBias			= 0;
rasterizerDescs[ 0 ].DepthBiasClamp		= 0.0f;
rasterizerDescs[ 0 ].DepthClipEnable		= true;
rasterizerDescs[ 0 ].FillMode			= D3D11_FILL_SOLID;
rasterizerDescs[ 0 ].FrontCounterClockwise	= false;
rasterizerDescs[ 0 ].MultisampleEnable		= true;
rasterizerDescs[ 0 ].ScissorEnable		= false;
rasterizerDescs[ 0 ].SlopeScaledDepthBias	= 0.0f;


My attempted, but non-working, depth stencil state/view:

D3D11_TEXTURE2D_DESC depthTextureDesc;
depthTextureDesc.BindFlags				= D3D11_BIND_DEPTH_STENCIL;
depthTextureDesc.Height					= backBufferDesc.Height;
depthTextureDesc.Width					= backBufferDesc.Width;
depthTextureDesc.MipLevels				= 1;
depthTextureDesc.ArraySize				= 1;
depthTextureDesc.Format					= DXGI_FORMAT_D32_FLOAT_S8X24_UINT;
depthTextureDesc.SampleDesc.Count			= 1;
depthTextureDesc.SampleDesc.Quality			= 0;
depthTextureDesc.Usage					= D3D11_USAGE_DEFAULT;
depthTextureDesc.CPUAccessFlags				= 0;
depthTextureDesc.MiscFlags				= 0;

stencilDesc.BackFace.StencilFailOp		= D3D11_STENCIL_OP_KEEP;
stencilDesc.BackFace.StencilDepthFailOp		= D3D11_STENCIL_OP_DECR;
stencilDesc.BackFace.StencilPassOp		= D3D11_STENCIL_OP_KEEP;
stencilDesc.BackFace.StencilFunc		= D3D11_COMPARISON_ALWAYS;
stencilDesc.DepthEnable				= true;
stencilDesc.DepthWriteMask			= D3D11_DEPTH_WRITE_MASK_ALL;
stencilDesc.DepthFunc				= D3D11_COMPARISON_LESS;
stencilDesc.FrontFace.StencilFailOp		= D3D11_STENCIL_OP_KEEP;
stencilDesc.FrontFace.StencilDepthFailOp	= D3D11_STENCIL_OP_INCR;
stencilDesc.FrontFace.StencilPassOp		= D3D11_STENCIL_OP_KEEP;
stencilDesc.FrontFace.StencilFunc		= D3D11_COMPARISON_ALWAYS;
stencilDesc.StencilEnable			= true;
stencilDesc.StencilReadMask			= 0xFF;
stencilDesc.StencilWriteMask			= 0xFF;

svd.Flags		= 0;
svd.Format		= DXGI_FORMAT_D32_FLOAT_S8X24_UINT;
svd.Texture2D.MipSlice	= 0;
svd.ViewDimension	= D3D11_DSV_DIMENSION_TEXTURE2D;


They're all created in the correct order by the device, and throw no errors. I've also set the depth stencil view together with the render target view in the OMSetRenderTargets function, and I do the ClearDepthStencilView together with the ClearRenderTargetView, but to no avail. Just a blank screen.


If you'd like to peek at more of the code, it's all on https://github.com/Wedvich/Untopia (since it's an ongoing project, there are some obsolete classes and code in there). The game loop is in the Game class, while the render calls are in the RenderSystem class.


So, does anyone have any ideas as to what I'm doing wrong? Why can't I get the depth to work properly for this?


Sorry for the rambling wall of text, but I'm new to this and I'm not sure how to formulate it into a concise question. Please ask if I need to clear up anything.


I've also attached a Graphics Debugger log (basically PIX for VS2012) with a frame from the failed depth test, where nothing renders. I'm not sure what to make out of it myself, but here it is: Attached File  graphicslog.zip   108.86KB   21 downloads

Getting started with Direct3D

11 June 2012 - 06:49 AM

Hi guys! I've been playing around with making games for a little while now, using SDL at first and then SFML. It's been nice to have the basics done for me, but now I'd like to take another step and learn how to do the graphics from the ground up. So I'm trying to learn the ropes of Direct3D, and have been reading a couple of tutorials on D3D 11 to get started. I'm just trying to get the absolute basics going by drawing a white triangle on a dark background... but I can't get it to work.

I'm using the Visual Studio 2012 RC and the Windows 8 SDK, so there's some C++11 syntax in here, plus there's no D3DX. I've managed to set up the window and the initialization of Direct3D seems to go just fine. It runs the rendering part of the main loop, as it clears the screen in the color I specify. However, my fancy white triangle just won't show up. I've gone through my code several times, and with my lack of experience I can't tell what is wrong with it. I've cut out the window initialization/d3d shutdown and other irrelevant parts, but I'm afraid to cut off too much in case some of it is relevant to my problem, so... big-wall-of-code-warning.

I think I have all the required steps in place; I create the device, device context, swap chain and render target. Then I create a vertex shader+input layout and a pixel shader. After that I create a vertex buffer, add the vertices for my triangle and set the primitive topology to TRIANGLELIST, and that's it for the initialization. In my main loop, I point D3D to my vertex/pixel shaders, and tell it to draw the 3 vertices i inserted into the buffer. But only the dark blue background from the call to ClearRenderTargetView shows up; no triangle. Have I missed any steps, or done anything wrong on the way?

Here is the code I have (I'll shamefully admit to have slacked a bit with the code conventions on this one, so no p before pointer variables etc.):

Main loop:
[source lang="cpp"] while ( msg.message != WM_QUIT ) { if ( PeekMessage( &msg, 0, 0, 0, PM_REMOVE )) { TranslateMessage( &msg ); DispatchMessage( &msg ); } else { g_d3dContext->ClearRenderTargetView( g_renderTarget, clearColor ); g_d3dContext->VSSetShader( g_vertexShader, nullptr, 0 ); g_d3dContext->PSSetShader( g_pixelShader, nullptr, 0 ); g_d3dContext->Draw( 3, 0 ); g_swapChain->Present( 0, 0 ); } }[/source]

D3D init code:
[source lang="cpp"]HRESULT hr = S_OK;RECT rc;GetClientRect( g_hWnd, &rc );float width = static_cast< float >( rc.right - rc.left );float height = static_cast< float >( rc.bottom - rc.top );uint createDeviceFlags = 0;#ifdef _DEBUGcreateDeviceFlags |= D3D11_CREATE_DEVICE_DEBUG;#endifconst uint numDriverTypes = 3;D3D_DRIVER_TYPE driverTypes[ numDriverTypes ] ={ D3D_DRIVER_TYPE_HARDWARE, D3D_DRIVER_TYPE_WARP, D3D_DRIVER_TYPE_REFERENCE};const uint numFeatureLevels = 3;D3D_FEATURE_LEVEL featureLevels[ numFeatureLevels ] ={ D3D_FEATURE_LEVEL_11_0, D3D_FEATURE_LEVEL_10_1, D3D_FEATURE_LEVEL_10_0};DXGI_SWAP_CHAIN_DESC sd = { 0 };sd.BufferCount = 1;sd.BufferDesc.Width = static_cast< uint >( width );sd.BufferDesc.Height = static_cast< uint >( height );sd.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;sd.BufferDesc.RefreshRate.Numerator = 60;sd.BufferDesc.RefreshRate.Denominator = 1;sd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;sd.OutputWindow = g_hWnd;sd.SampleDesc.Count = 1;sd.SampleDesc.Quality = 0;sd.Windowed = true;for( uint driverTypeIndex : driverTypes ){ g_driverType = driverTypes[ driverTypeIndex ]; hr = D3D11CreateDeviceAndSwapChain( nullptr, g_driverType, nullptr, createDeviceFlags, featureLevels, numFeatureLevels, D3D11_SDK_VERSION, &sd, &g_swapChain, &g_d3d, &g_featureLevel, &g_d3dContext ); if( SUCCEEDED( hr )) break;}if( FAILED( hr )) return hr;// Create a render target viewID3D11Texture2D* backBuffer = nullptr;hr = g_swapChain->GetBuffer( 0, __uuidof( ID3D11Texture2D ), reinterpret_cast< void** >( &backBuffer ));if( FAILED( hr )) return hr;hr = g_d3d->CreateRenderTargetView( backBuffer, nullptr, &g_renderTarget );backBuffer->Release();if( FAILED( hr )) return hr;g_d3dContext->OMSetRenderTargets( 1, &g_renderTarget, nullptr );// Setup the viewportD3D11_VIEWPORT vp = { 0 };vp.Width = width;vp.Height = height;vp.MinDepth = 0.0f;vp.MaxDepth = 1.0f;vp.TopLeftX = 0;vp.TopLeftY = 0;g_d3dContext->RSSetViewports( 1, &vp );// Create vertex shader and input layoutID3DBlob* vsBlob = nullptr;ID3DBlob* errorBlob = nullptr;hr = D3DCompileFromFile( L"VertexShader.hlsl", nullptr, nullptr, "main", "vs_4_0", 0, 0, &vsBlob, &errorBlob );if ( FAILED( hr ))return hr;hr = g_d3d->CreateVertexShader( vsBlob->GetBufferPointer(), vsBlob->GetBufferSize(), nullptr, &g_vertexShader );if ( FAILED( hr )){vsBlob->Release();return hr;}D3D11_INPUT_ELEMENT_DESC ied = { 0 };ied.AlignedByteOffset = 0;ied.Format = DXGI_FORMAT_R32G32B32_FLOAT;ied.InputSlotClass = D3D11_INPUT_PER_VERTEX_DATA;ied.InputSlot = 0;ied.InstanceDataStepRate = 0;ied.SemanticIndex = 0;ied.SemanticName = "POSITION";hr = g_d3d->CreateInputLayout( &ied, 1, vsBlob->GetBufferPointer(), vsBlob->GetBufferSize(), &g_inputLayout );vsBlob->Release();if ( FAILED ( hr ))return hr;g_d3dContext->IASetInputLayout( g_inputLayout );// Create pixel shaderID3DBlob* psBlob = nullptr;errorBlob = nullptr;hr = D3DCompileFromFile( L"PixelShader.hlsl", nullptr, nullptr, "main", "ps_4_0", 0, 0, &psBlob, &errorBlob );if ( FAILED( hr ))return hr;hr = g_d3d->CreatePixelShader( psBlob->GetBufferPointer(), psBlob->GetBufferSize(), nullptr, &g_pixelShader );psBlob->Release();if ( FAILED( hr ))return hr;// Put some vertices up in this bitchVector3f vertices[] ={ Vector3f( 0.5f, -0.5f, 0.5f ), Vector3f( 0.5f, -0.5f, 0.5f ), Vector3f( -0.5f, -0.5f, 0.5f )};D3D11_BUFFER_DESC bd = { 0 };bd.BindFlags = D3D11_BIND_VERTEX_BUFFER;bd.ByteWidth = sizeof( Vector3f ) * 3;bd.CPUAccessFlags = 0;bd.MiscFlags = 0;bd.StructureByteStride = 0;bd.Usage = D3D11_USAGE_DEFAULT;D3D11_SUBRESOURCE_DATA initData = { 0 };initData.pSysMem = vertices;initData.SysMemPitch = 0;initData.SysMemSlicePitch = 0;hr = g_d3d->CreateBuffer( &bd, &initData, &g_vertexBuffer );if ( FAILED( hr ))return hr;uint stride = sizeof( Vector3f );uint offset = 0;g_d3dContext->IASetVertexBuffers( 0, 1, &g_vertexBuffer, &stride, &offset );g_d3dContext->IASetPrimitiveTopology( D3D_PRIMITIVE_TOPOLOGY_TRIANGLELIST );return S_OK;[/source]

My vertex struct:
[source lang="cpp"]struct Vector3f{ Vector3f( float ix, float iy, float iz ) : x( ix ), y( iy ), z( iz ) {} float x; float y; float z;};[/source]

My vertex shader:
[source lang="cpp"]float4 main( float4 pos : POSITION ) : SV_POSITION{ return pos;}[/source]

My pixel shader:
[source lang="cpp"]float4 main() : SV_TARGET{ return float4( 1.0f, 1.0f, 1.0f, 1.0f );}[/source]