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我一直在玩游戏制作一段时间,首先使用 SDL,然后使用 SFML。为我完成了基础工作真是太好了,但现在我想再迈出一步,学习如何从头开始制作图形。因此,我正在尝试学习 Direct3D 的基本原理,并且已经阅读了一些关于 D3D 11 的教程以开始使用。我只是想通过在深色背景上绘制一个白色三角形来获得绝对的基础知识......但我无法让它工作。

我使用的是 Visual Studio 2012 RC 和 Windows 8 SDK,所以这里有一些 C++11 语法,而且没有 D3DX。我已经成功地设置了窗口并且 Direct3D 的初始化似乎进行得很好。它运行主循环的渲染部分,因为它以我指定的颜色清除屏幕。但是,我的花哨的白色三角形不会出现。我已经多次检查了我的代码,由于缺乏经验,我无法判断它有什么问题。我已经剪掉了窗口初始化/d3d 关闭和其他不相关的部分,但我害怕剪掉太多,以防其中一些与我的问题有关,所以...... big-wall-of-code-warning .

我认为我已经完成了所有必需的步骤;我创建设备、设备上下文、交换链和渲染目标。然后我创建一个顶点着色器+输入布局和一个像素着色器。之后我创建一个顶点缓冲区,为我的三角形添加顶点并将原始拓扑设置为 TRIANGLELIST,这就是初始化。在我的主循环中,我将 D3D 指向我的顶点/像素着色器,并告诉它绘制我插入缓冲区的 3 个顶点。但是只显示调用 ClearRenderTargetView 的深蓝色背景;没有三角形。我是否错过了任何步骤,或者在途中做错了什么?

这是我拥有的代码(我承认在这个代码约定上有点松懈,所以在指针变量之前没有 p 等):

主循环:

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 );
    }
}

Direct3D 初始化:

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;

const 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 view
ID3D11Texture2D* 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 viewport
D3D11_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 layout
ID3DBlob* 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 shader
ID3DBlob* 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 bitch
Vector3f 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;

我的顶点类型:

struct Vector3f
{
    Vector3f( float ix, float iy, float iz )
        : x( ix ), y( iy ), z( iz ) {}

    float x;
    float y;
    float z;
};

我的顶点着色器:

float4 main( float4 pos : POSITION ) : SV_POSITION
{
    return pos;
}

我的像素着色器:

float4 main() : SV_TARGET
{
    return float4( 1.0f, 1.0f, 1.0f, 1.0f );
}
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1 回答 1

2

当然,这是一个非常愚蠢的疏忽。我只是输入了错误的顶点数据——所有的顶点都在同一个 Y 维度上;前两个甚至是相同的。

改为:

Vector3f( -0.5f, 0.5f, 0.5f ),
Vector3f( 0.5f, 0.5f, 0.5f ),
Vector3f( -0.5f, -0.5f, 0.5f )

还有很多歌舞和幸福。

于 2012-06-11T18:08:56.783 回答