3D Render

记录最近遇到的问题：

1:崩溃问题
由于高频率获取DC异常导致。
void D3D11Texture2D::Copy2Window(void* srcdc, uint32_t left, uint32_t top, uint32_t dw, uint32_t dh)
{
IDXGISurface1* pSurface1 = NULL;
HRESULT hr = mTex->QueryInterface(__uuidof(IDXGISurface1), (void**)&pSurface1);
if (hr == S_OK)
{
HDC srcDC = NULL;
hr = pSurface1->GetDC(false, &srcDC);
if (hr == S_OK)
{
BitBlt((HDC)srcdc, left, top, dw, dh, srcDC, 0, 0, SRCCOPY);
pSurface1->ReleaseDC(NULL);
}
}
}
目的：将最终的像素图像copy到窗口上，该方式经常崩溃
解决方法：创建一个新的窗口（该窗口为需要显示的窗口的子窗口），使用rtt渲染到新窗口、

m_pForeTex = (IOEye::D3D11Texture2D*)m_pRender->CreateTexture(IOEye::TT_TextureRT,
m_nWidth, m_nHeight,
IOEye::TF_RGBA32, IOEye::TF_SharedResource);
::SendMessage(m_hPreviewWnd, WM_SETPREVIEWTEXTURE, 0, (LPARAM)m_pForeTex->GetSharedHandle());
::SendMessage(::FindWindowEx(NULL,NULL,_T("IOEHdmiWndClass"),_T("IOEHDMI")), WM_SETPREVIEWTEXTURE, 0, (LPARAM)m_pForeTex->GetSharedHandle());

Texture* D3D11RenderDevice::CreateTexture(TextureType tt, int tw, int th, TextureFormat tf, TextureFlag tflag)
{
switch (tt)
{
case TT_Texture1D:
{
return 0;
}
break;
case TT_Texture2D:
{
D3D11Texture2D* texture = new D3D11Texture2D(this);

D3D11_TEXTURE2D_DESC desc = { 0 };
memset(&desc, 0, sizeof(desc));

desc.ArraySize = 1;
desc.BindFlags = D3D11_BIND_SHADER_RESOURCE;
desc.Usage = D3D11_USAGE_DYNAMIC;
desc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
desc.MiscFlags = D3D11_RESOURCE_MISC_SHARED;
desc.MiscFlags = 0;
//desc.Format = DXGI_FORMAT_B8G8R8A8_UNORM;
desc.Width = tw;
desc.Height = th;
desc.MipLevels = 1;
desc.MiscFlags = 0;
desc.SampleDesc.Count = 1;
desc.SampleDesc.Quality = 0;

switch (tf)
{
case TF_RGBA32:
desc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
break;
case TF_BGRA32:
desc.Format = DXGI_FORMAT_B8G8R8A8_UNORM;
break;
default:
desc.Format = DXGI_FORMAT_UNKNOWN;
break;
}

HRESULT hr = mDevice->CreateTexture2D(&desc, NULL, &(texture->mTex));
if (FAILED(hr))
{
LogError(_T("CreateTexture2D failed."), hr);
return NULL;
}

hr = mDevice->CreateShaderResourceView(texture->mTex, 0, &(texture->mTexSv));
if (FAILED(hr))
{
LogError(_T("CreateShaderResourceView failed."), hr);
texture->mTex->Release();
return NULL;
}

texture->mWidth = tw;
texture->mHeight = th;
texture->mSamples = 1;
texture->mFormat = tf;

return texture;
}
case TT_TextureRT:
{
D3D11Texture2D* texture = new D3D11Texture2D(this);

D3D11_TEXTURE2D_DESC desc = { 0 };
memset(&desc, 0, sizeof(desc));

desc.ArraySize = 1;
desc.BindFlags = D3D11_BIND_SHADER_RESOURCE | D3D11_BIND_RENDER_TARGET;
desc.Usage = D3D11_USAGE_DEFAULT;
desc.CPUAccessFlags = 0;
//desc.Format = DXGI_FORMAT_B8G8R8A8_UNORM;
desc.Width = tw;
desc.Height = th;
desc.MipLevels = 1;
desc.MiscFlags = 0;
desc.SampleDesc.Count = 1;
desc.SampleDesc.Quality = 0;

if (tflag & TF_GDIResource)
{
desc.MiscFlags |= D3D11_RESOURCE_MISC_GDI_COMPATIBLE;
}
else if (tflag & TF_SharedResource)
{
desc.MiscFlags |= D3D11_RESOURCE_MISC_SHARED;
}

switch (tf)
{
case TF_RGBA32:
desc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
break;
case TF_BGRA32:
desc.Format = DXGI_FORMAT_B8G8R8A8_UNORM;
break;
default:
desc.Format = DXGI_FORMAT_UNKNOWN;
break;
}

HRESULT hr = mDevice->CreateTexture2D(&desc, NULL, &(texture->mTex));
if (FAILED(hr))
{
LogError(_T("CreateTexture2D failed."), hr);
return NULL;
}

IDXGIResource* pDXGIResource = 0;
hr = texture->mTex->QueryInterface(__uuidof(IDXGIResource), (void **)&pDXGIResource);
if (FAILED(hr))
{
LogError(_T("CreateSharedHandle failed."), hr);
}
pDXGIResource->GetSharedHandle(&texture->mSharedHandle);
pDXGIResource->Release();

hr = mDevice->CreateShaderResourceView(texture->mTex, 0, &(texture->mTexSv));
if (FAILED(hr))
{
LogError(_T("CreateShaderResourceView failed."), hr);
texture->mTex->Release();
return NULL;
}

hr = mDevice->CreateRenderTargetView(texture->mTex, NULL, &texture->mTexRtv);
if (FAILED(hr))
{
LogError(_T("CreateRenderTargetView failed."), hr);
texture->mTex->Release();
return NULL;
}

texture->mWidth = tw;
texture->mHeight = th;
texture->mSamples = 1;
texture->mFormat = tf;

return texture;
}
default:
return NULL;
}
}

在其他的窗口获取该共享纹理，然后进行渲染；
m_hPreviewTextureHandle = (HANDLE)lParam;
m_pPreviewTexture = (IOEye::D3D11Texture2D*)m_pPreviewRender->CreateTexture(IOEye::TT_Texture2D, m_hPreviewTextureHandle);
m_pPreviewQuad->SetSubMeshTexture(0, m_pPreviewTexture);

2:增加HDMI输出(使用SDL方案发现map纹理过慢，4K画质需要200ms，导致卡顿，更改为开启一个新的进程使用共享纹理方案)

3:小纹理可拖动大小位置方案更改为直接使用大纹理（导致加载过慢，显存消耗过度)->进行资源释放，以减小资源的利用(任然效果不佳)->使用freeImage进行纹理裁剪，建立大量定点和索引，由于频繁创建顶点和纹理是的CPU频繁和GPU进行交互，导致创建顶点索引和纹理异常，更改为
（1）：使用配置文件进行顶点计算出各个顶点坐标
（2）：根据顶点进行纹理的裁剪，裁剪为小纹理
（3）：根据顶点坐标一次性创建一个序列帧的所有顶点和索引
（4）：然后更具图片的路径创建出静态纹理（将所有的操作提交给GPU，减少异常发生的可能）

由于创建顶点缓存等等是通过PCI_Express总线，速度相对于CPU访问缓存和GPU访问缓存非常慢，所以进行CPU GPU交互的时候非常容易异常
4:时间线逻辑的更改（设计变更)