in geometry shader, i written a little code that just append vertices to stream following this guide:
text
so, as it's obvious, i added code stream.RestartStrip() after stream.Append(gs_stream).
but I had a problem with nothing being rendered. after i changed the code(:stream.RestartStrip()) to annotation, it was rendered properly again.
what this funtion meanning actually and what works in pipeline?
[maxvertexcount(12)]
void GS(triangle GS_IN input[3], inout TriangleStream<GS_IN> stream)
{
GS_IN gs_stream = (GS_IN)0;
for (int i = 0; i < 3; ++i)
{
gs_stream.p = input[i].p;
gs_stream.n = input[i].n;
gs_stream.c = float4(1, 1, 1, 1); //input[i].c;
gs_stream.t = input[i].t;
//if (input[i].strength > 0)
//{
// gs_stream.p.y += input[i].strength * altitude.x;
// gs_stream.c *= input[i].circle;
//}
stream.Append(gs_stream);
//stream.RestartStrip();
}
}
Related
I'm building the dialog-based MFC application.
When I click the Button then I can choose the image from the file explorer and that image is also loaded into cv::imread(). And also shows in the Picture Control.
I can load and show an image in the Picture Control with the following code.
void CMFCApplication3Dlg::OnBnClickedButton1()
{
cv::Mat src = cv::imread("D:/source/repos/Testing_Photos/Large/cavalls.png");
Display(src);
}
But not with the following code.
void CMFCApplication3Dlg::OnBnClickedButton1()
{
TCHAR szFilter[] = _T("PNG (*.png)|*.png|JPEG (*.jpg)|*.jpg|Bitmap (*.bmp)|*.bmp||");
CFileDialog dlg(TRUE, NULL, NULL, OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT, szFilter, AfxGetMainWnd());
if (dlg.DoModal() == IDC_BUTTON1)
{
CString cstrImgPath = dlg.GetPathName();
CT2CA pszConvertedAnsiString(cstrImgPath);
std::string strStd(pszConvertedAnsiString);
cv::Mat src = cv::imread(strStd);
Display(src);
}
}
And the following is the "Display" function.
void CMFCApplication3Dlg::Display(cv::Mat& mat) {
CStatic * PictureB = (CStatic *)GetDlgItem(IDC_STATIC);
CWnd* cwn = (CWnd *)GetDlgItem(IDC_STATIC);
CDC* wcdc = cwn->GetDC();
HDC whdc = wcdc->GetSafeHdc();
RECT rec;
cwn->GetClientRect(&rec);
cv::Size matSize;
matSize = cv::Size(rec.right, rec.bottom);
BITMAPINFO bitmapinfo;
bitmapinfo.bmiHeader.biBitCount = 24;
bitmapinfo.bmiHeader.biWidth = mat.cols;
bitmapinfo.bmiHeader.biHeight = -mat.rows;
bitmapinfo.bmiHeader.biPlanes = 1;
bitmapinfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bitmapinfo.bmiHeader.biCompression = BI_RGB;
bitmapinfo.bmiHeader.biClrImportant = 0;
bitmapinfo.bmiHeader.biClrUsed = 0;
bitmapinfo.bmiHeader.biSizeImage = 0;
bitmapinfo.bmiHeader.biXPelsPerMeter = 0;
bitmapinfo.bmiHeader.biYPelsPerMeter = 0;
StretchDIBits(
whdc,
0, 0,
matSize.width, matSize.height,
0, 0,
mat.cols, mat.rows,
mat.data,
&bitmapinfo,
DIB_RGB_COLORS,
SRCCOPY
);
}
I am very new to MFC and I really don't have any idea where I'm wrong.
Please help me!
Thank you.
This is not the correct method to paint. The picture will be erased every time there is a paint request.
That's what happens with CFileDialog which forces another repaint immediately after you paint the image. You have to respond to OnPaint or OnDrawItem, or use CStatic::SetBitmap as noted in comment.
You can do this with CImage class, there is no need for OpenCV:
CImage img;
if(S_OK == img.Load(L"unicode.jpg"))
{
CStatic *control = (CStatic*)GetDlgItem(IDC_STATIC);
control->ModifyStyle(0, SS_BITMAP);
auto oldbmp = control->SetBitmap(img.Detach());
if(oldbmp)
DeleteObject(oldbmp);
}
Or you can use OpenCV to create HBITMAP handle.
Note that OpenCV does not handle Unicode filenames. CW2A converts Unicode to ANSI character encoding. This fails if one or more code points cannot be represented in the currently active code page. To work around it, we can open the file with CFile or std::ifstream, read it as binary, then open with cv::imdecode instead. Example:
//open the file from unicode path:
const wchar_t *filename = L"unicode.jpg";
std::ifstream fin(filename, std::ios::binary);
if(!fin.good())
return;
//read from memory
std::vector<char> vec(std::istreambuf_iterator<char>(fin), {});
cv::Mat src = cv::imdecode(vec, cv::IMREAD_COLOR);
if(!src.data)
return;
//create hbitmap
BITMAPINFOHEADER bi = { sizeof(bi), src.cols, -src.rows, 1, 24 };
CClientDC dc(this);
auto hbmp = CreateDIBitmap(dc, &bi, CBM_INIT, src.data, (BITMAPINFO*)&bi, 0);
//send hbitmap to control
auto control = (CStatic*)GetDlgItem(IDC_STATIC);
auto oldbmp = control->SetBitmap(hbmp);
if (oldbmp)
DeleteObject(oldbmp);
I am trying to run a compute shader and get the resulting texture using SharpDX.
From what I understood, I need to:
1. Create a texture to set as an output to the shader.
2. Set the above texture as an unordered access view so I can write to it.
3. Run the shader
4. Copy the UAV texture to a staging texture so it can be accessed by the CPU
5. Read the staging texture to a Bitmap
The problem is that whatever I do, the result is a black bitmap. I don't think the bug is in the Texture2D -> Bitmap conversion code as printing the first pixel directly from the staging texture also gives me 0.
This is my shader code:
RWTexture2D<float4> Output : register(u0);
[numthreads(32, 32, 1)]
void main(uint3 id : SV_DispatchThreadID) {
Output[id.xy] = float4(0, 1.0, 0, 1.0);
}
Using the MS DX11 docs and blogs, I pieced together this code to run the texture:
public class GPUScreenColor {
private int adapterIndex = 0;
private Adapter1 gpu;
private Device device;
private ComputeShader computeShader;
private Texture2D texture;
private Texture2D stagingTexture;
private UnorderedAccessView view;
public GPUScreenColor() {
initializeDirectX();
}
private void initializeDirectX() {
using (var factory = new Factory1()) {
gpu = factory.GetAdapter1(adapterIndex);
}
device = new Device(gpu, DeviceCreationFlags.Debug, FeatureLevel.Level_11_1);
var compilationResult = ShaderBytecode.CompileFromFile("test.hlsl", "main", "cs_5_0", ShaderFlags.Debug);
computeShader = new ComputeShader(device, compilationResult.Bytecode);
texture = new Texture2D(device, new Texture2DDescription() {
BindFlags = BindFlags.UnorderedAccess | BindFlags.ShaderResource,
Format = Format.R8G8B8A8_UNorm,
Width = 1024,
Height = 1024,
OptionFlags = ResourceOptionFlags.None,
MipLevels = 1,
ArraySize = 1,
SampleDescription = { Count = 1, Quality = 0 }
});
UnorderedAccessView view = new UnorderedAccessView(device, texture, new UnorderedAccessViewDescription() {
Format = Format.R8G8B8A8_UNorm,
Dimension = UnorderedAccessViewDimension.Texture2D,
Texture2D = { MipSlice = 0 }
});
stagingTexture = new Texture2D(device, new Texture2DDescription {
CpuAccessFlags = CpuAccessFlags.Read,
BindFlags = BindFlags.None,
Format = Format.R8G8B8A8_UNorm,
Width = 1024,
Height = 1024,
OptionFlags = ResourceOptionFlags.None,
MipLevels = 1,
ArraySize = 1,
SampleDescription = { Count = 1, Quality = 0 },
Usage = ResourceUsage.Staging
});
}
public Bitmap getBitmap() {
device.ImmediateContext.ComputeShader.Set(computeShader);
device.ImmediateContext.ComputeShader.SetUnorderedAccessView(0, view);
device.ImmediateContext.Dispatch(32, 32, 1);
device.ImmediateContext.CopyResource(texture, stagingTexture);
var mapSource = device.ImmediateContext.MapSubresource(stagingTexture, 0, MapMode.Read, MapFlags.None);
Console.WriteLine(Marshal.ReadInt32(IntPtr.Add(mapSource.DataPointer, 0)));
try {
// Copy pixels from screen capture Texture to GDI bitmap
Bitmap bitmap = new Bitmap(1024, 1024, System.Drawing.Imaging.PixelFormat.Format32bppRgb);
BitmapData mapDest = bitmap.LockBits(new Rectangle(0, 0, 1024, 1024), ImageLockMode.ReadWrite, bitmap.PixelFormat);
try {
var sourcePtr = mapSource.DataPointer;
var destPtr = mapDest.Scan0;
for (int y = 0; y < 1024; y++) {
// Copy a single line
Utilities.CopyMemory(destPtr, sourcePtr, 1024 * 4);
// Advance pointers
sourcePtr = IntPtr.Add(sourcePtr, mapSource.RowPitch);
destPtr = IntPtr.Add(destPtr, mapDest.Stride);
}
return bitmap;
} finally {
bitmap.UnlockBits(mapDest);
}
} finally {
device.ImmediateContext.UnmapSubresource(stagingTexture, 0);
}
}
}
I am pretty new to shaders so it may be something obvious...
First thing, you create your UAV as a local :
UnorderedAccessView view = new UnorderedAccessView(....
So the field is then null, replacing by
view = new UnorderedAccessView(....
will solve the first issue.
Second, it's quite likely that the runtime will complain about types (debug will give you something like :
The resource return type for component 0 declared in the shader code (FLOAT) is not compatible with the resource type bound to Unordered Access View slot 0 of the Compute Shader unit (UNORM).
Some cards might do something (fix it silently), some might do nothing, some might crash :)
Problem is that RWTexture2D does not match UNORM format (as you specify flating point format here).
You need to enforce your RWTexture to be specifically of unorm format eg (yes runtime can be that picky):
RWTexture2D<unorm float4> Output : register(u0);
Then your whole setup should work (PS: I did not check the bitmap code, but I doubled checked that the shader is running without error and first pixel is matching)
I am using the following code to print what is inside the clipboard (bitmap).
On the printed paper, I see the black line drawn with MoveTo/LineTo however the bitmap is not drawn.
Using the same drawing code in a CView works perfectly fine.
keybd_event(VK_SNAPSHOT, 1, 0, NULL);
HBITMAP handle = NULL;
if (::OpenClipboard(NULL))
{
handle = (HBITMAP)GetClipboardData(CF_BITMAP);
if (handle)
{
CBitmap* pBmp = CBitmap::FromHandle(handle);
BITMAP bm;
pBmp->GetBitmap(&bm);
int iBmpWidth = bm.bmWidth;
int iBmpHeight = bm.bmHeight;
CPrintDialog* pDlg = new CPrintDialog(FALSE);
CString csText;
CString cTitle;
if (pDlg->GetDefaults() == FALSE)
{
delete pDlg;
return;
}
pDlg->m_pd.Flags &= ~PD_RETURNDEFAULT;
LPDEVMODE pDevMode = pDlg->GetDevMode();
::GlobalUnlock(pDlg->m_pd.hDevMode);
DOCINFO di;
di.cbSize = sizeof(DOCINFO);
pDlg->m_pd.hwndOwner = this->GetSafeHwnd();
if (pDlg->DoModal() == IDOK)
{
HDC hdcPrinter = pDlg->GetPrinterDC();
if (hdcPrinter != NULL)
{
pDevMode = (LPDEVMODE)GlobalLock(pDlg->m_pd.hDevMode);
pDevMode->dmPaperSize = DMPAPER_A4;
pDevMode->dmOrientation = DMORIENT_LANDSCAPE;
ResetDCW(hdcPrinter, pDevMode);
GlobalUnlock(pDlg->m_pd.hDevMode);
// create a CDC and attach it to the default printer
CDC dcPrinter;
dcPrinter.Attach(hdcPrinter);
// call StartDoc() to begin printing
DOCINFO docinfo;
memset(&docinfo, 0, sizeof(docinfo));
docinfo.cbSize = sizeof(docinfo);
docinfo.lpszDocName = _T("CDC::StartDoc() Code Fragment");
// if it fails, complain and exit gracefully
if (dcPrinter.StartDoc(&docinfo) < 0)
{
MessageBox(_T("Printer wouldn't initalize"));
}
else
{
// start a page
if (dcPrinter.StartPage() < 0)
{
MessageBox(_T("Could not start page"));
dcPrinter.AbortDoc();
}
else
{
int PaperWidth = dcPrinter.GetDeviceCaps(HORZRES);
int PaperHeight = dcPrinter.GetDeviceCaps(VERTRES);
CDC memDC;
memDC.CreateCompatibleDC(&dcPrinter);
CBitmap* pOldBit = memDC.SelectObject(pBmp);
dcPrinter.MoveTo(1000, 1000);
dcPrinter.LineTo(PaperWidth - 1000, PaperHeight - 1000);
dcPrinter.StretchBlt(100,
100,
PaperWidth - 100,
PaperHeight - 100,
&memDC,
0,
0,
iBmpWidth,
iBmpHeight,
SRCCOPY);
memDC.SelectObject(pOldBit);
memDC.DeleteDC();
dcPrinter.EndPage();
dcPrinter.EndDoc();
}
}
}
}
delete pDlg;
}
::EmptyClipboard();
::CloseClipboard();
}
Using your code without any changes works for me, I tested using a real printer and CutePDF, both printed the bitmap. It might be an issue with your source DC when you create memDC, either it does not support the correct color space or does not support raster operations. Try the following code instead:
CDC* pDC = GetDesktopWindow()->GetDC();
memDC.CreateCompatibleDC(pDC);
GetDesktopWindow()->ReleaseDC(pDC);
I'm trying to load simple 3d model cube.3ds, but next error occurs: when I read indices to my vector, vector contains: [0, 1, 2, 3, ...]. It's not properly. I found almost the same topic: Assimp and D3D model loading: Mesh not being displayed in D3D, but I don't found the answer. Can anyone describe in detail properly algorithm for loading indices from meshes. Thank's a lot!
Here is a example pulled from the assimp sample code on accessing the mesh indices.
for (; n < nd->mNumMeshes; ++n)
{
const struct aiMesh* mesh = scene->mMeshes[nd->mMeshes[n]];
apply_material(sc->mMaterials[mesh->mMaterialIndex]);
if(mesh->mNormals == NULL) {
glDisable(GL_LIGHTING);
} else {
glEnable(GL_LIGHTING);
}
for (t = 0; t < mesh->mNumFaces; ++t) {
const struct aiFace* face = &mesh->mFaces[t];
GLenum face_mode;
switch(face->mNumIndices) {
case 1: face_mode = GL_POINTS; break;
case 2: face_mode = GL_LINES; break;
case 3: face_mode = GL_TRIANGLES; break;
default: face_mode = GL_POLYGON; break;
}
glBegin(face_mode);
for(i = 0; i < face->mNumIndices; i++) {
int index = face->mIndices[i];
if(mesh->mColors[0] != NULL)
glColor4fv((GLfloat*)&mesh->mColors[0][index]);
if(mesh->mNormals != NULL)
glNormal3fv(&mesh->mNormals[index].x);
glVertex3fv(&mesh->mVertices[index].x);
}
glEnd();
}
}
I am trying to capture video from webcam using Opencv and transmit it over TCP. In addition, I wanted to encrypt the video using AES. But whenever run the AES decrpt function the video is unstable.
I am using the opencv over tcp example and AES example
Whenever I run this function:
img->imageData = aes_decrypt(&de, img->imageData, &imgsize);
my video gets unstable.
I have attached the code segment where I wrote the function.
/* start receiving images*/
while(1)
{
/* get raw data */
for (i = 0; i < imgsize; i += bytes) {
if ((bytes = recv(sock, sockdata + i, imgsize - i, 0)) == -1) {
quit("recv failed", 1);
}
}
pthread_mutex_lock(&mutex);
for (i = 0, k = 0; i < img->height; i++) {
for (j = 0; j < img->width; j++) {
((uchar*)(img->imageData + i * img->widthStep))[j] = sockdata[k++];
}
}
img->imageData = aes_decrypt(&de, img->imageData, &imgsize);
is_data_ready = 1;
pthread_mutex_unlock(&mutex);
/* have we terminated yet? */
pthread_testcancel();
/* no, take a rest for a while */
usleep(1000);
}
This is my first post, sorry for my bad English and format of the post.