Drawing Primitives with DXUT

Graphics and GPU Programming Programming

Started by foursticksj August 29, 2010 12:34 AM

12 comments, last by Fanschop 10 years, 3 months ago

100

Author

August 29, 2010 12:34 AM

Has anyone had any problems drawing primitives using the DXUT framework?
I have two programs that do exactly the same thing, drawing a triangle to the screen. One uses DXUT and the other does not. The program that does not use DXUT renders the triangle fine, while using DXUT nothing gets drawn.

Not using DXUT:
------------------------------------------------------------------------------

void render(){    d3ddev->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 0, 0), 1.0f, 0);    d3ddev->BeginScene();    // create the vertices using the CUSTOMVERTEX struct    CUSTOMVERTEX vertices[] =    {        { 400.0f, 62.5f, 0.5f, 1.0f, D3DCOLOR_XRGB(0, 0, 255), },        { 650.0f, 500.0f, 0.5f, 1.0f, D3DCOLOR_XRGB(0, 255, 0), },        { 150.0f, 500.0f, 0.5f, 1.0f, D3DCOLOR_XRGB(255, 0, 0), },    };	LPDIRECT3DVERTEXBUFFER9 v_buffer = NULL;     d3ddev->CreateVertexBuffer(3*sizeof(CUSTOMVERTEX),                               0,                               CUSTOMFVF,                               D3DPOOL_MANAGED,                               &v_buffer,                               NULL);    VOID* pVoid;       v_buffer->Lock(0, 0, (void**)&pVoid, 0);    memcpy(pVoid, vertices, sizeof(vertices));    v_buffer->Unlock();    d3ddev->SetFVF(CUSTOMFVF);	d3ddev->SetStreamSource(0, v_buffer, 0, sizeof(CUSTOMVERTEX));    d3ddev->DrawPrimitive(D3DPT_TRIANGLELIST, 0, 1);    d3ddev->EndScene();    d3ddev->Present(NULL, NULL, NULL, NULL);}

------------------------------------------------------------------------------

Using DXUT
------------------------------------------------------------------------------

void GameApp::vOnFrameRender (void) // render callback{   DXUTGetD3D9Device ()->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 0, 0), 1.0f, 0);    DXUTGetD3D9Device ()->BeginScene ();    CUSTOMVERTEX vertices[] =    {        { 400.0f, 62.5f, 0.5f, 1.0f, D3DCOLOR_XRGB(0, 0, 255), },        { 650.0f, 500.0f, 0.5f, 1.0f, D3DCOLOR_XRGB(0, 255, 0), },        { 150.0f, 500.0f, 0.5f, 1.0f, D3DCOLOR_XRGB(255, 0, 0), },    };	LPDIRECT3DVERTEXBUFFER9 v_buffer = NULL;    DXUTGetD3D9Device ()->CreateVertexBuffer(3*sizeof(CUSTOMVERTEX),                               0,                               CUSTOMFVF,                               D3DPOOL_MANAGED,                               &v_buffer,                               NULL);    VOID* pVoid;       v_buffer->Lock(0, 0, (void**)&pVoid, 0);    memcpy(pVoid, vertices, sizeof(vertices));    v_buffer->Unlock();   DXUTGetD3D9Device ()->SetFVF(CUSTOMFVF);	DXUTGetD3D9Device ()->SetStreamSource(0, v_buffer, 0,   sizeof(CUSTOMVERTEX));    DXUTGetD3D9Device ()->DrawPrimitive(D3DPT_TRIANGLELIST, 0, 1);	g_HUD.OnRender( m_timer.getDelta ());    DXUTGetD3D9Device ()->EndScene();}

------------------------------------------------------------------------------

I know the verticies should be declared in a initialization function, Im just simplifying the code for now. Help with this would be greatly appreciated.

Anddos

588

August 29, 2010 04:10 AM

if it a screenspace triangle , did you specify RHW?

Buckeye

10,754

August 29, 2010 05:51 AM

As the two routines you posted look all but identical, it's unlikely the problem is related to that code.

There's a big problem with both routines, by the way. You create a buffer and never release it.

Do some trouble-shooting. Does the frame render function get called?

Then start comparing other things that could affect the rendering - world, viewport, view, projection, etc.

Please don't PM me with questions. Post them in the forums for everyone's benefit, and I can embarrass myself publicly.

You don't forget how to play when you grow old; you grow old when you forget how to play.

foursticksj

100

Author

August 29, 2010 02:06 PM

I know that each function gets called every frame.

I can also draw sprites and lines (LPD3DXLINE) with no problems using DXUT.

As for cleaning up the code and releasing pointers, I was going to do this after I got everything working.

What other type of trouble-shooting should I try?
I have not messed with the world, view and projection matrices.
Does DXUT initialize the camera or screen somehow that I would not see the triangle?

Buckeye

10,754

August 29, 2010 04:28 PM

Quote:Does DXUT initialize the camera or screen somehow that I would not see the triangle?

It certainly can. If the triangle isn't within the view (camera position and direction), it won't be rendered.

Make sure you have the same settings for view and projection, including near-z and far-z settings, in your DXUT app as you do in your app that renders correctly. That may or may not be the problem, but it's a place to start.

EDIT: Actually, that's extremely likely since you've positioned your triangle a large distance away from the origin.

Quote:releasing pointers, I was going to do this after I got everything working.

Bad, bad practice. You're trying to debug code that you know has errors in it.

Please don't PM me with questions. Post them in the forums for everyone's benefit, and I can embarrass myself publicly.

You don't forget how to play when you grow old; you grow old when you forget how to play.

foursticksj

100

Author

August 29, 2010 08:58 PM

I don't think that is the problem. I set up the view and projection matrices and get the same result. I think I did it right, but here is the new code:

void GameApp::vOnFrameRender (void) // render callback{   DXUTGetD3D9Device ()->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 0, 0), 1.0f, 0);    DXUTGetD3D9Device ()->BeginScene ();    CUSTOMVERTEX vertices[] =    {        { 400.0f, 62.5f, 0.5f, 1.0f, D3DCOLOR_XRGB(0, 0, 255), },        { 650.0f, 500.0f, 0.5f, 1.0f, D3DCOLOR_XRGB(0, 255, 0), },        { 150.0f, 500.0f, 0.5f, 1.0f, D3DCOLOR_XRGB(255, 0, 0), },    };	LPDIRECT3DVERTEXBUFFER9 v_buffer = NULL;    DXUTGetD3D9Device ()->CreateVertexBuffer(3*sizeof(CUSTOMVERTEX),                               0,                               CUSTOMFVF,                               D3DPOOL_MANAGED,                               &v_buffer,                               NULL);    VOID* pVoid;       v_buffer->Lock(0, 0, (void**)&pVoid, 0);    memcpy(pVoid, vertices, sizeof(vertices));    v_buffer->Unlock();   DXUTGetD3D9Device ()->SetFVF(CUSTOMFVF);    D3DXMATRIX matView;       D3DXMatrixLookAtLH(&matView,                       &D3DXVECTOR3 (0.0f, 0.0f, 10.0f),                          &D3DXVECTOR3 (0.0f, 0.0f, 0.0f),                          &D3DXVECTOR3 (0.0f, 1.0f, 0.0f));       DXUTGetD3D9Device ()->SetTransform(D3DTS_VIEW, &matView);       D3DXMATRIX matProjection;        D3DXMatrixPerspectiveFovLH(&matProjection,                               0,                                 (FLOAT) 800 / (FLOAT)600,                                1.0f,                                  100.0f);        DXUTGetD3D9Device ()->SetTransform(D3DTS_PROJECTION, &matProjection);   	DXUTGetD3D9Device ()->SetStreamSource(0, v_buffer, 0, sizeof(CUSTOMVERTEX));    DXUTGetD3D9Device ()->DrawPrimitive(D3DPT_TRIANGLELIST, 0, 1);	DXUTGetD3D9Device ()->SetStreamSource(0, v_buffer, 0,   sizeof(CUSTOMVERTEX));    DXUTGetD3D9Device ()->DrawPrimitive(D3DPT_TRIANGLELIST, 0, 1);	g_HUD.OnRender( m_timer.getDelta ());    DXUTGetD3D9Device ()->EndScene();// Release the vertex Buffer!!	SAFE_RELEASE (v_buffer);}

What should I try next?

scope

108

August 29, 2010 09:09 PM

do you call Present(NULL, NULL, NULL, NULL); after EndScene(); ?

foursticksj

100

Author

August 29, 2010 09:15 PM

DXUT does this automatically in its Render function after it calls the Callback function, which in this case is GameApp::vOnFrameRender().

scope

108

August 29, 2010 09:19 PM

oh alright, that was my only idea :)

Buckeye

10,754

August 29, 2010 09:51 PM

D3DXMatrixLookAtLH(&matView,                       &D3DXVECTOR3 (0.0f, 0.0f, 10.0f),                          &D3DXVECTOR3 (0.0f, 0.0f, 0.0f),                          &D3DXVECTOR3 (0.0f, 1.0f, 0.0f));

Your camera is at (0,0,10), looking at the origin (0,0,0) - and the triangle is between x=150 and x=600, way up along the y-axis. The triangle is off to the camera's left side. You won't see it.

Either move the camera closer to the center of the triangle (and back along the z-axis), or move the triangle back to the origin.

Also, the triangle is really big. For starters, just create a much smaller triangle at the origin. Something like

(1,0,0)
(0,1,0)
(-1,0,0)

Once you've got it where you can see it, then you can make changes.

EDIT: I realize that releasing the buffer wasn't the problem. The principle is that you're asking people to find problems with your code that you're being sloppy with. If you're "doing things later," there's no telling what else you may have left out but intended to "do later."

Please don't PM me with questions. Post them in the forums for everyone's benefit, and I can embarrass myself publicly.

You don't forget how to play when you grow old; you grow old when you forget how to play.

Drawing Primitives with DXUT

This topic is closed to new replies.

Popular Topics

Recommended Tutorials

Drawing Primitives with DXUT

This topic is closed to new replies.

Popular Topics

Recommended Tutorials

Reticulating splines