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Your First Link is not working .... But thanks for the Reply
I want to ask one more thing that i am using this code ... where height is the Font height and startPoint_x and startPoint_y is the point where text is to be display
CsGL.OpenGL.GDITextureFont myGDITextureFont;
Font newFont;
newFont = new System.Drawing.Font("Microsoft Sans Serif", (float)height);
myGDITextureFont = new GDITextureFont(newFont, 'a', 'z');
GL.glTranslatef((float)startPoint_x, (float)startPoint_y, 0);
myGDITextureFont.DrawString(text);
and in this way text displayed but when i click on it it turns into solid bar .... What is the problem with this code ....
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Hi,
I need to render bitmaps really fast with great performance.
Since I at the same time need to do other CPU demanding operations it is prefered if the rendering can be handled as much as possible by the graphics card. But the rendering must perform ok even if there is no 3D support in the graphics card.
I have tried several rendering methods without coming to a conclusion.
I have tried these methods:
MFC:
----------------------------
CDC::StretchDIBits
CDC::StretchBlt
CDC::BitBlt
GDI:
----------------------------
SetDIBitsToDevice
DirectDraw:
----------------------------
IDirectDrawSurface7::BltFast
DirectX 9
----------------------------
IDirect3DDevice9::SetTexture
IDirect3DDevice9::StretchRect
ID3DXSprite::Draw
One method is by far fastest on all three systems I have tested with.
The system setup is similar for all three, except for the graphics cards:
Windows XP. service pack 2
Intel Pentium D CPU 3.40 GHz, 2GB Ram
The graphic cards differ accordingly:
1. Matrox Millenium G550. 32MB
2. Intel 82915. 128MB
3. Geforce8600GT 256Mb
The by far fastest rendering method is "IDirectDrawSurface7::BltFast".
It is also the only method which is slowest on system 1 with the worst graphics card, and by far fastest on system 3 with the best card.
Many of the other methods are worst on system 3, with the best graphics card!
However, I'am not very happy with using an old method from DDraw7, when there should be methods which are faster and more optimized for new graphic cards in DirectX 9. Furthermore BltFast does not support resizing.
But which method is this, that is best optimized for new graphics cards but also has good performance on computers with old graphics cards? And how do I use it to get the best performance and to minimize CPU usage, while letting the GPU do the work when supported by the graphics card?
What my application does is:
Retrieving several video streams on the network in MJPEG and MPEG4 format. Decoding the video to device independent bitmaps and finally rendering the bitmaps to screen in either original size, upscaled or downscaled. (An optional solution is to handle the resizing manually).
So the method has to be good at resizing the image, and I don't think I need any time consuming dubbel buffering, since I always draw the pictures in the same size at the same place once started.
Thanks for all help!
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I have an algorithm which generates random 2D terrain shapes which are similar to those seen in the "Worms" game landscapes.
With such random shapes, how do I apply a texture to such random "curvy" shapes?
The GDI+ texture examples I've seen apply to regular shapes like rectangles but didnt cover how to apply textures to irregular shapes.
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Floodfill[^] with a pattern brush?
But who is the king of all of these folks?
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hi guys,
i want to start my career in web development.
kindly send me your suggestions about Design according to MICROSOFT STANDARDS.
My task is basically screen designing if u can share web templates.
i hope i will get soon suggestion from your side.
u can send your suggestion here or me4uonly@live.co.uk
thanks
bye
__________________________________________________
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And why would we do this? We'd be complicit in helping you defraud your employer because you can't do the job and yet you're getting paid to do it. Tell you what - you can pay MY company to do this for you.
Or do you think your employer will be very pleased that you've just advertised a site that needs redesigning and admitted that your company isn't up to the task. How about if we got in touch with whites-stationery and let them know? Do you think they'd be pleased?
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Dear Pete,
Thank you very much for your remarks, well if it is against the law to show any company name here then i will delete this question from here. i gave this name here as an example. i am not going to work on this site.
Actually i need free ASP.NET templates because i am a student and i want to work on stationary web site.
if u can help me then just reply me.
i hope you will help me in this regard.
take care
good bye
__________________________________________________
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Saqib Yaqub wrote: Actually i need free ASP.NET templates because i am a student and i want to work on stationary web site.
if u can help me then just reply me.
i hope you will help me in this regard.
Ah, so in other words your homework assignement is to design a website for a stationary store and you want us to do your homework for you?
Doing my part to piss off the religious right.
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Why not just google for free website templates? There are hundreds of sites that supply them.
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In the *graphics* forum ?
You seem very confused to me.
Christian Graus - Microsoft MVP - C++
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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Christian Graus wrote: You seem very confused to me.
He can't decide whether he's employed or doing this as a project.
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Hi,
I'm new to openGL programming. I'm trying to simulate motion and zooming in and out in an SimpleOpenGLControl from the Tao Framework. <so you="ll need to install the framework and put in a reference in Visual Studio to " tao=" in order to test my code">
I've just begun trying to move an object up and down, but i can't seem to get the object to move. i know i'm missing something but i can't figure it out. I think it has to do with loading the transformed coordinates into a new buffer and displaying the contents from the buffer... but i don't know how to do that.
Here's my code:
<br />
Imports Tao.OpenGl<br />
Imports Tao.Platform<br />
Imports Tao.FreeGlut<br />
<br />
Public Class frmMainWin<br />
<br />
Dim xTrans, yTrans, zTrans As Single<br />
<br />
Private Sub frmMainWin_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load<br />
myGlWindow.InitializeContexts()<br />
myGlWindow.AutoSwapBuffers = True<br />
<br />
'init glwindow<br />
Gl.glClearColor(0.0F, 0.0F, 0.0F, 0.0F)<br />
<br />
'Glu.gluLookAt(<br />
Gl.glViewport(0, 0, 400, 300)<br />
Gl.glMatrixMode(Gl.GL_PROJECTION)<br />
Gl.glLoadIdentity()<br />
<br />
Gl.glOrtho(0.0, 10.0, 0.0, 10.0, -10.0, 10.0)<br />
Gl.glMatrixMode(Gl.GL_MODELVIEW)<br />
Gl.glLoadIdentity()<br />
<br />
xTrans = 0<br />
yTrans = 0<br />
zTrans = 0<br />
<br />
End Sub<br />
<br />
Private Sub myGlWindow_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles myGlWindow.Paint<br />
Gl.glClear(Gl.GL_COLOR_BUFFER_BIT)<br />
<br />
Gl.glColor3f(0.2F, 0.2F, 0.8F)<br />
<br />
'Gl.glTranslatef(0.0F, 0.0F, 0.0F)<br />
Gl.glTranslatef(xTrans, yTrans, zTrans)<br />
Gl.glBegin(Gl.GL_TRIANGLES) 'Draw a triangle<br />
Gl.glVertex3f(0.5F, 1.0F, 0.0F)<br />
Gl.glVertex3f(0.0F, 0.0F, 0.0F)<br />
Gl.glVertex3f(1.0F, 0.0F, 0.0F)<br />
Gl.glEnd()<br />
<br />
End Sub<br />
<br />
Private Sub cmdUp_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdUp.Click<br />
'MsgBox("up")<br />
yTrans = yTrans + 1<br />
<br />
myGlWindow.SwapBuffers()<br />
<br />
End Sub<br />
End Class<br />
Any help would be greatly appreciated.
Thanks
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Hi,
do you invalidate the control somehow when changing yTrans? Otherwise, you won't notice any change. Check whether the Paint method is called at all using the debugger.
EDIT:
2 more things:
1.) Handle the Resize-Event and do the following:
Sorry, this is C#, but I don't really have an idea about VB. I guess this will help anyway:
<br />
private bool initialized = false;<br />
<br />
protected override void OnResize(EventArgs e)<br />
{<br />
if (initialized)<br />
{<br />
MakeCurrent();<br />
<br />
Gl.glViewport(0, 0, Width, Height);<br />
Gl.glMatrixMode(Gl.GL_PROJECTION);<br />
Gl.glLoadIdentity();<br />
Gl.glOrtho(0.0, 10.0, 0.0, 10.0, -10.0, 10.0);<br />
Gl.glMatrixMode(Gl.GL_MODELVIEW);<br />
Gl.glLoadIdentity();<br />
}<br />
}<br />
Also, make sure xTrans is not negative.
Last, why do you call SwapBuffers(), although you set AutoSwapBuffers to true before?
Hope this helps,
Chris
"Obstacles are those frightening things you see when you take your Eyes off your aim"
- Henry Ford
Articles
Blog
modified on Sunday, February 24, 2008 4:35 PM
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Thanks for the information. I'll handle the resize event in a few.
Just checking...Is there any fault in not handling it?
What do you mean by "invalidate the control?"
About the swapping buffers issue... i was working with trial and error to try and see why my code wasnt working...thats why both are there (by mistake). I've removed the swapbuffers() fn now.
The solution to my problem i found was to clear the buffer and do 'myGlWindow.refresh' just after the transformation calculations. Don't know why it worked...may be you could explain it to me...
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As long as your window cannot be resized, you do not really have to handle the resize event, that is true. However, as it is basically no more code (because you can just move most of your inialization code into it), I consider it better.
When a control is invalidated, you force the control and its children to redraw. The Invalidate()-method and the Refresh()-method do exactly that (only the latter also forces immediate redraw). Both methods are implemented by Control. However, Tao's SimpleOpenGlControl also offers a Draw()-method.
It's implementation is rather simple:
<br />
public void Draw() {<br />
this.Invalidate();<br />
}<br />
So it is essentially all the same thing! I suggest, however, to use the Draw()-method because future releases of the control might behave differently.
"Obstacles are those frightening things you see when you take your Eyes off your aim"
- Henry Ford
Articles
Blog
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Thanks for the information. iv;e taken it into consideration and now i'm using the Draw() method ... and handling resizing.
Now i have another problem, which i think is related, coz i'm convinced that there's fundamentally something wrong with my code.
Let me try explain it. I have objects drawn into the SimpleOpenGL control onClick of different buttons, but the problem is everytime i click on a button to draw (add) a new object... the previous one disappears. might you know what the problem is?
Then another thing. I'd like to put text into the control. Could you point me in the right direction to do this.
I read some other guys post about doing it in C# (somewhere near this one)... but i couldnt find some GDITexFont function or sth like that.
Your help is highly valued and appreciated.
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Hi,
from what you say I guess you don't really have a rendering-loop. See, your OpenGL image is drawn this way:
1. Clear screen (glClear(), etc.)
2. Draw allvisible objects in a certain order (lots of code)
3. Wait until OpenGL finished drawing (glFlush())
4. Swap front/back buffer to make the newly drawn objects visible (SwapBuffers())
So you have to remember a list of objects you want to draw. When one of your buttons is clicked, it should do sth like that:
myRenderList.Add(someObject);<br />
myOpenGLControl.Invalidate();
Note: Do NOT put any OpenGL commands in a button. You should have one and only one loop to do all the GL stuff!
Managing scene information (all objects, how to describe them, whether they are visible, etc.) is the hard part - the OpenGL commands are comparatively simple. (See the term 'scene graph' for more on that).
For text rendering, check NeHe's tutorial[^]. He presents three options. You might want to take a look at EaseSDK[^] to make things easier. It includes CeGUI, which supports not only text rendering, but real GUI elements such as buttons, scroll bars, etc.
Regards,
Chris
"Obstacles are those frightening things you see when you take your Eyes off your aim"
- Henry Ford
Articles
Blog
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Greetings,
This is a newbie question. After I have installed Platform SDK 2003 on my XP, the compiler couldn't find "dshow.h". Then, I specifically picked up DirectShow from the SDK and installed it once again. It still couldn't find the header. I have searched the entire "Programe Files" folder and there is no "dshow.h". Where did it go?
Thanks,
Best,
Jun
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After googling a bit, I seem to find a solution. Basically, I have to installed DirectX 9.0 Complete SDK, not other upgrades 
Best,
Jun
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Just curious, does Vista support MDX straight off, or does it have to be installed by the user?
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I tried simple pixel-based skin detection using YCrCb color space, It worked fine but not for every Image, i guess it's becoz of the Thresholds (Cr,Cb)i have selected, Can any 1 tell me or refer me a fast algorithm becoz mine take lots of time in detection.....??? 
(Jameel)
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Does anyone know how to read frame types from mpeg file?
I want to know if this frame is frame I, P or B
Some source code would be appreciated
Thanks
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Does anybody know if DXSmith is a good wrapper for DirectX? Before I get too involved in implementing it, I mean. ?
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hi all...
we are having a problm in our graduate project... in some phase in the project we needed to do meshing and triangulation for a person in a 2D image, wihch did succefully, thx God (now we have the vertices and triangles connecting them)... the next step is to prform texture mapping to our generated mesh... but after we set texture positions rendering the textured mesh... the output of texture mapping on my laptop wasn't properly drawn... although it's working properly at our supervisor's pc!! can anybody plz hlp us find a reason for this...
I'm sending a link having the original img and the output of the texture mapping on my laptop...
http://www.geocities.com/naroqueen/texture.html
we are using DirectX 9.0 in our texture mapping
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Hi naroqueen
My first thought is that you're laptop sux. But perhaps a more thought out response is to ask what graphics card you have in your laptop. It's obviously approximating the texture, but not shading across primitives. The fact that it works on your supervisors PC suggests the code is good, and that it's your laptop that is the problem... So look at the differences in system and setup.
Gavin
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