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OpenGL rotation, while resizing

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[color=#333333]Hello all
[color=#333333]i am a beginner in OpenGL, i am using TAO framework with C#,
[color=#333333]i noticed that my render control stooped updating while re-sizing the window, i had overcome the problem of updating the content of the render control by calling the my game loop function in the event handler of the form re-size event

[color=#333333]but the rotation still have some work it is still not updated till the re-sizing process stop
[color=#333333]here is my code

[color=#333333]void GameLoop(double elapsedTime)
[color=#333333]{
[color=#333333]Gl.glViewport(0, 0, _openGLControl.Width, _openGLControl.Height);
[color=#333333]////////////////////
[color=#333333]float r = Color.DarkBlue.R / 255.0f;
[color=#333333]float g = Color.DarkBlue.G / 255.0f;
[color=#333333]float b = Color.DarkBlue.B / 255.0f;
[color=#333333]float a = Color.DarkBlue.A / 255.0f;
[color=#333333]Gl.glClearColor(r, g, b, a);
[color=#333333]Gl.glClear(Gl.GL_COLOR_BUFFER_BIT);
[color=#333333]Gl.glRotated(40 * elapsedTime, 0, 1, 0);
[color=#333333]Gl.glBegin(Gl.GL_TRIANGLES);
[color=#333333]{
[color=#333333]Gl.glColor3d(1, 1, 0);
[color=#333333]Gl.glVertex3d(-0.5,-0.5, 0);
[color=#333333]Gl.glColor3d(0, 1, 1);
[color=#333333]Gl.glVertex3d(0.5, -0.5, 0);
[color=#333333]Gl.glColor3d(1, 0, 1);
[color=#333333]Gl.glVertex3d(0, 0.5, 0);
[color=#333333]}
[color=#333333]Gl.glEnd();
[color=#333333]Gl.glFinish();
[color=#333333]_openGLControl.Refresh();
[color=#333333]}

[color=#333333]private void Form1_Resize(object sender, EventArgs e)
[color=#333333]{
[color=#333333]PreciseTimer _timer = new PreciseTimer();
[color=#333333]GameLoop(_timer.GetElapsedTime());
[color=#333333]}

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Start -> Control Panel -> System -> Advanced -> Performance/Settings
Animate windows when minimizing and maximizing = Checked


L. Spiro

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This is probably an issue with C#, and I haven’t used it much in years outside of one XNA project which is irrelevant here.
The first thing I would try is forcing a repaint operation and making sure it actually gets handled (as I recall, OnPaint() being called manually won’t create an update unless some dirty flag is set etc.)


L. Spiro

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i tried that


protected override void OnPaint(PaintEventArgs e)
{
PreciseTimer _timer = new PreciseTimer();
GameLoop(_timer.GetElapsedTime());
}

still not working
i don't think this a C# issue,
even in NEHE legacy tutorial lesson 4 written in c++, the rotation is stop while window re-sizing and window moving
i don't know if this is an intrinsic property in windows or what
i still need help

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I'm pretty sure this is tied to the fact that you're doing your rendering in the main thread, which also handles the user interface. In Windows, sizing (and AFAIR also moving) are blocking calls, which means that you may need to set up a separate thread for rendering. Just remember to keep all of your GL code in one thread as the render context isn't (safely) shared across threads.

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I'm pretty sure this is tied to the fact that you're doing your rendering in the main thread, which also handles the user interface. In Windows, sizing (and AFAIR also moving) are blocking calls, which means that you may need to set up a separate thread for rendering. Just remember to keep all of your GL code in one thread as the render context isn't (safely) shared across threads.


sounds good, i tried this




namespace GameLoop
{
public partial class Form1 : Form
{
FastLoop _fastLoop;

public Form1()
{
InitializeComponent();
_openGLControl.InitializeContexts();
backgroundWorker1.RunWorkerAsync();
}

void GameLoop(double elapsedTime)
{
Gl.glViewport(0, 0, _openGLControl.Width, _openGLControl.Height);
////////////////////
float r = Color.DarkBlue.R / 255.0f;
float g = Color.DarkBlue.G / 255.0f;
float b = Color.DarkBlue.B / 255.0f;
float a = Color.DarkBlue.A / 255.0f;
Gl.glClearColor(r, g, b, a);
Gl.glClear(Gl.GL_COLOR_BUFFER_BIT);
//Gl.glPointSize(25.0f);
//Gl.glLineWidth(5.0f);
Gl.glRotated(40 * elapsedTime, 0, 1, 0);
Gl.glBegin(Gl.GL_TRIANGLES);
{
Gl.glColor3d(1, 1, 0);
Gl.glVertex3d(-0.5,-0.5, 0);
Gl.glColor3d(0, 1, 1);
Gl.glVertex3d(0.5, -0.5, 0);
Gl.glColor3d(1, 0, 1);
Gl.glVertex3d(0, 0.5, 0);
}
Gl.glEnd();
Gl.glFinish();
if (this._openGLControl.InvokeRequired)
{
this._openGLControl.Invoke(new Action(Refresh));
}
}

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
_fastLoop = new FastLoop(GameLoop);
PreciseTimer _timer = new PreciseTimer();
GameLoop(_timer.GetElapsedTime());
}
}
}

it didn't work, more over, it sometimes make run time errors "access to protected memory"
?????????????????????

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