Re: GLSL + 6800 + Multiple steps by frame

You need to call glFinish (), not glFlush (). glFlush () means that all 
commands are passed to OpenGL for processing - not that the processing 
has finished (for example, if you use OpenGL via Network, glFlush () 
send all commands in a packet). glFinish () on the other hand does wait 
until the rendering has finished.

Cheers

Matthäus Chajdas

Rhadamés Carmona schrieb:
> Hello Everybody
> 
> I am programming with 3D textures and GLSL. At some point, I was interested 
> in making 2 renderings in one frame, for comparrison...
> 
> void DrawScene()
> {
>   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
>   Render();
>   glFlush();
>   ReadFrameBuffer(A);
>   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
>   Render();
>   glFlush();
>   ReadFrameBuffer(B);
>   difference = B-A;
>   // Do something with difference, here!....
>   glFlnish();
>   glutSwapBuffer();
> }
> 
> The second rendering is not correct... I get a mess. But, If I put an 
> Sleep(200) after every glFluch, everything is ok!.... Coudl you give me any 
> clue about what the hell is goiing on?
> 
> Cheers Guys!
> 
> Rix
> 
> Note: I am using latest drivers.... 
> 
> ----- 
> FAQ and OpenGL Resources at:
>   http://www.geocities.com/SiliconValley/Hills/9956/OpenGL
> 
----- 
FAQ and OpenGL Resources at:
  http://www.geocities.com/SiliconValley/Hills/9956/OpenGL

-- 
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