| Forum List • Thread List • Refresh • New Topic • Search • Previous • Next  1  |  1. Two issues: OpenGL and image saving#4112 Posted by: 2004-05-14 05:20:24 | Hi all,
I've got a nearly-completed wxWidgets/wxWindows project built here (based on 2.4.2; cross-compiling between Windows and Linux), and there's two things I just can't figure out... and Google-ing didn't help much either.
Firstly, I've got my program functioning the way I want under Windows, but under Linux (Mandrake, IDE: KDevelop3, Mesa for OpenGL), the openGL renders as a lovely black screen. Well, that's not entirely true. If I use a glFrustum call, all renders perfectly. However, when I switch to a gluPerspective call, I get the black screen issue. It's not a clipping problem or anything like that, since it renders properly under Windows. It's also not an OpenGL or GLU issue, since I can run other non-wxWidgets programs using gluPerspective without problem. So I'm left to believe this is a wxWidgets problem. Has anyone heard of this -- and hopefully, heard of a solution, as well?
Secondly, I've defined an openGL canvas ( class canvas: public wxGLCanvas {...}; ) that I want to be able to capture and export to an image (jpg, bmp, whatever). I managed to find a newsgroup posting that said I should be able to do this in about 10 lines, but I can't for the life of me figure it out. Part of the problem could be that I'm using a wxPaintDC rather than a wxClientDC. However, this is necessity, because switching to a wxClientDC causes issues with disappearing message/dialog boxes. Anyways, I'm looking for some kind person to help me out with a function that will take my openGL canvas and save it as an image.
Thanks all; sorry for the long post/explanation
Maverick | 2. Re: Two issues: OpenGL and image saving #5262 Posted by: 2004-10-19 00:01:28 | I can't help with the first question other than suggesting that you update your OpenGL drivers.
For the second question, try something like the following:
void YourGLCanvas::TakeScreenshot() {
wxSize s = GetSize() ;
// Copy from OpenGL
wxImage image(s.GetWidth(), s.GetHeight());
unsigned char* pPixelData = image.GetData(); // Pointer to image buffer
glReadPixels(0, 0, s.GetWidth(), s.GetHeight(), GL_RGB, GL_UNSIGNED_BYTE,
pPixelData);
// flip the image to the proper orientation
image = image.Mirror(false);
if (addedImageHandler == 0) {
wxInitAllImageHandlers();
addedImageHandler = 1;
}
image.SaveFile("screenshot1.jpeg", wxBITMAP_TYPE_JPEG);
}
Hope this helps. . .
| | Forum List • Thread List • Refresh • New Topic • Search • Previous • Next 1 |
|
|
搜索
论坛
Home
回顶部
g.yi.org Hits:0
