CODEWITHSUNDEEP
c++openglx11glx
Alatriste
Alatriste

Reputation: 567

GLX context framebuffer reading

I'm trying to read pixels from GLX context. here is how I'm creating context

int Attributes[] =
{
  GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
  GLX_RENDER_TYPE,   GLX_RGBA_BIT,
  GLX_DOUBLEBUFFER,  GL_TRUE,
  GLX_RED_SIZE,      8,
  GLX_GREEN_SIZE,    8,
  GLX_BLUE_SIZE,     8,
  None
};

visual = glXChooseVisual(display,
                               DefaultScreen(display), 
                                   Attributes);


if (visual == NULL)
{
  return -1;
}

glxContext = glXCreateContext(display, visual, NULL, GL_TRUE);


XLockDisplay(displayGLX_);

int result = glXMakeCurrent(display, windowHandle, glxContext);

XInitThreads();

then I'm rendering simple triangle and I want to read that buffer by glReadPixels. Is there any posibility to do it?

glReadBuffer(GL_BACK);

glXSwapBuffers(display, windowHandle);

and then I'm calling 

glReadPixels

Upvotes: 2

Views: 296

Answers (1)

AnalyticaL
AnalyticaL

Reputation: 521

Dont swap 1st, you read from the BACK buffer, so glReadPixels before swap...

Upvotes: 3

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