Hi Stefan,
I can now display one of my textures with Equalizer, using the basic
config.eqc . However, something is still wrong: the screen is out of
control :-) (I don't believe my data is going to the back buffer as
I wish it to). So here is my question:
In my code, I have a framebuffer with two attached buffers, used in
ping-pong fashion. I display 9 times into this buffer, then display
the image to the back screen using glDrawBuffer(GL_BACK). That was standalone.
I send you some code to give you an idea. I call run() from within
franeDraw(). Should this work? You'll note that there is no swap buffer
method call in my code.
Best,
Gordon
------------------
void DistanceTransform::run()
{
stepLength = tex_size / 2;
for (int i=0; i < 9; i++) {
if (stepLength < 1) stepLength = 1;
updateTexture();
stepLength /= 2;
}
pp->toBackBuffer();
}
-----------------------------------
----------------------------
void PingPong::toBackBuffer()
{
drawFBOtoScreen_b(GL_BACK, getTexture());
}
void PingPong::drawFBOtoScreen_b(GLenum screen, TexOGL& texture)
// unfortunately, the image on the screen appears to be 8 bit.
// simply draw the texture to the screen. The second argument is not
necessary.
{
// Perhaps I should remember the active shader and reactivate it
at the end?
// This method is called because most people will forget it.
glUseProgram(0);
if (screen != GL_FRONT && screen != GL_BACK) {
printf("drawFBOtoScreen: screen should be GL_FRONT or GL_BACK\n");
exit(0);
//return;
}
FramebufferObject::Disable(); // must be done BEFORE glDrawBuffer()
glDrawBuffer(screen); // front or back
int tg = texture.getTarget() == GL_TEXTURE_2D ? 0 : 1;
texture.bind();
glEnable(GL_TEXTURE_2D);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
gluOrtho2D(0., 1., 0., 1.);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
int sz = texture.getTarget() == GL_TEXTURE_2D ? 1.0 : texture.getHeight();
// should not clear the screen here. It should be cleared at the
beginning of the
// main display function
//glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glBegin(GL_QUADS);
glTexCoord2f(0., 0.);
glVertex2f(0., 0.);
glTexCoord2f(sz, 0.);
glVertex2f(1., 0.);
glTexCoord2f(sz, sz);
glVertex2f(1., 1.);
glTexCoord2f(0, sz);
glVertex2f(0., 1.);
glEnd();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glDisable(texture.getTarget());
}
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