Re: FBO problem

Hello Gernot

Thanks for your help. I have added a little shader, but I still get the s=
ame=20
problem.


//Fragment
void main()
{
  gl_FragColor =3D vec4(0.0,1.0,0.0,0.0);    // notice, it is blue!
}

// vertex
void main()
{
  gl_Position =3D gl_ProjectionMatrix * gl_Vertex;
}


There is no error after compiling the shaders, and link. Now, my draw=20
callback is this

void Draw()
{
// working with main object (the application)
if (!width || !height)
  return;
glClearColor(0,0,0,0);
glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);

glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, g_fb); TestOpenGLError();
glDrawBuffer( GL_COLOR_ATTACHMENT0_EXT ); TestOpenGLError();
glEnable(GL_TEXTURE_RECTANGLE);
glViewport(0,0,width, height); TestOpenGLError();
glClearColor(0,0,0,0); TestOpenGLError();
glClear(GL_COLOR_BUFFER_BIT); TestOpenGLError();

/////////////////////////////// SHADER //////////////////////////////////=
//
glUseProgramObjectARB(m_slProgram); TestOpenGLError();
float size =3D 100.0f;
glColor3f(1,0,0);    // it is red...but, I am using shaders
glBegin(GL_QUADS);
  glVertex2f(width*0.5f - size, height*0.5f - size);
  glVertex2f(width*0.5f - size, height*0.5f + size);
  glVertex2f(width*0.5f + size, height*0.5f + size);
  glVertex2f(width*0.5f + size, height*0.5f - size);
glEnd();
glUseProgramObjectARB(0);
/////////////////////////////////////////////////////////////////////////=
/
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
glDrawBuffer( GL_BACK );
glViewport(0,0,width, height); TestOpenGLError();
glFinish();
glEnable(GL_TEXTURE_RECTANGLE);
glBindTexture(GL_TEXTURE_RECTANGLE, g_tex); TestOpenGLError();
glEnable(GL_TEXTURE_RECTANGLE); TestOpenGLError();
glBegin(GL_QUADS);
  glTexCoord2f(0.0f, 0.0f);
  glVertex2f(0.0f, 0.0f);
  glTexCoord2f(0.0f, height);
  glVertex2f(0.0f, height);
  glTexCoord2f(width, height);
  glVertex2f(width, height);
  glTexCoord2f(width, 0.0f);
  glVertex2f(width, 0.0f);
glEnd();
glDisable(GL_TEXTURE_RECTANGLE); TestOpenGLError();
glFinish();
glutSwapBuffers();
}


I do not know why this code works perfect for 8 bits FBO, but does not wo=
rk=20
for floating point FBO.
I get a full screen RED quad (if FBO is not 8bits), but the correct resul=
t=20
must be a blue quad of 100x100 in the middle of the screen.


Thanks aghain for any help!
Rhadam=E9s




----- Original Message -----=20
To: "Multiple recipients of list OPENGL-GAMEDEV-L"=20
<[email protected]>
Sent: Wednesday, July 30, 2008 5:50 AM


> Hej,
>
> have you actually used shaders? Float FBOs only work with shaders. Also
> note that your texture coordinates are different for GL_TEXTURE_RECTANG=
LE
> in contrast to GL_TEXTURE_2D, but it seems you only use texture rectang=
le
> anyways.=20


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