Re: FBO problem

Hello,

Is there any chance that I will be removed from this mailing list? I've=
=20
tried provided link to unsubscribe several times,
and still get messages.

Kind regards,
bear

----- Original Message -----=20
=46rom: "Gernot Ziegler" <[email protected]>
To: "Multiple recipients of list OPENGL-GAMEDEV-L"=20
<[email protected]>
Sent: Thursday, July 31, 2008 4:05 PM


>i am glad it worked out alright :) if you want, then send me the code =
one=20
>more time, marking where the difference lies with a #define and i can=20
>report it as a bug
>
> /gernot
>
> ________________ Reply Header ________________
> Subject: Re: FBO problem
> Author: Rhadam=E9s Carmona <[email protected]>
> Date: 31st July 2008 01:35
>
> Hello Guys
>
> Now works. The trick was to use GL_RGBA32F_ARB instead of GL_RGBA32F_=
NV
>
>
> Regards
>
> 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. A=
lso
>> note that your texture coordinates are different for GL_TEXTURE_RECT=
ANGLE
>> in contrast to GL_TEXTURE_2D, but it seems you only use texture rect=
angle
>> anyways.
>>
>>> I am playing a little bit with FBO. By the way, I am rendering a li=
ttle=20
>>> red
>>> quad in the middle of the FBO. It works perfect while I use
>>>
>>> glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0, 4, w, h, 0, GL_RGBA,
>>> GL_UNSIGNED_BYTE, NULL);
>>>
>>> yeah...a 8 bits FBO. I can change GL_UNSIGNED_BYTE by GL_FLOAT, and=
 I=20
>>> always
>>> get a 8 bits FBO... (well known behaviour).
>>>
>>> But, If I just change that command by
>>>
>>> glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0, GL_FLOAT_RGBA16_NV, w, h,
>>> 0,GL_RGBA, GL_UNSIGNED_SHORT, NULL);
>>>
>>> or even by
>>>
>>> glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0, GL_FLOAT_RGBA32_NV, w, h,
>>> 0,GL_RGBA, GL_FLOAT, NULL);
>>>
>>> then, I get a full screen red image (even if I comment the=20
>>> glBegin(QUADS) -
>>> glEnd() block to render the quad). The entire FBO gets the color of=
 my
>>> glColor3ub(255,0,0).
>>>
>>> I have test every OpenGL code line with glGetError(), and there is =
not=20
>>> any
>>> error. I also installed latest glew and drivers for my 8800 NVidia=20
>>> graphics
>>> board.
>>>
>>> I hope some of you could have a suggestion about what I am doing wr=
ong.
>>>
>>> Thanks a lot!
>>> Rhadam=E9s
>>>
>>>
>>> #include "glew.h"
>>> #include <gl/glut.h>
>>> #include <stdio.h>
>>> #include <stdlib.h>
>>> #include <iostream>
>>>
>>> #define GL_TEXTURE_RECTANGLE GL_TEXTURE_RECTANGLE_NV
>>>
>>> int height=3D0, width=3D0;
>>> GLuint g_fb=3D0;
>>> GLuint g_tex=3D0;
>>> GLuint g_depth=3D0;
>>>
>>> using namespace std;
>>>
>>>
>>> void Abort(char *msg)
>>> {
>>> printf(msg);
>>> exit(1);
>>> }
>>>
>>>
>>>
>>> void CheckErrorsGL(const char* location=3DNULL, ostream& ostr=3D st=
d::cerr )
>>> {
>>> GLuint errnum;
>>> const char *errstr;
>>> int counter =3D 0;
>>> while (errnum =3D glGetError())
>>> {
>>> errstr =3D reinterpret_cast<const char *>(gluErrorString(errnum));
>>> if(errstr)
>>> {
>>> ostr << errstr;
>>> }
>>> else
>>> {
>>> ostr << "Error " << errnum;
>>> }
>>>
>>> if(location)
>>> ostr << " at " << location;
>>> ostr << endl;
>>> counter++;
>>> }
>>> if (counter)
>>> Abort("Application cannot continue!\n");
>>>
>>> return;
>>> }
>>>
>>> void TestOpenGLError()
>>> {
>>> CheckErrorsGL(NULL);
>>> }
>>>
>>>
>>> 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();
>>> glViewport(0,0,width, height); TestOpenGLError();
>>> glClearColor(0,0,0,0); TestOpenGLError();
>>> glClear(GL_COLOR_BUFFER_BIT); TestOpenGLError();
>>>
>>>
>>> float size =3D 100.0f;
>>>
>>> glColor3f(1,0,0.5f);
>>> 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();
>>> //glColor3ub(0,0,0);
>>>
>>>
>>>
>>>
>>> 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();
>>> // back to 3D mode
>>>
>>>
>>> glFinish();
>>> glutSwapBuffers();
>>> }
>>>
>>> void Init()
>>> {
>>> GLenum err =3D glewInit();
>>> if (GLEW_OK !=3D err)
>>> // Problem: glewInit failed, something is seriously wrong.
>>> Abort("init error\n");
>>>
>>>
>>> TestOpenGLError();
>>> glGenFramebuffersEXT(1, &g_fb); ; TestOpenGLError();
>>> glBindTexture(GL_TEXTURE_2D, 0); TestOpenGLError();
>>> glBindTexture(GL_TEXTURE_RECTANGLE, 0); TestOpenGLError();
>>> glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, g_fb); TestOpenGLError();
>>>
>>> // create the texture for the color
>>> glGenTextures(1, &g_tex); &nbs p; TestOpenGLError();
>>> glBindTexture(GL_TEXTURE_RECTANGLE, g_tex); TestOpenGLError();
>>>
>>> glTexParameteri (GL_TEXTURE_RECTANGLE, GL_TEXTURE_WRAP_S, GL_CLAMP)=
;
>>> glTexParameteri (GL_TEXTURE_RECTANGLE, GL_TEXTURE_WRAP_T, GL_CLAMP)=
;
>>> glTexParameteri (GL_TEXTURE_RECTANGLE, GL_TEXTURE_MAG_FILTER,=20
>>> GL_NEAREST);
>>> glTexParameteri (GL_TEXTURE_RECTANGLE, GL_TEXTURE_MIN_FILTER,=20
>>> GL_NEAREST); TestOpenGLError(); &nbs p;
>>>
>>> //glTexImage2D(GL_TEXTURE_RECTANGLE, 0, 4, width, height, 0, GL_RGB=
A,=20
>>> GL_UNSIGNED_BYTE, NULL); //works
>>> //glTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_RGBA16, width, height,=20
>>> 0,GL_RGBA, GL_UNSIGNED_SHORT, NULL); //works
>>> //glTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_FLOAT_RGBA32_NV, w, h,=20
>>> 0,GL_RGBA, GL_FLOAT, NULL); //does not work
>>> glTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_FLOAT_RGBA16_NV, width, he=
ight,=20
>>> 0,GL_RGBA, GL_UNSIGNED_SHORT, NULL);
>>>
>>> TestOpenGLError();
>>> glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,GL_COLOR_ATTACHMENT0_E=
XT,GL_TEX=20
>>> TURE_RECTANGLE,g_tex, 0);
>>> if (glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT) !=3D=20
>>> GL_FRAMEBUFFER_COMPLETE_EXT)
>>> Abort("Error adding color to FBO\n");
>>> TestOpenGLError();
>>>
>>> glMatrixMode(GL_PROJECTION);
>>> glLoadIdentity();
>>> glOrtho(0,width,0,height,-1,100.0f);
>>> glMatrixMode(GL_TEXTURE);
>>> glLoadIdentity();
>>> glMatrixMode(GL_MODELVIEW);
>>> glLoadIdentity();
>>> glTranslatef(0,0,-5);
>>> }
>>>
>>> void Reshape(int w, int h)
>>> {
>>> width =3D w;
>>> height=3D h;
>>> glViewport(0,0,width,height);
>>> Init();
>>> }
>>>
>>>
>>> void main(int argc, char **argv)
>>> {
>>> glutInit(&argc, argv);
>>> glutInitDisplayString("double blue>=3D8 red>=3D8 alpha>=3D8 green>=3D=
8=20
>>> depth=3D32");// rgba>=3D8 depth>=3D24");
>>> glutInitWindowSize(640,480);
>>> glutInitWindowPosition(0,0);
>>> glutCreateWindow("test");
>>> glutSetWindowTitle("test");
>>>
>>>
>>> glutIdleFunc(Draw);
>>> glutDisplayFunc(Draw);
>>> glutReshapeFunc(Reshape);
>>>
>>> glutShowWindow();
>>> glutMainLoop();
>>>
>>> }
>>> ----- FAQ and OpenGL Resources at:=20
>>> http://www.geocities.com/SiliconValley/Hills/9956/OpenGL -- Author:=
=20
>>> [email protected]
>>> INET: [email protected] Fat City Hosting, San Diego, California -- =20
>>> http://www.fatcity.com
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>>
>> Servus,
>>   Gernot
>>
>> GPU. 3D Vision. Europe. Future. Now.
>> Drop by: www.mpi-sb.mpg.de/~gziegler - www.geofront.eu
>>
>
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> -----=20
> FAQ and OpenGL Resources at:
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>
> --=20
> Author: Gernot Ziegler
>  INET: [email protected]
>
> Fat City Hosting, San Diego, California -- http://www.fatcity.com
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----- 
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-- 
Author: bear007
  INET: [email protected]

Fat City Hosting, San Diego, California -- http://www.fatcity.com
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