Re: FBO problem

i am glad it worked out alright :) if you want, then send me the code one=
 more time, marking where the difference lies with a #define and i can re=
port 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" <OPENGL-GAMEDEV-L@fatc=
ity.com>
Sent: Wednesday, July 30, 2008 5:50 AM


> Hej,
>=20
> have you actually used shaders? Float FBOs only work with shaders. Also=
=20
> note that your texture coordinates are different for GL_TEXTURE_RECTANG=
LE=20
> in contrast to GL_TEXTURE_2D, but it seems you only use texture rectang=
le=20
> anyways.
>=20
>> I am playing a little bit with FBO. By the way, I am rendering a littl=
e red
>> quad in the middle of the FBO. It works perfect while I use
>>=20
>> glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0, 4, w, h, 0, GL_RGBA,
>> GL_UNSIGNED_BYTE, NULL);
>>=20
>> yeah...a 8 bits FBO. I can change GL_UNSIGNED_BYTE by GL_FLOAT, and I =
always
>> get a 8 bits FBO... (well known behaviour).
>>=20
>> But, If I just change that command by
>>=20
>> glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0, GL_FLOAT_RGBA16_NV, w, h,
>> 0,GL_RGBA, GL_UNSIGNED_SHORT, NULL);
>>=20
>> or even by
>>=20
>> glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0, GL_FLOAT_RGBA32_NV, w, h,
>> 0,GL_RGBA, GL_FLOAT, NULL);
>>=20
>> then, I get a full screen red image (even if I comment the glBegin(QUA=
DS) -
>> glEnd() block to render the quad). The entire FBO gets the color of my
>> glColor3ub(255,0,0).
>>=20
>> I have test every OpenGL code line with glGetError(), and there is not=
 any
>> error. I also installed latest glew and drivers for my 8800 NVidia gra=
phics
>> board.
>>=20
>> I hope some of you could have a suggestion about what I am doing wrong.
>>=20
>> Thanks a lot!
>> Rhadam=E9s
>>=20
>>=20
>> #include "glew.h"
>> #include <gl/glut.h>
>> #include <stdio.h>
>> #include <stdlib.h>
>> #include <iostream>
>>=20
>> #define GL_TEXTURE_RECTANGLE GL_TEXTURE_RECTANGLE_NV
>>=20
>> int height=3D0, width=3D0;
>> GLuint g_fb=3D0;
>> GLuint g_tex=3D0;
>> GLuint g_depth=3D0;
>>=20
>> using namespace std;
>>=20
>>=20
>> void Abort(char *msg)
>> {
>> printf(msg);
>> exit(1);
>> }
>>=20
>>=20
>>=20
>> void CheckErrorsGL(const char* location=3DNULL, ostream& ostr=3D std::=
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;
>> }
>>=20
>> if(location)
>> ostr << " at " << location;=20
>> ostr << endl;
>> counter++;
>> }
>> if (counter)
>> Abort("Application cannot continue!\n");
>>=20
>> return;
>> }
>>=20
>> void TestOpenGLError()
>> {
>> CheckErrorsGL(NULL);
>> }
>>=20
>>=20
>> void Draw()
>> {
>> // working with main object (the application)
>> if (!width || !height)
>> return;
>>=20
>> glClearColor(0,0,0,0);
>> glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
>>=20
>>=20
>> 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();
>>=20
>>=20
>> float size =3D 100.0f;
>>=20
>> 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);
>>=20
>>=20
>>=20
>>=20
>> 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();
>>=20
>>=20
>> 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();
>>=20
>> glDisable(GL_TEXTURE_RECTANGLE); TestOpenGLError();
>> // back to 3D mode
>>=20
>>=20
>> glFinish();
>> glutSwapBuffers();
>> }
>>=20
>> void Init()
>> {
>> GLenum err =3D glewInit();
>> if (GLEW_OK !=3D err)
>> // Problem: glewInit failed, something is seriously wrong.
>> Abort("init error\n");
>>=20
>>=20
>> 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();
>>=20
>> // create the texture for the color
>> glGenTextures(1, &g_tex); &nbs p; TestOpenGLError();
>> glBindTexture(GL_TEXTURE_RECTANGLE, g_tex); TestOpenGLError();
>>=20
>> 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, GL_NEARE=
ST);
>> glTexParameteri (GL_TEXTURE_RECTANGLE, GL_TEXTURE_MIN_FILTER, GL_NEARE=
ST); TestOpenGLError(); &nbs p;
>>=20
>> //glTexImage2D(GL_TEXTURE_RECTANGLE, 0, 4, width, height, 0, GL_RGBA, =
GL_UNSIGNED_BYTE, NULL); //works
>> //glTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_RGBA16, width, height, 0,GL=
_RGBA, GL_UNSIGNED_SHORT, NULL); //works
>> //glTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_FLOAT_RGBA32_NV, w, h, 0,GL=
_RGBA, GL_FLOAT, NULL); //does not work
>> glTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_FLOAT_RGBA16_NV, width, heigh=
t, 0,GL_RGBA, GL_UNSIGNED_SHORT, NULL);
>>=20
>> TestOpenGLError();
>> glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,GL_COLOR_ATTACHMENT0_EXT,=
GL_TEX TURE_RECTANGLE,g_tex, 0);
>> if (glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT) !=3D GL_FRAMEBUFFE=
R_COMPLETE_EXT)
>> Abort("Error adding color to FBO\n");
>> TestOpenGLError();
>>=20
>> glMatrixMode(GL_PROJECTION);
>> glLoadIdentity();
>> glOrtho(0,width,0,height,-1,100.0f);
>> glMatrixMode(GL_TEXTURE);
>> glLoadIdentity();
>> glMatrixMode(GL_MODELVIEW);
>> glLoadIdentity();
>> glTranslatef(0,0,-5);
>> }
>>=20
>> void Reshape(int w, int h)
>> {
>> width =3D w;
>> height=3D h;
>> glViewport(0,0,width,height);
>> Init();
>> }
>>=20
>>=20
>> void main(int argc, char **argv)
>> {
>> glutInit(&argc, argv);
>> glutInitDisplayString("double blue>=3D8 red>=3D8 alpha>=3D8 green>=3D8=
 depth=3D32");// rgba>=3D8 depth>=3D24");
>> glutInitWindowSize(640,480);
>> glutInitWindowPosition(0,0);
>> glutCreateWindow("test");
>> glutSetWindowTitle("test");
>>=20
>>=20
>> glutIdleFunc(Draw);
>> glutDisplayFunc(Draw);
>> glutReshapeFunc(Reshape);
>>=20
>> glutShowWindow();
>> glutMainLoop();
>>=20
>> }
>> ----- FAQ and OpenGL Resources at: http://www.geocities.com/SiliconVal=
ley/Hills/9956/OpenGL -- Author: [email protected]
>> INET: [email protected] Fat City Hosting, San Diego, California -- http=
://www.fatcity.com
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>> command for other information (like subscribing).
>>
>=20
> Servus,
>   Gernot
>=20
> GPU. 3D Vision. Europe. Future. Now.
> Drop by: www.mpi-sb.mpg.de/~gziegler - www.geofront.eu
>

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