OpenGL: always one color

Question

I am writing a program in windows using c++, opengl 2.1and SDL, and I have some problems with vertex colors.

I use glColor3fto set the color for each set of vertices, but it doesn't seem to work. I get every vertex red, no matter what color I choose. I checked the values ​​passed on glColor3fand they really are not 1.f, 0.f, 0.f ...

Has anyone encountered such a problem or knows what might cause it? Maybe I won’t go into any library? Or do you think this might be a problem with the SDL initialization code (it shouldn't be, since I used it before it was correct)?

EDIT4: Solved .. This is really a gpu problem, I got the drivers from the manufacturer and now it works fine ... go figure

EDIT: I also do not use any lighting, texture or anything like that. Graphically, I just set the window and talk about how to draw some vertices and colors.

EDIT2: Of course, but I very much doubt that there is a problem:

int GLmain::redraw(GLvoid)                              
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glBegin(GL_LINE_STRIP);
for(int i=0; i<s->divs.size(); i++){
    vec3 v = s->divs.at(i).getPosition();
    vec3 c = s->divs.at(i).getColor();
    glColor3f(c.get(0),c.get(1),c.get(2));
    glVertex3f(v.get(0),v.get(1),v.get(2));
}
glEnd();

return TRUE;
}

As you can see, pretty standard stuff .. c contains values ​​between 0.0-1.0. I just tried to start some other work that I did with OpenGL, and everything also appears in red (this was not earlier), so I assume that this has something to do with the libraries I use:

opengl32.lib sdl.lib sdlmain.lib glu32.lib

SDL - version 1.2.14. Also, could this be a problem with my gpu? Everything else appears with the usual colors, but .. web browser, video, games, etc.

EDIT3: SDL initialization code:

int done = 0;
int w = 800;
int h = 600;
GLenum gl_error;
char* sdl_error;
SDL_Event event;
Init_OpenGL(argc, argv, w, h); // start window and OpenGL
SDL_WM_SetCaption( "MySlinky", "" ); /* Set the window manager title bar */

void Init_OpenGL(int argc, char* argv[], int w, int h)
{
    int rgb_size[3];
    int bpp = 0;
    Uint32 video_flags = SDL_OPENGL;
    if( SDL_Init( SDL_INIT_VIDEO ) < 0 ) {
        fprintf(stderr,"Couldn't initialize SDL: %s\n",SDL_GetError());
        exit( 1 );
    }
    /* See if we should detect the display depth */
    if ( bpp == 0 ) {
        if ( SDL_GetVideoInfo()->vfmt->BitsPerPixel <= 8 ) {
            bpp = 8;
        } else {
            bpp = 16;  /* More doesn't seem to work */
        }
    }

    /* Initialize the display */
    switch (bpp) {
        case 8:
            rgb_size[0] = 3;
            rgb_size[1] = 3;
            rgb_size[2] = 2;
            break;
        case 15:
        case 16:
            rgb_size[0] = 5;
            rgb_size[1] = 5;
            rgb_size[2] = 5;
            break;
        default:
            rgb_size[0] = 8;
            rgb_size[1] = 8;
            rgb_size[2] = 8;
            break;
    }

    SDL_GL_SetAttribute( SDL_GL_RED_SIZE, rgb_size[0] ); // Sets bits per channel
    SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, rgb_size[1] );
    SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, rgb_size[2] );
    SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 24 ); // 3 channels per pixel (R, G and B)
    SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
    SDL_GL_SetAttribute( SDL_GL_ACCELERATED_VISUAL, 1 );
    if ( SDL_SetVideoMode( w, h, bpp, video_flags ) == NULL ) {
        fprintf(stderr, "Couldn't set GL mode: %s\n", SDL_GetError());
        SDL_Quit();
        exit(1);
    }
}

Answer 1

:

• , . . , (!?), ..

• "" OpenGL (: , c.get(1) 0?).

• : OpenGL /! . , ..

, : printf("c=(%f,%f,%f)",(float)c.get(0),(float)c.get(1),(float)c.get(2));

Answer 2

:

glShadeModel( GL_SMOOTH );

, ​​ ?

Init_OpenGL.

Answer 3

, , , , glUseProgram(NULL);, opengl , .