int main(int argc, char *argv[])
{
unsigned char *k;
bool keepdoing = true;
SDL_Init(SDL_INIT_VIDEO);
SDL_WM_SetCaption("My first OpenGL programm !",NULL);
SDL_SetVideoMode(640, 480, 32, SDL_OPENGL);
while (keepdoing)
{
SDL_PumpEvents();
k=SDL_GetKeyState(NULL);
if(k[SDLK_ESCAPE])
keepdoing=false;
if(k[SDLK_LEFT])
glRotatef(0.1f, 0.0f, 1.0f, 0.0f);
if(k[SDLK_RIGHT])
glRotatef(0.1f, 0.0f,-1.0f, 0.0f);
if(k[SDLK_UP])
glRotatef(0.1f, 1.0f, 0.0f, 0.0f);
if(k[SDLK_DOWN])
glRotatef(0.1f, -1.0f, 0.0f, 0.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslatef(0.0f, 0.0f, -7.0f);
glBegin(GL_QUADS);
glColor3f(0.0f,1.0f,0.0f); // Set The Color To Green
glVertex3f( 1.0f, 1.0f,-1.0f); // Top Right Of The Quad (Top)
glVertex3f(-1.0f, 1.0f,-1.0f); // Top Left Of The Quad (Top)
glVertex3f(-1.0f, 1.0f, 1.0f); // Bottom Left Of The Quad (Top)
glVertex3f( 1.0f, 1.0f, 1.0f);
glColor3f(1.0f,0.5f,0.0f); // Set The Color To Orange
glVertex3f( 1.0f,-1.0f, 1.0f); // Top Right Of The Quad (Bottom)
glVertex3f(-1.0f,-1.0f, 1.0f); // Top Left Of The Quad (Bottom)
glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Left Of The Quad (Bottom)
glVertex3f( 1.0f,-1.0f,-1.0f);
glColor3f(1.0f,0.0f,0.0f); // Set The Color To Red
glVertex3f( 1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Front)
glVertex3f(-1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Front)
glVertex3f(-1.0f,-1.0f, 1.0f); // Bottom Left Of The Quad (Front)
glVertex3f( 1.0f,-1.0f, 1.0f);
glColor3f(1.0f,1.0f,0.0f); // Set The Color To Yellow
glVertex3f( 1.0f,-1.0f,-1.0f); // Bottom Left Of The Quad (Back)
glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Right Of The Quad (Back)
glVertex3f(-1.0f, 1.0f,-1.0f); // Top Right Of The Quad (Back)
glVertex3f( 1.0f, 1.0f,-1.0f);
glColor3f(0.0f,0.0f,1.0f); // Set The Color To Blue
glVertex3f(-1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Left)
glVertex3f(-1.0f, 1.0f,-1.0f); // Top Left Of The Quad (Left)
glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Left Of The Quad (Left)
glVertex3f(-1.0f,-1.0f, 1.0f);
glColor3f(1.0f,0.0f,1.0f); // Set The Color To Violet
glVertex3f( 1.0f, 1.0f,-1.0f); // Top Right Of The Quad (Right)
glVertex3f( 1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Right)
glVertex3f( 1.0f,-1.0f, 1.0f); // Bottom Left Of The Quad (Right)
glVertex3f( 1.0f,-1.0f,-1.0f);
glEnd();
glFlush();
SDL_GL_SwapBuffers();
}
SDL_Quit();
return 0;
}
showing a simple cube!!!
Author
why doesn't this code show anything on screen? what's wrong??????? it should show a cube.
You have to set up the projection matrix for 3D and viewport. After that, set it to modelview to then draw the scene.
int main(int argc, char *argv[]){ unsigned char *k; bool keepdoing = true; SDL_Init(SDL_INIT_VIDEO); SDL_WM_SetCaption("My first OpenGL programm !",NULL); SDL_SetVideoMode(640, 480, 32, SDL_OPENGL); while (keepdoing) { SDL_PumpEvents(); k=SDL_GetKeyState(NULL); if(k[SDLK_ESCAPE]) keepdoing=false; if(k[SDLK_LEFT]) glRotatef(0.1f, 0.0f, 1.0f, 0.0f); if(k[SDLK_RIGHT]) glRotatef(0.1f, 0.0f,-1.0f, 0.0f); if(k[SDLK_UP]) glRotatef(0.1f, 1.0f, 0.0f, 0.0f); if(k[SDLK_DOWN]) glRotatef(0.1f, -1.0f, 0.0f, 0.0f); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); //NEW CODE glViewport( 0, 0, ( GLsizei )width, ( GLsizei )height ); glMatrixMode( GL_PROJECTION ); glLoadIdentity(); gluPerspective( 45.0f, 640.0f / 480.0f, 0.1f, 100.0f); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glTranslatef(0.0f, 0.0f, -7.0f); glBegin(GL_QUADS); glColor3f(0.0f,1.0f,0.0f); // Set The Color To Green glVertex3f( 1.0f, 1.0f,-1.0f); // Top Right Of The Quad (Top) glVertex3f(-1.0f, 1.0f,-1.0f); // Top Left Of The Quad (Top) glVertex3f(-1.0f, 1.0f, 1.0f); // Bottom Left Of The Quad (Top) glVertex3f( 1.0f, 1.0f, 1.0f); glColor3f(1.0f,0.5f,0.0f); // Set The Color To Orange glVertex3f( 1.0f,-1.0f, 1.0f); // Top Right Of The Quad (Bottom) glVertex3f(-1.0f,-1.0f, 1.0f); // Top Left Of The Quad (Bottom) glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Left Of The Quad (Bottom) glVertex3f( 1.0f,-1.0f,-1.0f); glColor3f(1.0f,0.0f,0.0f); // Set The Color To Red glVertex3f( 1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Front) glVertex3f(-1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Front) glVertex3f(-1.0f,-1.0f, 1.0f); // Bottom Left Of The Quad (Front) glVertex3f( 1.0f,-1.0f, 1.0f); glColor3f(1.0f,1.0f,0.0f); // Set The Color To Yellow glVertex3f( 1.0f,-1.0f,-1.0f); // Bottom Left Of The Quad (Back) glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Right Of The Quad (Back) glVertex3f(-1.0f, 1.0f,-1.0f); // Top Right Of The Quad (Back) glVertex3f( 1.0f, 1.0f,-1.0f); glColor3f(0.0f,0.0f,1.0f); // Set The Color To Blue glVertex3f(-1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Left) glVertex3f(-1.0f, 1.0f,-1.0f); // Top Left Of The Quad (Left) glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Left Of The Quad (Left) glVertex3f(-1.0f,-1.0f, 1.0f); glColor3f(1.0f,0.0f,1.0f); // Set The Color To Violet glVertex3f( 1.0f, 1.0f,-1.0f); // Top Right Of The Quad (Right) glVertex3f( 1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Right) glVertex3f( 1.0f,-1.0f, 1.0f); // Bottom Left Of The Quad (Right) glVertex3f( 1.0f,-1.0f,-1.0f); glEnd(); glFlush(); SDL_GL_SwapBuffers(); } SDL_Quit(); return 0;}
Author
Mmmm. The problem is that i am following the nehe tutorials and there it doesn't say anything about that. Are those tutorials wrong?
This topic is closed to new replies.
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