> I just want to reach a true fullscreen mode with a Fl_gl_window. > (for a screensaver mode for instance) > > I thought It was clear from my previous email.
No, I'm sorry but don't think it was clear, or I would not have asked. Here is a worked example. It is not the most elegant solution, but works fine. It is simply Greg's image textured cube demo tweaked to run full-screen. -------------------- #include <stdio.h> #include <stdlib.h> #include <math.h> #include <FL/Fl.h> #include <FL/Fl_Window.H> #include <FL/Fl_Gl_Window.H> #include <FL/gl.h> #include <FL/Fl_Shared_Image.H> // fl_register_images() // // OpenGL spinning cube with PNG image texturemap -- erco/ian 03/23/09 // tweaked to be full-screen: 2009-03-25, imm // // Assumes /tmp/texture-128.png exists, and x/y res is 64x64, 128x128, etc. // For an example image, see http://seriss.com/people/erco/fltk/texture-128.png // // Builds with: // fltk-config --use-gl --use-images --compile foo.cxx // #define WIN_W 400 // window width #define WIN_H 400 // window height #define FPS (1.0/24.0) // frames per second playback // // OpenGL class to show texturemapped cube // class MyGlWindow : public Fl_Gl_Window { double spin; GLuint TexID; const char *texturefilename; // TIMER CALLBACK // Handles rotation the object // static void Timer_CB(void *userdata) { MyGlWindow *mygl = (MyGlWindow*)userdata; mygl->spin += 2.0; // spin mygl->redraw(); Fl::repeat_timeout(FPS, Timer_CB, userdata); } public: // CTOR MyGlWindow(int x, int y, int w, int h, const char *l=0) : Fl_Gl_Window(x,y,w,h,l) { spin = 0.0; Fl::add_timeout(FPS, Timer_CB, (void*)this); // 24fps timer texturefilename = "/tmp/texture-128.png"; end(); } void TextureFilename(const char *val) { texturefilename = val; } const char *TextureFilename() const { return(texturefilename); } // PERSPECTIVE VIEW // Same as gluPerspective().. // void Perspective(GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdouble zFar) { GLdouble xmin, xmax, ymin, ymax; ymax = zNear * tan(fovy * M_PI / 360.0); ymin = -ymax; xmin = ymin * aspect; xmax = ymax * aspect; glFrustum(xmin, xmax, ymin, ymax, zNear, zFar); } // LOAD TEXTUREMAP USING FLTK'S SHARED IMAGE LIB void LoadTexture(const char *filename, GLuint &TexID) { Fl_Shared_Image *img = Fl_Shared_Image::get(filename); // load texturemap if ( ! img ) { fprintf(stderr, "%s: unknown image format\n", filename); exit(1); } if ( img->d() != 3 ) { fprintf(stderr, "%s: image depth is %d (expected 3)\n", filename, img->d()); exit(1); } glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, img->w(), img->h(), 0, GL_RGB, GL_UNSIGNED_BYTE, img->data()[0]); img->release(); } void CreateCube() { // Materials GLfloat ambient[] = { 0.3, 0.3, 0.3, 1.0 }; GLfloat diffuse[] = { 0.6, 0.6, 0.6, 1.0 }; GLfloat specular[] = { 1.0, 1.0, 1.0, 1.0 }; GLfloat shininess[] = { 0.9 * 128.0 }; // 1=dull, 127=shiny GLfloat emission[] = { 0.0, 0.0, 0.0, 0.0 }; glMaterialfv(GL_FRONT, GL_AMBIENT, ambient); glMaterialfv(GL_FRONT, GL_DIFFUSE, diffuse); glMaterialfv(GL_FRONT, GL_SPECULAR, specular); glMaterialfv(GL_FRONT, GL_SHININESS, shininess); glMaterialfv(GL_FRONT, GL_EMISSION, emission); static float cube_vertexes[6][4][4] = { // cube and normals from SGI opengl example { { -1.0, -1.0, -1.0, 1.0 }, // "scube.c" by Mark J. Kilgard { -1.0, -1.0, 1.0, 1.0 }, { -1.0, 1.0, 1.0, 1.0 }, { -1.0, 1.0, -1.0, 1.0 } }, { { 1.0, 1.0, 1.0, 1.0 }, { 1.0, -1.0, 1.0, 1.0 }, { 1.0, -1.0, -1.0, 1.0 }, { 1.0, 1.0, -1.0, 1.0 } }, { { -1.0, -1.0, -1.0, 1.0 }, { 1.0, -1.0, -1.0, 1.0 }, { 1.0, -1.0, 1.0, 1.0 }, { -1.0, -1.0, 1.0, 1.0 } }, { { 1.0, 1.0, 1.0, 1.0 }, { 1.0, 1.0, -1.0, 1.0 }, { -1.0, 1.0, -1.0, 1.0 }, { -1.0, 1.0, 1.0, 1.0 } }, { { -1.0, -1.0, -1.0, 1.0 }, { -1.0, 1.0, -1.0, 1.0 }, { 1.0, 1.0, -1.0, 1.0 }, { 1.0, -1.0, -1.0, 1.0 } }, { { 1.0, 1.0, 1.0, 1.0 }, { -1.0, 1.0, 1.0, 1.0 }, { -1.0, -1.0, 1.0, 1.0 }, { 1.0, -1.0, 1.0, 1.0 } } }; static float cube_normals[6][4] = { { -1.0, 0.0, 0.0, 0.0 }, { 1.0, 0.0, 0.0, 0.0 }, { 0.0, -1.0, 0.0, 0.0 }, { 0.0, 1.0, 0.0, 0.0 }, { 0.0, 0.0, -1.0, 0.0 }, { 0.0, 0.0, 1.0, 0.0 } }; // Cube glColor3f(1.0, 1.0, 1.0); for ( int i=0; i<6; i++ ) { glNormal3fv(&cube_normals[i][0]); glBegin(GL_POLYGON); glTexCoord2f(1.0, 0.0); glVertex4fv(&cube_vertexes[i][0][0]); glTexCoord2f(0.0, 0.0); glVertex4fv(&cube_vertexes[i][1][0]); glTexCoord2f(0.0, 1.0); glVertex4fv(&cube_vertexes[i][2][0]); glTexCoord2f(1.0, 1.0); glVertex4fv(&cube_vertexes[i][3][0]); glEnd(); } } void CreateLight() { GLfloat light_position[] = { 0.0, 0.0, 0.0, 1.0 }; // XYZW (W=0: xyz=direction, W!=0, xyz=position) GLfloat light_white[] = { 1.0, 1.0, 1.0, 0.0 }; glLightfv(GL_LIGHT0, GL_POSITION, light_position); glLightfv(GL_LIGHT0, GL_AMBIENT, light_white); } // RESHAPED VIEWPORT // OpenGL stuff to do whenever window changes size // void ReshapeViewport() { glViewport(0, 0, w(), h()); glMatrixMode(GL_PROJECTION); glLoadIdentity(); GLfloat ratio = (float(w()) / float(h())); Perspective(30.0, ratio, 1.0, 30.0); glTranslatef(0.0, 0.0, -8.0); } // OPENGL INITIALIZATION // OpenGL stuff to do *only once* on startup. // void GlInit() { // Texture Map Init glGenTextures(1, &TexID); glBindTexture(GL_TEXTURE_2D, TexID); glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); glPixelStorei(GL_UNPACK_ALIGNMENT, 1); // Load texture image, bind to TexID LoadTexture(TextureFilename(), TexID); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glEnable(GL_TEXTURE_2D); // Lighting Init glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); glShadeModel(GL_SMOOTH); // Misc OpenGL Init glEnable(GL_DEPTH_TEST); // hidden surface glDepthFunc(GL_LEQUAL); } // FLTK DRAW // Called by FLTK to draw the scene. // void draw() { // Initialize/handle reshaped viewport if ( !valid() ) { valid(1); // Make sure we only do GlInit() once static int first_time = 1; if ( first_time ) { first_time = 0; GlInit(); } ReshapeViewport(); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); // Model view glMatrixMode(GL_MODELVIEW); } // Clear glClearColor(.5,.5,.5, 0.0); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLoadIdentity(); glPushMatrix(); // give light its own matrix // Light glTranslatef(0.0, 2.0, 8.0); CreateLight(); glPopMatrix(); glPushMatrix(); // give object its own matrix // Object glRotatef(spin, 0.5, 1.0, 0.0); // show all sides of cube CreateCube(); glPopMatrix(); // DEBUG: CHECK FOR ERRORS GLenum err = glGetError(); if ( err != GL_NO_ERROR ) { fprintf(stderr, "GLGETERROR=%d\n", (int)err); } } }; // Nasty hack to adjust screen bounding box to ignore menu bar space etc. // This ought to be done by querying the platform directly for the actual // screen dimension, but that is platform specific void adjust_w_h(int &w, int &h) { switch(w) { case 1024: h = 768; break; case 1280: h = 1024; break; // etc... } } int main(int argc, char *argv[]) { fl_register_images(); // fltk image lib init // How big is the screen? Note that screen_xywh() returns the "usable" area // and honours the menubars and so forth on most platforms, so will need // to do something platform specific to get the actual size. int sx, sy, sw, sh; Fl::screen_xywh(sx, sy, sw, sh); adjust_w_h(sw, sh); printf("%dx%d %dx%d\n", sx, sy, sw, sh); fflush(stdout); MyGlWindow* mygl = new MyGlWindow(sx, sy, sw, sh, "Textured Image Test"); mygl->clear_border(); if ( argc >= 2 ) { mygl->TextureFilename(argv[1]); } else { printf("Usage: %s <texture_filename.[png,jpg,gif,bmp]>\n" "Texture file should be 64x64, 128x128, etc.\n" "Defaulting to use '%s'\n\n", argv[0], mygl->TextureFilename()); } mygl->show(); return(Fl::run()); } /* end of file */ SELEX Sensors and Airborne Systems Limited Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England & Wales. 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