Window C - GLFW not opening on Debian

Question

I'm trying to get started with GLFW on Debian, I tried to compile and run the sample program, but it refuses to start. With a few printf instructions, I found that when a program tries to open a GLFW window, it fails and then exits, but I don’t know why. Any help would be awesome.

#include <stdlib.h> // For malloc() etc. #include <stdio.h> // For printf(), fopen() etc. #include <math.h> // For sin(), cos() etc. #include <GL/glfw.h> // For GLFW, OpenGL and GLU //---------------------------------------------------------------------- // Draw() - Main OpenGL drawing function that is called each frame //---------------------------------------------------------------------- void Draw( void ) { int width, height; // Window dimensions double t; // Time (in seconds) int k; // Loop counter // Get current time t = glfwGetTime(); // Get window size glfwGetWindowSize( &width, &height ); // Make sure that height is non-zero to avoid division by zero height = height < 1 ? 1 : height; // Set viewport glViewport( 0, 0, width, height ); // Clear color and depht buffers glClearColor( 0.0f, 0.0f, 0.0f, 0.0f ); glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); // Set up projection matrix glMatrixMode( GL_PROJECTION ); // Select projection matrix glLoadIdentity(); // Start with an identity matrix gluPerspective( // Set perspective view 65.0, // Field of view = 65 degrees (double)width/(double)height, // Window aspect (assumes square pixels) 1.0, // Near Z clipping plane 100.0 // Far Z clippling plane ); // Set up modelview matrix glMatrixMode( GL_MODELVIEW ); // Select modelview matrix glLoadIdentity(); // Start with an identity matrix gluLookAt( // Set camera position and orientation 0.0, 0.0, 10.0, // Camera position (x,y,z) 0.0, 0.0, 0.0, // View point (x,y,z) 0.0, 1.0, 0.0 // Up-vector (x,y,z) ); // **** Draw a circle of points *** // Save the current modelview matrix on the stack glPushMatrix(); // Translate (move) the points to the upper left of the display glTranslatef( -4.0f, 3.0f, 0.0f ); // Rotate the points about the z-axis and the x-axis glRotatef( 35.0f * (float)t, 0.0f, 0.0f, 1.0f ); glRotatef( 60.0f * (float)t, 1.0f, 0.0f, 0.0f ); // Now draw the points - we use a for-loop to build a circle glColor3f( 1.0f, 1.0f, 1.0f ); glBegin( GL_POINTS ); for( k = 0; k < 20; k ++ ) { glVertex3f( 2.0f * (float)cos( 0.31416 * (double)k ), 2.0f * (float)sin( 0.31416 * (double)k ), 0.0f ); } glEnd(); // Restore modelview matrix glPopMatrix(); // **** Draw a circle of lines *** // Save the current modelview matrix on the stack glPushMatrix(); // Translate (move) the lines to the upper right of the display glTranslatef( 4.0f, 3.0f, 0.0f ); // Rotate the points about the z-axis and the x-axis glRotatef( 45.0f * (float)t, 0.0f, 0.0f, 1.0f ); glRotatef( 55.0f * (float)t, 1.0f, 0.0f, 0.0f ); // Now draw the lines - we use a for-loop to build a circle glBegin( GL_LINE_LOOP ); for( k = 0; k < 20; k ++ ) { glColor3f( 1.0f, 0.05f * (float)k, 0.0f ); glVertex3f( 2.0f * (float)cos( 0.31416 * (double)k ), 2.0f * (float)sin( 0.31416 * (double)k ), 0.0f ); } glEnd(); // Restore modelview matrix glPopMatrix(); // **** Draw a disc using trinagles *** // Save the current modelview matrix on the stack glPushMatrix(); // Translate (move) the triangles to the lower left of the display glTranslatef( -4.0f, -3.0f, 0.0f ); // Rotate the triangles about the z-axis and the x-axis glRotatef( 25.0f * (float)t, 0.0f, 0.0f, 1.0f ); glRotatef( 75.0f * (float)t, 1.0f, 0.0f, 0.0f ); // Now draw the triangles - we use a for-loop to build a disc // Since we are building a triangle fan, we also specify a first // vertex for the centre point of the disc. glBegin( GL_TRIANGLE_FAN ); glColor3f( 0.0f, 0.5f, 1.0f ); glVertex3f( 0.0f, 0.0f, 0.0f ); for( k = 0; k < 21; k ++ ) { glColor3f( 0.0f, 0.05f * (float)k, 1.0f ); glVertex3f( 2.0f * (float)cos( 0.31416 * (double)k ), 2.0f * (float)sin( 0.31416 * (double)k ), 0.0f ); } glEnd(); // Restore modelview matrix glPopMatrix(); // **** Draw a disc using a polygon *** // Save the current modelview matrix on the stack glPushMatrix(); // Translate (move) the polygon to the lower right of the display glTranslatef( 4.0f, -3.0f, 0.0f ); // Rotate the polygon about the z-axis and the x-axis glRotatef( 65.0f * (float)t, 0.0f, 0.0f, 1.0f ); glRotatef( -35.0f * (float)t, 1.0f, 0.0f, 0.0f ); // Now draw the polygon - we use a for-loop to build a disc glBegin( GL_POLYGON ); for( k = 0; k < 20; k ++ ) { glColor3f( 1.0f, 0.0f, 0.05f * (float)k ); glVertex3f( 2.0f * (float)cos( 0.31416 * (double)k ), 2.0f * (float)sin( 0.31416 * (double)k ), 0.0f ); } glEnd(); // Restore modelview matrix glPopMatrix(); // **** Draw a single quad *** // Save the current modelview matrix on the stack glPushMatrix(); // Rotate the quad about the y-axis glRotatef( 60.0f * (float)t, 0.0f, 1.0f, 0.0f ); // Now draw the quad glBegin( GL_QUADS ); glColor3f( 1.0f, 0.0f, 0.0f ); glVertex3f( -1.5f, -1.5f, 0.0f ); glColor3f( 1.0f, 1.0f, 0.0f ); glVertex3f( 1.5f, -1.5f, 0.0f ); glColor3f( 1.0f, 0.0f, 1.0f ); glVertex3f( 1.5f, 1.5f, 0.0f ); glColor3f( 0.0f, 0.0f, 1.0f ); glVertex3f( -1.5f, 1.5f, 0.0f ); glEnd(); // Restore modelview matrix glPopMatrix(); } //---------------------------------------------------------------------- // main() - Program entry point //---------------------------------------------------------------------- int main( int argc, char **argv ) { int ok; // Flag telling if the window was opened int running; // Flag telling if the program is running // Initialize GLFW glfwInit(); // Open window ok = glfwOpenWindow( 100, 100, // Width and height of window 8, 8, 8, // Number of red, green, and blue bits for color buffer 8, // Number of bits for alpha buffer 24, // Number of bits for depth buffer (Z-buffer) 0, // Number of bits for stencil buffer GLFW_WINDOW // We want a desktop window (could be GLFW_FULLSCREEN) ); printf("here"); // If we could not open a window, exit now if( !ok ) { glfwTerminate(); return 0; } printf("not here"); // Set window title glfwSetWindowTitle( "My OpenGL program" ); // Enable sticky keys glfwEnable( GLFW_STICKY_KEYS ); // Main rendering loop do { // Call our rendering function Draw(); // Swap front and back buffers (we use a double buffered display) glfwSwapBuffers(); // Check if the escape key was pressed, or if the window was closed running = !glfwGetKey( GLFW_KEY_ESC ) && glfwGetWindowParam( GLFW_OPENED ); } while( running ); // Terminate GLFW glfwTerminate(); // Exit program return 0; } 

Answer 1

Are you sure this is glfwOpenWindow error? I don’t know why this is possible, maybe you are using too many bits for your z-buffer? This is the only thing I can think of.

try it

 GLFWvidmode dvm; glfwGetDesktopMode(&dvm); glfwOpenWindow(winWidth, winHeight, dvm.RedBits, dvm.GreenBits, dvm.BlueBits, 0, 0, 0, GLFW_WINDOW); 

And let's see, it still fails.