I have a problem with OpenGL programs using OpenGLUT that are compiled and run in Visual Studio 2012. The program compiles fine and when I press run an 800 x 600 window opens and displays the image that I want. However, the window immediately begins shrinking until it reaches 0 x 0 in about 2 seconds and then stays open. I'm not quite sure what the problem is and Google searches turned up no relevant information. Here are some screenshots of the problem:
The above screenshot was taken immediately after the program started. The below screenshot was taken about a second after the program started without any interaction from me.
The output window continues to shrink until it is 0 x 0 size. Here is my code and any suggestions would be helpful.
#ifdef __APPLE_CC__
#include <GLUT/glut.h>
#else
#include <OpenGlut.h>
#endif
// Clears the window and draws the tetrahedron. The tetrahedron is easily
// specified with a triangle strip, though the specification really isn't very
// easy to read.
void display() {
glClear(GL_COLOR_BUFFER_BIT);
// Draw a white grid "floor" for the tetrahedron to sit on.
glColor3f(1.0, 1.0, 1.0);
glBegin(GL_LINES);
for (GLfloat i = -2.5; i <= 2.5; i += 0.25) {
glVertex3f(i, 0, 2.5); glVertex3f(i, 0, -2.5);
glVertex3f(2.5, 0, i); glVertex3f(-2.5, 0, i);
}
glEnd();
// Draw the tetrahedron. It is a four sided figure, so when defining it
// with a triangle strip we have to repeat the last two vertices.
glBegin(GL_TRIANGLE_STRIP);
glColor3f(1, 1, 1); glVertex3f(0, 2, 0);
glColor3f(1, 0, 0); glVertex3f(-1, 0, 1);
glColor3f(0, 1, 0); glVertex3f(1, 0, 1);
glColor3f(0, 0, 1); glVertex3f(0, 0, -1.4);
glColor3f(1, 1, 1); glVertex3f(0, 2, 0);
glColor3f(1, 0, 0); glVertex3f(-1, 0, 1);
glEnd();
glFlush();
}
// Sets up global attributes like clear color and drawing color, enables and
// initializes any needed modes (in this case we want backfaces culled), and
// sets up the desired projection and modelview matrices. It is cleaner to
// define these operations in a function separate from main().
void init() {
// Set the current clear color to sky blue and the current drawing color to
// white.
glClearColor(0.1, 0.39, 0.88, 1.0);
glColor3f(1.0, 1.0, 1.0);
// Tell the rendering engine not to draw backfaces. Without this code,
// all four faces of the tetrahedron would be drawn and it is possible
// that faces farther away could be drawn after nearer to the viewer.
// Since there is only one closed polyhedron in the whole scene,
// eliminating the drawing of backfaces gives us the realism we need.
// THIS DOES NOT WORK IN GENERAL.
glEnable(GL_CULL_FACE);
glCullFace(GL_BACK);
// Set the camera lens so that we have a perspective viewing volume whose
// horizontal bounds at the near clipping plane are -2..2 and vertical
// bounds are -1.5..1.5. The near clipping plane is 1 unit from the camera
// and the far clipping plane is 40 units away.
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-2, 2, -1.5, 1.5, 1, 40);
// Set up transforms so that the tetrahedron which is defined right at
// the origin will be rotated and moved into the view volume. First we
// rotate 70 degrees around y so we can see a lot of the left side.
// Then we rotate 50 degrees around x to "drop" the top of the pyramid
// down a bit. Then we move the object back 3 units "into the screen".
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0, 0, -3);
glRotatef(50, 1, 0, 0);
glRotatef(70, 0, 1, 0);
}
// Initializes GLUT, the display mode, and main window; registers callbacks;
// does application initialization; enters the main event loop.
int main(int argc, char** argv) {
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
glutInitWindowPosition(80, 80);
glutInitWindowSize(800, 600);
glutCreateWindow("A Simple Tetrahedron");
glutDisplayFunc(display);
init();
glutMainLoop();
}
Probably the best solution - abandon GLUT. I recommend you to use GLFW instead.
GLFW:
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