GLUT

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1 개요

OpenGL Utility Toolkit

2 가장 기본적인 렌더링

http://www.lighthouse3d.com/opengl/glut/ 에서 가져와서 정리한 것.


#include <glut.h> 

#pragma comment(lib, "glut32.lib")

float angle=0.0f;

void OnIdle(void) 
{
    // notice that we're now clearing the depth buffer 
    // as well this is required, otherwise the depth buffer 
    // gets filled and nothing gets rendered. 
    // Try it out, remove the depth buffer part.
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    
    // save the previous settings, in this case save 
    // we're refering to the camera settings.
    glPushMatrix();
    
    // Perform a rotation around the y axis (0,1,0) 
    // by the amount of degrees defined in the variable angle
    glRotatef(angle,0.0,1.0,0.0);
    glBegin(GL_TRIANGLES);
        glVertex3f(-0.5,-0.5,0.0);
        glVertex3f(0.5,0.0,0.0);
        glVertex3f(0.0,0.5,0.0);
    glEnd();
    
    // discard the modelling transformations
    // after this the matrix will have only the camera settings.
    glPopMatrix();
    
    // swapping the buffers causes the rendering above to be 
    // shown
    glutSwapBuffers();
    
    // finally increase the angle for the next frame
    angle += 1.0f;
}

void OnResize(int w, int h) 
{
    // Prevent a divide by zero, when window is too short
    // (you cant make a window of zero width).
    if(h == 0)
        h = 1;

    float ratio = 1.0* w / h;

    // Reset the coordinate system before modifying
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    
    // Set the viewport to be the entire window
    glViewport(0, 0, w, h);

    // Set the correct perspective.
    gluPerspective(45, ratio, 1, 1000);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    gluLookAt(0.0,0.0,5.0, 
              0.0,0.0,-1.0,
              0.0f,1.0f,0.0f);
}

int main(int argc, char** argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);
    glutInitWindowPosition(100, 100);
    glutInitWindowSize(320, 320);
    glutCreateWindow("3D Tech- GLUT Tutorial");
    glutIdleFunc(OnIdle);
    glutDisplayFunc(OnIdle);
    glutReshapeFunc(OnResize);
    glEnable(GL_DEPTH_TEST);
    glutMainLoop();
    return 0;
}

3 링크

• http://www.xmission.com/~nate/glut.html
  
GLUT for Win32

• GLUT Tutorial
  

• see also OpenGl
  

• CategoryGraphicProgramming