91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
#include <glut.h>
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int width = 800;
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int height = 600;
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void init(int argc, char** argv) {
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glutInit(&argc, argv);
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glutInitDisplayMode(GLUT_SINGLE);
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glutInitWindowSize(width, height);
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glutInitWindowPosition(100, 100);
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glViewport(0,0,width,height);
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glutCreateWindow("Culling");
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glMatrixMode(GL_MODELVIEW);
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glOrtho(-2.0, 2.0,-2.0, 2.0, -2.0, 2.0);
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gluLookAt(0.25,0.5,0.1,0,0,0,0,1,0);
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////////////////////////////////////////////////////////////////////
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glEnable(GL_CULL_FACE);
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glCullFace(GL_FRONT);
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////////////////////////////////////////////////////////////////////
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}
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void display(void)
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{
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glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glEnable(GL_DEPTH_TEST);
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glDepthFunc(GL_LEQUAL);
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glBegin(GL_QUADS);
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glColor3f(1.0f, 0.0f, 0.0f);
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// FRONT
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glVertex3f(-0.5f, -0.5f, 0.5f);
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glVertex3f( 0.5f, -0.5f, 0.5f);
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glVertex3f( 0.5f, 0.5f, 0.5f);
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glVertex3f(-0.5f, 0.5f, 0.5f);
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// BACK
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glVertex3f(-0.5f, -0.5f, -0.5f);
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glVertex3f(-0.5f, 0.5f, -0.5f);
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glVertex3f( 0.5f, 0.5f, -0.5f);
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glVertex3f( 0.5f, -0.5f, -0.5f);
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glColor3f(0.0f, 1.0f, 0.0f);
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// LEFT
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glVertex3f(-0.5f, -0.5f, 0.5f);
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glVertex3f(-0.5f, 0.5f, 0.5f);
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glVertex3f(-0.5f, 0.5f, -0.5f);
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glVertex3f(-0.5f, -0.5f, -0.5f);
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// RIGHT
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glVertex3f( 0.5f, -0.5f, -0.5f);
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glVertex3f( 0.5f, 0.5f, -0.5f);
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glVertex3f( 0.5f, 0.5f, 0.5f);
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glVertex3f( 0.5f, -0.5f, 0.5f);
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glColor3f(0.0f, 0.0f, 1.0f);
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// BOTTOM
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// glVertex3f(-0.5f, -0.5f, 0.5f);
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// glVertex3f(-0.5f, -0.5f, -0.5f);
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// glVertex3f( 0.5f, -0.5f, -0.5f);
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// glVertex3f( 0.5f, -0.5f, 0.5f);
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// to turn around the bottom orientation: define points in different order
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// glVertex3f( 0.5f, -0.5f, 0.5f);
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// glVertex3f( 0.5f, -0.5f, -0.5f);
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// glVertex3f(-0.5f, -0.5f, -0.5f);
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// glVertex3f(-0.5f, -0.5f, 0.5f);
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glEnd();
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glFlush();
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}
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int main(int argc, char** argv)
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{
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init(argc, argv);
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glutDisplayFunc(display);
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glutMainLoop();
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return 0;
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}
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