#include "GL/freeglut.h"
void init()
{
	//selecteaza culoarea de fond
	glClearColor(1, 1, 1, 1);
	//glShadeModel(GL_FLAT); //
}
void triangle()
{
	// se va folosi glBegin() cu parametrul corespunzator pentru
	//desenarea triunghiului

	glBegin(GL_TRIANGLES); //Begin triangle coordinates
	//Triangle
		glColor3f(1.0f,0.0f,0.0f);glVertex3f(0.0f, 0.0f, 1.0f);
		glColor3f(0.0f,1.0f, 0.0f);glVertex3f(0.0f, 1.0f, 0.0f);
		glColor3f(0.0f, 0.0f, 1.0f);glVertex3f(1.0f, 0.0f, 0.0f);
	glEnd(); //End triangle coordinates

}
void display()
{
	glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
	triangle();
	glutSwapBuffers();
}
void reshape(int w, int h)
{
	glViewport(0, 0, (GLsizei)w, (GLsizei)h);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	if (w <= h)
		gluOrtho2D(0, 30, 0, 30 * (GLfloat)h / (GLfloat)w);
	else
		gluOrtho2D(0, 30 * (GLfloat)w / (GLfloat)h, 0, 30);
	glMatrixMode(GL_MODELVIEW);
}
int main(int argc, char **argv)
{
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE|GLUT_DEPTH);
	glutInitWindowPosition(100, 100);
	glutInitWindowSize(640, 480);
	glutCreateWindow("SPG OpenGL");
	init();
	glutDisplayFunc(display);
	//glutReshapeFunc(reshape);
	glutMainLoop();
	return 0;
}