john7rv

glEnableClientState( GL_COLOR_ARRAY );

glColorPointer( 3, GL_FLOAT, 0, col );

#include <GL/glut.h>   
#include <GL/gl.h>	
#include <GL/glu.h>	

const GLfloat vx[] = {
	-1,0,0, 0,1,0, 1,0,0
};
const GLubyte ix[] = { 
	0 , 1 , 2 
};

const GLfloat col[] = {
    1.0, 0.0, 0.0,    0.0, 1.0, 0.0,    0.0, 0.0, 1.0
};
   
void display()
{
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glLoadIdentity();
	glTranslatef(0,0,-5);
	
	//glColor3f(0,0,1);
	/*
	glBegin(GL_TRIANGLES);
		glVertex3f(-1,0,0);
		glVertex3f(0, 1,0);
		glVertex3f( 1,0,0);
	glEnd();
	*/
	glEnableClientState(GL_VERTEX_ARRAY);
	glEnableClientState( GL_COLOR_ARRAY );
	glVertexPointer(3 , GL_FLOAT , 0 , vx);
	glColorPointer( 3, GL_FLOAT, 0, col );

	glDrawElements(GL_TRIANGLES , 3 , GL_UNSIGNED_BYTE , ix);
	glutSwapBuffers();
}

void onKeyboard(unsigned char key, int x, int y)
{
	switch (key) {
		case '\033':   
			exit(0);
		default:
			break;
}
}

void onMouse(int button, int state, int x, int y)
{
	switch (button) {
		case GLUT_LEFT_BUTTON:
			break;
		case GLUT_MIDDLE_BUTTON:
			break;
		case GLUT_RIGHT_BUTTON:
			break;
		default:
			break;
	}
}


void onReshape(int width, int height)
{
	if (height==0) height=1;
	if (width==0) width=1;
	glViewport(0,0,width,height);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(45.0f,(GLfloat)width/(GLfloat)height,0.1f,100.0f);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
}

void timer(int value)
{
	glutPostRedisplay();
	glutTimerFunc(30 , timer , 0);
}

void glInit(void)
{
	glClearColor(0.9, 0.9, 0.9, 1.0);
	glShadeModel(GL_SMOOTH);
	glClearDepth(1.0f);
	glEnable(GL_DEPTH_TEST);
	glDepthFunc(GL_LEQUAL);
	glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
}

int main(int argc, char **argv) 
{  
	glutInit(&argc, argv);  
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH);  
	glutInitWindowSize(750,750);  
 
	int window = glutCreateWindow(argv[0]);
	glutDisplayFunc(display);
	glutReshapeFunc(onReshape);
	glutMouseFunc(onMouse);
	glutKeyboardFunc(onKeyboard);
	glutTimerFunc(50 , timer , 0);
	glInit();
	glutMainLoop();  
	return 1;
}