/*
 * A test case to demonstrate Mesa bug 9134.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <assert.h>
#include <GL/glut.h>

#define X1  -1.0
#define X2  1.0
#define Y1  -1.0
#define Y2  1.0

#define display display_normal

#define POW(x, y) (float)pow((double)(x), (double)(y))
#define ABS(x) (((x) < 0.0) ? -(x) : (x))

#define ZERO 1.0 / POW(2.0, 13.0)

void 
display_normal(void)
{
        GLuint lid;
        GLfloat buf[100];
        memset(buf, 0, sizeof(buf));

        glClear(GL_COLOR_BUFFER_BIT);
        glColor3f (1.0, 0.0, 0.0);

        lid = glGenLists(1);
        glNewList(lid, GL_COMPILE_AND_EXECUTE);
        glPolygonMode (GL_FRONT_AND_BACK, GL_POINT);
        glBegin(GL_TRIANGLES);
        glEdgeFlag (GL_TRUE);
        glVertex2f(10.0, 10.0);
        glVertex2f(50.0, 30.0);
        glEdgeFlag (GL_FALSE);
        glVertex2f(100.0, 10.0);
        glEnd();
        glFlush();
        glEndList();

        glDeleteLists(lid, 1);

        glReadPixels(10, 10, 1, 1, GL_RGB, GL_FLOAT, (GLvoid *)buf);

        if (ABS(buf[0] - 1.0) > ZERO || 
            ABS(buf[1]) > ZERO ||
            ABS(buf[2]) > ZERO) {
                assert(0);
        }
}

static void
key(unsigned char k, int x, int y)
{
        switch (k) {
        case 27:
                exit(0);
                break;
        default:
                return;
        }
        glutPostRedisplay();
}


static void 
reshape(int width, int height)
{
        glViewport(0, 0, width, height);
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        gluOrtho2D (0, width, 0, height);
        glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();
}

int 
main(int argc, char** argv)
{
        glutInit(&argc, argv);
        glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
        glutInitWindowSize(200, 200);
        glutInitWindowPosition(100, 100);
        glutCreateWindow("Vertex");
        glutReshapeFunc(reshape);
        glutDisplayFunc(display);
        glutKeyboardFunc(key);
        glutMainLoop();
        return 0;
}