#include <stdlib.h>
#include <string.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

static GLfloat vbuf[] = {X1, Y1, 0, X1, Y2, 0, X2, Y2, 0, X2, Y1, 0};

void 
display_normal(void)
{
        GLuint lid;
        GLubyte bitmap[128];
        int i;

        for (i = 0; i < sizeof(bitmap) / sizeof(GLubyte); i++)
                bitmap[i] = 0xff;

        glClear(GL_COLOR_BUFFER_BIT);
        glColor3f (0.0, 0.0, 1.0);
        glPixelStorei(GL_UNPACK_LSB_FIRST, GL_FALSE);
        glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
        glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
        glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
        glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_TRUE);

        lid = glGenLists(1);
        glNewList(lid, GL_COMPILE);
        glDrawPixels(32, 32, GL_COLOR_INDEX, GL_BITMAP, bitmap);
        glEndList();
        glCallList(lid);
        glDeleteLists(lid, 1);

        glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_FALSE);
        glFlush();
}

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();
        glRasterPos2f(10, 10);
}

static void init()
{
        glDisable(GL_DITHER);
        glClearColor(1, 1, 0, 1);
        glBlendFunc(GL_SRC_ALPHA, GL_ZERO);
}

int 
main(int argc, char** argv)
{
        glutInit(&argc, argv);
        glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
        glutInitWindowSize(250, 250);
        glutInitWindowPosition(100, 100);
        glutCreateWindow("DrawPixels");
        init();
        glutReshapeFunc(reshape);
        glutDisplayFunc(display);
        glutKeyboardFunc(key);
        glutMainLoop();
        return 0;
}