/*
 * (c) Copyright 1993, Silicon Graphics, Inc.
 * ALL RIGHTS RESERVED 
 * Permission to use, copy, modify, and distribute this software for 
 * any purpose and without fee is hereby granted, provided that the above
 * copyright notice appear in all copies and that both the copyright notice
 * and this permission notice appear in supporting documentation, and that 
 * the name of Silicon Graphics, Inc. not be used in advertising
 * or publicity pertaining to distribution of the software without specific,
 * written prior permission. 
 *
 * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
 * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
 * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
 * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
 * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
 * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
 * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
 * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
 * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
 * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
 * 
 * US Government Users Restricted Rights 
 * Use, duplication, or disclosure by the Government is subject to
 * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
 * (c)(1)(ii) of the Rights in Technical Data and Computer Software
 * clause at DFARS 252.227-7013 and/or in similar or successor
 * clauses in the FAR or the DOD or NASA FAR Supplement.
 * Unpublished-- rights reserved under the copyright laws of the
 * United States.  Contractor/manufacturer is Silicon Graphics,
 * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
 *
 * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
 */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "tk.h"


#define CI_RED TK_RED
#define CI_ANTI_ALIAS_GREEN 16
#define CI_ANTI_ALIAS_YELLOW 32
#define CI_ANTI_ALIAS_RED 48


GLenum rgb, doubleBuffer, directRender, windType;
GLint windW, windH;

GLenum mode;
GLint size;
float point[3] = {
    1.0, 1.0, 0.0
};


static void Init(void)
{
    GLint i;

    glClearColor(0.0, 0.0, 0.0, 0.0);

    glBlendFunc(GL_SRC_ALPHA, GL_ZERO);

    if (!rgb) {
	for (i = 0; i < 16; i++) {
	    tkSetOneColor(i+CI_ANTI_ALIAS_RED, i/15.0, 0.0, 0.0);
	    tkSetOneColor(i+CI_ANTI_ALIAS_YELLOW, i/15.0, i/15.0, 0.0);
	    tkSetOneColor(i+CI_ANTI_ALIAS_GREEN, 0.0, i/15.0, 0.0);
	}
    }

    mode = GL_FALSE;
    size = 1;
}

static void Reshape(int width, int height)
{

    windW = (GLint)width;
    windH = (GLint)height;

    glViewport(0, 0, width, height);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(-windW/2, windW/2, -windH/2, windH/2);
    glMatrixMode(GL_MODELVIEW);
}

static GLenum Key(int key, GLenum mask)
{

    switch (key) {
      case TK_ESCAPE:
	tkQuit();
      case TK_1:
	mode = !mode;
	break;
      case TK_W:
	size++;
	break;
      case TK_w:
	size--;
	if (size < 1) {
	    size = 1;
	}
	break;
      case TK_LEFT:
	point[0] -= 0.25;
	break;
      case TK_RIGHT:
	point[0] += 0.25;
	break;
      case TK_UP:
	point[1] += 0.25;
	break;
      case TK_DOWN:
	point[1] -= 0.25;
	break;
      default:
	return GL_FALSE;
    }
    return GL_TRUE;
}

static void Draw(void)
{

    glClear(GL_COLOR_BUFFER_BIT);

    TK_SETCOLOR(windType, TK_YELLOW);
    glBegin(GL_LINE_STRIP);
	glVertex2f(-windW/2, 0);
	glVertex2f(windW/2, 0);
    glEnd();
    glBegin(GL_LINE_STRIP);
	glVertex2f(0, -windH/2);
	glVertex2f(0, windH/2);
    glEnd();

    if (mode) {
	glEnable(GL_BLEND);
	glEnable(GL_POINT_SMOOTH);
    } else {
	glDisable(GL_BLEND);
	glDisable(GL_POINT_SMOOTH);
    }

    glPointSize(size);
    if (mode) {
	(rgb) ? glColor3f(1.0, 0.0, 0.0) : glIndexf(CI_ANTI_ALIAS_RED);
    } else {
	(rgb) ? glColor3f(1.0, 0.0, 0.0) : glIndexf(CI_RED);
    }
    glBegin(GL_POINTS);
	glVertex3fv(point);
    glEnd();

    glDisable(GL_POINT_SMOOTH);

    glPointSize(1);
    TK_SETCOLOR(windType, TK_GREEN);
    glBegin(GL_POINTS);
	glVertex3fv(point);
    glEnd();

    glFlush();

    if (doubleBuffer) {
	tkSwapBuffers();
    }
}

static GLenum Args(int argc, char **argv)
{
    GLint i;

    rgb = GL_TRUE;
    doubleBuffer = GL_FALSE;
    directRender = GL_FALSE;

    for (i = 1; i < argc; i++) {
	if (strcmp(argv[i], "-ci") == 0) {
	    rgb = GL_FALSE;
	} else if (strcmp(argv[i], "-rgb") == 0) {
	    rgb = GL_TRUE;
	} else if (strcmp(argv[i], "-sb") == 0) {
	    doubleBuffer = GL_FALSE;
	} else if (strcmp(argv[i], "-db") == 0) {
	    doubleBuffer = GL_TRUE;
	} else if (strcmp(argv[i], "-dr") == 0) {
	    directRender = GL_TRUE;
	} else if (strcmp(argv[i], "-ir") == 0) {
	    directRender = GL_FALSE;
	} else {
	    printf("%s (Bad option).\n", argv[i]);
	    return GL_FALSE;
	}
    }
    return GL_TRUE;
}

void main(int argc, char **argv)
{

    if (Args(argc, argv) == GL_FALSE) {
	tkQuit();
    }

    windW = 300;
    windH = 300;
    tkInitPosition(0, 0, windW, windH);

    windType = (rgb) ? TK_RGB : TK_INDEX;
    windType |= (doubleBuffer) ? TK_DOUBLE : TK_SINGLE;
    windType |= (directRender) ? TK_DIRECT : TK_INDIRECT;
    tkInitDisplayMode(windType);

    if (tkInitWindow("Point Test") == GL_FALSE) {
	tkQuit();
    }

    Init();

    tkExposeFunc(Reshape);
    tkReshapeFunc(Reshape);
    tkKeyDownFunc(Key);
    tkDisplayFunc(Draw);
    tkExec();
}