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/*
* Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee, provided
* that (i) the above copyright notices and this permission notice appear in
* all copies of the software and related documentation, and (ii) the name of
* Silicon Graphics may not be used in any advertising or
* publicity relating to the software without the specific, prior written
* permission of Silicon Graphics.
*
* THE SOFTWARE IS PROVIDED "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 BE LIABLE FOR
* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <GL/glut.h>
#define CI_OFFSET_1 16
#define CI_OFFSET_2 32
GLenum rgb, doubleBuffer;
GLenum antiAlias, stipple;
GLubyte stippleBits[32*4] = {
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
};
#include "tkmap.c"
static void Init(void)
{
GLint i;
glClearColor(0.0, 0.0, 0.0, 0.0);
glClearIndex(0.0);
if (!rgb) {
for (i = 0; i < 16; i++) {
glutSetColor(i+CI_OFFSET_1, 0.0, 0.0, i/15.0);
glutSetColor(i+CI_OFFSET_2, 0.0, i/15.0, 0.0);
}
}
glPolygonStipple(stippleBits);
antiAlias = GL_FALSE;
stipple = GL_FALSE;
}
static void Reshape(int width, int height)
{
glViewport(0, 0, (GLint)width, (GLint)height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
glMatrixMode(GL_MODELVIEW);
}
static void Key(unsigned char key, int x, int y)
{
switch (key) {
case 27:
exit(1);
case '1':
antiAlias = !antiAlias;
break;
case '2':
stipple = !stipple;
break;
default:
return;
}
glutPostRedisplay();
}
static void Draw(void)
{
GLint ci1, ci2;
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
if (antiAlias) {
ci1 = CI_OFFSET_1;
ci2 = CI_OFFSET_2;
glBlendFunc(GL_SRC_ALPHA, GL_ONE);
glEnable(GL_BLEND);
glEnable(GL_POLYGON_SMOOTH);
glDisable(GL_DEPTH_TEST);
} else {
ci1 = COLOR_BLUE;
ci2 = COLOR_GREEN;
glDisable(GL_BLEND);
glDisable(GL_POLYGON_SMOOTH);
glEnable(GL_DEPTH_TEST);
}
if (stipple) {
glEnable(GL_POLYGON_STIPPLE);
} else {
glDisable(GL_POLYGON_STIPPLE);
}
glBegin(GL_TRIANGLES);
(rgb) ? glColor3fv(RGBMap[COLOR_BLUE]) : glIndexi(ci1);
glVertex3f( 0.9, -0.9, -30.0);
glVertex3f( 0.9, 0.9, -30.0);
glVertex3f(-0.9, 0.0, -30.0);
(rgb) ? glColor3fv(RGBMap[COLOR_GREEN]) : glIndexi(ci2);
glVertex3f(-0.9, -0.9, -40.0);
glVertex3f(-0.9, 0.9, -40.0);
glVertex3f( 0.9, 0.0, -25.0);
glEnd();
glFlush();
if (doubleBuffer) {
glutSwapBuffers();
}
}
static GLenum Args(int argc, char **argv)
{
GLint i;
rgb = GL_TRUE;
doubleBuffer = 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 {
printf("%s (Bad option).\n", argv[i]);
return GL_FALSE;
}
}
return GL_TRUE;
}
int main(int argc, char **argv)
{
GLenum type;
glutInit(&argc, argv);
if (Args(argc, argv) == GL_FALSE) {
exit(1);
}
glutInitWindowPosition(0, 0); glutInitWindowSize( 300, 300);
type = GLUT_DEPTH;
type |= (rgb) ? GLUT_RGB : GLUT_INDEX;
type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
glutInitDisplayMode(type);
if (glutCreateWindow("Depth Test") == GL_FALSE) {
exit(1);
}
InitMap();
Init();
glutReshapeFunc(Reshape);
glutKeyboardFunc(Key);
glutDisplayFunc(Draw);
glutMainLoop();
return 0;
}
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