/* Copyright (c) Mark J. Kilgard, 1994. */
/**
* (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* Unpublished-- rights reserved under the copyright laws of the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 <stdlib.h>
#include <math.h>
#include <string.h>
#include <time.h>
#include <GL/glut.h>
#define MAXOBJS 10000
#define MAXSELECT 100
#define MAXFEED 300
#define SOLID 1
#define LINE 2
#define POINT 3
GLint windW = 300, windH = 300;
GLuint selectBuf[MAXSELECT];
GLfloat feedBuf[MAXFEED];
GLint vp[4];
float zRotation = 90.0;
float zoom = 1.0;
GLint objectCount;
GLint numObjects;
struct object {
float v1[2];
float v2[2];
float v3[2];
float color[3];
} objects[MAXOBJS];
GLenum linePoly = GL_FALSE;
static void
InitObjects(GLint num)
{
GLint i;
float x, y;
if (num > MAXOBJS) {
num = MAXOBJS;
}
if (num < 1) {
num = 1;
}
objectCount = num;
srand((unsigned int) time(NULL));
for (i = 0; i < num; i++) {
x = (rand() % 300) - 150;
y = (rand() % 300) - 150;
objects[i].v1[0] = x + (rand() % 50) - 25;
objects[i].v2[0] = x + (rand() % 50) - 25;
objects[i].v3[0] = x + (rand() % 50) - 25;
objects[i].v1[1] = y + (rand() % 50) - 25;
objects[i].v2[1] = y + (rand() % 50) - 25;
objects[i].v3[1] = y + (rand() % 50) - 25;
objects[i].color[0] = ((rand() % 100) + 50) / 150.0;
objects[i].color[1] = ((rand() % 100) + 50) / 150.0;
objects[i].color[2] = ((rand() % 100) + 50) / 150.0;
}
}
static void
Init(void)
{
numObjects = 10;
InitObjects(numObjects);
}
static void
Reshape(int width, int height)
{
windW = width;
windH = height;
glViewport(0, 0, windW, windH);
glGetIntegerv(GL_VIEWPORT, vp);
}
static void
Render(GLenum mode)
{
GLint i;
for (i = 0; i < objectCount; i++) {
if (mode == GL_SELECT) {
glLoadName(i);
}
glColor3fv(objects[i].color);
glBegin(GL_POLYGON);
glVertex2fv(objects[i].v1);
glVertex2fv(objects[i].v2);
glVertex2fv(objects[i].v3);
glEnd();
}
}
static GLint
DoSelect(GLint x, GLint y)
{
GLint hits;
glSelectBuffer(MAXSELECT, selectBuf);
glRenderMode(GL_SELECT);
glInitNames();
glPushName(~0);
glPushMatrix();
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPickMatrix(x, windH - y, 4, 4, vp);
gluOrtho2D(-175, 175, -175, 175);
glMatrixMode(GL_MODELVIEW);
glClearColor(0.0, 0.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
glScalef(zoom, zoom, zoom);
glRotatef(zRotation, 0, 0, 1);
Render(GL_SELECT);
glPopMatrix();
hits = glRenderMode(GL_RENDER);
if (hits <= 0) {
return -1;
}
return selectBuf[(hits - 1) * 4 + 3];
}
static void
RecolorTri(GLint h)
{
objects[h].color[0] = ((rand() % 100) + 50) / 150.0;
objects[h].color[1] = ((rand() % 100) + 50) / 150.0;
objects[h].color[2] = ((rand() % 100) + 50) / 150.0;
}
static void
DeleteTri(GLint h)
{
objects[h] = objects[objectCount - 1];
objectCount--;
}
static void
GrowTri(GLint h)
{
float v[2];
float *oldV;
GLint i;
v[0] = objects[h].v1[0] + objects[h].v2[0] + objects[h].v3[0];
v[1] = objects[h].v1[1] + objects[h].v2[1] + objects[h].v3[1];
v[0] /= 3;
v[1] /= 3;
for (i = 0; i < 3; i++) {
switch (i) {
case 0:
oldV = objects[h].v1;
break;
case 1:
oldV = objects[h].v2;
break;
case 2:
oldV = objects[h].v3;
break;
}
oldV[0] = 1.5 * (oldV[0] - v[0]) + v[0];
oldV[1] = 1.5 * (oldV[1] - v[1]) + v[1];
}
}
static void
Mouse(int button, int state, int mouseX, int mouseY)
{
GLint hit;
if (state == GLUT_DOWN) {
hit = DoSelect((GLint) mouseX, (GLint) mouseY);
if (hit != -1) {
if (button == GLUT_LEFT_BUTTON) {
RecolorTri(hit);
} else if (button == GLUT_MIDDLE_BUTTON) {
GrowTri(hit);
} else if (button == GLUT_RIGHT_BUTTON) {
DeleteTri(hit);
}
glutPostRedisplay();
}
}
}
static void
Draw(void)
{
glPushMatrix();
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(-175, 175, -175, 175);
glMatrixMode(GL_MODELVIEW);
glClearColor(0.0, 0.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
glScalef(zoom, zoom, zoom);
glRotatef(zRotation, 0, 0, 1);
Render(GL_RENDER);
glPopMatrix();
glutSwapBuffers();
}
static void
DumpFeedbackVert(GLint * i, GLint n)
{
GLint index;
index = *i;
if (index + 7 > n) {
*i = n;
printf(" ???\n");
return;
}
printf(" (%g %g %g), color = (%4.2f %4.2f %4.2f)\n",
feedBuf[index],
feedBuf[index + 1],
feedBuf[index + 2],
feedBuf[index + 3],
feedBuf[index + 4],
feedBuf[index + 5]);
index += 7;
*i = index;
}
static void
DrawFeedback(GLint n)
{
GLint i;
GLint verts;
printf("Feedback results (%d floats):\n", n);
for (i = 0; i < n; i++) {
switch ((GLint) feedBuf[i]) {
case GL_POLYGON_TOKEN:
printf("Polygon");
i++;
if (i < n) {
verts = (GLint) feedBuf[i];
i++;
printf(": %d vertices", verts);
} else {
verts = 0;
}
printf("\n");
while (verts) {
DumpFeedbackVert(&i, n);
verts--;
}
i--;
break;
case GL_LINE_TOKEN:
printf("Line:\n");
i++;
DumpFeedbackVert(&i, n);
DumpFeedbackVert(&i, n);
i--;
break;
case GL_LINE_RESET_TOKEN:
printf("Line Reset:\n");
i++;
DumpFeedbackVert(&i, n);
DumpFeedbackVert(&i, n);
i--;
break;
default:
printf("%9.2f\n", feedBuf[i]);
break;
}
}
if (i == MAXFEED) {
printf("...\n");
}
printf("\n");
}
static void
DoFeedback(void)
{
GLint x;
glFeedbackBuffer(MAXFEED, GL_3D_COLOR, feedBuf);
(void) glRenderMode(GL_FEEDBACK);
glPushMatrix();
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(-175, 175, -175, 175);
glMatrixMode(GL_MODELVIEW);
glClearColor(0.0, 0.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
glScalef(zoom, zoom, zoom);
glRotatef(zRotation, 0, 0, 1);
Render(GL_FEEDBACK);
glPopMatrix();
x = glRenderMode(GL_RENDER);
if (x == -1) {
x = MAXFEED;
}
DrawFeedback((GLint) x);
}
/* ARGSUSED1 */
static void
Key(unsigned char key, int x, int y)
{
switch (key) {
case 'z':
zoom /= 0.75;
glutPostRedisplay();
break;
case 'Z':
zoom *= 0.75;
glutPostRedisplay();
break;
case 'f':
DoFeedback();
glutPostRedisplay();
break;
case 'l':
linePoly = !linePoly;
if (linePoly) {
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
} else {
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
}
glutPostRedisplay();
break;
case 27:
exit(0);
}
}
/* ARGSUSED1 */
static void
SpecialKey(int key, int x, int y)
{
switch (key) {
case GLUT_KEY_LEFT:
zRotation += 0.5;
glutPostRedisplay();
break;
case GLUT_KEY_RIGHT:
zRotation -= 0.5;
glutPostRedisplay();
break;
}
}
int
main(int argc, char **argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
glutCreateWindow("Select Test");
Init();
glutReshapeFunc(Reshape);
glutKeyboardFunc(Key);
glutSpecialFunc(SpecialKey);
glutMouseFunc(Mouse);
glutDisplayFunc(Draw);
glutMainLoop();
return 0; /* ANSI C requires main to return int. */
}