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/*
* Copyright (C) 2003 Holmes Futrell <holmes@neatosoftware.com>
* Ported to Linux by Tugrul Galatali <tugrul@galatali.com>
*
* SpirographX is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* SpirographX is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
// SpirographX screen saver
#include "driver.h"
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include "rsDefines.h"
#include "rsRand.h"
#include "rsMath/rsTrigonometry.h"
const char *hack_name = "SpirographX";
#define MAXSUBLOOPS 5
#define MAXDETAIL 100
float equationBase;
float speed;
int graphTo;
int SUBLOOPS;
int DETAIL;
int blurWidth;
float blurAlpha;
float lineAlpha;
int animated;
int timeInterval;
float points[2 * 360 * MAXSUBLOOPS * MAXDETAIL];
int colorBits, depthBits;
int runningFullScreen;
float lineColor[3];
float blurColor[3];
void changeSettings ()
{
do {
equationBase = rsRandf (10) - 5;
} while (equationBase <= 2 && equationBase >= -2); // we don't want between 1 and -1
blurColor[0] = rsRandi (100) / 50.0;
blurColor[1] = rsRandi (100) / 50.0;
blurColor[2] = rsRandi (100) / 50.0;
lineColor[0] = rsRandi (100) / 50.0;
lineColor[1] = rsRandi (100) / 50.0;
lineColor[2] = rsRandi (100) / 50.0;
SUBLOOPS = rsRandi (3) + 2;
graphTo = rsRandi (16) + 15;
speed = (rsRandi (225) + 75) / 1000000.0;
if (rsRandi (2) == 1) {
speed *= -1;
}
}
void getAll ()
{
int m, n;
float poweranswer[SUBLOOPS];
poweranswer[0] = 1;
for (n = 1; n < SUBLOOPS; n++) {
poweranswer[n] = poweranswer[n - 1] * equationBase;
}
const int numberOfPoints = 2 * PI * graphTo * DETAIL;
memset(points, 0, numberOfPoints * 2 * sizeof(float));
for (m = 0; m < numberOfPoints; m++) {
const float moverd = (float)m / DETAIL;
for (n = 0; n < SUBLOOPS; n++) {
const float pointpoweroverdetail = moverd * poweranswer[n];
float sinppod, cosppod;
rsSinCosf(fmod(pointpoweroverdetail, RS_SINCOS_MAX), &sinppod, &cosppod);
points[2 * m + 0] += cosppod / poweranswer[n];
points[2 * m + 1] += sinppod / poweranswer[n];
}
}
}
void drawAll ()
{
const int numberOfPoints = 2 * PI * graphTo * DETAIL;
glDrawArrays(GL_LINE_STRIP, 0, numberOfPoints);
}
void hack_reshape (xstuff_t * XStuff)
{
glViewport (0, 0, (GLsizei) XStuff->windowWidth, (GLsizei) XStuff->windowHeight);
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();
gluPerspective (45.0f, (GLfloat) XStuff->windowWidth / (GLfloat) XStuff->windowHeight, 0.1f, 100.0f);
glMatrixMode (GL_MODELVIEW);
glLoadIdentity ();
}
void hack_init (xstuff_t * XStuff) // Called right after the window is created, and OpenGL is initialized.
{
rsSinCosInit();
blurWidth = 5;
glVertexPointer(2, GL_FLOAT, 0, points);
glEnableClientState(GL_VERTEX_ARRAY);
glClearColor (0.0f, 0.0f, 0.0f, 0.5f);
glClearDepth (1.0f);
glEnable (GL_BLEND);
glEnable (GL_LINE_SMOOTH);
glBlendFunc (GL_SRC_ALPHA, GL_ONE);
glLoadIdentity ();
changeSettings ();
hack_reshape (XStuff);
}
void hack_cleanup (xstuff_t * XStuff)
{
}
void hack_draw (xstuff_t * XStuff, double currentTime, float frameTime)
{
static double lastSettingsChange = -1;
if (lastSettingsChange == -1)
lastSettingsChange = currentTime;
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity ();
getAll ();
glTranslatef(0.0, 0.0, -3.0f);
glLineWidth (blurWidth * sqrt((GLfloat) (XStuff->windowWidth * XStuff->windowHeight) / (500 * 400)));
glColor4f (blurColor[0], blurColor[1], blurColor[2], 0.2);
drawAll ();
glLineWidth(1);
glColor4f (lineColor[0], lineColor[1], lineColor[2], 0.4);
drawAll ();
if (currentTime - lastSettingsChange > timeInterval) {
lastSettingsChange = currentTime;
changeSettings ();
}
equationBase += speed * (frameTime / (1.0 / 30.0));
glFlush ();
}
void hack_handle_opts (int argc, char **argv)
{
timeInterval = 15;
DETAIL = 45;
while (1) {
int c;
#ifdef HAVE_GETOPT_H
static struct option long_options[] = {
{"help", 0, 0, 'h'},
DRIVER_OPTIONS_LONG {"detail", 1, 0, 'd'},
{"interval", 1, 0, 'i'},
{0, 0, 0, 0}
};
c = getopt_long (argc, argv, DRIVER_OPTIONS_SHORT "hd:i:", long_options, NULL);
#else
c = getopt (argc, argv, DRIVER_OPTIONS_SHORT "hd:i:");
#endif
if (c == -1)
break;
switch (c) {
DRIVER_OPTIONS_CASES case 'h':printf ("%s:"
#ifndef HAVE_GETOPT_H
" Not built with GNU getopt.h, long options *NOT* enabled."
#endif
"\n" DRIVER_OPTIONS_HELP "\t--detail/-d <arg>\n" "\t--interval/-i <arg>\n", argv[0]);
exit (1);
case 'd':
DETAIL = strtol_minmaxdef (optarg, 10, 10, MAXDETAIL, 1, 45, "--detail: ");
break;
case 'i':
timeInterval = strtol_minmaxdef (optarg, 10, 5, 120, 1, 15, "--interval: ");
}
}
}
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