/* energystream, Copyright (c) 2016 Eugene Sandulenko <sev@scummvm.org>
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation. No representations are made about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*
* Based on Public Domain code by konrad "yoghurt" zagorowicz
* for Tesla demo by Sunflower (http://www.pouet.net/prod.php?which=33)
*/
#define DEFAULTS "*delay: 30000 \n" \
"*count: 30 \n" \
"*showFPS: False \n" \
"*wireframe: False \n" \
# define release_stream 0
#include "xlockmore.h"
#include "gltrackball.h"
#include "rotator.h"
#include <ctype.h>
#ifdef USE_GL /* whole file */
static float change_time = 0;
static float change_time1 = 25;
static float change_time2 = 40;
static float change_time3 = 60;
#define DEF_STREAMS "16"
#include <sys/time.h>
#include <time.h>
typedef struct timeval streamtime;
#define GETSECS(t) ((t).tv_sec)
#define GETMSECS(t) ((t).tv_usec/1000)
#define DEF_SPIN "False"
#define DEF_WANDER "False"
#define DEF_SPEED "1.0"
typedef struct {
float x, y, z;
} Vector;
typedef struct {
Vector *flares;
int num_flares;
GLuint flare_tex;
float speed;
} flare_stream;
typedef struct {
GLXContext *glx_context;
rotator *rot;
trackball_state *trackball;
Bool button_down_p;
time_t start_time;
int num_streams;
flare_stream *streams;
} stream_configuration;
static stream_configuration *ess = NULL;
static int num_streams;
static Bool do_spin;
static GLfloat global_speed;
static Bool do_wander;
static XrmOptionDescRec opts[] = {
{ "-streams", ".streams", XrmoptionSepArg, 0 },
{ "-spin", ".spin", XrmoptionNoArg, "True" },
{ "+spin", ".spin", XrmoptionNoArg, "False" },
{ "-speed", ".speed", XrmoptionSepArg, 0 },
{ "-wander", ".wander", XrmoptionNoArg, "True" },
{ "+wander", ".wander", XrmoptionNoArg, "False" }
};
static argtype vars[] = {
{&num_streams, "streams", "Streams", DEF_STREAMS, t_Int},
{&do_spin, "spin", "Spin", DEF_SPIN, t_Bool},
{&do_wander, "wander", "Wander", DEF_WANDER, t_Bool},
{&global_speed, "speed", "Speed", DEF_SPEED, t_Float},
};
ENTRYPOINT ModeSpecOpt stream_opts = {countof(opts), opts, countof(vars), vars, NULL};
static void gettime(streamtime *t)
{
#ifdef GETTIMEOFDAY_TWO_ARGS
struct timezone tzp;
gettimeofday(t, &tzp);
#else /* !GETTIMEOFDAY_TWO_ARGS */
gettimeofday(t);
#endif /* !GETTIMEOFDAY_TWO_ARGS */
}
/* Window management, etc
*/
ENTRYPOINT void
reshape_stream (ModeInfo *mi, int width, int height)
{
GLfloat h = (GLfloat) height / (GLfloat) width;
glViewport (0, 0, (GLint) width, (GLint) height);
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();
gluPerspective (30.0, 1/h, 1.0, 100.0);
glMatrixMode (GL_MODELVIEW);
glLoadIdentity ();
gluLookAt (0.0, 0.0, 30.0,
0.0, 0.0, 0.0,
0.0, 1.0, 0.0);
glClear (GL_COLOR_BUFFER_BIT);
}
ENTRYPOINT Bool
stream_handle_event (ModeInfo *mi, XEvent *event)
{
stream_configuration *es = &ess[MI_SCREEN(mi)];
if (gltrackball_event_handler (event, es->trackball,
MI_WIDTH (mi), MI_HEIGHT (mi),
&es->button_down_p))
return True;
return False;
}
#define TEX_WIDTH 256
#define TEX_HEIGHT 256
#define COEFF 0.2
static GLuint gen_texture (void)
{
int x, y, i;
float color;
GLuint tex;
unsigned char *texture = (unsigned char *)calloc (TEX_WIDTH * TEX_HEIGHT, 4);
unsigned char *ptr = texture;
float tint[3];
for (i = 0; i < 3; i++)
tint[i] = 1.0 * random() / RAND_MAX;
for (y = 0; y < TEX_HEIGHT; y++) {
for (x = 0; x < TEX_WIDTH; x++) {
color = 255 - sqrt((x - TEX_WIDTH / 2) * (x - TEX_WIDTH / 2) / COEFF
+ (y - TEX_HEIGHT / 2) * (y - TEX_HEIGHT / 2) / COEFF);
if (color < 0)
color = 0;
for (i = 0; i < 3; i++)
ptr[i] = (unsigned char)(color * tint[i]);
ptr[3] = color ? 255 : 0;
ptr += 4;
}
}
glGenTextures (1, &tex);
#ifdef HAVE_GLBINDTEXTURE
glBindTexture (GL_TEXTURE_2D, tex);
#endif /* HAVE_GLBINDTEXTURE */
glPixelStorei (GL_UNPACK_ALIGNMENT, 4);
clear_gl_error ();
glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA, TEX_WIDTH, TEX_HEIGHT,
0, GL_RGBA, GL_UNSIGNED_BYTE, texture);
check_gl_error ("texture");
/* Texture parameters, LINEAR scaling for better texture quality */
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
free (texture);
return tex;
}
static inline void vector_copy (Vector *a, Vector *b)
{
a->x = b->x;
a->y = b->y;
a->z = b->z;
}
/* a += b */
static inline void vector_add (Vector *a, Vector *b)
{
a->x += b->x;
a->y += b->y;
a->z += b->z;
}
/* a -= b */
static inline void vector_sub (Vector *a, Vector *b)
{
a->x -= b->x;
a->y -= b->y;
a->z -= b->z;
}
static void init_flare_stream (flare_stream *s, int num_flares, float bx, float by, float bz, float speed)
{
int i;
s->flares = (Vector *) calloc (num_flares, sizeof (Vector));
s->num_flares = num_flares;
s->flare_tex = gen_texture();
s->speed = speed;
for (i = 0; i != s->num_flares; i++)
{
s->flares[i].x = -800.0f * random() / RAND_MAX - 1150 + bx;
s->flares[i].y = 10.0f * random() / RAND_MAX - 20 + by;
s->flares[i].z = 10.0f * random() / RAND_MAX - 20 + bz;
}
}
static void render_flare_stream (flare_stream *s, float cur_time, Vector *vx, Vector *vy, float alpha)
{
float fMultipler = 1;
int i;
if (s->flare_tex == -1)
return;
if (!s->num_flares)
return;
if (cur_time < change_time)
return;
cur_time -= change_time;
glColor4f (1.0, 1, 1, alpha);
#ifdef HAVE_GLBINDTEXTURE
glBindTexture (GL_TEXTURE_2D, s->flare_tex);
#endif
glBegin (GL_QUADS);
if (cur_time + change_time > change_time1)
{
if (cur_time + change_time > change_time2)
{
fMultipler = 2.5;
}
else
fMultipler = 2;
}
for (i = 0; i != s->num_flares; i++)
{
Vector flare_pos;
Vector cc;
flare_pos.x = fmod (s->flares[i].x + cur_time * s->speed * fMultipler, 800) - 400;
flare_pos.y = s->flares[i].y + 2 * sin (cur_time * 7 + s->flares[i].x);
flare_pos.z = s->flares[i].z + 2 * cos (cur_time * 7 + i * 3.14);
glTexCoord2f (0, 0);
vector_copy (&cc, &flare_pos);
vector_sub (&cc, vx);
vector_add (&cc, vy);
glVertex3fv ((float *)&cc);
glTexCoord2f ( 1, 0 );
vector_copy (&cc, &flare_pos);
vector_add (&cc, vx);
vector_add (&cc, vy);
glVertex3fv ((float *)&cc);
glTexCoord2f ( 1, 1 );
vector_copy (&cc, &flare_pos);
vector_add (&cc, vx);
vector_sub (&cc, vy);
glVertex3fv ((float *)&cc);
glTexCoord2f ( 0, 1 );
vector_copy (&cc, &flare_pos);
vector_sub (&cc, vx);
vector_sub (&cc, vy);
glVertex3fv ((float *)&cc);
}
glEnd ();
}
ENTRYPOINT void
init_stream (ModeInfo *mi)
{
stream_configuration *es;
streamtime current_time;
MI_INIT (mi, ess);
es = &ess[MI_SCREEN(mi)];
es->glx_context = init_GL (mi);
reshape_stream (mi, MI_WIDTH(mi), MI_HEIGHT(mi));
gettime (¤t_time);
es->start_time = GETSECS(current_time) * 1000 + GETMSECS(current_time);
es->num_streams = num_streams;
es->streams = (flare_stream *) calloc (es->num_streams, sizeof(flare_stream));
init_flare_stream (&es->streams[0], 150, 0, 50, 0, 300);
init_flare_stream (&es->streams[1], 150, 0, 0, 0, 150);
init_flare_stream (&es->streams[2], 150, 0, 90, 60, 250);
init_flare_stream (&es->streams[3], 150, 0, -100, 30, 160);
init_flare_stream (&es->streams[4], 150, 0, 50, -100, 340);
init_flare_stream (&es->streams[5], 150, 0, -50, 50, 270 );
init_flare_stream (&es->streams[6], 150, 0, 100, 50, 180);
init_flare_stream (&es->streams[7], 150, 0, -30, 90, 130);
init_flare_stream (&es->streams[8], 150, 0, 150, 10, 200);
init_flare_stream (&es->streams[9], 150, 0, 100, -100, 210);
init_flare_stream (&es->streams[10], 150, 0, 190, 160, 220);
init_flare_stream (&es->streams[11], 150, 0, -200, 130, 230);
init_flare_stream (&es->streams[12], 150, 0, 150, -200, 240);
init_flare_stream (&es->streams[13], 150, 0, -150, 250, 160);
init_flare_stream (&es->streams[14], 150, 0, 200, 150, 230);
init_flare_stream (&es->streams[15], 150, 0, -130, 190, 250);
{
double spin_speed = 0.5 * global_speed;
double wander_speed = 0.02 * global_speed;
double spin_accel = 1.1;
es->rot = make_rotator (do_spin ? spin_speed : 0,
do_spin ? spin_speed : 0,
do_spin ? spin_speed : 0,
spin_accel,
do_wander ? wander_speed : 0,
True);
es->trackball = gltrackball_init (True);
}
}
ENTRYPOINT void
free_stream (ModeInfo * mi)
{
stream_configuration *es = &ess[MI_SCREEN(mi)];
int i;
if (!es->glx_context) return;
glXMakeCurrent (MI_DISPLAY(mi), MI_WINDOW(mi), *es->glx_context);
if (es->trackball) gltrackball_free (es->trackball);
if (es->rot) free_rotator (es->rot);
for (i = 0; i < es->num_streams; i++) {
free (es->streams[i].flares);
glDeleteTextures (1, &es->streams[i].flare_tex);
}
if (es->streams) free (es->streams);
}
static void inverse_matrix (float m[16]) {
double a,b,c,d,e,f,g,h,i,j,k,l;
register double dW;
a = m[ 0]; b = m[ 1]; c = m[ 2];
d = m[ 4]; e = m[ 5]; f = m[ 6];
g = m[ 8]; h = m[ 9]; i = m[10];
j = m[12]; k = m[13]; l = m[14];
dW = 1.0 / (a * (e * i - f * h)
- (b * (d * i - f * g)
+ c * (e * g - d * h)));
m[ 0]= (float)((e * i - f * h) * dW);
m[ 1]= (float)((c * h - b * i) * dW);
m[ 2]= (float)((b * f - c * e) * dW);
m[ 4]= (float)((f * g - d * i) * dW);
m[ 5]= (float)((a * i - c * g) * dW);
m[ 6]= (float)((c * d - a * f) * dW);
m[ 8]= (float)((d * h - e * g) * dW);
m[ 9]= (float)((b * g - a * h) * dW);
m[10]= (float)((a * e - b * d) * dW);
m[12]= (float)((e * (g * l - i * j)
+ f * (h * j - g * k)
- d * (h * l - i * k)) * dW);
m[13]= (float)((a * (h * l - i * k)
+ b * (i * j - g * l)
+ c * (g * k - h * j)) * dW);
m[14]= (float)((b * (d * l - f * j)
+ c * (e * j - d * k)
- a * (e * l - f * k)) * dW);
}
ENTRYPOINT void
draw_stream (ModeInfo *mi)
{
stream_configuration *es = &ess[MI_SCREEN(mi)];
Display *dpy = MI_DISPLAY(mi);
Window window = MI_WINDOW(mi);
streamtime current_time;
float cur_time;
int i;
float alpha = 1.0;
Vector vx;
Vector vy;
GLfloat m[4*4];
if (!es->glx_context)
return;
gettime (¤t_time);
cur_time = (float)(GETSECS(current_time) * 1000 + GETMSECS(current_time) - es->start_time) / 1000.0;
cur_time *= global_speed;
glXMakeCurrent (MI_DISPLAY(mi), MI_WINDOW(mi), *es->glx_context);
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();
glFrustum (-.6f, .6f, -.45f, .45f, 1, 1000);
glMatrixMode (GL_MODELVIEW);
glLoadIdentity ();
glEnable (GL_LIGHTING);
glEnable (GL_TEXTURE_2D);
glEnable (GL_BLEND);
glBlendFunc (GL_SRC_ALPHA, GL_ONE);
glDisable (GL_CULL_FACE);
glDisable (GL_DEPTH_TEST);
glDepthMask (0);
glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_ADD);
glTranslatef (0, 0, -300);
glRotatef (cur_time * 30, 1, 0, 0);
glRotatef (30 * sin(cur_time / 3) + 10, 0, 0, 1);
{
double x, y, z;
get_position (es->rot, &x, &y, &z, !es->button_down_p);
glTranslatef((x - 0.5) * 8,
(y - 0.5) * 8,
(z - 0.5) * 15);
gltrackball_rotate (es->trackball);
get_rotation (es->rot, &x, &y, &z, !es->button_down_p);
glRotatef (x * 360, 1.0, 0.0, 0.0);
glRotatef (y * 360, 0.0, 1.0, 0.0);
glRotatef (z * 360, 0.0, 0.0, 1.0);
}
if (cur_time > change_time1)
{
if (cur_time > change_time2)
{
glRotatef (90, 0, 1, 0);
if (cur_time > change_time3)
es->start_time = GETSECS(current_time) * 1000 + GETMSECS(current_time) - 5000;
}
else
{
glRotatef (180, 0, 1, 0);
}
}
glEnable ( GL_FOG);
glFogf (GL_FOG_START, 200);
glFogf (GL_FOG_END, 500);
glFogf (GL_FOG_MODE, GL_LINEAR);
glGetFloatv (GL_MODELVIEW_MATRIX, m);
inverse_matrix (m);
vx.x = m[0] * 10;
vx.y = m[1] * 10;
vx.z = m[2] * 10;
vy.x = m[4] * 10;
vy.y = m[5] * 10;
vy.z = m[6] * 10;
mi->polygon_count = 0;
for (i = 0; i != es->num_streams; i++)
{
mi->polygon_count += es->streams[i].num_flares;
render_flare_stream (&es->streams[i], cur_time, &vx, &vy, alpha);
}
glDisable (GL_TEXTURE_2D);
glDisable (GL_LIGHTING);
glDisable (GL_FOG);
glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
if (mi->fps_p) do_fps (mi);
glFinish();
glXSwapBuffers (dpy, window);
}
XSCREENSAVER_MODULE_2("EnergyStream", energystream, stream)
#endif /* USE_GL */