--- /dev/null
+/* 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 refresh_stream 0
+#undef countof
+#define countof(x) (sizeof((x))/sizeof((*x)))
+
+#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_INT_8_8_8_8_REV, 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;
+
+ if (!ess)
+ {
+ ess = (stream_configuration *)
+ calloc (MI_NUM_SCREENS(mi), sizeof (stream_configuration));
+ if (!ess)
+ {
+ fprintf (stderr, "%s: out of memory\n", progname);
+ exit (1);
+ }
+ }
+
+ 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
+release_stream (ModeInfo * mi)
+{
+ int screen;
+
+ for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++)
+ {
+ stream_configuration *es = &ess[screen];
+ int i;
+
+ for (i = 0; i < es->num_streams; i++) {
+ free (es->streams[i].flares);
+ glDeleteTextures (1, &es->streams[i].flare_tex);
+ }
+
+ free (es->streams);
+ }
+
+ FreeAllGL (mi);
+}
+
+
+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 */
projects / xscreensaver / blobdiff