/* cubestack, Copyright (c) 2016 Jamie Zawinski <jwz@jwz.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.
*/
#define DEFAULTS "*delay: 30000 \n" \
"*showFPS: False \n" \
"*wireframe: False \n" \
"*suppressRotationAnimation: True\n" \
# define release_cube 0
#include "xlockmore.h"
#include "colors.h"
#include "rotator.h"
#include "gltrackball.h"
#include <ctype.h>
#ifdef USE_GL /* whole file */
#define DEF_WANDER "True"
#define DEF_SPEED "1.0"
#define DEF_THICKNESS "0.13"
#define DEF_OPACITY "0.7"
typedef struct {
GLXContext *glx_context;
rotator *rot;
trackball_state *trackball;
Bool button_down_p;
GLfloat state;
GLfloat r;
int length;
int ncolors;
XColor *colors;
int ccolor;
} cube_configuration;
static cube_configuration *bps = NULL;
static GLfloat speed;
static GLfloat thickness;
static GLfloat opacity;
static Bool do_wander;
static XrmOptionDescRec opts[] = {
{ "-wander", ".wander", XrmoptionNoArg, "True" },
{ "+wander", ".wander", XrmoptionNoArg, "False" },
{ "-speed", ".speed", XrmoptionSepArg, 0 },
{ "-thickness", ".thickness", XrmoptionSepArg, 0 },
{ "-opacity", ".opacity", XrmoptionSepArg, 0 },
};
static argtype vars[] = {
{&do_wander, "wander", "Wander", DEF_WANDER, t_Bool},
{&speed, "speed", "Speed", DEF_SPEED, t_Float},
{&thickness, "thickness", "Thickness", DEF_THICKNESS, t_Float},
{&opacity, "opacity", "Opacity", DEF_OPACITY, t_Float},
};
ENTRYPOINT ModeSpecOpt cube_opts = {countof(opts), opts, countof(vars), vars, NULL};
static int
draw_strut (ModeInfo *mi)
{
int wire = MI_IS_WIREFRAME(mi);
int polys = 0;
GLfloat h;
glPushMatrix();
glFrontFace (GL_CCW);
glNormal3f (0, 0, -1);
glTranslatef (-0.5, -0.5, 0);
glBegin (wire ? GL_LINE_LOOP : GL_TRIANGLE_FAN);
glVertex3f (0, 0, 0);
glVertex3f (1, 0, 0);
glVertex3f (1 - thickness, thickness, 0);
glVertex3f (thickness, thickness, 0);
glEnd();
polys += 2;
h = 0.5 - thickness;
if (h >= 0.25)
{
glBegin (wire ? GL_LINE_LOOP : GL_TRIANGLE_FAN);
glVertex3f (0.5, 0.5, 0);
glVertex3f (0.5 - thickness/2, 0.5 - thickness/2, 0);
glVertex3f (0.5 - thickness/2, 0.5 - h/2, 0);
glVertex3f (0.5 + thickness/2, 0.5 - h/2, 0);
glVertex3f (0.5 + thickness/2, 0.5 - thickness/2, 0);
glEnd();
polys += 3;
}
glPopMatrix();
return polys;
}
static int
draw_face (ModeInfo *mi)
{
int i;
int polys = 0;
for (i = 0; i < 4; i++)
{
polys += draw_strut (mi);
glRotatef (90, 0, 0, 1);
}
return polys;
}
static GLfloat
ease_fn (GLfloat r)
{
return cos ((r/2 + 1) * M_PI) + 1; /* Smooth curve up, end at slope 1. */
}
static GLfloat
ease_ratio (GLfloat r)
{
GLfloat ease = 0.5;
if (r <= 0) return 0;
else if (r >= 1) return 1;
else if (r <= ease) return ease * ease_fn (r / ease);
else if (r > 1-ease) return 1 - ease * ease_fn ((1 - r) / ease);
else return r;
}
static int
draw_cube_1 (ModeInfo *mi, GLfloat state, GLfloat color[4], Bool bottom_p)
{
int polys = 0;
int istate = state;
GLfloat r = state - istate;
GLfloat a = color[3];
r = ease_ratio (r);
# define COLORIZE(R) \
color[3] = a * R; \
glMaterialfv (GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, color); \
glColor4fv (color)
if (bottom_p)
{
GLfloat r2 = (state < 0 ? 1 + state : 1);
COLORIZE(r2);
polys += draw_face (mi); /* Bottom */
}
if (state >= 0) /* Left */
{
GLfloat r2 = (istate == 0 ? r : 1);
COLORIZE(r2);
glPushMatrix();
glTranslatef (-0.5, 0.5, 0);
glRotatef (-r2 * 90, 0, 1, 0);
glTranslatef (0.5, -0.5, 0);
polys += draw_face (mi);
glPopMatrix();
}
if (state >= 1) /* Back */
{
GLfloat r2 = (istate == 1 ? r : 1);
COLORIZE(r2);
glPushMatrix();
glTranslatef (-0.5, 0.5, 0);
glRotatef ( 90, 0, 1, 0);
glRotatef (-90, 0, 0, 1);
glRotatef (-r2 * 90, 0, 1, 0);
glTranslatef (0.5, -0.5, 0);
polys += draw_face (mi);
glPopMatrix();
}
if (state >= 2) /* Right */
{
GLfloat r2 = (istate == 2 ? r : 1);
COLORIZE(r2);
glPushMatrix();
glTranslatef (0.5, 0.5, 0);
glRotatef ( 90, 0, 1, 0);
glRotatef (-90, 0, 0, 1);
glRotatef (-90, 0, 1, 0);
glRotatef (-r2 * 90, 0, 1, 0);
glTranslatef (-0.5, -0.5, 0);
polys += draw_face (mi);
glPopMatrix();
}
if (state >= 3) /* Front */
{
GLfloat r2 = (istate == 3 ? r : 1);
COLORIZE(r2);
glPushMatrix();
glTranslatef (0.5, 0.5, 0);
glRotatef ( 90, 0, 1, 0);
glRotatef (-90, 0, 0, 1);
glRotatef (-180, 0, 1, 0);
glTranslatef (-1, 0, 0);
glRotatef (-r2 * 90, 0, 1, 0);
glTranslatef (0.5, -0.5, 0);
polys += draw_face (mi);
glPopMatrix();
}
if (state >= 4) /* Top */
{
GLfloat r2 = (istate == 4 ? r : 1);
COLORIZE(r2);
glPushMatrix();
glTranslatef (0, 0, 1);
glRotatef (-90, 0, 0, 1);
glTranslatef (0.5, 0.5, 0);
glRotatef (-90, 0, 1, 0);
glRotatef (r2 * 90, 0, 1, 0);
glTranslatef (-0.5, -0.5, 0);
polys += draw_face (mi);
glPopMatrix();
}
return polys;
}
static int
draw_cubes (ModeInfo *mi)
{
cube_configuration *bp = &bps[MI_SCREEN(mi)];
int polys = 0;
GLfloat z = bp->state / 6;
int i;
GLfloat c[4];
int c0 = bp->ccolor;
GLfloat alpha = opacity;
glPushMatrix();
glTranslatef (0, 0, -1.5 - z);
glTranslatef (0, 0, -bp->length);
for (i = bp->length-1; i >= 0; i--)
{
int c1 = c0 - i - 1;
if (c1 < 0) c1 += bp->ncolors;
c[0] = bp->colors[c1].red / 65536.0;
c[1] = bp->colors[c1].green / 65536.0;
c[2] = bp->colors[c1].blue / 65536.0;
c[3] = alpha;
glTranslatef (0, 0, 1);
polys += draw_cube_1 (mi, 5, c, i == bp->length - 1);
}
c[0] = bp->colors[c0].red / 65536.0;
c[1] = bp->colors[c0].green / 65536.0;
c[2] = bp->colors[c0].blue / 65536.0;
c[3] = alpha;
glTranslatef (0, 0, 1);
polys += draw_cube_1 (mi, bp->state, c, bp->length == 0);
glPopMatrix();
return polys;
}
/* Window management, etc
*/
ENTRYPOINT void
reshape_cube (ModeInfo *mi, int width, int height)
{
GLfloat h = (GLfloat) height / (GLfloat) width;
int y = 0;
if (width > height * 5) { /* tiny window: show middle */
height = width;
y = -height/2;
h = height / (GLfloat) width;
}
glViewport (0, y, (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);
{
GLfloat s = (MI_WIDTH(mi) < MI_HEIGHT(mi)
? (MI_WIDTH(mi) / (GLfloat) MI_HEIGHT(mi))
: 1);
glScalef (s, s, s);
}
glClear(GL_COLOR_BUFFER_BIT);
}
ENTRYPOINT Bool
cube_handle_event (ModeInfo *mi, XEvent *event)
{
cube_configuration *bp = &bps[MI_SCREEN(mi)];
if (gltrackball_event_handler (event, bp->trackball,
MI_WIDTH (mi), MI_HEIGHT (mi),
&bp->button_down_p))
return True;
else if (event->xany.type == KeyPress)
{
KeySym keysym;
char c = 0;
XLookupString (&event->xkey, &c, 1, &keysym, 0);
if (c == ' ' || c == '\t')
{
bp->ncolors = 32;
make_smooth_colormap (0, 0, 0,
bp->colors, &bp->ncolors,
False, 0, False);
return True;
}
}
return False;
}
ENTRYPOINT void
init_cube (ModeInfo *mi)
{
cube_configuration *bp;
int wire = MI_IS_WIREFRAME(mi);
MI_INIT (mi, bps);
bp = &bps[MI_SCREEN(mi)];
bp->glx_context = init_GL(mi);
reshape_cube (mi, MI_WIDTH(mi), MI_HEIGHT(mi));
if (!wire)
{
glDisable (GL_LIGHTING);
glEnable(GL_DEPTH_TEST);
glShadeModel (GL_SMOOTH);
glEnable (GL_NORMALIZE);
glDisable (GL_CULL_FACE);
glEnable (GL_BLEND);
glDisable (GL_DEPTH_TEST);
glBlendFunc (GL_SRC_ALPHA, GL_ONE);
}
{
double wander_speed = 0.005;
bp->rot = make_rotator (0, 0, 0, 0,
do_wander ? wander_speed : 0,
False);
bp->trackball = gltrackball_init (True);
}
if (thickness > 0.5)
thickness = 0.5;
if (thickness < 0.001)
thickness = 0.001;
bp->ncolors = 32;
bp->colors = (XColor *) calloc(bp->ncolors, sizeof(XColor));
make_smooth_colormap (0, 0, 0,
bp->colors, &bp->ncolors,
False, 0, False);
bp->state = -1;
}
ENTRYPOINT void
draw_cube (ModeInfo *mi)
{
cube_configuration *bp = &bps[MI_SCREEN(mi)];
Display *dpy = MI_DISPLAY(mi);
Window window = MI_WINDOW(mi);
if (!bp->glx_context)
return;
glXMakeCurrent(MI_DISPLAY(mi), MI_WINDOW(mi), *bp->glx_context);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix ();
{
double x, y, z;
get_position (bp->rot, &x, &y, &z, !bp->button_down_p);
glTranslatef((x - 0.5) * 4,
(y - 0.5) * 4,
(z - 0.5) * 2);
gltrackball_rotate (bp->trackball);
}
mi->polygon_count = 0;
glScalef (6, 6, 6);
glRotatef (-45, 1, 0, 0);
glRotatef (20, 0, 0, 1);
glRotatef (bp->r, 0, 0, 1);
mi->polygon_count = draw_cubes (mi);
glPopMatrix ();
if (!bp->button_down_p)
{
int max = 6;
bp->state += speed * 0.015;
bp->r += speed * 0.05;
while (bp->r > 360)
bp->r -= 360;
while (bp->state > max)
{
bp->state -= max;
bp->length++;
bp->ccolor++;
if (bp->ccolor > bp->ncolors)
bp->ccolor = 0;
}
if (bp->length > 20)
bp->length = 20;
}
if (mi->fps_p) do_fps (mi);
glFinish();
glXSwapBuffers(dpy, window);
}
ENTRYPOINT void
free_cube (ModeInfo *mi)
{
cube_configuration *bp = &bps[MI_SCREEN(mi)];
if (!bp->glx_context) return;
glXMakeCurrent(MI_DISPLAY(mi), MI_WINDOW(mi), *bp->glx_context);
if (bp->trackball) gltrackball_free (bp->trackball);
if (bp->rot) free_rotator (bp->rot);
if (bp->colors) free (bp->colors);
}
XSCREENSAVER_MODULE_2 ("CubeStack", cubestack, cube)
#endif /* USE_GL */
