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dockapps/wmdots/wmdots/wmdots.c
Doug Torrance 7e78639bb6 Remove trailing whitespace.
2017-02-21 11:15:02 +00:00

668 lines
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// WM-Dots the Window Maker 3d Rotating Dots Demo by Mark I Manning IV
// =======================================================================
// This demo is based on an old DOS demo I did a number of years ago. The
// trick was to get it to work in an 64 x 64 window instead of the
// 320 x 200 of the original. (and in 16 instead of 256 colours :)
// Much of these sources are based on other dockable application sources.
// For this reason, and because it is the right thing to do, this file is
// distributed under the GPL. Use it and abuse it as you will.
// Flames, critisizm and general nukings can be sent to....
// i440r@mailcity.com
// I have included the sources (in 100% pure ASM) to the afore mentioned
// original demo. These you can also consider covered by the GPL.
// Maybe someone can help me convert the bump mapping in the original to
// use only 16 colours :) (actually, I have space in the master.xpm for
// 32 colours if I retain a 2 x 2 pixle size. If i go to 1 x 1 i can
// fit 64 colours in there :)
// Yea... I know... Im supposed to be sparing of system resources like
// colour allocations but come on guys... this IS a demo after all :)
// Demos are supposed to be abusive of system resources eh??? :)
// This source file is 100% TAB FREE. Use any editor/viewer you want
// to view it with and set ANY size tabs and it will STILL look right.
// TABS ARE EVIL!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
// Also Linus T is wrong. Indentations of 8 are an abomination and so is
// k&r source formatting. So There!
// Apart from that... Linus for president :)
// or George W. Bush!!!
// -----------------------------------------------------------------------
// blah :)
// Version 0.1 beta Released Saturday October 9 1999
//
// To do... Fix bug that causes core dump when the "cross" object
// rotates outside window (its not a clipping problem).
// Find out why the "cross" object is not cross shaped in
// this demo when it is in the dos version.
// Change pixle sizes to 1 x 1 for objects that are in
// the distance.
// Move all object definitions out of this file and into
// some kind of rc file and allow user defined objects
// Add greets to the credits display :)
// Impliment better light shading (in object space?)
// Prevent dark pixles overwriting light ones
//
// Done... Scrapped idea about different pixle sizez, it didn't look
// as good as i thunked it would :)
// Fixed adjust_angle() to be angle +128 not angle +127
// Fixed cross by defining xyz as char instead of int
// Fixed core dump problem with cross: Oopts it was a
// clipping problem, z clipping points behind camera! :)
// Added size macro (prolly a bad name for it tho :)
// Implimented better light shading but its still not
// quite right yet...
// Removed math.h from includes as im not using any
// functions therein. Saved a whopping 4 bytes :)
// Added code to draw_point() to prevent dark pels from
// being drawn over lighter pels. Dark pels are further
// away and should be BEHIND the lighter ones. There is
// almost no cpu bash here and I dont need to z sort pels
//
//
// Version 0.2 beta Released Saturday October 9 1999
//
// To do.. Still gotta move objects to rc file....
//
//
//
// Done...
// -----------------------------------------------------------------------
// includes
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <X11/xpm.h>
#include "../wmgeneral/wmgeneral.h"
#include "master.xpm"
#include "sintab.c" // sin() and cos() are crap!
// -----------------------------------------------------------------------
// defines
#define PEL_SIZE 2 // 1 or 2 only
#define MAX_POINTS 125 // max # pels in an object
#define MASK_WIDTH 64 // window bitmap mask dimentions
#define MASK_HEIGHT 64
#define MASK_SIZE MASK_WIDTH * MASK_HEIGHT
// adjust angle for cos table lookup. cos = right angle further
// on in sin table, circle = 512 degrees...
#define adjust(angle) ((angle + 128) & 0x1ff)
#define size(array) ((sizeof(array) / sizeof(array[0])))
// -----------------------------------------------------------------------
// typedefs...
typedef struct // a point in 3d space
{
char x, y, z;
}xyz;
typedef struct // a point in 2d space
{
int x, y;
}xy;
typedef struct
{
int counter; // count down to next speed/shape change
int reset; // initial value of counter
int *ptr; // pointer to item to modify
int delta; // ammount to change item by
int upper; // upper limit for item
int lower; // lower limit for item
}modifier;
// -----------------------------------------------------------------------
// object structures...
xyz cube[]=
{
{-35,-35,-35},{-35,-35,-15},{-35,-35, 05},{-35,-35, 25},{-35,-35, 45},
{-35,-15,-35},{-35,-15,-15},{-35,-15, 05},{-35,-15, 25},{-35,-15, 45},
{-35, 05,-35},{-35, 05,-15},{-35, 05, 05},{-35, 05, 25},{-35, 05, 45},
{-35, 25,-35},{-35, 25,-15},{-35, 25, 05},{-35, 25, 25},{-35, 25, 45},
{-35, 45,-35},{-35, 45,-15},{-35, 45, 05},{-35, 45, 25},{-35, 45, 45},
{-15,-35,-35},{-15,-35,-15},{-15,-35, 05},{-15,-35, 25},{-15,-35, 45},
{-15,-15,-35},{-15,-15,-15},{-15,-15, 05},{-15,-15, 25},{-15,-15, 45},
{-15, 05,-35},{-15, 05,-15},{-15, 05, 05},{-15, 05, 25},{-15, 05, 45},
{-15, 25,-35},{-15, 25,-15},{-15, 25, 05},{-15, 25, 25},{-15, 25, 45},
{-15, 45,-35},{-15, 45,-15},{-15, 45, 05},{-15, 45, 25},{-15, 45, 45},
{ 05,-35,-35},{ 05,-35,-15},{ 05,-35, 05},{ 05,-35, 25},{ 05,-35, 45},
{ 05,-15,-35},{ 05,-15,-15},{ 05,-15, 05},{ 05,-15, 25},{ 05,-15, 45},
{ 05, 05,-35},{ 05, 05,-15},{ 05, 05, 05},{ 05, 05, 25},{ 05, 05, 45},
{ 05, 25,-35},{ 05, 25,-15},{ 05, 25, 05},{ 05, 25, 25},{ 05, 25, 45},
{ 05, 45,-35},{ 05, 45,-15},{ 05, 45, 05},{ 05, 45, 25},{ 05, 45, 45},
{ 25,-35,-35},{ 25,-35,-15},{ 25,-35, 05},{ 25,-35, 25},{ 25,-35, 45},
{ 25,-15,-35},{ 25,-15,-15},{ 25,-15, 05},{ 25,-15, 25},{ 25,-15, 45},
{ 25, 05,-35},{ 25, 05,-15},{ 25, 05, 05},{ 25, 05, 25},{ 25, 05, 45},
{ 25, 25,-35},{ 25, 25,-15},{ 25, 25, 05},{ 25, 25, 25},{ 25, 25, 45},
{ 25, 45,-35},{ 25, 45,-15},{ 25, 45, 05},{ 25, 45, 25},{ 25, 45, 45},
{ 45,-35,-35},{ 45,-35,-15},{ 45,-35, 05},{ 45,-35, 25},{ 45,-35, 45},
{ 45,-15,-35},{ 45,-15,-15},{ 45,-15, 05},{ 45,-15, 25},{ 45,-15, 45},
{ 45, 05,-35},{ 45, 05,-15},{ 45, 05, 05},{ 45, 05, 25},{ 45, 05, 45},
{ 45, 25,-35},{ 45, 25,-15},{ 45, 25, 05},{ 45, 25, 25},{ 45, 25, 45},
{ 45, 45,-35},{ 45, 45,-15},{ 45, 45, 05},{ 45, 45, 25},{ 45, 45, 45}
};
xyz star[]=
{
{-35,-35, 05},{-35,-15, 05},{-35, 05, 05},{-35, 25, 05},{-35, 45, 05},
{-15,-35, 05},{-15,-15, 05},{-15, 05, 05},{-15, 25, 05},{-15, 45, 05},
{ 05,-35, 05},{ 05,-15, 05},{ 05, 05, 05},{ 05, 25, 05},{ 05, 45, 05},
{ 25,-35, 05},{ 25,-15, 05},{ 25, 05, 05},{ 25, 25, 05},{ 25, 45, 05},
{ 45,-35, 05},{ 45,-15, 05},{ 45, 05, 05},{ 45, 25, 05},{ 45, 45, 05},
{ 05,-35,-35},{ 05,-35,-15},{ 05,-35, 25},{ 05,-35, 45},{-35, 05,-35},
{ 05,-15,-35},{ 05,-15,-15},{ 05,-15, 25},{ 05,-15, 45},{-15, 05,-35},
{ 05, 05,-35},{ 05, 05,-15},{ 05, 05, 25},{ 05, 05, 45},{ 05, 05,-35},
{ 05, 25,-35},{ 05, 25,-15},{ 05, 25, 25},{ 05, 25, 45},{ 25, 05,-35},
{ 05, 45,-35},{ 05, 45,-15},{ 05, 45, 25},{ 05, 45, 45},{ 45, 05,-35},
{-35, 05,-15},{-35, 05, 25},{-35, 05, 45},{-15, 05,-15},{-15, 05, 25},
{-15, 05, 45},{ 05, 05,-15},{ 05, 05, 25},{ 05, 05, 45},{ 25, 05,-15},
{ 25, 05, 25},{ 25, 05, 45},{ 45, 05,-15},{ 45, 05, 25},{ 45, 05, 45}
};
xyz dots[]=
{
{-35,-35,-35},{-35,-35, 45},{ 45, 45,-35},{ 45, 45, 45},{ 5,-35, 5},
{ 5, 45, 5}
};
xyz square[]=
{
{-35,-35,-35},{-35,-15,-35},{-35, 05,-35},{-35, 25,-35},{-35, 45,-35},
{-15,-35,-35},{-15,-15,-35},{-15, 05,-35},{-15, 25,-35},{-15, 45,-35},
{ 05,-35,-35},{ 05,-15,-35},{ 05, 05,-35},{ 05, 25,-35},{ 05, 45,-35},
{ 25,-35,-35},{ 25,-15,-35},{ 25, 05,-35},{ 25, 25,-35},{ 25, 45,-35},
{ 45,-35,-35},{ 45,-15,-35},{ 45, 05,-35},{ 45, 25,-35},{ 45, 45,-35}
};
xyz cross[]=
{
{0x00,0x00,0x19}, {0x00,0x05,0x19}, {0x00,0x14,0x01}, {0x00,0x32,0x00},
{0x00,0x7D,0x00}, {0x00,0xC9,0x00}, {0x01,0x5F,0x01}, {0x01,0xAB,0x01},
{0x01,0xF6,0x01}, {0x02,0x41,0x02}, {0x02,0x8D,0x02}, {0x02,0xD8,0x02},
{0x03,0x23,0x03}, {0x03,0x05,0x04}, {0x03,0x6F,0x03}, {0x03,0xBA,0x03},
{0x04,0x51,0x04}, {0x04,0x9C,0x04}, {0x04,0xE7,0x04}, {0x05,0x13,0x06},
{0x05,0x32,0x05}, {0x05,0x7D,0x05}, {0x05,0xC8,0x05}, {0x06,0x5E,0x06},
{0x06,0xA9,0x06}, {0x06,0xF4,0x06}, {0x07,0x3F,0x07}, {0x07,0x8A,0x07},
{0x07,0xD5,0x07}, {0x08,0x00,0x09}, {0x08,0x20,0x08}, {0x08,0x6B,0x08},
{0x08,0xB5,0x08}, {0x09,0x4B,0x09}, {0x09,0x95,0x09}, {0x09,0xE0,0x09},
{0x0A,0x09,0x0B}, {0x0A,0x2A,0x0A}, {0x0A,0x75,0x0A}, {0x0A,0xBF,0x0A},
{0x0B,0x54,0x0B}, {0x0D,0x07,0x26}, {0x0F,0x02,0x28}, {0x19,0x09,0x32},
{0x1E,0x04,0x37}, {0x22,0x0B,0x3B}, {0x2C,0x06,0x45}, {0x2D,0x01,0x46},
{0x39,0x08,0x52}, {0x3D,0x03,0x56}, {0x43,0x0A,0x5C}, {0x4B,0x00,0x64},
{0x4B,0x05,0x64}, {0x58,0x07,0x71}, {0x5B,0x02,0x74}, {0x64,0x09,0x7C},
{0x84,0x08,0x9C}, {0x88,0x03,0xA1}, {0x8D,0x0A,0xA6}, {0x96,0x00,0xAF},
{0x96,0x05,0xAF}, {0xA3,0x07,0xBC}, {0xA6,0x02,0xBF}, {0xAE,0x09,0xC7},
{0xB5,0x04,0xCE}, {0xC2,0x06,0xDB}, {0xC4,0x01,0xDD}, {0xCE,0x08,0xE7},
{0xD3,0x03,0xEC}, {0xD8,0x0A,0xF1}, {0xE1,0x05,0xFA}, {0xE2,0x00,0xFB},
{0xEE,0x07,0x07}, {0xF1,0x02,0x0A}, {0xF9,0x09,0x11}
};
// -----------------------------------------------------------------------
// object lists...
xyz *obj_list[]= // pointers to each object
{
(xyz *) &cube,
(xyz *) &dots,
(xyz *) &star,
(xyz *) &square,
(xyz *) &cross
};
int point_counts[]= // number of points in each object
{
size(cube),
size(dots),
size(star),
size(square),
size(cross)
};
#define NUM_OBJECTS size(obj_list)
// -----------------------------------------------------------------------
// i love global variables :)
// I hate 40 page functions with 50 levels if,and and but loop nesting
char *ProgName = NULL;
char *Version = "0.2 Beta";
int x_angle = 0; // angles of rotation in each axis
int y_angle = 0;
int z_angle = 0;
short cos_x = 0; // trig stuff
short cos_y = 0;
short cos_z = 0;
short sin_x = 0;
short sin_y = 0;
short sin_z = 0;
int x_off = 30; // world space position of object
int y_off = 30;
int z_off = 150;
int delta_x = 1; // rotational speed of object
int delta_y = 1;
int delta_z = 1;
int itters = 1; // number of frames till shape change
int num_points = 0; // number of points in object
int obj_number = 0;
xyz *object = NULL; // pointer to current object
xy trail_1[125]; // frame histories
xy trail_2[125];
xy trail_3[125];
char *p_buff; // addr of pel buffer ( see draw_point() )
// -----------------------------------------------------------------------
//
modifier w1 = // changes x rotation speed
{
30, // count down counter
34, // reset value for countdown counter
&delta_x, // item to modify on count = 0
2, // ammount to add to item
8, // upper limit for item
0, // lower limit for item
};
modifier w2 = // changes y rotation speed
{
20, 20, &delta_y, -1, 6, 0
};
modifier w3 = // changes z rotation speed
{
30, 30, &delta_z, 1, 7, 0
};
modifier w4 = // zooms object in / out of window
{
4, 4, &z_off, -2, 200, 90
};
// modifier w5 = // these two do some funky things with
// { // object space but they tend to make
// 10,10,&x_off,-3,30,10 // the objects small and look further
// }; // away so im not using them
//
// modifier w6 = // but go ahead and take a look at what
// { // they do :)
// 10,30,&y_off,-5,30,10
// };
// -----------------------------------------------------------------------
// draw a point at x/y in specified colour
void draw_point(int x, int y, int c)
{
char *p;
if(x != -1) // is point clipped ?
{
c <<= 1; // adjust c for xpm lookup of colour
p = p_buff + (x + (MASK_WIDTH * y));
if (*p > c) // if pel at *p is higher its darker so
{ // its ok to overwrite it
*p = c; // remember pel colour at this position
copyXPMArea(c, 65, PEL_SIZE, PEL_SIZE, x, y);
}
}
}
// -----------------------------------------------------------------------
// Erase previously drawn point (draw again in BLACK!!!)
void erase_point(int x, int y)
{
if(x != -1) // is point clipped?
{
copyXPMArea(34, 65, PEL_SIZE, PEL_SIZE, x, y);
}
}
// -----------------------------------------------------------------------
// Process pending X events
void do_pending(void)
{
XEvent Event;
while (XPending(display)) // for all pending events do...
{
XNextEvent(display, &Event); // get event type
switch (Event.type) // we are only interested in...
{
case Expose: // expose events and...
RedrawWindow();
break;
case DestroyNotify: // our own "pending" demise :)
XCloseDisplay(display);
exit(0);
break;
}
}
}
// -----------------------------------------------------------------------
// clear frame history buffers
void clear_histories(void)
{
int i = MAX_POINTS;
while (i--) // for loops suck
{
trail_1[i].x = trail_1[i].y = -1; // -1 = invalid coordinate
trail_2[i].x = trail_2[i].y = -1; // draw_point() ignores -1
trail_3[i].x = trail_3[i].y = -1;
}
}
// -----------------------------------------------------------------------
// erase points that are 3 frames old. shift frame histories
void do_trails(void)
{
int i = MAX_POINTS;
while (i--)
{
erase_point(trail_3[i].x, trail_3[i].y);
trail_3[i].x = trail_2[i].x; // shift points within history
trail_2[i].x = trail_1[i].x; // buffers
trail_1[i].x = -1;
trail_3[i].y = trail_2[i].y;
trail_2[i].y = trail_1[i].y;
trail_1[i].y = -1;
}
}
// -----------------------------------------------------------------------
// pre calculate sin and cosine values for x y and z angles of rotation
void sincos(void)
{
sin_x = sin_tab[x_angle];
sin_y = sin_tab[y_angle];
sin_z = sin_tab[z_angle];
cos_x = sin_tab[adjust(x_angle)];
cos_y = sin_tab[adjust(y_angle)];
cos_z = sin_tab[adjust(z_angle)];
}
// -----------------------------------------------------------------------
// roatate object about x y and z axis (in object space)
void rotate(int *px, int *py, int *pz)
{
int tx, ty, tz; // temp store
if (x_angle) // rotate point about x axis...
{
ty = (*py * cos_x) - (*pz * sin_x);
tz = (*py * sin_x) + (*pz * cos_x);
*py = (ty >> 14); // sin table is scaled up so we
*pz = (tz >> 14); // must re scale all results down
}
if (y_angle) // rotate point about y axis
{
tx = (*px * cos_y) - (*pz * sin_y);
tz = (*px * sin_y) + (*pz * cos_y);
*px = (tx >> 14);
*pz = (tz >> 14);
}
if (z_angle) // rotate point about z axis
{
tx = (*px * cos_z) - (*py * sin_z);
ty = (*px * sin_z) + (*py * cos_z);
*px = (tx >> 14);
*py = (ty >> 14);
}
}
// -----------------------------------------------------------------------
// project point in 3d space onto plane in 2d space
void project(int px, int py, int pz, int *x, int *y)
{
int tx, ty; // temp store...
*x = *y = -1; // assume point is clipped
if ((z_off + pz - 5) < 0)
{
return;
}
ty = ((y_off * py) / (z_off + pz)) + 30;
if ((ty > 5) && (ty < 59))
{
tx = ((x_off * px) / (z_off + pz)) + 30;
if ((tx > 5) && (tx < 59))
{
*x = tx;
*y = ty;
}
}
}
// -----------------------------------------------------------------------
// draw one frame of object...
void do_frame(void)
{
int px, py, pz; // 3d coordinates to rotate
int x, y, c; // 2d coordiantes of point and colour
int i = num_points; // loop counter
int j = MASK_SIZE;
char pel_buff[MASK_SIZE]; // frame buffer ( see draw_point() )
p_buff = &pel_buff[0];
while (j--) // erase pel buffer
{
pel_buff[j] = 32;
}
do_trails(); // clear pels that are 3 frames old
sincos(); // calculate all sin/cos values
while(i--)
{
px = object[i].x; // collect point from object
py = object[i].y;
pz = object[i].z;
rotate(&px, &py, &pz); // rotate this point about x/y and z axis
project(px, py, pz, &x, &y); // projection = convert xyz to xy
trail_1[i].x = x; // store frame history for all pels
trail_1[i].y = y; // of this frame
c = (((z_off - 90) / 14) & 15) < 1;
c -= ((-pz / 5) - 10);
draw_point(x, y, c);
}
}
// -----------------------------------------------------------------------
// adjust rotational speeds / distance between min and max for each
void modify(modifier *mod)
{
mod->counter--;
if (!mod->counter)
{
mod->counter = mod->reset;
*mod->ptr += mod->delta;
if (*mod->ptr >= mod->upper || *mod->ptr <= mod->lower)
{
mod->delta = -(mod->delta);
}
}
}
// -----------------------------------------------------------------------
// do the above on each of the 4 modifiers
void do_deltas(void)
{
modify(&w1); // modify x rotational speed
modify(&w2); // modify y rotational speed
modify(&w3); // modify z rotational speed
modify(&w4); // zoom object in and out
// modify(&w5); // not used because they make objects
// modify(&w6); // stay in the distance
}
// -----------------------------------------------------------------------
// adjust x y and z angles of ritation for next frame
void change_angles(void)
{
x_angle += delta_x;
y_angle += delta_y;
z_angle += delta_z;
x_angle &= 0x1ff;
y_angle &= 0x1ff;
z_angle &= 0x1ff;
}
// -----------------------------------------------------------------------
void do_demo(void)
{
while (1) // only way out is to die
{
while(--itters) // countdown to next shape change...
{ // shape change FORCED on entry
change_angles(); // adjust angles of rotation
do_frame(); // draw object
do_deltas(); // modify rotation speeds etc
RedrawWindow(); // lets see what weve drawn...
do_pending(); // quit / expose
usleep(50000); // erm... coders never sleep :)
}
itters = 2500; // should randomise this
object = obj_list[obj_number];
num_points = point_counts[obj_number++];
if (obj_number == NUM_OBJECTS)
{
obj_number = 0;
}
}
}
// -----------------------------------------------------------------------
// display version info and credits
void credits(void)
{
printf("\n");
printf("WM-Dots DEMO? version %s\n",Version);
printf(" by Mark I Manning IV\n\n");
printf("greets to follow soon....\n\n");
}
// sgore for helping me get star office :)
// -----------------------------------------------------------------------
// scan command line args
void scan_args(int argc,char **argv)
{
int i;
for (i = 0; i < argc; i++)
{
char *arg = argv[i];
if (*arg == '-')
{
switch (arg[1])
{
case 'v':
credits();
exit(0);
break;
default:
;
break;
}
}
}
}
// -----------------------------------------------------------------------
// main at BOTTOM of source so we have no EVIL forward refs!!
int main(int argc, char *argv[])
{
char mask[MASK_SIZE];
ProgName = argv[0];
if (strlen(ProgName) >= 5)
{
ProgName += (strlen(ProgName) - 5);
}
scan_args(argc, argv);
createXBMfromXPM(mask, master_xpm, MASK_WIDTH, MASK_HEIGHT);
openXwindow(argc, argv, master_xpm, mask, MASK_WIDTH, MASK_HEIGHT);
clear_histories(); // clear frame history buffers
do_demo(); // main = short and sweet :)
return(0); // never gets executed but lets get rid
} // of that stupid warning :)
// =======================================================================
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