X-Git-Url: http://git.hungrycats.org/cgi-bin/gitweb.cgi?p=xscreensaver;a=blobdiff_plain;f=hacks%2Fglx%2Fengine.c;h=4b9b1d4da76b6be07d93a61606db710bce6af53f;hp=58bf4a53d54defa16c07e18a102d6f36a92a444c;hb=40eacb5812ef7c0e3374fb139afbb4f5bc8bbfb5;hpb=2c902d6065f9856adf31e8540a94f1e42e68e905 diff --git a/hacks/glx/engine.c b/hacks/glx/engine.c index 58bf4a53..4b9b1d4d 100644 --- a/hacks/glx/engine.c +++ b/hacks/glx/engine.c @@ -1,9 +1,16 @@ /* * engine.c - GL representation of a 4 stroke engine * - * version 1.01 + * version 2.00 * * Copyright (C) 2001 Ben Buxton (bb@cactii.net) + * modified by Ed Beroset (beroset@mindspring.com) + * new to 2.0 version is: + * - command line argument to specify number of cylinders + * - command line argument to specify included angle of engine + * - removed broken command line argument to specify rotation speed + * - included crankshaft shapes and firing orders for real engines + * verified using the Bosch _Automotive Handbook_, 5th edition, pp 402,403 * * Permission to use, copy, modify, distribute, and sell this software and its * documentation for any purpose is hereby granted without fee, provided that @@ -22,16 +29,18 @@ # define HACK_INIT init_engine # define HACK_DRAW draw_engine # define HACK_HANDLE_EVENT engine_handle_event -# define HACK_RESHAPE reshape_engine +# define HACK_RESHAPE reshape_engine # define EVENT_MASK PointerMotionMask -# define engine_opts xlockmore_opts +# define engine_opts xlockmore_opts /* insert defaults here */ -#define DEFAULTS "*delay: 10000 \n" \ - "*showFPS: False \n" \ - "*move: True \n" \ - "*spin: True \n" \ - "*rotatespeed: 1\n" \ +#define DEF_ENGINE "(none)" + +#define DEFAULTS "*delay: 10000 \n" \ + "*showFPS: False \n" \ + "*move: True \n" \ + "*spin: True \n" \ + "*engine: " DEF_ENGINE "\n" \ # include "xlockmore.h" /* from the xscreensaver distribution */ #else /* !STANDALONE */ @@ -51,16 +60,19 @@ #include -static int rotatespeed; -static int move; -static int movepaused = 0; -static int spin; + #undef countof #define countof(x) (sizeof((x))/sizeof((*x))) +static int engineType; +static char *which_engine; +static int move; +static int movepaused = 0; +static int spin; + static XrmOptionDescRec opts[] = { - {"-rotate-speed", ".engine.rotatespeed", XrmoptionSepArg, "1" }, + {"-engine", ".engine.engine", XrmoptionSepArg, DEF_ENGINE }, {"-move", ".engine.move", XrmoptionNoArg, (caddr_t) "true" }, {"+move", ".engine.move", XrmoptionNoArg, (caddr_t) "false" }, {"-spin", ".engine.spin", XrmoptionNoArg, (caddr_t) "true" }, @@ -68,7 +80,7 @@ static XrmOptionDescRec opts[] = { }; static argtype vars[] = { - {(caddr_t *) &rotatespeed, "rotatespeed", "Rotatespeed", "1", t_Int}, + {(caddr_t *) &which_engine, "engine", "Engine", DEF_ENGINE, t_String}, {(caddr_t *) &move, "move", "Move", "True", t_Bool}, {(caddr_t *) &spin, "spin", "Spin", "True", t_Bool}, }; @@ -84,7 +96,6 @@ ModStruct engine_description = #endif - typedef struct { GLXContext *glx_context; Window window; @@ -110,10 +121,21 @@ static Engine *engine = NULL; #define M_PI 3.14159265 #endif +/* these defines are used to provide symbolic means + * by which to refer to various portions or multiples + * of a cyle in degrees + */ +#define HALFREV 180 +#define ONEREV 360 +#define TWOREV 720 + #define MOVE_MULT 0.05 #define RAND_RANGE(min, max) ((min) + (max - min) * f_rand()) +float crankOffset; +float crankWidth = 1.5; + int win_w, win_h; static GLfloat viewer[] = {0.0, 0.0, 30.0}; @@ -126,13 +148,122 @@ static GLfloat blue[] = {0, 0, 1, 1.0}; static GLfloat white[] = {1.0, 1, 1, 1.0}; static GLfloat yellow_t[] = {1, 1, 0, 0.4}; -void circle(float, int,int); GLvoid normal(GLfloat [], GLfloat [], GLfloat [], GLfloat *, GLfloat *, GLfloat *); -float sin_table[720]; -float cos_table[720]; -float tan_table[720]; +float sin_table[TWOREV]; +float cos_table[TWOREV]; +float tan_table[TWOREV]; + +/* + * this table represents both the firing order and included angle of engine. + * To simplify things, we always number from 0 starting at the flywheel and + * moving down the crankshaft toward the back of the engine. This doesn't + * always match manufacturer's schemes. For example, the Porsche 911 engine + * is a flat six with the following configuration (Porsche's numbering): + * + * 3 2 1 + * |= firing order is 1-6-2-4-3-5 in this diagram + * 6 5 4 + * + * We renumber these using our scheme but preserve the effective firing order: + * + * 0 2 4 + * |= firing order is 4-1-2-5-0-3 in this diagram + * 1 3 5 + * + * To avoid going completely insane, we also reorder these so the newly + * renumbered cylinder 0 is always first: 0-3-4-1-2-5 + * + * For a flat 6, the included angle is 180 degrees (0 would be a inline engine). + * Because these are all four-stroke engines, each piston goes through + * 720 degrees of rotation for each time the spark plug sparks, so in this case, + * we would use the following angles: + * cylinder firing order angle + * -------- ------------ ----- + * 0 0 0 + * 1 3 360 + * 2 4 240 + * 3 1 600 + * 4 2 480 + * 5 5 120 + * + */ + +typedef struct +{ + int cylinders; + int includedAngle; + int pistonAngle[12]; /* twelve cylinders should suffice... */ + int speed; /* step size in degrees for engine speed */ + const char *engineName; /* currently unused */ +} engine_type; + +engine_type engines[] = { + { 3, 0, { 0, 240, 480, 0, 0, 0, + 0, 0, 0, 0, 0, 0 }, 12, + "Honda Insight" }, + { 4, 0, { 0, 180, 540, 360, 0, 0, + 0, 0, 0, 0, 0, 0 }, 12, + "BMW M3" }, + { 4, 180, { 0, 360, 180, 540, 0, 0, + 0, 0, 0, 0, 0, 0 }, 12, + "VW Beetle" }, + { 5, 0, { 0, 576, 144, 432, 288, 0, + 0, 0, 0, 0, 0, 0 }, 12, + "Audi Quattro" }, + { 6, 0, { 0, 240, 480, 120, 600, 360, + 0, 0, 0, 0, 0, 0 }, 12, + "BMW M5" }, + { 6, 90, { 0, 360, 480, 120, 240, 600, + 0, 0, 0, 0, 0, 0 }, 12, + "Subaru XT" }, + { 6, 180, { 0, 360, 240, 600, 480, 120, + 0, 0, 0, 0, 0, 0 }, 12, + "Porsche 911" }, + { 8, 90, { 0, 450, 90, 180, 270, 360, + 540, 630, 0, 0, 0, 0 }, 15, + "Corvette Z06" }, + {10, 90, { 0, 72, 432, 504, 288, 360, + 144, 216, 576, 648, 0, 0 }, 12, + "Dodge Viper" }, + {12, 60, { 0, 300, 240, 540, 480, 60, + 120, 420, 600, 180, 360, 660 }, 12, + "Jaguar XKE" }, +}; + +/* this define is just a little shorter way of referring to members of the + * table above + */ +#define ENG engines[engineType] + +/* given a number of cylinders and an included angle, finds matching engine */ +int find_engine(const char *name) +{ + int i; + + if (!name || !*name || !strcasecmp (name, "(none)")) + return (random() % countof(engines)); + + for (i = 0; i < countof(engines); i++) { + if (!strcasecmp(name, engines[i].engineName)) + return i; + } + + fprintf (stderr, "%s: unknown engine type \"%s\"\n", progname, name); + fprintf (stderr, "%s: available models are:\n", progname); + for (i = 0; i < countof(engines); i++) { + fprintf (stderr, "\t %-13s (%d cylinders", + engines[i].engineName, engines[i].cylinders); + if (engines[i].includedAngle == 0) + fprintf (stderr, ")\n"); + else if (engines[i].includedAngle == 180) + fprintf (stderr, ", flat)\n"); + else + fprintf (stderr, ", V)\n"); + } + exit(1); +} /* we use trig tables to speed things up - 200 calls to sin() in one frame can be a bit harsh.. @@ -142,14 +273,14 @@ void make_tables(void) { int i; float f; - f = 360 / (M_PI * 2); - for (i = 0 ; i <= 720 ; i++) { + f = ONEREV / (M_PI * 2); + for (i = 0 ; i <= TWOREV ; i++) { sin_table[i] = sin(i/f); } - for (i = 0 ; i <= 720 ; i++) { + for (i = 0 ; i <= TWOREV ; i++) { cos_table[i] = cos(i/f); } - for (i = 0 ; i <= 720 ; i++) { + for (i = 0 ; i <= TWOREV ; i++) { tan_table[i] = tan(i/f); } } @@ -158,15 +289,15 @@ float f; /* for a tube, endcaps is 0 (none), 1 (left), 2 (right) or 3(both) */ /* angle is how far around the axis to go (up to 360) */ -void cylinder (GLfloat x, GLfloat y, GLfloat z, float length, float outer, float inner, int endcaps, int sang, - int eang) { +void cylinder (GLfloat x, GLfloat y, GLfloat z, + float length, float outer, float inner, int endcaps, int sang, int eang) { int a; /* current angle around cylinder */ int b = 0; /* previous */ int angle, norm, step, sangle; float z1, y1, z2, y2, ex=0; float y3, z3; float Z1, Y1, Z2, Y2, xl, Y3, Z3; -GLfloat y2c[720], z2c[720]; +GLfloat y2c[TWOREV], z2c[TWOREV]; GLfloat ony, onz; /* previous normals */ int nsegs, tube = 0; @@ -185,7 +316,7 @@ int nsegs, tube = 0; Y2 = y; xl = x + length; if (inner < outer && endcaps < 3) tube = 1; - step = 360/nsegs; + step = ONEREV/nsegs; glBegin(GL_QUADS); for (a = sangle ; a <= angle || b <= angle ; a+= step) { @@ -207,7 +338,7 @@ int nsegs, tube = 0; glNormal3f(0, y2, z2); glVertex3f(xl,y2,z2); glVertex3f(x,y2,z2); - if (a == sangle && angle - sangle < 360) { + if (a == sangle && angle - sangle < ONEREV) { if (tube) glVertex3f(x, Y1, Z1); else @@ -250,7 +381,7 @@ int nsegs, tube = 0; } glEnd(); - if (angle - sangle < 360) { + if (angle - sangle < ONEREV) { GLfloat nx, ny, nz; GLfloat v1[3], v2[3], v3[3]; v1[0] = x; v1[1] = y; v1[2] = z; @@ -286,7 +417,7 @@ int nsegs, tube = 0; for(ex = start ; ex <= end ; ex += length) { z1 = outer*cos_table[sangle]+z; y1 = y+sin_table[sangle]*outer; - step = 360/nsegs; + step = ONEREV/nsegs; glBegin(GL_TRIANGLES); b = 0; for (a = sangle ; a <= angle || b <= angle; a+= step) { @@ -304,6 +435,11 @@ int nsegs, tube = 0; glPopMatrix(); } +/* this is just a convenience function to make a solid rod */ +void rod (GLfloat x, GLfloat y, GLfloat z, float length, float diameter) { + cylinder(x, y, z, length, diameter, diameter, 3, 0, ONEREV); +} + GLvoid normal(GLfloat v1[], GLfloat v2[], GLfloat v3[], GLfloat *nx, GLfloat *ny, GLfloat *nz) { @@ -324,61 +460,6 @@ GLvoid normal(GLfloat v1[], GLfloat v2[], GLfloat v3[], -void circle(float radius, int segments, int half) { -float x1 = 0, x2 = 0; -float y1 = 0, y2 = 0; -int i, t, s; - - if (half) { - t = 270; s = 90; - x1 = radius, y1 = 0; - } else { - t = 360, s = 0; - } - glBegin(GL_TRIANGLES); - glNormal3f(1, 0, 0); - for(i=s;i<=t;i+=10) - { - float angle=i; - x2=radius*(float)cos_table[(int)angle]; - y2=radius*(float)sin_table[(int)angle]; - glVertex3f(0,0,0); - glVertex3f(x1,y1,0); - glVertex3f(x2,y2,0); - x1=x2; - y1=y2; - } - glEnd(); -} - -void ring(GLfloat inner, GLfloat outer, int nsegs) { -GLfloat z1, z2, y1, y2; -GLfloat Z1, Z2, Y1, Y2; -int i; - - z1 = inner; y1 = 0; - Z1 = outer; Y1 = 0; - glBegin(GL_QUADS); - glNormal3f(1, 0, 0); - for(i=0; i <=360 ; i+= 360/nsegs) - { - float angle=i; - z2=inner*(float)sin_table[(int)angle]; - y2=inner*(float)cos_table[(int)angle]; - Z2=outer*(float)sin_table[(int)angle]; - Y2=outer*(float)cos_table[(int)angle]; - glVertex3f(0, Y1, Z1); - glVertex3f(0, y1, z1); - glVertex3f(0, y2, z2); - glVertex3f(0, Y2, Z2); - z1=z2; - y1=y2; - Z1=Z2; - Y1=Y2; - } - glEnd(); -} - void Rect(GLfloat x, GLfloat y, GLfloat z, GLfloat w, GLfloat h, GLfloat t) { GLfloat yh; @@ -436,22 +517,24 @@ int i; glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, colour); glMaterialfv(GL_FRONT, GL_SPECULAR, colour); glMateriali(GL_FRONT, GL_SHININESS, 20); - cylinder(0, 0, 0, 2, 1, 0.7, 2, 0, 360); /* body */ + cylinder(0, 0, 0, 2, 1, 0.7, 2, 0, ONEREV); /* body */ colour[0] = colour[1] = colour[2] = 0.2; glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, colour); - cylinder(1.6, 0, 0, 0.1, 1.05, 1.05, 0, 0, 360); /* ring */ - cylinder(1.8, 0, 0, 0.1, 1.05, 1.05, 0, 0, 360); /* ring */ + cylinder(1.6, 0, 0, 0.1, 1.05, 1.05, 0, 0, ONEREV); /* ring */ + cylinder(1.8, 0, 0, 0.1, 1.05, 1.05, 0, 0, ONEREV); /* ring */ glEndList(); } -void CrankBit(GLfloat x, GLfloat y, GLfloat z) { - Rect(x, y, z, 0.2, 1.8, 1); +void CrankBit(GLfloat x) { + Rect(x, -1.4, 0.5, 0.2, 1.8, 1); + cylinder(x, -0.5, 0, 0.2, 2, 2, 1, 60, 120); } void boom(GLfloat x, GLfloat y, int s) { static GLfloat red[] = {0, 0, 0, 0.9}; static GLfloat lpos[] = {0, 0, 0, 1}; static GLfloat d = 0, wd; +int flameOut = 720/ENG.speed/ENG.cylinders; static int time = 0; if (time == 0 && s) { @@ -461,11 +544,11 @@ static int time = 0; glEnable(GL_LIGHT1); } else if (time == 0 && !s) { return; - } else if (time >= 8 && time < 16 && !s) { + } else if (time >= 8 && time < flameOut && !s) { time++; red[0] -= 0.2; red[1] -= 0.1; d-= 0.04; - } else if (time >= 16) { + } else if (time >= flameOut) { time = 0; glDisable(GL_LIGHT1); return; @@ -474,7 +557,7 @@ static int time = 0; d+= 0.04; time++; } - lpos[0] = x; lpos[1] = y-d; + lpos[0] = x-d; lpos[1] = y; glLightfv(GL_LIGHT1, GL_POSITION, lpos); glLightfv(GL_LIGHT1, GL_DIFFUSE, red); glLightfv(GL_LIGHT1, GL_SPECULAR, red); @@ -482,17 +565,14 @@ static int time = 0; glLighti(GL_LIGHT1, GL_CONSTANT_ATTENUATION, 0); glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red); - glPushMatrix(); - glRotatef(90, 0, 0, 1); wd = d*3; if (wd > 0.7) wd = 0.7; glEnable(GL_BLEND); glDepthMask(GL_FALSE); glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); - cylinder(y-d, -x, 0, d, wd, wd, 1, 0, 360); + rod(x, y, 0, d, wd); glDepthMask(GL_TRUE); glDisable(GL_BLEND); - glPopMatrix(); } void display(Engine *e) { @@ -501,12 +581,17 @@ static int a = 0; GLfloat zb, yb; static GLfloat ln[730], yp[730], ang[730]; static int ln_init = 0; -static int spark; +static int lastPlug = 0; +int half; +int sides; +int j, b; +static float rightSide; glEnable(GL_LIGHTING); glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); glLoadIdentity(); - gluLookAt(viewer[0], viewer[1], viewer[2], lookat[0], lookat[1], lookat[2], 0.0, 1.0, 0.0); + gluLookAt(viewer[0], viewer[1], viewer[2], lookat[0], lookat[1], lookat[2], + 0.0, 1.0, 0.0); glPushMatrix(); glLightfv(GL_LIGHT0, GL_POSITION, lightpos); glLightfv(GL_LIGHT0, GL_SPECULAR, light_sp); @@ -521,9 +606,9 @@ static int spark; double x, y, z; gltrackball_rotate (e->trackball); get_rotation(e->rot, &x, &y, &z, !e->button_down_p); - glRotatef(x*360, 1.0, 0.0, 0.0); - glRotatef(y*360, 0.0, 1.0, 0.0); - glRotatef(x*360, 0.0, 0.0, 1.0); + glRotatef(x*ONEREV, 1.0, 0.0, 0.0); + glRotatef(y*ONEREV, 0.0, 1.0, 0.0); + glRotatef(x*ONEREV, 0.0, 0.0, 1.0); } /* So the rotation appears around the centre of the engine */ @@ -540,169 +625,172 @@ static int spark; for (ln_init = 0 ; ln_init < 730 ; ln_init++) { zb = sin_table[ln_init]; yb = cos_table[ln_init]; - yp[ln_init] = yb + sqrt(25 - (zb*zb)); /* y ordinate of piston */ - ln[ln_init] = sqrt(zb*zb + (yb-yp[ln_init])*(yb-yp[ln_init])); /* length of rod */ - ang[ln_init] = asin(zb/5)*57; /* angle of connecting rod */ + /* y ordinate of piston */ + yp[ln_init] = yb + sqrt(25 - (zb*zb)); + /* length of rod */ + ln[ln_init] = sqrt(zb*zb + (yb-yp[ln_init])*(yb-yp[ln_init])); + /* angle of connecting rod */ + ang[ln_init] = asin(zb/5)*57; ang[ln_init] *= -1; } } - zb = sin_table[a]; - yb = cos_table[a]; - -/* pistons */ - glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, white); - glPushMatrix(); - glTranslatef(0, yp[a]-0.3, 0); - glCallList(2); - glPopMatrix(); - glPushMatrix(); - glTranslatef(3.2, yp[(a > 180 ? a-180 : a+180)]-0.3, 0); - glCallList(2); - glPopMatrix(); - glPushMatrix(); - glTranslatef(6.5, yp[a]-0.3, 0); - glCallList(2); - glPopMatrix(); glPushMatrix(); - glTranslatef(9.8, yp[(a > 180 ? a-180 : a+180)]-0.3, 0); - glCallList(2); - glPopMatrix(); - -/* spark plugs */ - glPushMatrix(); - glRotatef(90, 0, 0, 1); - glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red); - cylinder(8.5, 0, 0, 0.5, 0.4, 0.3, 1, 0, 360); - cylinder(8.5, -3.2, 0, 0.5, 0.4, 0.3, 1, 0, 360); - cylinder(8.5, -6.5, 0, 0.5, 0.4, 0.3, 1, 0, 360); - cylinder(8.5, -9.8, 0, 0.5, 0.4, 0.3, 1, 0, 360); - - glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, white); - cylinder(8, 0, 0, 0.5, 0.2, 0.2, 1, 0, 360); - cylinder(8, -3.2, 0, 0.5, 0.2, 0.2, 1, 0, 360); - cylinder(8, -6.5, 0, 0.5, 0.2, 0.2, 1, 0, 360); - cylinder(8, -9.8, 0, 0.5, 0.2, 0.2, 1, 0, 360); - - glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, white); - cylinder(9, 0, 0, 1, 0.15, 0.15, 1, 0, 360); - cylinder(9, -3.2, 0, 1, 0.15, 0.15, 1, 0, 360); - cylinder(9, -6.5, 0, 1, 0.15, 0.15, 1, 0, 360); - cylinder(9, -9.8, 0, 1, 0.15, 0.15, 1, 0, 360); - - glPopMatrix(); - - if (a == 0) spark = 1 - spark; - - if (spark == 0) { - if (a == 0) - boom(0, 8, 1); - else if (a == 180) - boom(3.2, 8, 1); - if (a < 180) - boom(0, 8, 0); - else if (a < 360) - boom(3.2, 8, 0); - } else { - if (a == 0) - boom(6.5, 8, 1); - else if (a == 180) - boom(9.8, 8, 1); - if (a < 180) - boom(6.5, 8, 0); - else if (a < 360) - boom(9.8, 8, 0); + sides = (ENG.includedAngle == 0) ? 1 : 2; + for (half = 0; half < sides; half++, glRotatef(ENG.includedAngle,1,0,0)) + { + /* pistons */ + /* glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, white); */ + for (j = 0; j < ENG.cylinders; j += sides) + { + b = (a + ENG.pistonAngle[j+half]) % ONEREV; + glPushMatrix(); + glTranslatef(crankWidth/2 + crankOffset*(j+half), yp[b]-0.3, 0); + glCallList(2); + glPopMatrix(); + } + /* spark plugs */ + glPushMatrix(); + glRotatef(90, 0, 0, 1); + glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red); + for (j = 0; j < ENG.cylinders; j += sides) + { + cylinder(8.5, -crankWidth/2-crankOffset*(j+half), 0, + 0.5, 0.4, 0.3, 1, 0, ONEREV); + } + glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, white); + for (j = 0; j < ENG.cylinders; j += sides) + { + rod(8, -crankWidth/2-crankOffset*(j+half), 0, 0.5, 0.2); + rod(9, -crankWidth/2-crankOffset*(j+half), 0, 1, 0.15); + } + + /* rod */ + glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue); + for (j = 0; j < ENG.cylinders; j += sides) + { + b = (a+HALFREV+ENG.pistonAngle[j+half]) % TWOREV; + glPushMatrix(); + glRotatef(ang[b], 0, 1, 0); + rod(-cos_table[b], -crankWidth/2-crankOffset*(j+half), -sin_table[b], + ln[b], 0.2); + glPopMatrix(); + } + glPopMatrix(); + + /* engine block */ + glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, yellow_t); + glEnable(GL_BLEND); + glDepthMask(GL_FALSE); + glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); + rightSide = (sides > 1) ? 0 : 1.6; + /* left plate */ + Rect(-crankWidth/2, -0.5, 1, 0.2, 9, 2); + /* right plate */ + Rect(0.3+crankOffset*ENG.cylinders-rightSide, -0.5, 1, 0.2, 9, 2); + /* head plate */ + Rect(-crankWidth/2+0.2, 8.3, 1, + crankWidth/2+0.1+crankOffset*ENG.cylinders-rightSide, 0.2, 2); + /* front rail */ + Rect(-crankWidth/2+0.2, 3, 1, + crankWidth/2+0.1+crankOffset*ENG.cylinders-rightSide, 0.2, 0.2); + /* back rail */ + Rect(-crankWidth/2+0.2, 3, -1+0.2, + crankWidth/2+0.1+crankOffset*ENG.cylinders-rightSide, 0.2, 0.2); + /* plates between cylinders */ + for (j=0; j < ENG.cylinders - (sides == 1); j += sides) + Rect(0.4+crankWidth+crankOffset*(j-half), 3, 1, 1, 5.3, 2); + glDepthMask(GL_TRUE); } - - - - glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue); - glPushMatrix(); - cylinder(-0.8, yb, zb, 1.6, 0.3, 0.3, 1, 0, 365); - cylinder(5.7, yb, zb, 1.7, 0.3, 0.3, 1, 0, 365); - - cylinder(2.4, -yb, -zb, 1.7, 0.3, 0.3, 1, 0, 365); - cylinder(9.0, -yb, -zb, 1.7, 0.3, 0.3, 1, 0, 365); - glPopMatrix(); - - /* rod */ - glPushMatrix(); - glRotatef(90, 0, 0, 1); - glRotatef(ang[a], 0, -1, 0); - cylinder(yb, 0, zb, ln[a], 0.2, 0.2, 0, 0, 365); - cylinder(yb, -6.4, zb, ln[a], 0.2, 0.2, 0, 0, 365); - glPopMatrix(); - - glPushMatrix(); - glRotatef(90, 0, 0, 1); - glRotatef(ang[a+180], 0, -1, 0); - cylinder(-yb, -3.2, -zb, ln[a], 0.2, 0.2, 0, 0, 365); - cylinder(-yb, -9.7, -zb, ln[a], 0.2, 0.2, 0, 0, 365); glPopMatrix(); + /* see which of our plugs should fire now, if any */ + for (j = 0; j < ENG.cylinders; j++) + { + if (0 == ((a + ENG.pistonAngle[j]) % TWOREV)) + { + glPushMatrix(); + if (j & 1) + glRotatef(ENG.includedAngle,1,0,0); + glRotatef(90, 0, 0, 1); + boom(8, -crankWidth/2-crankOffset*j, 1); + lastPlug = j; + glPopMatrix(); + } + } - glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, yellow_t); - glEnable(GL_BLEND); - glDepthMask(GL_FALSE); - glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); - - Rect(-1, 8.3, 1, 12, 0.2, 2); - Rect(-1.2, -0.5, 1, 0.2, 9, 2); - - Rect(1.4, 3, 1, 0.6, 5.3, 2); - Rect(4.4, 3, 1, 1, 5.3, 2); - Rect(7.7, 3, 1, 0.8, 5.3, 2); - Rect(10.8, -0.5, 1, 0.2, 8.8, 2); - - Rect(-1, 2.8, 1, 12, 0.2, 0.2); - Rect(-1, 2.8, -1, 12, 0.2, 0.2); - - glDepthMask(GL_TRUE); + if (lastPlug != j) + { + /* this code causes the last plug explosion to dim gradually */ + if (lastPlug & 1) + glRotatef(ENG.includedAngle, 1, 0, 0); + glRotatef(90, 0, 0, 1); + boom(8, -crankWidth/2-crankOffset*lastPlug, 0); + } glDisable(GL_BLEND); - - a+=10; if (a >= 360) a = 0; + a += ENG.speed; + if (a >= TWOREV) + a = 0; glPopMatrix(); glFlush(); } void makeshaft (void) { int i; +int j; +const static float crankThick = 0.2; +const static float crankDiam = 0.3; + i = glGenLists(1); glNewList(i, GL_COMPILE); - cylinder(10.4, 0, 0, 2, 0.3, 0.3, 1, 0, 365); - cylinder(7.1, 0, 0, 2, 0.3, 0.3, 0, 0, 365); - cylinder(3.8, 0, 0, 2, 0.3, 0.3, 0, 0, 365); - cylinder(0.5, 0, 0, 2, 0.3, 0.3, 0, 0, 365); - cylinder(-1.5, 0, 0, 1, 0.3, 0.3, 1, 0, 365); - - cylinder(12.4, 0, 0, 1, 3, 2.5, 0, 0, 365); - Rect(12.4, -0.3, 2.8, 0.5, 0.6, 5.6); - Rect(12.4, -2.8, 0.3, 0.5, 5.6, 0.6); - - glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green); - CrankBit(0.5, -0.4, 0.5); - cylinder(0.5, 0.5, 0, 0.2, 2, 2, 1, 240, 300); - CrankBit(-0.7, -0.4, 0.5); - cylinder(-0.7, 0.5, 0, 0.2, 2, 2, 1, 240, 300); - - CrankBit(2.5, -1.4, 0.5); - cylinder(2.5, -0.5, 0, 0.2, 2, 2, 1, 60, 120); - CrankBit(3.8, -1.4, 0.5); - cylinder(3.8, -0.5, 0, 0.2, 2, 2, 1, 60, 120); - - CrankBit(5.8, -0.4, 0.5); - cylinder(5.8, 0.5, 0, 0.2, 2, 2, 1, 240, 300); - CrankBit(7.1, -0.4, 0.5); - cylinder(7.1, 0.5, 0, 0.2, 2, 2, 1, 240, 300); - - CrankBit(9.1, -1.4, 0.5); - cylinder(9.1, -0.5, 0, 0.2, 2, 2, 1, 60, 120); - CrankBit(10.4, -1.4, 0.5); - cylinder(10.4, -0.5, 0, 0.2, 2, 2, 1, 60, 120); + glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue); + /* draw the flywheel */ + cylinder(-2.5, 0, 0, 1, 3, 2.5, 0, 0, ONEREV); + Rect(-2, -0.3, 2.8, 0.5, 0.6, 5.6); + Rect(-2, -2.8, 0.3, 0.5, 5.6, 0.6); + + /* now make each of the shaft bits between the cranks, + * starting from the flywheel end which is at X-coord 0. + * the first cranskhaft bit is always 2 units long + */ + rod(-2, 0, 0, 2, crankDiam); + + /* Each crank is crankWidth units wide and the total width of a cylinder assembly + * is 3.3 units. For inline engines, there is just a single crank per cylinder + * width. For other engine configurations, there is a crank between each pair + * of adjacent cylinders on one side of the engine, so the crankOffset length is + * halved. + */ + crankOffset = 3.3; + if (ENG.includedAngle != 0) + crankOffset /= 2; + for (j = 0; j < ENG.cylinders - 1; j++) + rod(crankWidth - crankThick + crankOffset*j, 0, 0, + crankOffset - crankWidth + 2 * crankThick, crankDiam); + /* the last bit connects to the engine wall on the non-flywheel end */ + rod(crankWidth - crankThick + crankOffset*j, 0, 0, 0.9, crankDiam); + + + for (j = 0; j < ENG.cylinders; j++) + { + glPushMatrix(); + if (j & 1) + glRotatef(HALFREV+ENG.pistonAngle[j]+ENG.includedAngle,1,0,0); + else + glRotatef(HALFREV+ENG.pistonAngle[j],1,0,0); + /* draw wrist pin */ + glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue); + rod(crankOffset*j, -1.0, 0.0, crankWidth, crankDiam); + glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green); + /* draw right part of crank */ + CrankBit(crankOffset*j); + /* draw left part of crank */ + CrankBit(crankWidth-crankThick+crankOffset*j); + glPopMatrix(); + } glEndList(); - } void reshape_engine(ModeInfo *mi, int width, int height) @@ -738,8 +826,9 @@ Engine *e; e->dy = (float)(random() % 1000)/30000; e->dz = (float)(random() % 1000)/30000; } else { - viewer[0] = 0; viewer[1] = 6; viewer[2] = 15; - lookat[0] = 0; lookat[1] = 4; lookat[2] = 0; + viewer[0] = 0; viewer[1] = 2; viewer[2] = 18; + lookat[0] = 0; lookat[1] = 0; lookat[2] = 0; + } if (spin) { e->da = (float)(random() % 1000)/125 - 4; @@ -775,6 +864,7 @@ Engine *e; glEnable(GL_LIGHT0); glEnable(GL_NORMALIZE); make_tables(); + engineType = find_engine(which_engine); makeshaft(); makepiston(); }