Original 5.40

1 files changed, 971 insertions, 0 deletions

diff --git a/hacks/glx/endgame.c b/hacks/glx/endgame.c
new file mode 100644
index 0000000..ddba7f9
--- /dev/null
+++ b/hacks/glx/endgame.c
@@ -0,0 +1,971 @@
+/*
+ * endgame.c
+ * plays through a chess game ending.  enjoy.
+ *
+ * version 1.0 - June 6, 2002
+ *
+ * Copyright (C) 2002-2008 Blair Tennessy (tennessb@unbc.ca)
+ *
+ * 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.
+ */
+
+#ifdef STANDALONE
+#define DEFAULTS       "*delay:     20000 \n" \
+                       "*showFPS:   False \n" \
+		       "*wireframe: False \n" \
+
+# define free_chess 0
+# define release_chess 0
+# include "xlockmore.h"
+
+#else
+# include "xlock.h"
+#endif
+
+#ifdef USE_GL
+
+#define BOARDSIZE 8
+#define WHITES 5
+
+#include "gltrackball.h"
+#include "chessmodels.h"
+#include "chessgames.h"
+
+#undef countof
+#define countof(x) (sizeof((x))/sizeof((*x)))
+
+#define DEF_ROTATE      "True"
+#define DEF_REFLECTIONS "True"
+#define DEF_SHADOWS     "True"
+#define DEF_SMOOTH      "True"
+#define DEF_CLASSIC     "False"
+
+
+static XrmOptionDescRec opts[] = {
+  {"+rotate", ".chess.rotate", XrmoptionNoArg, "false" },
+  {"-rotate", ".chess.rotate", XrmoptionNoArg, "true" },
+  {"+reflections", ".chess.reflections", XrmoptionNoArg, "false" },
+  {"-reflections", ".chess.reflections", XrmoptionNoArg, "true" },
+  {"+shadows", ".chess.shadows", XrmoptionNoArg, "false" },
+  {"-shadows", ".chess.shadows", XrmoptionNoArg, "true" },
+  {"+smooth", ".chess.smooth", XrmoptionNoArg, "false" },
+  {"-smooth", ".chess.smooth", XrmoptionNoArg, "true" },
+  {"+classic", ".chess.classic", XrmoptionNoArg, "false" },
+  {"-classic", ".chess.classic", XrmoptionNoArg, "true" },
+};
+
+static int rotate, reflections, smooth, shadows, classic;
+
+static argtype vars[] = {
+  {&rotate,      "rotate",      "Rotate",      DEF_ROTATE, t_Bool},
+  {&reflections, "reflections", "Reflections", DEF_REFLECTIONS, t_Bool},
+  {&shadows,	 "shadows",	 "Shadows",    DEF_SHADOWS, t_Bool},
+  {&smooth,      "smooth",      "Smooth",      DEF_SMOOTH, t_Bool},
+  {&classic,     "classic",     "Classic",     DEF_CLASSIC, t_Bool},
+};
+
+ENTRYPOINT ModeSpecOpt chess_opts = {countof(opts), opts, countof(vars), vars, NULL};
+
+#ifdef USE_MODULES
+ModStruct   chess_description =
+{"chess", "init_chess", "draw_chess", NULL,
+ "draw_chess", "init_chess", NULL, &chess_opts,
+ 1000, 1, 2, 1, 4, 1.0, "",
+ "Chess", 0, NULL};
+
+#endif
+
+#define checkImageWidth 16
+#define checkImageHeight 16
+
+typedef struct {
+  GLXContext *glx_context;
+  Window window;
+  trackball_state *trackball;
+  Bool button_down_p;
+
+  ChessGame game;
+  int oldwhite;
+
+  /** definition of white/black (orange/gray) colors */
+  GLfloat colors[2][3];
+
+  GLubyte checkImage[checkImageWidth][checkImageHeight][3];
+  GLuint piecetexture, boardtexture;
+
+  int mpiece, tpiece, steps, done;
+  double from[2], to[2];
+  double dx, dz;
+  int moving, take, mc, count, wire;
+  double theta;
+
+  GLfloat position[4];
+  GLfloat position2[4];
+
+  GLfloat mod;
+
+  GLfloat ground[4];
+
+  int oldgame;
+
+  int poly_counts[PIECES];  /* polygon count of each type of piece */
+
+
+} Chesscreen;
+
+static Chesscreen *qs = NULL;
+
+static const GLfloat MaterialShadow[] =   {0.0, 0.0, 0.0, 0.3};
+
+
+/* i prefer silvertip */
+static const GLfloat whites[WHITES][3] = 
+  {
+    {1.0, 0.55, 0.1},
+    {0.8, 0.52, 0.8},
+    {0.43, 0.54, 0.76},
+    {0.2, 0.2, 0.2},
+    {0.35, 0.60, 0.35},
+  };
+
+static void build_colors(Chesscreen *cs) 
+{
+
+  /* find new white */
+  int newwhite = cs->oldwhite;
+  while(newwhite == cs->oldwhite)
+    newwhite = random()%WHITES;
+  cs->oldwhite = newwhite;
+
+  cs->colors[0][0] = whites[cs->oldwhite][0];
+  cs->colors[0][1] = whites[cs->oldwhite][1];
+  cs->colors[0][2] = whites[cs->oldwhite][2];
+}
+
+/* build piece texture */
+static void make_piece_texture(Chesscreen *cs) 
+{
+  int i, j, c;
+
+  for (i = 0; i < checkImageWidth; i++) {
+    for (j = 0; j < checkImageHeight; j++) {
+      c = ((j%2) == 0 || i%2 == 0) ? 240 : 180+random()%16;
+      cs->checkImage[i][j][0] = (GLubyte) c;
+      cs->checkImage[i][j][1] = (GLubyte) c;
+      cs->checkImage[i][j][2] = (GLubyte) c;
+    }
+  }
+
+  glGenTextures(1, &cs->piecetexture);
+  glBindTexture(GL_TEXTURE_2D, cs->piecetexture);
+
+  glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
+  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);
+  glTexImage2D(GL_TEXTURE_2D, 0, 3, checkImageWidth, 
+	       checkImageHeight, 0, GL_RGB, GL_UNSIGNED_BYTE, 
+	       &cs->checkImage[0][0]);
+}
+
+/* build board texture (uniform noise in [180,180+50]) */
+static void make_board_texture(Chesscreen *cs) 
+{
+  int i, j, c;
+
+  for (i = 0; i < checkImageWidth; i++) {
+    for (j = 0; j < checkImageHeight; j++) {
+      c = 180 + random()%51;
+      cs->checkImage[i][j][0] = (GLubyte) c;
+      cs->checkImage[i][j][1] = (GLubyte) c;
+      cs->checkImage[i][j][2] = (GLubyte) c;
+    }
+  }
+
+  glGenTextures(1, &cs->boardtexture);
+  glBindTexture(GL_TEXTURE_2D, cs->boardtexture);
+
+  glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
+  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);
+  glTexImage2D(GL_TEXTURE_2D, 0, 3, checkImageWidth, 
+	       checkImageHeight, 0, GL_RGB, GL_UNSIGNED_BYTE, 
+	       &cs->checkImage[0][0]);
+}
+
+/** handle X event (trackball) */
+ENTRYPOINT Bool chess_handle_event (ModeInfo *mi, XEvent *event) 
+{
+  Chesscreen *cs = &qs[MI_SCREEN(mi)];
+
+  if (gltrackball_event_handler (event, cs->trackball,
+                                 MI_WIDTH (mi), MI_HEIGHT (mi),
+                                 &cs->button_down_p))
+    return True;
+  else if (screenhack_event_helper (MI_DISPLAY(mi), MI_WINDOW(mi), event))
+    {
+      cs->done = 1;
+      return True;
+    }
+ 
+  return False;
+}
+
+static const GLfloat diffuse2[] = {1.0, 1.0, 1.0, 1.0};
+/*static const GLfloat ambient2[] = {0.7, 0.7, 0.7, 1.0};*/
+static const GLfloat shininess[] = {60.0};
+static const GLfloat specular[] = {0.4, 0.4, 0.4, 1.0};
+
+/* configure lighting */
+static void setup_lights(Chesscreen *cs) 
+{
+  glEnable(GL_LIGHTING);
+  glLightfv(GL_LIGHT0, GL_POSITION, cs->position);
+  glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse2);
+  glEnable(GL_LIGHT0);
+
+/*   glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambient2); */
+
+  glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, shininess);
+  glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, specular);
+
+  glLightfv(GL_LIGHT1, GL_SPECULAR, diffuse2);
+  glLightfv(GL_LIGHT1, GL_DIFFUSE, diffuse2);
+  glEnable(GL_LIGHT1);
+}
+
+/* draw pieces */
+static void drawPieces(ModeInfo *mi, Chesscreen *cs) 
+{
+  int i, j;
+
+  for(i = 0; i < BOARDSIZE; ++i) {
+    for(j = 0; j < BOARDSIZE; ++j) {
+      if(cs->game.board[i][j]) {	
+	int c = cs->game.board[i][j]/PIECES;
+	glColor3fv(cs->colors[c]);
+	glCallList(cs->game.board[i][j]%PIECES);
+        mi->polygon_count += cs->poly_counts[cs->game.board[i][j]%PIECES];
+      }
+      
+      glTranslatef(1.0, 0.0, 0.0);
+    }
+    
+    glTranslatef(-1.0*BOARDSIZE, 0.0, 1.0);
+  }
+
+  glTranslatef(0.0, 0.0, -1.0*BOARDSIZE);
+}
+
+/* draw pieces */
+static void drawPiecesShadow(ModeInfo *mi, Chesscreen *cs) 
+{
+  int i, j;
+
+  for(i = 0; i < BOARDSIZE; ++i) {
+    for(j = 0; j < BOARDSIZE; ++j) {
+      if(cs->game.board[i][j]) {	
+	glColor4f(0.0, 0.0, 0.0, 0.4);
+	glCallList(cs->game.board[i][j]%PIECES);
+        mi->polygon_count += cs->poly_counts[cs->game.board[i][j]%PIECES];
+      }
+      
+      glTranslatef(1.0, 0.0, 0.0);
+    }
+    
+    glTranslatef(-1.0*BOARDSIZE, 0.0, 1.0);
+  }
+
+  glTranslatef(0.0, 0.0, -1.0*BOARDSIZE);
+}
+
+/* draw a moving piece */
+static void drawMovingPiece(ModeInfo *mi, Chesscreen *cs, int shadow) 
+{
+  int piece = cs->mpiece % PIECES;
+
+  if (piece == NONE) return;
+
+  glPushMatrix();
+
+  if(shadow) glColor4fv(MaterialShadow);
+  else glColor3fv(cs->colors[cs->mpiece/PIECES]);
+
+  /** assume a queening.  should be more general */
+  if((cs->mpiece == PAWN  && fabs(cs->to[0]) < 0.01) || 
+     (cs->mpiece == BPAWN && fabs(cs->to[0]-7.0) < 0.01)) {
+    glTranslatef(cs->from[1]+cs->steps*cs->dx, 0.0, cs->from[0]+cs->steps*cs->dz);
+
+    glColor4f(shadow ? MaterialShadow[0] : cs->colors[cs->mpiece/7][0], 
+	      shadow ? MaterialShadow[1] : cs->colors[cs->mpiece/7][1], 
+	      shadow ? MaterialShadow[2] : cs->colors[cs->mpiece/7][2],
+	      (fabs(50.0-cs->steps))/50.0);
+
+    piece = cs->steps < 50 ? PAWN : QUEEN;
+
+    /* what a kludge */
+    if(cs->steps == 99)
+      cs->mpiece = cs->mpiece == PAWN ? QUEEN : BQUEEN;
+  }
+  else if(cs->mpiece % PIECES == KNIGHT) {
+    /* If there is nothing in the path of a knight, move it by sliding,
+       just like the other pieces.  But if there are any pieces on the
+       middle two squares in its path, the knight would intersect them,
+       so in that case, move it in an airborne arc. */
+    GLfloat y;
+    int i, j;
+    Bool blocked_p = False;
+    int fromx = MIN(cs->from[1], cs->to[1]);
+    int fromy = MIN(cs->from[0], cs->to[0]);
+    int tox   = MAX(cs->from[1], cs->to[1]);
+    int toy   = MAX(cs->from[0], cs->to[0]);
+    if (fromx == tox-2) fromx = tox = fromx+1;
+    if (fromy == toy-2) fromy = toy = fromy+1;
+    for (i = fromy; i <= toy; i++) {
+      for (j = fromx; j <= tox; j++) {
+        if (cs->game.board[i][j]) {
+          blocked_p = True;
+          break;
+        }
+      }
+    }
+
+    if (!blocked_p)
+      goto SLIDE;
+
+    /* Move by hopping. */
+    y = 1.5 * sin (M_PI * cs->steps / 100.0);
+    glTranslatef(cs->from[1]+cs->steps*cs->dx, y,
+                 cs->from[0]+cs->steps*cs->dz);
+
+  } else {
+  SLIDE:
+    /* Move by sliding. */
+    glTranslatef(cs->from[1]+cs->steps*cs->dx, 0.0, cs->from[0]+cs->steps*cs->dz);
+  }
+
+
+  if(!cs->wire)
+    glEnable(GL_BLEND);
+  
+  glCallList(piece);
+  mi->polygon_count += cs->poly_counts[cs->mpiece % PIECES];
+
+  glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, shininess);
+  glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, specular);
+
+  glPopMatrix();
+
+  if(!cs->wire)
+    glDisable(GL_BLEND);
+}
+
+/** code to squish a taken piece */
+static void drawTakePiece(ModeInfo *mi, Chesscreen *cs, int shadow) 
+{
+  if(!cs->wire)
+    glEnable(GL_BLEND);
+
+  glColor4f(shadow ? MaterialShadow[0] : cs->colors[cs->tpiece/7][0], 
+	    shadow ? MaterialShadow[1] : cs->colors[cs->tpiece/7][1], 
+	    shadow ? MaterialShadow[2] : cs->colors[cs->tpiece/7][2],
+            (100-1.6*cs->steps)/100.0);
+
+  glTranslatef(cs->to[1], 0.0, cs->to[0]);
+  
+  if(cs->mpiece % PIECES == KNIGHT)
+    glScalef(1.0+cs->steps/100.0, 1.0, 1.0+cs->steps/100.0);
+  else
+    glScalef(1.0, 1 - cs->steps/50.0 > 0.01 ? 1 - cs->steps/50.0 : 0.01, 1.0);
+  glCallList(cs->tpiece % 7);
+  mi->polygon_count += cs->poly_counts[cs->tpiece % PIECES];
+  
+  if(!cs->wire)
+    glDisable(GL_BLEND);
+}
+
+/** draw board */
+static void drawBoard(ModeInfo *mi, Chesscreen *cs) 
+{
+  int i, j;
+
+  glBegin(GL_QUADS);
+
+  for(i = 0; i < BOARDSIZE; ++i)
+    for(j = 0; j < BOARDSIZE; ++j) {
+      double ma1 = (i+j)%2 == 0 ? cs->mod*i : 0.0;
+      double mb1 = (i+j)%2 == 0 ? cs->mod*j : 0.0;
+      double ma2 = (i+j)%2 == 0 ? cs->mod*(i+1.0) : 0.01;
+      double mb2 = (i+j)%2 == 0 ? cs->mod*(j+1.0) : 0.01;
+
+      /*glColor3fv(colors[(i+j)%2]);*/
+      glColor4f(cs->colors[(i+j)%2][0], cs->colors[(i+j)%2][1],
+		cs->colors[(i+j)%2][2], 0.65);
+      
+      glNormal3f(0.0, 1.0, 0.0);
+/*       glTexCoord2f(mod*i, mod*(j+1.0)); */
+      glTexCoord2f(ma1, mb2);
+      glVertex3f(i, 0.0, j + 1.0);
+/*       glTexCoord2f(mod*(i+1.0), mod*(j+1.0)); */
+      glTexCoord2f(ma2, mb2);
+      glVertex3f(i + 1.0, 0.0, j + 1.0);
+      glTexCoord2f(ma2, mb1);
+/*       glTexCoord2f(mod*(i+1.0), mod*j); */
+      glVertex3f(i + 1.0, 0.0, j);
+      glTexCoord2f(ma1, mb1);
+/*       glTexCoord2f(mod*i, mod*j); */
+      glVertex3f(i, 0.0, j);
+
+      mi->polygon_count++;
+    }
+  glEnd();
+
+  {
+    GLfloat off = 0.01;
+    GLfloat w = BOARDSIZE;
+    GLfloat h = 0.1;
+
+    /* Give the board a slight lip. */
+    /* #### oops, normals are wrong here, but you can't tell */
+
+    glColor3f(0.3, 0.3, 0.3);
+    glBegin (GL_QUADS);
+    glVertex3f (0,  0, 0);
+    glVertex3f (0, -h, 0);
+    glVertex3f (0, -h, w);
+    glVertex3f (0,  0, w);
+
+    glVertex3f (0,  0, w);
+    glVertex3f (0, -h, w);
+    glVertex3f (w, -h, w);
+    glVertex3f (w,  0, w);
+
+    glVertex3f (w,  0, w);
+    glVertex3f (w, -h, w);
+    glVertex3f (w, -h, 0);
+    glVertex3f (w,  0, 0);
+
+    glVertex3f (w,  0, 0);
+    glVertex3f (w, -h, 0);
+    glVertex3f (0, -h, 0);
+    glVertex3f (0,  0, 0);
+
+    glVertex3f (0, -h, 0);
+    glVertex3f (w, -h, 0);
+    glVertex3f (w, -h, w);
+    glVertex3f (0, -h, w);
+    glEnd();
+    mi->polygon_count += 4;
+
+    /* Fill in the underside of the board with an invisible black box
+       to hide the reflections that are not on tiles.  Probably there's
+       a way to do this with stencils instead.
+     */
+    w -= off*2;
+    h = 5;
+
+    glPushMatrix();
+    glTranslatef (off, 0, off);
+    glDisable(GL_LIGHTING);
+    glColor3f(0,0,0);
+    glBegin (GL_QUADS);
+    glVertex3f (0,  0, 0);
+    glVertex3f (0, -h, 0);
+    glVertex3f (0, -h, w);
+    glVertex3f (0,  0, w);
+
+    glVertex3f (0,  0, w);
+    glVertex3f (0, -h, w);
+    glVertex3f (w, -h, w);
+    glVertex3f (w,  0, w);
+
+    glVertex3f (w,  0, w);
+    glVertex3f (w, -h, w);
+    glVertex3f (w, -h, 0);
+    glVertex3f (w,  0, 0);
+
+    glVertex3f (w,  0, 0);
+    glVertex3f (w, -h, 0);
+    glVertex3f (0, -h, 0);
+    glVertex3f (0,  0, 0);
+
+    glVertex3f (0, -h, 0);
+    glVertex3f (w, -h, 0);
+    glVertex3f (w, -h, w);
+    glVertex3f (0, -h, w);
+    glEnd();
+    mi->polygon_count += 4;
+    glPopMatrix();
+    if (!cs->wire)
+      glEnable(GL_LIGHTING);
+  }
+}
+
+static void draw_pieces(ModeInfo *mi, Chesscreen *cs, int wire) 
+{
+  if (!cs->wire) {
+    glEnable(GL_TEXTURE_2D);
+    glBindTexture(GL_TEXTURE_2D, cs->piecetexture);
+    glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+
+    glColor4f(0.5, 0.5, 0.5, 1.0);
+    glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialShadow);
+  }
+
+  drawPieces(mi, cs);
+  if(cs->moving) drawMovingPiece(mi, cs, 0);
+  if(cs->take) drawTakePiece(mi, cs, 0);
+  glDisable(GL_TEXTURE_2D);
+}
+
+static void draw_shadow_pieces(ModeInfo *mi, Chesscreen *cs, int wire) 
+{
+  if (!cs->wire) {
+    glEnable(GL_TEXTURE_2D);
+    glBindTexture(GL_TEXTURE_2D, cs->piecetexture);
+    glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+  }
+
+  /* use the stencil */
+  glDisable(GL_LIGHTING);
+  glDisable(GL_COLOR_MATERIAL);
+  glDisable(GL_DEPTH_TEST);
+  glDisable(GL_TEXTURE_2D);
+  glDisable(GL_BLEND);
+
+  glClear(GL_STENCIL_BUFFER_BIT);
+  glColorMask(0,0,0,0);
+  glEnable(GL_STENCIL_TEST);
+
+  glStencilFunc(GL_ALWAYS, 1, 0xFFFFFFFFL);
+  glStencilOp(GL_KEEP, GL_KEEP, GL_INCR);
+  
+
+  glPushMatrix();
+  glTranslatef(0.0, 0.001, 0.0);
+
+  /* draw the pieces */
+  drawPiecesShadow(mi, cs);
+  if(cs->moving) drawMovingPiece(mi, cs, shadows);
+  if(cs->take) drawTakePiece(mi, cs, shadows);
+
+  glPopMatrix();
+
+
+  /* turn on drawing into colour buffer */
+  glColorMask(1,1,1,1);
+
+  /* programming with effect */
+  glDisable(GL_LIGHTING);
+  glDisable(GL_COLOR_MATERIAL);
+  glDisable(GL_TEXTURE_2D);
+
+  /* now draw the union of the shadows */
+
+  /* 
+     <todo>
+     want to keep alpha values (alpha is involved in transition
+     effects of the active pieces).
+     </todo>
+  */
+  glStencilFunc(GL_NOTEQUAL, 0, 0xFFFFFFFFL);
+  glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
+
+  glEnable(GL_BLEND);
+
+  glColor4fv(MaterialShadow);
+
+  /* draw the board generously to fill the shadows */
+  glBegin(GL_QUADS);
+
+  glVertex3f(-1.0, 0.0, -1.0);
+  glVertex3f(-1.0, 0.0, BOARDSIZE + 1.0);
+  glVertex3f(1.0 + BOARDSIZE, 0.0, BOARDSIZE + 1.0);
+  glVertex3f(1.0 + BOARDSIZE, 0.0, -1.0);
+
+  glEnd();
+
+  glDisable(GL_STENCIL_TEST);
+
+  /* "pop" attributes */
+  glEnable(GL_TEXTURE_2D);
+  glEnable(GL_COLOR_MATERIAL);
+  glEnable(GL_LIGHTING);
+  glEnable(GL_CULL_FACE);
+
+
+
+}
+
+enum {X, Y, Z, W};
+enum {A, B, C, D};
+
+/* create a matrix that will project the desired shadow */
+static void shadowmatrix(GLfloat shadowMat[4][4],
+		  GLfloat groundplane[4],
+		  GLfloat lightpos[4]) 
+{
+  GLfloat dot;
+
+  /* find dot product between light position vector and ground plane normal */
+  dot = groundplane[X] * lightpos[X] +
+        groundplane[Y] * lightpos[Y] +
+        groundplane[Z] * lightpos[Z] +
+        groundplane[W] * lightpos[W];
+
+  shadowMat[0][0] = dot - lightpos[X] * groundplane[X];
+  shadowMat[1][0] = 0.f - lightpos[X] * groundplane[Y];
+  shadowMat[2][0] = 0.f - lightpos[X] * groundplane[Z];
+  shadowMat[3][0] = 0.f - lightpos[X] * groundplane[W];
+
+  shadowMat[X][1] = 0.f - lightpos[Y] * groundplane[X];
+  shadowMat[1][1] = dot - lightpos[Y] * groundplane[Y];
+  shadowMat[2][1] = 0.f - lightpos[Y] * groundplane[Z];
+  shadowMat[3][1] = 0.f - lightpos[Y] * groundplane[W];
+
+  shadowMat[X][2] = 0.f - lightpos[Z] * groundplane[X];
+  shadowMat[1][2] = 0.f - lightpos[Z] * groundplane[Y];
+  shadowMat[2][2] = dot - lightpos[Z] * groundplane[Z];
+  shadowMat[3][2] = 0.f - lightpos[Z] * groundplane[W];
+
+  shadowMat[X][3] = 0.f - lightpos[W] * groundplane[X];
+  shadowMat[1][3] = 0.f - lightpos[W] * groundplane[Y];
+  shadowMat[2][3] = 0.f - lightpos[W] * groundplane[Z];
+  shadowMat[3][3] = dot - lightpos[W] * groundplane[W];
+}
+
+/** reflectionboard */
+static void draw_reflections(ModeInfo *mi, Chesscreen *cs) 
+{
+  int i, j;
+
+  glEnable(GL_STENCIL_TEST);
+  glStencilFunc(GL_ALWAYS, 1, 1);
+  glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
+  glColorMask(0,0,0,0);
+  glDisable(GL_CULL_FACE);
+
+  glDisable(GL_DEPTH_TEST);
+  glBegin(GL_QUADS);
+
+  /* only draw white squares */
+  for(i = 0; i < BOARDSIZE; ++i) {
+    for(j = (BOARDSIZE+i) % 2; j < BOARDSIZE; j += 2) {
+      glVertex3f(i, 0.0, j + 1.0);
+      glVertex3f(i + 1.0, 0.0, j + 1.0);
+      glVertex3f(i + 1.0, 0.0, j);
+      glVertex3f(i, 0.0, j);
+      mi->polygon_count++;
+    }
+  }
+  glEnd();
+  glEnable(GL_DEPTH_TEST);
+
+  glColorMask(1, 1, 1, 1);
+  glStencilFunc(GL_EQUAL, 1, 1);
+  glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
+  
+  glPushMatrix(); 
+  glScalef(1.0, -1.0, 1.0);
+  glTranslatef(0.5, 0.0, 0.5);
+
+  glLightfv(GL_LIGHT0, GL_POSITION, cs->position);
+  draw_pieces(mi, cs, cs->wire);
+  glPopMatrix();
+  
+  glDisable(GL_STENCIL_TEST);
+  glLightfv(GL_LIGHT0, GL_POSITION, cs->position);
+
+  glEnable(GL_CULL_FACE);
+  glCullFace(GL_BACK);
+  glColorMask(1,1,1,1);
+}
+
+/** draws the scene */
+static void display(ModeInfo *mi, Chesscreen *cs) 
+{
+  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+
+  mi->polygon_count = 0;
+
+  glMatrixMode(GL_MODELVIEW);
+  glLoadIdentity();
+  glRotatef(current_device_rotation(), 0, 0, 1);
+
+  /** setup perspectiv */
+  glTranslatef(0.0, 0.0, -1.5*BOARDSIZE);
+  glRotatef(30.0, 1.0, 0.0, 0.0);
+  gltrackball_rotate (cs->trackball);
+
+  if (rotate)
+    glRotatef(cs->theta*100, 0.0, 1.0, 0.0);
+  glTranslatef(-0.5*BOARDSIZE, 0.0, -0.5*BOARDSIZE);
+
+/*   cs->position[0] = 4.0 + 1.0*-sin(cs->theta*100*M_PI/180.0); */
+/*   cs->position[2] = 4.0 + 1.0* cos(cs->theta*100*M_PI/180.0); */
+/*   cs->position[1] = 5.0; */
+
+  /* this is the lone light that the shadow matrix is generated from */
+  cs->position[0] = 1.0;
+  cs->position[2] = 1.0;
+  cs->position[1] = 16.0;
+
+  cs->position2[0] = 4.0 + 8.0*-sin(cs->theta*100*M_PI/180.0);
+  cs->position2[2] = 4.0 + 8.0* cos(cs->theta*100*M_PI/180.0);
+
+  if (!cs->wire) {
+    glEnable(GL_LIGHTING);
+    glLightfv(GL_LIGHT0, GL_POSITION, cs->position);
+    glLightfv(GL_LIGHT1, GL_POSITION, cs->position2);
+    glEnable(GL_LIGHT0);
+  }
+
+  /** draw board, pieces */
+  if(!cs->wire) {
+    glEnable(GL_LIGHTING);
+    glEnable(GL_COLOR_MATERIAL);
+
+    if(reflections && !cs->wire) {
+      draw_reflections(mi, cs);
+      glEnable(GL_BLEND);
+    }
+
+    glEnable(GL_TEXTURE_2D);
+    glBindTexture(GL_TEXTURE_2D, cs->boardtexture);
+    drawBoard(mi, cs);
+    glDisable(GL_TEXTURE_2D);
+
+    if(shadows) {
+      /* render shadows */
+      GLfloat m[4][4];
+      shadowmatrix(m, cs->ground, cs->position);
+
+      glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialShadow);
+      glEnable(GL_BLEND);
+      glDisable(GL_LIGHTING);
+      glDisable(GL_DEPTH_TEST);
+      
+      /* display ant shadow */
+      glPushMatrix();
+      glTranslatef(0.0, 0.001, 0.0);
+      glMultMatrixf(m[0]);
+      glTranslatef(0.5, 0.01, 0.5);
+      draw_shadow_pieces(mi, cs, cs->wire);
+      glPopMatrix();      
+
+      glEnable(GL_LIGHTING);
+      glDisable(GL_BLEND);
+      glEnable(GL_DEPTH_TEST);
+    }
+
+    if(reflections)
+      glDisable(GL_BLEND);
+  }
+  else
+    drawBoard(mi, cs);
+ 
+  glTranslatef(0.5, 0.0, 0.5);
+  draw_pieces(mi, cs, cs->wire);
+
+  if(!cs->wire) {
+    glDisable(GL_COLOR_MATERIAL);
+    glDisable(GL_LIGHTING);
+  }
+
+  if (!cs->button_down_p)
+    cs->theta += .002;
+}
+
+/** reshape handler */
+ENTRYPOINT void reshape_chess(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 * 9/16;
+    y = -height/2;
+    h = height / (GLfloat) width;
+  }
+
+  glViewport(0,y, width, height);
+  glMatrixMode(GL_PROJECTION);
+  glLoadIdentity();
+  gluPerspective(45, 1/h, 2.0, 30.0);
+  glMatrixMode(GL_MODELVIEW);
+}
+
+/** initialization handler */
+ENTRYPOINT void init_chess(ModeInfo *mi) 
+{
+  Chesscreen *cs;
+  int screen = MI_SCREEN(mi);
+
+  MI_INIT(mi, qs);
+  
+  cs = &qs[screen];
+  cs->window = MI_WINDOW(mi);
+  cs->wire = MI_IS_WIREFRAME(mi);
+  cs->trackball = gltrackball_init (False);
+  
+  cs->oldwhite = -1;
+
+  cs->colors[0][0] = 1.0;
+  cs->colors[0][1] = 0.5;
+  cs->colors[0][2] = 0.0;
+
+  cs->colors[1][0] = 0.6;
+  cs->colors[1][1] = 0.6;
+  cs->colors[1][2] = 0.6;
+
+  cs->done = 1;
+  cs->count = 99;
+  cs->mod = 1.4;
+
+/*   cs->position[0] = 0.0; */
+/*   cs->position[1] = 5.0; */
+/*   cs->position[2] = 5.0; */
+/*   cs->position[3] = 1.0; */
+
+  cs->position[0] = 0.0;
+  cs->position[1] = 24.0;
+  cs->position[2] = 2.0;
+  cs->position[3] = 1.0;
+
+
+  cs->position2[0] = 5.0;
+  cs->position2[1] = 5.0;
+  cs->position2[2] = 5.0;
+  cs->position2[3] = 1.0;
+
+  cs->ground[0] = 0.0;
+  cs->ground[1] = 1.0;
+  cs->ground[2] = 0.0;
+  cs->ground[3] = -0.00001;
+
+  cs->oldgame = -1;
+
+
+  if((cs->glx_context = init_GL(mi)))
+    reshape_chess(mi, MI_WIDTH(mi), MI_HEIGHT(mi));
+  else
+    MI_CLEARWINDOW(mi);
+
+  if (!cs->wire) {
+    glDepthFunc(GL_LEQUAL);
+    glClearStencil(0);
+    glEnable(GL_CULL_FACE);
+    glCullFace(GL_BACK);
+
+    make_piece_texture(cs);
+    make_board_texture(cs);
+  }
+  chessmodels_gen_lists( classic, cs->poly_counts);
+
+# ifdef HAVE_JWZGLES /* #### glPolygonMode other than GL_FILL unimplemented */
+    cs->wire = 0;
+# endif
+
+  if(!cs->wire) {
+    setup_lights(cs);
+    glColorMaterial(GL_FRONT, GL_DIFFUSE);
+    glShadeModel(smooth ? GL_SMOOTH : GL_FLAT);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    glEnable(GL_DEPTH_TEST);
+  }
+  else
+    glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+}
+
+/** does dirty work drawing scene, moving pieces */
+ENTRYPOINT void draw_chess(ModeInfo *mi) 
+{
+  Chesscreen *cs = &qs[MI_SCREEN(mi)];
+  Window w = MI_WINDOW(mi);
+  Display *disp = MI_DISPLAY(mi);
+
+  if(!cs->glx_context)
+    return;
+
+  glXMakeCurrent(disp, w, *(cs->glx_context));
+
+  /** code for moving a piece */
+  if(cs->moving && ++cs->steps == 100) {
+    cs->moving = cs->count = cs->steps = cs->take = 0;
+    cs->game.board[cs->game.moves[cs->mc][2]][cs->game.moves[cs->mc][3]] = cs->mpiece;
+    ++cs->mc;
+    
+    if(cs->mc == cs->game.movecount) {
+      cs->done = 1;
+      cs->mc = 0;
+    }
+  }
+
+  if(++cs->count == 100) {
+    if(!cs->done) {
+      cs->mpiece = cs->game.board[cs->game.moves[cs->mc][0]][cs->game.moves[cs->mc][1]];
+      cs->game.board[cs->game.moves[cs->mc][0]][cs->game.moves[cs->mc][1]] = NONE;
+      
+      if((cs->tpiece = cs->game.board[cs->game.moves[cs->mc][2]][cs->game.moves[cs->mc][3]])) {
+	cs->game.board[cs->game.moves[cs->mc][2]][cs->game.moves[cs->mc][3]] = NONE;
+	cs->take = 1;
+      }
+      
+      cs->from[0] = cs->game.moves[cs->mc][0];
+      cs->from[1] = cs->game.moves[cs->mc][1];
+      cs->to[0] = cs->game.moves[cs->mc][2];
+      cs->to[1] = cs->game.moves[cs->mc][3];
+      
+      cs->dz = (cs->to[0] - cs->from[0]) / 100;
+      cs->dx = (cs->to[1] - cs->from[1]) / 100;
+      cs->steps = 0;
+      cs->moving = 1;
+    }
+    else if(cs->done == 1) {
+      int newgame = cs->oldgame;
+      while(newgame == cs->oldgame)
+	newgame = random()%GAMES;
+
+      /* mod the mod */
+      cs->mod = 0.6 + (random()%20)/10.0;
+
+      /* same old game */
+      cs->oldgame = newgame;
+      cs->game = games[cs->oldgame];
+      build_colors(cs);
+      cs->done = 2;
+      cs->count = 0;
+    }
+    else {
+      cs->done = 0;
+      cs->count = 0;
+    }
+  }
+
+  /* set lighting */
+  if(cs->done) {
+    glLightf(GL_LIGHT0, GL_CONSTANT_ATTENUATION, 
+	     cs->done == 1 ? 1.0+0.1*cs->count : 100.0/cs->count);
+    glLightf(GL_LIGHT1, GL_CONSTANT_ATTENUATION, 
+	     cs->done == 1 ? 1.0+0.1*cs->count : 100.0/cs->count);
+    glLightf(GL_LIGHT1, GL_LINEAR_ATTENUATION, 0.14);
+    glLightf(GL_LIGHT0, GL_LINEAR_ATTENUATION, 0.14);
+  }
+
+  display(mi, cs);
+
+  if(mi->fps_p) do_fps(mi);
+  glFinish(); 
+  glXSwapBuffers(disp, w);
+}
+
+XSCREENSAVER_MODULE_2 ("Endgame", endgame, chess)
+
+#endif