/* -*- Mode: C; tab-width: 4 -*- */
/* moebius --- Moebius Strip II, an Escher-like GL scene with ants. */
-#if !defined( lint ) && !defined( SABER )
-static const char sccsid[] = "@(#)moebius.c 4.08 97/01/04 xlockmore";
-
+#if 0
+static const char sccsid[] = "@(#)moebius.c 5.01 2001/03/01 xlockmore";
#endif
-#undef DEBUG_LISTS
-
/*-
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted,
* other special, indirect and consequential damages.
*
* The RotateAroundU() routine was adapted from the book
- * "Computer Graphics Principles and Practice
+ * "Computer Graphics Principles and Practice
* Foley - vanDam - Feiner - Hughes
* Second Edition" Pag. 227, exercise 5.15.
- *
+ *
* This mode shows some interesting scenes that are impossible OR very
* wierd to build in the real universe. Much of the scenes are inspirated
* on Mauritz Cornelis Escher's works which derivated the mode's name.
* M.C. Escher (1898-1972) was a dutch artist and many people prefer to
* say he was a mathematician.
*
- * Thanks goes to Brian Paul for making it possible and inexpensive to use
+ * Thanks goes to Brian Paul for making it possible and inexpensive to use
* OpenGL at home.
*
* Since I'm not a native English speaker, my apologies for any grammatical
- * mistake.
+ * mistakes.
*
* My e-mail address is
- * m-vianna@usa.net
+ * mfvianna@centroin.com.br
*
* Marcelo F. Vianna (Jun-01-1997)
*
* Revision History:
- * 01-Jan-98: Mode separated from escher and renamed
- * 08-Jun-97: New scene implemented: "Impossible Cage" based in a M.C. Escher's
- * painting with the same name (quite similar). The first GL mode
- * to use texture mapping.
- * The "Impossible Cage" scene doesn't use DEPTH BUFFER, the
- * wood planks are drawn consistently using GL_CULL_FACE, and
- * the painter's algorithm is used to sort the planks.
- * Marcelo F. Vianna.
- * 07-Jun-97: Speed ups in Moebius Strip using GL_CULL_FACE.
- * Marcelo F. Vianna.
- * 03-Jun-97: Initial Release (Only one scene: "Moebius Strip")
- * The Moebius Strip scene was inspirated in a M.C. Escher's
- * painting named Moebius Strip II in wich ants walk across a
- * Moebius Strip path, sometimes meeting each other and sometimes
- * being in "opposite faces" (note that the moebius strip has
- * only one face and one edge).
- * Marcelo F. Vianna.
- *
+ * 05-Apr-2002: Removed all gllist uses (fix some bug with nvidia driver)
+ * 01-Mar-2001: backported from xscreensaver by lassauge@mail.dotcom.fr
+ * Feb-2001: Made motion and rotation be smoother Jamie Zawinski
+ * <jwz@jwz.org>
+ * 01-Nov-2000: Allocation checks
+ * 01-Jan-1998: Mode separated from escher and renamed
+ * 08-Jun-1997: New scene implemented: "Impossible Cage" based in a M.C.
+ * Escher's painting with the same name (quite similar). The
+ * first GL mode to use texture mapping.
+ * The "Impossible Cage" scene doesn't use DEPTH BUFFER, the
+ * wood planks are drawn consistently using GL_CULL_FACE, and
+ * the painter's algorithm is used to sort the planks.
+ * Marcelo F. Vianna.
+ * 07-Jun-1997: Speed ups in Moebius Strip using GL_CULL_FACE.
+ * Marcelo F. Vianna.
+ * 03-Jun-1997: Initial Release (Only one scene: "Moebius Strip")
+ * The Moebius Strip scene was inspirated in a M.C. Escher's
+ * painting named Moebius Strip II in wich ants walk across a
+ * Moebius Strip path, sometimes meeting each other and sometimes
+ * being in "opposite faces" (note that the moebius strip has
+ * only one face and one edge).
+ * Marcelo F. Vianna.
*/
/*-
* In real OpenGL, PseudoColor DO NOT support texture map (as far as I know).
*/
-#include <X11/Intrinsic.h>
-
#ifdef STANDALONE
-# define PROGCLASS "Moebius"
-# define HACK_INIT init_moebius
-# define HACK_DRAW draw_moebius
-# define HACK_RESHAPE reshape_moebius
-# define moebius_opts xlockmore_opts
-# define DEFAULTS "*cycles: 1 \n" \
- "*delay: 20000 \n" \
+# define MODE_moebius
+# define free_moebius 0
+# define release_moebius 0
+# define DEFAULTS "*delay: 20000 \n" \
"*showFPS: False \n" \
- "*wireframe: False \n"
+ "*suppressRotationAnimation: True\n" \
+
# include "xlockmore.h" /* from the xscreensaver distribution */
#else /* !STANDALONE */
# include "xlock.h" /* from the xlockmore distribution */
-
#endif /* !STANDALONE */
-#ifdef USE_GL
+#ifdef HAVE_JWXYZ
+# include "jwxyz.h"
+#else
+# include <X11/Xlib.h>
+# include <GL/gl.h>
+# include <GL/glu.h>
+#endif
+
+#ifdef HAVE_JWZGLES
+# include "jwzgles.h"
+#endif /* HAVE_JWZGLES */
+#ifdef MODE_moebius
-#include <GL/glu.h>
+#if 0 /* Hey, this never actually used the texture at all! */
+#if 0
#include "e_textures.h"
+#else
+#include "ximage-loader.h"
+#include "images/gen/wood_png.h"
+#endif
+#endif /* 0 */
+
+#include "sphere.h"
+#include "tube.h"
+
+#include "rotator.h"
+#include "gltrackball.h"
#define DEF_SOLIDMOEBIUS "False"
-#define DEF_NOANTS "False"
+#define DEF_DRAWANTS "True"
static int solidmoebius;
-static int noants;
+static int drawants;
static XrmOptionDescRec opts[] =
{
- {"-solidmoebius", ".moebius.solidmoebius", XrmoptionNoArg, (caddr_t) "on"},
- {"+solidmoebius", ".moebius.solidmoebius", XrmoptionNoArg, (caddr_t) "off"},
- {"-noants", ".moebius.noants", XrmoptionNoArg, (caddr_t) "on"},
- {"+noants", ".moebius.noants", XrmoptionNoArg, (caddr_t) "off"}
+ {"-solidmoebius", ".moebius.solidmoebius", XrmoptionNoArg, "on"},
+ {"+solidmoebius", ".moebius.solidmoebius", XrmoptionNoArg, "off"},
+ {"-ants", ".moebius.drawants", XrmoptionNoArg, "on"},
+ {"+ants", ".moebius.drawants", XrmoptionNoArg, "off"}
};
static argtype vars[] =
{
- {(caddr_t *) & solidmoebius, "solidmoebius", "Solidmoebius", DEF_SOLIDMOEBIUS, t_Bool},
- {(caddr_t *) & noants, "noants", "Noants", DEF_NOANTS, t_Bool}
+ {&solidmoebius, "solidmoebius", "Solidmoebius", DEF_SOLIDMOEBIUS, t_Bool},
+ {&drawants, "drawants", "Drawants", DEF_DRAWANTS, t_Bool}
+
};
static OptionStruct desc[] =
{
{"-/+solidmoebius", "select between a SOLID or a NET Moebius Strip"},
- {"-/+noants", "turn on/off walking ants"}
+ {"-/+drawants", "turn on/off walking ants"}
};
-ModeSpecOpt moebius_opts =
+ENTRYPOINT ModeSpecOpt moebius_opts =
{sizeof opts / sizeof opts[0], opts, sizeof vars / sizeof vars[0], vars, desc};
#ifdef USE_MODULES
ModStruct moebius_description =
-{"moebius", "init_moebius", "draw_moebius", "release_moebius",
- "draw_moebius", "change_moebius", NULL, &moebius_opts,
+{"moebius", "init_moebius", "draw_moebius", (char *) NULL,
+ "draw_moebius", "change_moebius", (char *) NULL, &moebius_opts,
1000, 1, 1, 1, 4, 1.0, "",
"Shows Moebius Strip II, an Escher-like GL scene with ants", 0, NULL};
#define Pi M_PI
#endif
+#define ObjMoebiusStrip 0
+#define ObjAntBody 1
+#define MaxObj 2
+
/*************************************************************************/
typedef struct {
GLint WindH, WindW;
GLfloat step;
GLfloat ant_position;
- int AreObjectsDefined[2];
+ float ant_step;
GLXContext *glx_context;
-
- GLfloat rotx, roty, rotz; /* current object rotation */
- GLfloat dx, dy, dz; /* current rotational velocity */
- GLfloat ddx, ddy, ddz; /* current rotational acceleration */
- GLfloat d_max; /* max velocity */
-
+ rotator *rot;
+ trackball_state *trackball;
+ Bool button_down_p;
} moebiusstruct;
-static float front_shininess[] =
-{60.0};
-static float front_specular[] =
-{0.7, 0.7, 0.7, 1.0};
-static float ambient[] =
-{0.0, 0.0, 0.0, 1.0};
-static float diffuse[] =
-{1.0, 1.0, 1.0, 1.0};
-static float position0[] =
-{1.0, 1.0, 1.0, 0.0};
-static float position1[] =
-{-1.0, -1.0, 1.0, 0.0};
-static float lmodel_ambient[] =
-{0.5, 0.5, 0.5, 1.0};
-static float lmodel_twoside[] =
-{GL_TRUE};
-
-static float MaterialRed[] =
-{0.7, 0.0, 0.0, 1.0};
-static float MaterialGreen[] =
-{0.1, 0.5, 0.2, 1.0};
-static float MaterialBlue[] =
-{0.0, 0.0, 0.7, 1.0};
-static float MaterialCyan[] =
-{0.2, 0.5, 0.7, 1.0};
-static float MaterialYellow[] =
-{0.7, 0.7, 0.0, 1.0};
-static float MaterialMagenta[] =
-{0.6, 0.2, 0.5, 1.0};
-static float MaterialWhite[] =
-{0.7, 0.7, 0.7, 1.0};
-static float MaterialGray[] =
-{0.2, 0.2, 0.2, 1.0};
-static float MaterialGray5[] =
-{0.5, 0.5, 0.5, 1.0};
-static float MaterialGray6[] =
-{0.6, 0.6, 0.6, 1.0};
-static float MaterialGray8[] =
-{0.8, 0.8, 0.8, 1.0};
-
-static moebiusstruct *moebius = NULL;
-static GLuint objects;
+static const float front_shininess[] = {60.0};
+static const float front_specular[] = {0.7, 0.7, 0.7, 1.0};
+static const float ambient[] = {0.0, 0.0, 0.0, 1.0};
+static const float diffuse[] = {1.0, 1.0, 1.0, 1.0};
+static const float position0[] = {1.0, 1.0, 1.0, 0.0};
+static const float position1[] = {-1.0, -1.0, 1.0, 0.0};
+static const float lmodel_ambient[] = {0.5, 0.5, 0.5, 1.0};
+static const float lmodel_twoside[] = {GL_TRUE};
+
+static const float MaterialRed[] = {0.7, 0.0, 0.0, 1.0};
+static const float MaterialGreen[] = {0.1, 0.5, 0.2, 1.0};
+static const float MaterialBlue[] = {0.0, 0.0, 0.7, 1.0};
+static const float MaterialCyan[] = {0.2, 0.5, 0.7, 1.0};
+static const float MaterialYellow[] = {0.7, 0.7, 0.0, 1.0};
+static const float MaterialMagenta[] = {0.6, 0.2, 0.5, 1.0};
+static const float MaterialWhite[] = {0.7, 0.7, 0.7, 1.0};
+static const float MaterialGray[] = {0.2, 0.2, 0.2, 1.0};
+static const float MaterialGray5[] = {0.5, 0.5, 0.5, 1.0};
+static const float MaterialGray6[] = {0.6, 0.6, 0.6, 1.0};
+static const float MaterialGray8[] = {0.8, 0.8, 0.8, 1.0};
+
+static moebiusstruct *moebius = (moebiusstruct *) NULL;
#define NUM_SCENES 2
-#define ObjMoebiusStrip 0
-#define ObjAntBody 1
-
-static void
+static Bool
mySphere(float radius)
{
+#if 0
GLUquadricObj *quadObj;
- quadObj = gluNewQuadric();
+ if ((quadObj = gluNewQuadric()) == 0)
+ return False;
gluQuadricDrawStyle(quadObj, (GLenum) GLU_FILL);
gluSphere(quadObj, radius, 16, 16);
gluDeleteQuadric(quadObj);
+#else
+ glPushMatrix();
+ glScalef (radius, radius, radius);
+ unit_sphere (16, 16, False);
+ glPopMatrix();
+#endif
+ return True;
}
-static void
+static Bool
myCone(float radius)
{
+#if 0
GLUquadricObj *quadObj;
- quadObj = gluNewQuadric();
+ if ((quadObj = gluNewQuadric()) == 0)
+ return False;
gluQuadricDrawStyle(quadObj, (GLenum) GLU_FILL);
gluCylinder(quadObj, radius, 0, radius * 3, 8, 1);
gluDeleteQuadric(quadObj);
+#else
+ cone (0, 0, 0,
+ 0, 0, radius * 3,
+ radius, 0,
+ 8, True, True, False);
+#endif
+ return True;
}
-static void
-draw_moebius_ant(moebiusstruct * mp, float *Material, int mono)
+static Bool
+draw_moebius_ant(moebiusstruct * mp, const float *Material, int mono)
{
- static float ant_step = 0;
- float cos1 = cos(ant_step);
- float cos2 = cos(ant_step + 2 * Pi / 3);
- float cos3 = cos(ant_step + 4 * Pi / 3);
- float sin1 = sin(ant_step);
- float sin2 = sin(ant_step + 2 * Pi / 3);
- float sin3 = sin(ant_step + 4 * Pi / 3);
+ float cos1 = cos(mp->ant_step);
+ float cos2 = cos(mp->ant_step + 2 * Pi / 3);
+ float cos3 = cos(mp->ant_step + 4 * Pi / 3);
+ float sin1 = sin(mp->ant_step);
+ float sin2 = sin(mp->ant_step + 2 * Pi / 3);
+ float sin3 = sin(mp->ant_step + 4 * Pi / 3);
if (mono)
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialGray5);
else
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, Material);
- if (!mp->AreObjectsDefined[ObjAntBody]) {
- glNewList(objects + ObjAntBody, GL_COMPILE_AND_EXECUTE);
- glEnable(GL_CULL_FACE);
- glPushMatrix();
- glScalef(1, 1.3, 1);
- mySphere(0.18);
- glScalef(1, 1 / 1.3, 1);
- glTranslatef(0.00, 0.30, 0.00);
- mySphere(0.2);
-
- glTranslatef(-0.05, 0.17, 0.05);
- glRotatef(-90, 1, 0, 0);
- glRotatef(-25, 0, 1, 0);
- myCone(0.05);
- glTranslatef(0.00, 0.10, 0.00);
- myCone(0.05);
- glRotatef(25, 0, 1, 0);
- glRotatef(90, 1, 0, 0);
-
- glScalef(1, 1.3, 1);
- glTranslatef(0.15, -0.65, 0.05);
- mySphere(0.25);
- glScalef(1, 1 / 1.3, 1);
- glPopMatrix();
- glDisable(GL_CULL_FACE);
- glEndList();
- mp->AreObjectsDefined[ObjAntBody] = 1;
-#ifdef DEBUG_LISTS
- (void) printf("Ant drawn SLOWLY\n");
-#endif
- } else {
- glCallList(objects + ObjAntBody);
-#ifdef DEBUG_LISTS
- (void) printf("Ant drawn quickly\n");
-#endif
- }
+ glEnable(GL_CULL_FACE);
+ glPushMatrix();
+ glScalef(1, 1.3, 1);
+ if (!mySphere(0.18))
+ return False;
+ glScalef(1, 1 / 1.3, 1);
+ glTranslatef(0.00, 0.30, 0.00);
+ if (!mySphere(0.2))
+ return False;
+
+ glTranslatef(-0.05, 0.17, 0.05);
+ glRotatef(-90, 1, 0, 0);
+ glRotatef(-25, 0, 1, 0);
+ if (!myCone(0.05))
+ return False;
+ glTranslatef(0.00, 0.10, 0.00);
+ if (!myCone(0.05))
+ return False;
+ glRotatef(25, 0, 1, 0);
+ glRotatef(90, 1, 0, 0);
+
+ glScalef(1, 1.3, 1);
+ glTranslatef(0.15, -0.65, 0.05);
+ if (!mySphere(0.25))
+ return False;
+ glScalef(1, 1 / 1.3, 1);
+ glPopMatrix();
+ glDisable(GL_CULL_FACE);
glDisable(GL_LIGHTING);
/* ANTENNAS */
glEnable(GL_LIGHTING);
- ant_step += 0.3;
+ mp->ant_step += 0.3;
+ return True;
}
static void
#define MoebiusDivisions 40
#define MoebiusTransversals 4
-static void
+static Bool
draw_moebius_strip(ModeInfo * mi)
{
GLfloat Phi, Theta;
float Cx, Cy, Cz;
- if (!mp->AreObjectsDefined[ObjMoebiusStrip]) {
- glNewList(objects + ObjMoebiusStrip, GL_COMPILE_AND_EXECUTE);
+#ifdef HAVE_JWZGLES /* #### glPolygonMode other than GL_FILL unimplemented */
+ solidmoebius = True;
+#endif
- if (solidmoebius) {
+ if (solidmoebius) {
+ glBegin(GL_QUAD_STRIP);
+ Phi = 0;
+ i = 0;
+ while (i < (MoebiusDivisions * 2 + 1)) {
+ Theta = Phi / 2;
+ cPhi = cos(Phi);
+ sPhi = sin(Phi);
+
+ i++;
+ if (mono)
+ glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialWhite);
+ else if (i % 2)
+ glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialRed);
+ else
+ glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialGray);
+
+ RotateAaroundU(cPhi, sPhi, 0, -sPhi, cPhi, 0, &Cx, &Cy, &Cz, Theta);
+ glNormal3f(Cx, Cy, Cz);
+ RotateAaroundU(0, 0, 1, -sPhi, cPhi, 0, &Cx, &Cy, &Cz, Theta);
+ glVertex3f(cPhi * 3 + Cx, sPhi * 3 + Cy, +Cz);
+ glVertex3f(cPhi * 3 - Cx, sPhi * 3 - Cy, -Cz);
+
+ Phi += Pi / MoebiusDivisions;
+ }
+ glEnd();
+ } else {
+ for (j = -MoebiusTransversals; j < MoebiusTransversals; j++) {
+ glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
glBegin(GL_QUAD_STRIP);
Phi = 0;
i = 0;
cPhi = cos(Phi);
sPhi = sin(Phi);
- i++;
- if (mono)
+ RotateAaroundU(cPhi, sPhi, 0, -sPhi, cPhi, 0, &Cx, &Cy, &Cz, Theta);
+ glNormal3f(Cx, Cy, Cz);
+ RotateAaroundU(0, 0, 1, -sPhi, cPhi, 0, &Cx, &Cy, &Cz, Theta);
+ j++;
+ if (j == MoebiusTransversals || mono)
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialWhite);
else if (i % 2)
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialRed);
else
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialGray);
-
- RotateAaroundU(cPhi, sPhi, 0, -sPhi, cPhi, 0, &Cx, &Cy, &Cz, Theta);
- glNormal3f(Cx, Cy, Cz);
- RotateAaroundU(0, 0, 1, -sPhi, cPhi, 0, &Cx, &Cy, &Cz, Theta);
- glVertex3f(cPhi * 3 + Cx, sPhi * 3 + Cy, +Cz);
- glVertex3f(cPhi * 3 - Cx, sPhi * 3 - Cy, -Cz);
+ glVertex3f(cPhi * 3 + Cx / MoebiusTransversals * j, sPhi * 3 + Cy / MoebiusTransversals * j, +Cz / MoebiusTransversals * j);
+ j--;
+ if (j == -MoebiusTransversals || mono)
+ glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialWhite);
+ else if (i % 2)
+ glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialRed);
+ else
+ glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialGray);
+ glVertex3f(cPhi * 3 + Cx / MoebiusTransversals * j, sPhi * 3 + Cy / MoebiusTransversals * j, +Cz / MoebiusTransversals * j);
Phi += Pi / MoebiusDivisions;
+ i++;
}
glEnd();
- } else {
- for (j = -MoebiusTransversals; j < MoebiusTransversals; j++) {
- glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
- glBegin(GL_QUAD_STRIP);
- Phi = 0;
- i = 0;
- while (i < (MoebiusDivisions * 2 + 1)) {
- Theta = Phi / 2;
- cPhi = cos(Phi);
- sPhi = sin(Phi);
-
- RotateAaroundU(cPhi, sPhi, 0, -sPhi, cPhi, 0, &Cx, &Cy, &Cz, Theta);
- glNormal3f(Cx, Cy, Cz);
- RotateAaroundU(0, 0, 1, -sPhi, cPhi, 0, &Cx, &Cy, &Cz, Theta);
- j++;
- if (j == MoebiusTransversals || mono)
- glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialWhite);
- else if (i % 2)
- glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialRed);
- else
- glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialGray);
- glVertex3f(cPhi * 3 + Cx / MoebiusTransversals * j, sPhi * 3 + Cy / MoebiusTransversals * j, +Cz / MoebiusTransversals * j);
- j--;
- if (j == -MoebiusTransversals || mono)
- glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialWhite);
- else if (i % 2)
- glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialRed);
- else
- glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialGray);
- glVertex3f(cPhi * 3 + Cx / MoebiusTransversals * j, sPhi * 3 + Cy / MoebiusTransversals * j, +Cz / MoebiusTransversals * j);
-
- Phi += Pi / MoebiusDivisions;
- i++;
- }
- glEnd();
- }
- glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
}
-
- glEndList();
- mp->AreObjectsDefined[ObjMoebiusStrip] = 1;
-#ifdef DEBUG_LISTS
- (void) printf("Strip drawn SLOWLY\n");
-#endif
- } else {
- glCallList(objects + ObjMoebiusStrip);
-#ifdef DEBUG_LISTS
- (void) printf("Strip drawn quickly\n");
-#endif
+ glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
}
- if (!noants) {
+ if (drawants) {
/* DRAW BLUE ANT */
glPushMatrix();
glRotatef(mp->ant_position + 180, 0, 0, 1);
glTranslatef(3, 0, 0);
glRotatef(mp->ant_position / 2 + 90, 0, 1, 0);
glTranslatef(0.28, 0, -0.45);
- draw_moebius_ant(mp, MaterialYellow, mono);
+ if (!draw_moebius_ant(mp, MaterialYellow, mono))
+ return False;
glPopMatrix();
/* DRAW YELLOW ANT */
glTranslatef(3, 0, 0);
glRotatef(mp->ant_position / 2, 0, 1, 0);
glTranslatef(0.28, 0, -0.45);
- draw_moebius_ant(mp, MaterialBlue, mono);
+ if (!draw_moebius_ant(mp, MaterialBlue, mono))
+ return False;
glPopMatrix();
/* DRAW GREEN ANT */
glRotatef(-mp->ant_position / 2, 0, 1, 0);
glTranslatef(0.28, 0, 0.45);
glRotatef(180, 1, 0, 0);
- draw_moebius_ant(mp, MaterialGreen, mono);
+ if (!draw_moebius_ant(mp, MaterialGreen, mono))
+ return False;
glPopMatrix();
/* DRAW CYAN ANT */
glRotatef(-mp->ant_position / 2 + 90, 0, 1, 0);
glTranslatef(0.28, 0, 0.45);
glRotatef(180, 1, 0, 0);
- draw_moebius_ant(mp, MaterialCyan, mono);
+ if (!draw_moebius_ant(mp, MaterialCyan, mono))
+ return False;
glPopMatrix();
}
mp->ant_position += 1;
+ return True;
}
#undef MoebiusDivisions
#undef MoebiusTransversals
-void
-reshape_moebius(ModeInfo * mi, int width, int height)
+ENTRYPOINT void
+reshape_moebius (ModeInfo * mi, int width, int height)
{
moebiusstruct *mp = &moebius[MI_SCREEN(mi)];
+ int y = 0;
- glViewport(0, 0, mp->WindW = (GLint) width, mp->WindH = (GLint) height);
+ if (width > height * 5) { /* tiny window: show middle */
+ height = width;
+ y = -height/2;
+ }
+
+ glViewport(0, y, mp->WindW = (GLint) width, mp->WindH = (GLint) height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 15.0);
glLineWidth(1);
glPointSize(1);
}
- mp->AreObjectsDefined[ObjMoebiusStrip] = 0;
- mp->AreObjectsDefined[ObjAntBody] = 0;
}
static void
-pinit(void)
+pinit(ModeInfo *mi)
{
+ /* int status; */
glClearDepth(1.0);
- glClearColor(0.0, 0.0, 0.0, 1.0);
-
glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
glLightfv(GL_LIGHT0, GL_POSITION, position0);
/* moebius */
glShadeModel(GL_SMOOTH);
glEnable(GL_DEPTH_TEST);
- glDisable(GL_TEXTURE_2D);
glDisable(GL_CULL_FACE);
+#if 0
+ glEnable(GL_TEXTURE_2D);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
- gluBuild2DMipmaps(GL_TEXTURE_2D, 3, WoodTextureWidth, WoodTextureHeight,
- GL_RGB, GL_UNSIGNED_BYTE, WoodTextureData);
+
+#if 0
+ clear_gl_error();
+ status = gluBuild2DMipmaps(GL_TEXTURE_2D, 3,
+ WoodTextureWidth, WoodTextureHeight,
+ GL_RGB, GL_UNSIGNED_BYTE, WoodTextureData);
+ if (status)
+ {
+ const char *s = (char *) gluErrorString (status);
+ fprintf (stderr, "%s: error mipmapping %dx%d texture: %s\n",
+ progname, WoodTextureWidth, WoodTextureHeight,
+ (s ? s : "(unknown)"));
+ exit (1);
+ }
+ check_gl_error("mipmapping");
+#else
+ {
+ XImage *img = image_data_to_ximage (mi->dpy, mi->xgwa.visual,
+ wood_png, sizeof(wood_png));
+ glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA,
+ img->width, img->height, 0,
+ GL_RGBA,
+ /* GL_UNSIGNED_BYTE, */
+ GL_UNSIGNED_INT_8_8_8_8_REV,
+ img->data);
+ check_gl_error("texture");
+ XDestroyImage (img);
+ }
+#endif
+
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+#endif
glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, front_shininess);
glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, front_specular);
}
-
-/* lifted from lament.c */
-#define RAND(n) ((long) ((random() & 0x7fffffff) % ((long) (n))))
-#define RANDSIGN() ((random() & 1) ? 1 : -1)
-
-static void
-rotate(GLfloat *pos, GLfloat *v, GLfloat *dv, GLfloat max_v)
+ENTRYPOINT Bool
+moebius_handle_event (ModeInfo *mi, XEvent *event)
{
- double ppos = *pos;
-
- /* tick position */
- if (ppos < 0)
- ppos = -(ppos + *v);
- else
- ppos += *v;
-
- if (ppos > 1.0)
- ppos -= 1.0;
- else if (ppos < 0)
- ppos += 1.0;
-
- if (ppos < 0) abort();
- if (ppos > 1.0) abort();
- *pos = (*pos > 0 ? ppos : -ppos);
-
- /* accelerate */
- *v += *dv;
-
- /* clamp velocity */
- if (*v > max_v || *v < -max_v)
- {
- *dv = -*dv;
- }
- /* If it stops, start it going in the other direction. */
- else if (*v < 0)
- {
- if (random() % 4)
- {
- *v = 0;
-
- /* keep going in the same direction */
- if (random() % 2)
- *dv = 0;
- else if (*dv < 0)
- *dv = -*dv;
- }
- else
- {
- /* reverse gears */
- *v = -*v;
- *dv = -*dv;
- *pos = -*pos;
- }
- }
+ moebiusstruct *mp = &moebius[MI_SCREEN(mi)];
- /* Alter direction of rotational acceleration randomly. */
- if (! (random() % 120))
- *dv = -*dv;
+ if (gltrackball_event_handler (event, mp->trackball,
+ MI_WIDTH (mi), MI_HEIGHT (mi),
+ &mp->button_down_p))
+ return True;
- /* Change acceleration very occasionally. */
- if (! (random() % 200))
- {
- if (*dv == 0)
- *dv = 0.00001;
- else if (random() & 1)
- *dv *= 1.2;
- else
- *dv *= 0.8;
- }
+ return False;
}
-void
-init_moebius(ModeInfo * mi)
+ENTRYPOINT void
+init_moebius (ModeInfo * mi)
{
- int screen = MI_SCREEN(mi);
moebiusstruct *mp;
- if (moebius == NULL) {
- if ((moebius = (moebiusstruct *) calloc(MI_NUM_SCREENS(mi),
- sizeof (moebiusstruct))) == NULL)
- return;
- }
- mp = &moebius[screen];
+ MI_INIT (mi, moebius);
+ mp = &moebius[MI_SCREEN(mi)];
mp->step = NRAND(90);
mp->ant_position = NRAND(90);
- mp->rotx = frand(1.0) * RANDSIGN();
- mp->roty = frand(1.0) * RANDSIGN();
- mp->rotz = frand(1.0) * RANDSIGN();
-
- /* bell curve from 0-1.5 degrees, avg 0.75 */
- mp->dx = (frand(1) + frand(1) + frand(1)) / (360*2);
- mp->dy = (frand(1) + frand(1) + frand(1)) / (360*2);
- mp->dz = (frand(1) + frand(1) + frand(1)) / (360*2);
-
- mp->d_max = mp->dx * 2;
-
- mp->ddx = 0.00006 + frand(0.00003);
- mp->ddy = 0.00006 + frand(0.00003);
- mp->ddz = 0.00006 + frand(0.00003);
+ {
+ double rot_speed = 0.3;
+ mp->rot = make_rotator (rot_speed, rot_speed, rot_speed, 1, 0, True);
+ mp->trackball = gltrackball_init (True);
+ }
if ((mp->glx_context = init_GL(mi)) != NULL) {
reshape_moebius(mi, MI_WIDTH(mi), MI_HEIGHT(mi));
glDrawBuffer(GL_BACK);
- if (!glIsList(objects))
- objects = glGenLists(3);
- pinit();
+ pinit(mi);
} else {
MI_CLEARWINDOW(mi);
}
}
-void
-draw_moebius(ModeInfo * mi)
+ENTRYPOINT void
+draw_moebius (ModeInfo * mi)
{
- moebiusstruct *mp = &moebius[MI_SCREEN(mi)];
+ moebiusstruct *mp;
Display *display = MI_DISPLAY(mi);
Window window = MI_WINDOW(mi);
+ if (moebius == NULL)
+ return;
+ mp = &moebius[MI_SCREEN(mi)];
+
+ MI_IS_DRAWN(mi) = True;
+
if (!mp->glx_context)
return;
glPushMatrix();
+
glTranslatef(0.0, 0.0, -10.0);
+ gltrackball_rotate (mp->trackball);
+
if (!MI_IS_ICONIC(mi)) {
glScalef(Scale4Window * mp->WindH / mp->WindW, Scale4Window, Scale4Window);
} else {
glScalef(Scale4Iconic * mp->WindH / mp->WindW, Scale4Iconic, Scale4Iconic);
}
+# ifdef HAVE_MOBILE /* Keep it the same relative size when rotated. */
+ {
+ GLfloat h = MI_HEIGHT(mi) / (GLfloat) MI_WIDTH(mi);
+ int o = (int) current_device_rotation();
+ if (o != 0 && o != 180 && o != -180) {
+ glScalef (1/h, h, 1); /* #### not quite right */
+ h = 1.7;
+ glScalef (h, h, h);
+ }
+ }
+# endif
+
{
- GLfloat x = mp->rotx;
- GLfloat y = mp->roty;
- GLfloat z = mp->rotz;
- if (x < 0) x = 1 - (x + 1);
- if (y < 0) y = 1 - (y + 1);
- if (z < 0) z = 1 - (z + 1);
- 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);
+ double x, y, z;
+ get_rotation (mp->rot, &x, &y, &z, !mp->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);
}
/* moebius */
- draw_moebius_strip(mi);
+ if (!draw_moebius_strip(mi)) {
+ MI_ABORT(mi);
+ return;
+ }
glPopMatrix();
- rotate(&mp->rotx, &mp->dx, &mp->ddx, mp->d_max);
- rotate(&mp->roty, &mp->dy, &mp->ddy, mp->d_max);
- rotate(&mp->rotz, &mp->dz, &mp->ddz, mp->d_max);
-
- if (mi->fps_p) do_fps (mi);
+ if (MI_IS_FPS(mi)) do_fps (mi);
glFlush();
glXSwapBuffers(display, window);
mp->step += 0.025;
}
-void
-change_moebius(ModeInfo * mi)
+#ifndef STANDALONE
+ENTRYPOINT void
+change_moebius (ModeInfo * mi)
{
moebiusstruct *mp = &moebius[MI_SCREEN(mi)];
glXMakeCurrent(MI_DISPLAY(mi), MI_WINDOW(mi), *(mp->glx_context));
pinit();
}
+#endif /* !STANDALONE */
-void
-release_moebius(ModeInfo * mi)
-{
- if (moebius != NULL) {
- (void) free((void *) moebius);
- moebius = NULL;
- }
- if (glIsList(objects)) {
- glDeleteLists(objects, 3);
- }
- FreeAllGL(mi);
-}
+
+XSCREENSAVER_MODULE ("Moebius", moebius)
#endif