/* cage --- the Impossible Cage, an Escher like scene. */
#if !defined( lint ) && !defined( SABER )
-static const char sccsid[] = "@(#)cage.c 4.07 98/01/04 xlockmore";
+static const char sccsid[] = "@(#)cage.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: Added FPS stuff E.Lassauge <lassauge@mail.dotcom.fr>
+ * 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).
*/
+#ifdef VMS
+/*-
+ * due to a Bug/feature in VMS X11/Intrinsic.h has to be placed before xlock.
+ * otherwise caddr_t is not defined correctly
+ */
#include <X11/Intrinsic.h>
+#endif
#ifdef STANDALONE
+# define MODE_cage
# define PROGCLASS "Cage"
# define HACK_INIT init_cage
# define HACK_DRAW draw_cage
-# define HACK_RESHAPE reshape_cage
+# define HACK_RESHAPE reshape
# define cage_opts xlockmore_opts
# define DEFAULTS "*delay: 25000 \n" \
"*showFPS: False \n" \
#endif /* !STANDALONE */
-#ifdef USE_GL
+#ifdef MODE_cage
#include <GL/glu.h>
#include "e_textures.h"
ModeSpecOpt cage_opts =
-{0, NULL, 0, NULL, NULL};
+{0, (XrmOptionDescRec *) NULL, 0, (argtype *) NULL, (OptionStruct *) NULL};
#ifdef USE_MODULES
ModStruct cage_description =
{"cage", "init_cage", "draw_cage", "release_cage",
- "draw_cage", "change_cage", NULL, &cage_opts,
- 1000, 1, 1, 1, 1.0, 4, "",
+ "draw_cage", "change_cage", (char *) NULL, &cage_opts,
+ 25000, 1, 1, 1, 1.0, 4, "",
"Shows the Impossible Cage, an Escher-like GL scene", 0, NULL};
#endif
#define Pi M_PI
#endif
+#define ObjWoodPlank 0
+#define MaxObj 1
+
/*************************************************************************/
typedef struct {
GLint WindH, WindW;
GLfloat step;
- int AreObjectsDefined[1];
GLXContext *glx_context;
} cagestruct;
static float MaterialWhite[] =
{0.7, 0.7, 0.7, 1.0};
-static cagestruct *cage = NULL;
-static GLuint objects;
-
-#define ObjWoodPlank 0
+static cagestruct *cage = (cagestruct *) NULL;
#define PlankWidth 3.0
#define PlankHeight 0.35
#define PlankThickness 0.15
-static void
+static Bool
draw_woodplank(cagestruct * cp)
{
- if (!cp->AreObjectsDefined[ObjWoodPlank]) {
- glNewList(objects + ObjWoodPlank, GL_COMPILE_AND_EXECUTE);
- glBegin(GL_QUADS);
- glNormal3f(0, 0, 1);
- glTexCoord2f(0, 0);
- glVertex3f(-PlankWidth, -PlankHeight, PlankThickness);
- glTexCoord2f(1, 0);
- glVertex3f(PlankWidth, -PlankHeight, PlankThickness);
- glTexCoord2f(1, 1);
- glVertex3f(PlankWidth, PlankHeight, PlankThickness);
- glTexCoord2f(0, 1);
- glVertex3f(-PlankWidth, PlankHeight, PlankThickness);
- glNormal3f(0, 0, -1);
- glTexCoord2f(0, 0);
- glVertex3f(-PlankWidth, PlankHeight, -PlankThickness);
- glTexCoord2f(1, 0);
- glVertex3f(PlankWidth, PlankHeight, -PlankThickness);
- glTexCoord2f(1, 1);
- glVertex3f(PlankWidth, -PlankHeight, -PlankThickness);
- glTexCoord2f(0, 1);
- glVertex3f(-PlankWidth, -PlankHeight, -PlankThickness);
- glNormal3f(0, 1, 0);
- glTexCoord2f(0, 0);
- glVertex3f(-PlankWidth, PlankHeight, PlankThickness);
- glTexCoord2f(1, 0);
- glVertex3f(PlankWidth, PlankHeight, PlankThickness);
- glTexCoord2f(1, 1);
- glVertex3f(PlankWidth, PlankHeight, -PlankThickness);
- glTexCoord2f(0, 1);
- glVertex3f(-PlankWidth, PlankHeight, -PlankThickness);
- glNormal3f(0, -1, 0);
- glTexCoord2f(0, 0);
- glVertex3f(-PlankWidth, -PlankHeight, -PlankThickness);
- glTexCoord2f(1, 0);
- glVertex3f(PlankWidth, -PlankHeight, -PlankThickness);
- glTexCoord2f(1, 1);
- glVertex3f(PlankWidth, -PlankHeight, PlankThickness);
- glTexCoord2f(0, 1);
- glVertex3f(-PlankWidth, -PlankHeight, PlankThickness);
- glNormal3f(1, 0, 0);
- glTexCoord2f(0, 0);
- glVertex3f(PlankWidth, -PlankHeight, PlankThickness);
- glTexCoord2f(1, 0);
- glVertex3f(PlankWidth, -PlankHeight, -PlankThickness);
- glTexCoord2f(1, 1);
- glVertex3f(PlankWidth, PlankHeight, -PlankThickness);
- glTexCoord2f(0, 1);
- glVertex3f(PlankWidth, PlankHeight, PlankThickness);
- glNormal3f(-1, 0, 0);
- glTexCoord2f(0, 0);
- glVertex3f(-PlankWidth, PlankHeight, PlankThickness);
- glTexCoord2f(1, 0);
- glVertex3f(-PlankWidth, PlankHeight, -PlankThickness);
- glTexCoord2f(1, 1);
- glVertex3f(-PlankWidth, -PlankHeight, -PlankThickness);
- glTexCoord2f(0, 1);
- glVertex3f(-PlankWidth, -PlankHeight, PlankThickness);
- glEnd();
- glEndList();
- cp->AreObjectsDefined[ObjWoodPlank] = 1;
-#ifdef DEBUG_LISTS
- (void) printf("WoodPlank drawn SLOWLY\n");
-#endif
- } else {
- glCallList(objects + ObjWoodPlank);
-#ifdef DEBUG_LISTS
- (void) printf("WoodPlank drawn quickly\n");
-#endif
- }
+ glBegin(GL_QUADS);
+ glNormal3f(0, 0, 1);
+ glTexCoord2f(0, 0);
+ glVertex3f(-PlankWidth, -PlankHeight, PlankThickness);
+ glTexCoord2f(1, 0);
+ glVertex3f(PlankWidth, -PlankHeight, PlankThickness);
+ glTexCoord2f(1, 1);
+ glVertex3f(PlankWidth, PlankHeight, PlankThickness);
+ glTexCoord2f(0, 1);
+ glVertex3f(-PlankWidth, PlankHeight, PlankThickness);
+ glNormal3f(0, 0, -1);
+ glTexCoord2f(0, 0);
+ glVertex3f(-PlankWidth, PlankHeight, -PlankThickness);
+ glTexCoord2f(1, 0);
+ glVertex3f(PlankWidth, PlankHeight, -PlankThickness);
+ glTexCoord2f(1, 1);
+ glVertex3f(PlankWidth, -PlankHeight, -PlankThickness);
+ glTexCoord2f(0, 1);
+ glVertex3f(-PlankWidth, -PlankHeight, -PlankThickness);
+ glNormal3f(0, 1, 0);
+ glTexCoord2f(0, 0);
+ glVertex3f(-PlankWidth, PlankHeight, PlankThickness);
+ glTexCoord2f(1, 0);
+ glVertex3f(PlankWidth, PlankHeight, PlankThickness);
+ glTexCoord2f(1, 1);
+ glVertex3f(PlankWidth, PlankHeight, -PlankThickness);
+ glTexCoord2f(0, 1);
+ glVertex3f(-PlankWidth, PlankHeight, -PlankThickness);
+ glNormal3f(0, -1, 0);
+ glTexCoord2f(0, 0);
+ glVertex3f(-PlankWidth, -PlankHeight, -PlankThickness);
+ glTexCoord2f(1, 0);
+ glVertex3f(PlankWidth, -PlankHeight, -PlankThickness);
+ glTexCoord2f(1, 1);
+ glVertex3f(PlankWidth, -PlankHeight, PlankThickness);
+ glTexCoord2f(0, 1);
+ glVertex3f(-PlankWidth, -PlankHeight, PlankThickness);
+ glNormal3f(1, 0, 0);
+ glTexCoord2f(0, 0);
+ glVertex3f(PlankWidth, -PlankHeight, PlankThickness);
+ glTexCoord2f(1, 0);
+ glVertex3f(PlankWidth, -PlankHeight, -PlankThickness);
+ glTexCoord2f(1, 1);
+ glVertex3f(PlankWidth, PlankHeight, -PlankThickness);
+ glTexCoord2f(0, 1);
+ glVertex3f(PlankWidth, PlankHeight, PlankThickness);
+ glNormal3f(-1, 0, 0);
+ glTexCoord2f(0, 0);
+ glVertex3f(-PlankWidth, PlankHeight, PlankThickness);
+ glTexCoord2f(1, 0);
+ glVertex3f(-PlankWidth, PlankHeight, -PlankThickness);
+ glTexCoord2f(1, 1);
+ glVertex3f(-PlankWidth, -PlankHeight, -PlankThickness);
+ glTexCoord2f(0, 1);
+ glVertex3f(-PlankWidth, -PlankHeight, PlankThickness);
+ glEnd();
+
+ return True;
}
-static void
+static Bool
draw_impossiblecage(cagestruct * cp)
{
glPushMatrix();
glRotatef(90, 0, 1, 0);
glTranslatef(0.0, PlankHeight - PlankWidth, -PlankThickness - PlankWidth);
- draw_woodplank(cp);
+ if (!draw_woodplank(cp))
+ return False;
glPopMatrix();
glPushMatrix();
glRotatef(90, 0, 0, 1);
glTranslatef(0.0, PlankHeight - PlankWidth, PlankWidth - PlankThickness);
- draw_woodplank(cp);
+ if (!draw_woodplank(cp))
+ return False;
glPopMatrix();
glPushMatrix();
glRotatef(90, 0, 1, 0);
glTranslatef(0.0, PlankWidth - PlankHeight, -PlankThickness - PlankWidth);
- draw_woodplank(cp);
+ if (!draw_woodplank(cp))
+ return False;
glPopMatrix();
glPushMatrix();
glTranslatef(0.0, PlankWidth - PlankHeight, 3 * PlankThickness - PlankWidth);
- draw_woodplank(cp);
+ if (!draw_woodplank(cp))
+ return False;
glPopMatrix();
glPushMatrix();
glRotatef(90, 0, 0, 1);
glTranslatef(0.0, PlankWidth - PlankHeight, PlankWidth - PlankThickness);
- draw_woodplank(cp);
+ if (!draw_woodplank(cp))
+ return False;
glPopMatrix();
glPushMatrix();
glTranslatef(0.0, PlankWidth - PlankHeight, PlankWidth - 3 * PlankThickness);
- draw_woodplank(cp);
+ if (!draw_woodplank(cp))
+ return False;
glPopMatrix();
glPushMatrix();
glTranslatef(0.0, PlankHeight - PlankWidth, 3 * PlankThickness - PlankWidth);
- draw_woodplank(cp);
+ if (!draw_woodplank(cp))
+ return False;
glPopMatrix();
glPushMatrix();
glRotatef(90, 0, 0, 1);
glTranslatef(0.0, PlankHeight - PlankWidth, PlankThickness - PlankWidth);
- draw_woodplank(cp);
+ if (!draw_woodplank(cp))
+ return False;
glPopMatrix();
glPushMatrix();
glTranslatef(0.0, PlankHeight - PlankWidth, PlankWidth - 3 * PlankThickness);
- draw_woodplank(cp);
+ if (!draw_woodplank(cp))
+ return False;
glPopMatrix();
glPushMatrix();
glRotatef(90, 0, 1, 0);
glTranslatef(0.0, PlankHeight - PlankWidth, PlankWidth + PlankThickness);
- draw_woodplank(cp);
+ if (!draw_woodplank(cp))
+ return False;
glPopMatrix();
glPushMatrix();
glRotatef(90, 0, 0, 1);
glTranslatef(0.0, PlankWidth - PlankHeight, PlankThickness - PlankWidth);
- draw_woodplank(cp);
+ if (!draw_woodplank(cp))
+ return False;
glPopMatrix();
glPushMatrix();
glRotatef(90, 0, 1, 0);
glTranslatef(0.0, PlankWidth - PlankHeight, PlankWidth + PlankThickness);
- draw_woodplank(cp);
+ if (!draw_woodplank(cp))
+ return False;
glPopMatrix();
+ return True;
}
void
-reshape_cage(ModeInfo * mi, int width, int height)
+reshape(ModeInfo * mi, int width, int height)
{
cagestruct *cp = &cage[MI_SCREEN(mi)];
+ int i;
glViewport(0, 0, cp->WindW = (GLint) width, cp->WindH = (GLint) height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 15.0);
glMatrixMode(GL_MODELVIEW);
- if (width >= 1024) {
- glLineWidth(3);
- glPointSize(3);
- } else if (width >= 512) {
- glLineWidth(2);
- glPointSize(2);
- } else {
- glLineWidth(1);
- glPointSize(1);
- }
- cp->AreObjectsDefined[ObjWoodPlank] = 0;
+ i = width / 512 + 1;
+ glLineWidth(i);
+ glPointSize(i);
}
static void
-pinit(void)
+pinit(ModeInfo *mi)
{
- int status;
+ int status;
glClearDepth(1.0);
glClearColor(0.0, 0.0, 0.0, 1.0);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
- clear_gl_error();
- status = gluBuild2DMipmaps(GL_TEXTURE_2D, 3,
- WoodTextureWidth, WoodTextureHeight,
- GL_RGB, GL_UNSIGNED_BYTE, WoodTextureData);
- if (status)
- {
- const char *s = gluErrorString (status);
- fprintf (stderr, "%s: error mipmapping texture: %s\n",
- progname, (s ? s : "(unknown)"));
- exit (1);
- }
- check_gl_error("mipmapping");
+ clear_gl_error();
+ if (MI_IS_MONO(mi))
+ status = 0;
+ else
+ status = gluBuild2DMipmaps(GL_TEXTURE_2D, 3,
+ WoodTextureWidth, WoodTextureHeight,
+ GL_RGB, GL_UNSIGNED_BYTE, WoodTextureData);
+ if (status)
+ {
+ const char *s = gluErrorString (status);
+ fprintf (stderr, "%s: error mipmapping texture: %s\n",
+ progname, (s ? s : "(unknown)"));
+ exit (1);
+ }
+ check_gl_error("mipmapping");
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, front_specular);
}
+void
+release_cage(ModeInfo * mi)
+{
+ if (cage != NULL) {
+ int screen;
+
+ for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++) {
+ cagestruct *cp = &cage[screen];
+
+ if (cp->glx_context) {
+ cp->glx_context = (GLXContext *) NULL;
+ }
+ }
+ (void) free((void *) cage);
+ cage = (cagestruct *) NULL;
+ }
+ FreeAllGL(mi);
+}
+
void
init_cage(ModeInfo * mi)
{
- int screen = MI_SCREEN(mi);
cagestruct *cp;
if (cage == NULL) {
sizeof (cagestruct))) == NULL)
return;
}
- cp = &cage[screen];
- cp->step = NRAND(90);
+ cp = &cage[MI_SCREEN(mi)];
+ cp->step = NRAND(90);
if ((cp->glx_context = init_GL(mi)) != NULL) {
- reshape_cage(mi, MI_WIDTH(mi), MI_HEIGHT(mi));
+ reshape(mi, MI_WIDTH(mi), MI_HEIGHT(mi));
glDrawBuffer(GL_BACK);
- if (!glIsList(objects))
- objects = glGenLists(1);
- pinit();
+ pinit(mi);
} else {
MI_CLEARWINDOW(mi);
}
void
draw_cage(ModeInfo * mi)
{
- cagestruct *cp = &cage[MI_SCREEN(mi)];
-
Display *display = MI_DISPLAY(mi);
Window window = MI_WINDOW(mi);
+ cagestruct *cp;
- MI_IS_DRAWN(mi) = True;
+ if (cage == NULL)
+ return;
+ cp = &cage[MI_SCREEN(mi)];
+ MI_IS_DRAWN(mi) = True;
if (!cp->glx_context)
return;
glRotatef(cp->step * 100, 0, 0, 1);
glRotatef(25 + cos(cp->step * 5) * 6, 1, 0, 0);
glRotatef(204.5 - sin(cp->step * 5) * 8, 0, 1, 0);
- draw_impossiblecage(cp);
+ if (!draw_impossiblecage(cp)) {
+ release_cage(mi);
+ return;
+ }
glPopMatrix();
-
- if (mi->fps_p) do_fps (mi);
+ if (MI_IS_FPS(mi)) do_fps (mi);
glFlush();
glXSwapBuffers(display, window);
return;
glXMakeCurrent(MI_DISPLAY(mi), MI_WINDOW(mi), *(cp->glx_context));
- pinit();
-}
-
-void
-release_cage(ModeInfo * mi)
-{
- if (cage != NULL) {
- (void) free((void *) cage);
- cage = NULL;
- }
- if (glIsList(objects)) {
- glDeleteLists(objects, 1);
- }
- FreeAllGL(mi);
+ pinit(mi);
}
#endif
projects / xscreensaver / blobdiff