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110b2a9207
xenocara/app/xlockmore/modes/glx/stairs.c
matthieu 110b2a9207 Importing xlockmore 5.22
2006-11-26 11:07:42 +00:00

519 lines
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/* -*- Mode: C; tab-width: 4 -*- */
/* stairs --- Infinite Stairs, and Escher-like scene. */
#if !defined( lint ) && !defined( SABER )
static const char sccsid[] = "@(#)stairs.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,
* provided that the above copyright notice appear in all copies and that
* both that copyright notice and this permission notice appear in
* supporting documentation.
*
* This file is provided AS IS with no warranties of any kind. The author
* shall have no liability with respect to the infringement of copyrights,
* trade secrets or any patents by this file or any part thereof. In no
* event will the author be liable for any lost revenue or profits or
* other special, indirect and consequential damages.
*
* This mode shows some interesting scenes that are impossible OR very
* weird to build in the real universe. Much of the scenes are inspirated
* on Mauritz Cornelis stairs'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
* OpenGL at home.
*
* Since I'm not a native English speaker, my apologies for any grammatical
* mistakes.
*
* My e-mail address is
* mfvianna@centroin.com.br
*
* Marcelo F. Vianna (Jun-01-1997)
*
* Revision History:
* 01-Mar-2001: Added FPS stuff - Eric Lassauge <lassauge AT users.sourceforge.net>
* 01-Nov-2000: Allocation checks
* 07-Jan-1998: This would be a scene for the escher mode, but now escher mode
* was splitted in different modes for each scene. This is the
* initial release and is not working yet.
* Marcelo F. Vianna.
*/
/*-
* Texture mapping is only available on RGBA contexts, Mono and color index
* visuals DO NOT support texture mapping in OpenGL.
*
* BUT Mesa do implements RGBA contexts in pseudo color visuals, so texture
* mapping shuld work on PseudoColor, DirectColor, TrueColor using Mesa. Mono
* is not officially supported for both OpenGL and Mesa, but seems to not crash
* Mesa.
*
* In real OpenGL, PseudoColor DO NOT support texture map (as far as I know).
*/
#ifdef VMS
#include <X11/Intrinsic.h>
#endif
#ifdef STANDALONE
#define MODE_stairs
#define PROGCLASS "stairs"
#define HACK_INIT init_stairs
#define HACK_DRAW draw_stairs
#define stairs_opts xlockmore_opts
#define DEFAULTS "*delay: 200000 \n"
#include "xlockmore.h" /* from the xscreensaver distribution */
#else /* !STANDALONE */
#include "xlock.h" /* from the xlockmore distribution */
#include "visgl.h"
#endif /* !STANDALONE */
#ifdef MODE_stairs
#include <GL/glu.h>
#include "e_textures.h"
ModeSpecOpt stairs_opts =
{0, (XrmOptionDescRec *) NULL, 0, (argtype *) NULL, (OptionStruct *) NULL};
#ifdef USE_MODULES
ModStruct stairs_description =
{"stairs", "init_stairs", "draw_stairs", "release_stairs",
"draw_stairs", "change_stairs", (char *) NULL, &stairs_opts,
1000, 1, 1, 1, 4, 1.0, "",
"Shows Infinite Stairs, an Escher-like scene", 0, NULL};
#endif
#define Scale4Window 0.3
#define Scale4Iconic 0.4
#define sqr(A) ((A)*(A))
#ifndef Pi
#define Pi M_PI
#endif
#if 0
#define ObjSphere 0
#define MaxObj 1
#endif
/*************************************************************************/
typedef struct {
GLint WindH, WindW;
GLfloat step;
Bool direction;
#if 0
Bool AreObjectsDefined[MaxObj];
#endif
int sphere_position;
GLXContext *glx_context;
} stairsstruct;
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};
#if 0
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 MaterialMagenta[] =
{0.6, 0.2, 0.5, 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};
#endif
static float MaterialYellow[] =
{0.7, 0.7, 0.0, 1.0};
static float MaterialWhite[] =
{0.7, 0.7, 0.7, 1.0};
static float positions[] =
{
-2.5, 4.0, 0.0, /* First one is FUDGED :) */
-3.0, 3.25, 1.0,
-3.0, 4.4, 1.5,
-3.0, 3.05, 2.0,
-3.0, 4.2, 2.5,
-3.0, 2.85, 3.0,
-2.5, 4.0, 3.0,
-2.0, 2.75, 3.0,
-1.5, 3.9, 3.0,
-1.0, 2.65, 3.0,
-0.5, 3.8, 3.0,
0.0, 2.55, 3.0,
0.5, 3.7, 3.0,
1.0, 2.45, 3.0,
1.5, 3.6, 3.0,
2.0, 2.35, 3.0,
2.0, 3.5, 2.5,
2.0, 2.25, 2.0,
2.0, 3.4, 1.5,
2.0, 2.15, 1.0,
2.0, 3.3, 0.5,
2.0, 2.05, 0.0,
2.0, 3.2, -0.5,
2.0, 1.95, -1.0,
2.0, 3.1, -1.5,
2.0, 1.85, -2.0,
1.5, 2.9, -2.0,
1.0, 1.65, -2.0,
0.5, 2.7, -2.0,
0.0, 1.55, -2.0,
-0.5, 2.5, -2.0,
-1.0, 1.45, -2.0,
};
#define NPOSITIONS ((sizeof positions) / (sizeof positions[0]))
static stairsstruct *stairs = (stairsstruct *) NULL;
#if 0
static GLuint objects = 0;
#endif
#define PlankWidth 3.0
#define PlankHeight 0.35
#define PlankThickness 0.15
static Bool
mySphere(float radius)
{
GLUquadricObj *quadObj;
if ((quadObj = gluNewQuadric()) == 0)
return False;
gluQuadricDrawStyle(quadObj, (GLenum) GLU_FILL);
gluSphere(quadObj, radius, 16, 16);
gluDeleteQuadric(quadObj);
return True;
}
static void
draw_block(GLfloat width, GLfloat height, GLfloat thickness)
{
glBegin(GL_QUADS);
glNormal3f(0, 0, 1);
glTexCoord2f(0, 0);
glVertex3f(-width, -height, thickness);
glTexCoord2f(1, 0);
glVertex3f(width, -height, thickness);
glTexCoord2f(1, 1);
glVertex3f(width, height, thickness);
glTexCoord2f(0, 1);
glVertex3f(-width, height, thickness);
glNormal3f(0, 0, -1);
glTexCoord2f(0, 0);
glVertex3f(-width, height, -thickness);
glTexCoord2f(1, 0);
glVertex3f(width, height, -thickness);
glTexCoord2f(1, 1);
glVertex3f(width, -height, -thickness);
glTexCoord2f(0, 1);
glVertex3f(-width, -height, -thickness);
glNormal3f(0, 1, 0);
glTexCoord2f(0, 0);
glVertex3f(-width, height, thickness);
glTexCoord2f(1, 0);
glVertex3f(width, height, thickness);
glTexCoord2f(1, 1);
glVertex3f(width, height, -thickness);
glTexCoord2f(0, 1);
glVertex3f(-width, height, -thickness);
glNormal3f(0, -1, 0);
glTexCoord2f(0, 0);
glVertex3f(-width, -height, -thickness);
glTexCoord2f(1, 0);
glVertex3f(width, -height, -thickness);
glTexCoord2f(1, 1);
glVertex3f(width, -height, thickness);
glTexCoord2f(0, 1);
glVertex3f(-width, -height, thickness);
glNormal3f(1, 0, 0);
glTexCoord2f(0, 0);
glVertex3f(width, -height, thickness);
glTexCoord2f(1, 0);
glVertex3f(width, -height, -thickness);
glTexCoord2f(1, 1);
glVertex3f(width, height, -thickness);
glTexCoord2f(0, 1);
glVertex3f(width, height, thickness);
glNormal3f(-1, 0, 0);
glTexCoord2f(0, 0);
glVertex3f(-width, height, thickness);
glTexCoord2f(1, 0);
glVertex3f(-width, height, -thickness);
glTexCoord2f(1, 1);
glVertex3f(-width, -height, -thickness);
glTexCoord2f(0, 1);
glVertex3f(-width, -height, thickness);
glEnd();
}
static Bool
draw_stairs_internal(ModeInfo * mi)
{
stairsstruct *sp = &stairs[MI_SCREEN(mi)];
GLfloat X;
glPushMatrix();
glPushMatrix();
glTranslatef(-3.0, 0.1, 2.0);
for (X = 0; X < 2; X++) {
draw_block(0.5, 2.7 + 0.1 * X, 0.5);
glTranslatef(0.0, 0.1, -1.0);
}
glPopMatrix();
glTranslatef(-3.0, 0.0, 3.0);
glPushMatrix();
for (X = 0; X < 6; X++) {
draw_block(0.5, 2.6 - 0.1 * X, 0.5);
glTranslatef(1.0, -0.1, 0.0);
}
glTranslatef(-1.0, -0.9, -1.0);
for (X = 0; X < 5; X++) {
draw_block(0.5, 3.0 - 0.1 * X, 0.5);
glTranslatef(0.0, 0.0, -1.0);
}
glTranslatef(-1.0, -1.1, 1.0);
for (X = 0; X < 3; X++) {
draw_block(0.5, 3.5 - 0.1 * X, 0.5);
glTranslatef(-1.0, -0.1, 0.0);
}
glPopMatrix();
glPopMatrix();
glPushMatrix();
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialYellow);
glTranslatef((GLfloat) positions[sp->sphere_position],
(GLfloat) positions[sp->sphere_position + 1],
(GLfloat) positions[sp->sphere_position + 2]);
/* FUDGE sphere_position soo its not so obvious */
if (!mySphere((sp->sphere_position == 0) ? 0.48 : 0.5))
return False;
glPopMatrix();
sp->sphere_position += 3;
if (sp->sphere_position >= (int) NPOSITIONS)
sp->sphere_position = 0;
return True;
}
static void
reshape(ModeInfo * mi, int width, int height)
{
stairsstruct *sp = &stairs[MI_SCREEN(mi)];
int i;
glViewport(0, 0, sp->WindW = (GLint) width, sp->WindH = (GLint) height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 15.0);
glMatrixMode(GL_MODELVIEW);
i = width / 512 + 1;
glLineWidth(i);
glPointSize(i);
}
static void
pinit(void)
{
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);
glLightfv(GL_LIGHT1, GL_AMBIENT, ambient);
glLightfv(GL_LIGHT1, GL_DIFFUSE, diffuse);
glLightfv(GL_LIGHT1, GL_POSITION, position1);
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE, lmodel_twoside);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_LIGHT1);
glEnable(GL_NORMALIZE);
glFrontFace(GL_CCW);
glCullFace(GL_BACK);
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialWhite);
glShadeModel(GL_FLAT);
glEnable(GL_DEPTH_TEST);
glEnable(GL_TEXTURE_2D);
glEnable(GL_CULL_FACE);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
gluBuild2DMipmaps(GL_TEXTURE_2D, 3, WoodTextureWidth, WoodTextureHeight,
GL_RGB, GL_UNSIGNED_BYTE, WoodTextureData);
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);
glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, front_shininess);
glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, front_specular);
}
void
release_stairs(ModeInfo * mi)
{
if (stairs != NULL) {
#if 0
int screen;
for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++) {
stairsstruct *sp = &stairs[screen];
if (sp->glx_context) {
if (glIsList(objects)) {
glDeleteLists(objects, MaxObj);
objects = 0;
}
}
}
#endif
free(stairs);
stairs = (stairsstruct *) NULL;
}
FreeAllGL(mi);
}
void
init_stairs(ModeInfo * mi)
{
stairsstruct *sp;
if (stairs == NULL) {
if ((stairs = (stairsstruct *) calloc(MI_NUM_SCREENS(mi),
sizeof (stairsstruct))) == NULL)
return;
}
sp = &stairs[MI_SCREEN(mi)];
sp->step = 0.0;
sp->direction = LRAND() & 1;
sp->sphere_position = NRAND(NPOSITIONS / 3) * 3;
if ((sp->glx_context = init_GL(mi)) != NULL) {
reshape(mi, MI_WIDTH(mi), MI_HEIGHT(mi));
glDrawBuffer(GL_BACK);
#if 0
if (!glIsList(objects))
if ((objects = glGenLists(MaxObj)) == 0) {
MI_CLEARWINDOW(mi);
}
#endif
pinit();
} else {
MI_CLEARWINDOW(mi);
}
}
void
draw_stairs(ModeInfo * mi)
{
Display *display = MI_DISPLAY(mi);
Window window = MI_WINDOW(mi);
stairsstruct *sp;
if (stairs == NULL)
return;
sp = &stairs[MI_SCREEN(mi)];
MI_IS_DRAWN(mi) = True;
if (!sp->glx_context)
return;
glXMakeCurrent(display, window, *(sp->glx_context));
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glTranslatef(0.0, 0.0, -10.0);
if (!MI_IS_ICONIC(mi)) {
glScalef(Scale4Window * sp->WindH / sp->WindW, Scale4Window, Scale4Window);
} else {
glScalef(Scale4Iconic * sp->WindH / sp->WindW, Scale4Iconic, Scale4Iconic);
}
glRotatef(44.5, 1, 0, 0);
glRotatef(50 + ((sp->direction) ? 1 : -1) *
((sp->step * 100 > 120) ? sp->step * 100 - 120 : 0), 0, 1, 0);
if (sp->step * 100 >= 360 + 120) { /* stop showing secrets */
sp->step = 0;
sp->direction = LRAND() & 1;
}
if (!draw_stairs_internal(mi)) {
release_stairs(mi);
return;
}
glPopMatrix();
if (MI_IS_FPS(mi)) do_fps (mi);
glFlush();
glXSwapBuffers(display, window);
sp->step += 0.025;
}
void
change_stairs(ModeInfo * mi)
{
stairsstruct *sp;
if (stairs == NULL)
return;
sp = &stairs[MI_SCREEN(mi)];
if (!sp->glx_context)
return;
glXMakeCurrent(MI_DISPLAY(mi), MI_WINDOW(mi), *(sp->glx_context));
pinit();
}
#endif
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