# define HACK_DRAW draw_gasket
# define HACK_RESHAPE reshape_gasket
# define gasket_opts xlockmore_opts
-# define DEFAULTS "*count: 1 \n" \
- "*cycles: 9999 \n" \
- "*delay: 20000 \n" \
+# define DEFAULTS "*delay: 20000 \n" \
"*maxDepth: 5 \n" \
"*speed: 150 \n" \
"*showFPS: False \n" \
GLfloat d_max; /* max velocity */
GLfloat angle;
- GLuint gasket1;
+ GLuint gasket0, gasket1, gasket2, gasket3;
GLXContext *glx_context;
Window window;
int ncolors;
XColor *colors;
- int ccolor;
+ int ccolor0;
+ int ccolor1;
+ int ccolor2;
+ int ccolor3;
} gasketstruct;
#include <GL/glu.h>
-/* static GLuint limit; */
-
-\f
-/* Computing normal vectors (thanks to Nat Friedman <ndf@mit.edu>)
- */
-
-typedef struct vector {
- GLfloat x, y, z;
-} vector;
-
-typedef struct plane {
- vector p1, p2, p3;
-} plane;
-
-static void
-vector_set(vector *v, GLfloat x, GLfloat y, GLfloat z)
-{
- v->x = x;
- v->y = y;
- v->z = z;
-}
-
-static void
-vector_cross(vector v1, vector v2, vector *v3)
-{
- v3->x = (v1.y * v2.z) - (v1.z * v2.y);
- v3->y = (v1.z * v2.x) - (v1.x * v2.z);
- v3->z = (v1.x * v2.y) - (v1.y * v2.x);
-}
-
-static void
-vector_subtract(vector v1, vector v2, vector *res)
-{
- res->x = v1.x - v2.x;
- res->y = v1.y - v2.y;
- res->z = v1.z - v2.z;
-}
-
-static void
-plane_normal(plane p, vector *n)
-{
- vector v1, v2;
- vector_subtract(p.p1, p.p2, &v1);
- vector_subtract(p.p1, p.p3, &v2);
- vector_cross(v2, v1, n);
-}
-
-static void
-do_normal(GLfloat x1, GLfloat y1, GLfloat z1,
- GLfloat x2, GLfloat y2, GLfloat z2,
- GLfloat x3, GLfloat y3, GLfloat z3)
-{
- plane plane;
- vector n;
- vector_set(&plane.p1, x1, y1, z1);
- vector_set(&plane.p2, x2, y2, z2);
- vector_set(&plane.p3, x3, y3, z3);
- plane_normal(plane, &n);
- n.x = -n.x; n.y = -n.y; n.z = -n.z;
-
- glNormal3f(n.x, n.y, n.z);
-
-#ifdef DEBUG
- /* Draw a line in the direction of this face's normal. */
- {
- GLfloat ax = n.x > 0 ? n.x : -n.x;
- GLfloat ay = n.y > 0 ? n.y : -n.y;
- GLfloat az = n.z > 0 ? n.z : -n.z;
- GLfloat mx = (x1 + x2 + x3) / 3;
- GLfloat my = (y1 + y2 + y3) / 3;
- GLfloat mz = (z1 + z2 + z3) / 3;
- GLfloat xx, yy, zz;
-
- GLfloat max = ax > ay ? ax : ay;
- if (az > max) max = az;
- max *= 2;
- xx = n.x / max;
- yy = n.y / max;
- zz = n.z / max;
-
- glBegin(GL_LINE_LOOP);
- glVertex3f(mx, my, mz);
- glVertex3f(mx+xx, my+yy, mz+zz);
- glEnd();
- }
-#endif /* DEBUG */
-}
+static GLfloat normals[4][3];
\f
if (wireframe_p)
glBegin (GL_LINE_LOOP);
else
- {
- do_normal (x1, y1, z1, x2, y2, z2, x3, y3, z3);
- glBegin (GL_TRIANGLES);
- }
+ glBegin (GL_TRIANGLES);
glVertex3f (x1, y1, z1);
glVertex3f (x2, y2, z2);
glVertex3f (x3, y3, z3);
}
static void
-four_tetras (GL_VECTOR *outer, Bool wireframe_p, int countdown)
+four_tetras (GL_VECTOR *outer, Bool wireframe_p, int countdown, int which)
{
if (countdown <= 0)
{
- triangle (outer[0].x, outer[0].y, outer[0].z,
- outer[1].x, outer[1].y, outer[1].z,
- outer[2].x, outer[2].y, outer[2].z,
- wireframe_p);
- triangle (outer[0].x, outer[0].y, outer[0].z,
- outer[3].x, outer[3].y, outer[3].z,
- outer[1].x, outer[1].y, outer[1].z,
- wireframe_p);
- triangle (outer[0].x, outer[0].y, outer[0].z,
- outer[2].x, outer[2].y, outer[2].z,
- outer[3].x, outer[3].y, outer[3].z,
- wireframe_p);
- triangle (outer[1].x, outer[1].y, outer[1].z,
- outer[3].x, outer[3].y, outer[3].z,
- outer[2].x, outer[2].y, outer[2].z,
- wireframe_p);
+ if (which == 0)
+ {
+ glNormal3f (normals[0][0], normals[0][1], normals[0][2]);
+ triangle (outer[0].x, outer[0].y, outer[0].z,
+ outer[1].x, outer[1].y, outer[1].z,
+ outer[2].x, outer[2].y, outer[2].z,
+ wireframe_p);
+ }
+ else if (which == 1)
+ {
+ glNormal3f (normals[1][0], normals[1][1], normals[1][2]);
+ triangle (outer[0].x, outer[0].y, outer[0].z,
+ outer[3].x, outer[3].y, outer[3].z,
+ outer[1].x, outer[1].y, outer[1].z,
+ wireframe_p);
+ }
+ else if (which == 2)
+ {
+ glNormal3f (normals[2][0], normals[2][1], normals[2][2]);
+ triangle (outer[0].x, outer[0].y, outer[0].z,
+ outer[2].x, outer[2].y, outer[2].z,
+ outer[3].x, outer[3].y, outer[3].z,
+ wireframe_p);
+ }
+ else
+ {
+ glNormal3f (normals[3][0], normals[3][1], normals[3][2]);
+ triangle (outer[1].x, outer[1].y, outer[1].z,
+ outer[3].x, outer[3].y, outer[3].z,
+ outer[2].x, outer[2].y, outer[2].z,
+ wireframe_p);
+ }
}
else
{
corner[1] = inner[M01];
corner[2] = inner[M02];
corner[3] = inner[M03];
- four_tetras (corner, wireframe_p, countdown);
+ four_tetras (corner, wireframe_p, countdown, which);
corner[0] = inner[M01];
corner[1] = outer[1];
corner[2] = inner[M12];
corner[3] = inner[M13];
- four_tetras (corner, wireframe_p, countdown);
+ four_tetras (corner, wireframe_p, countdown, which);
corner[0] = inner[M02];
corner[1] = inner[M12];
corner[2] = outer[2];
corner[3] = inner[M23];
- four_tetras (corner, wireframe_p, countdown);
+ four_tetras (corner, wireframe_p, countdown, which);
corner[0] = inner[M03];
corner[1] = inner[M13];
corner[2] = inner[M23];
corner[3] = outer[3];
- four_tetras (corner, wireframe_p, countdown);
+ four_tetras (corner, wireframe_p, countdown, which);
}
}
static void
-compile_gasket(ModeInfo *mi)
+compile_gasket(ModeInfo *mi, int which)
{
Bool wireframe_p = MI_IS_WIREFRAME(mi);
gasketstruct *gp = &gasket[MI_SCREEN(mi)];
GL_VECTOR vertex[5];
+ normals[0][0] = 0;
+ normals[0][1] = 0;
+ normals[0][2] = -sqrt(2.0 / 3.0);
+
+ normals[1][0] = 0;
+ normals[1][1] = -sqrt(0.75);
+ normals[1][2] = sqrt(2.0 / 3.0) / 3.0;
+
+ normals[2][0] = sqrt (0.5);
+ normals[2][1] = sqrt(0.75) / 2.0;
+ normals[2][2] = normals[1][2];
+
+ normals[3][0] = -normals[2][0];
+ normals[3][1] = normals[2][1];
+ normals[3][2] = normals[1][2];
+
+
/* define verticies */
vertex[0].x = 0.5;
vertex[0].y = -(1.0/3.0)*sqrt((2.0/3.0));
four_tetras (vertex, wireframe_p,
(gp->current_depth < 0
- ? -gp->current_depth : gp->current_depth));
+ ? -gp->current_depth : gp->current_depth),
+ which);
}
static void
{
Bool wireframe_p = MI_IS_WIREFRAME(mi);
gasketstruct *gp = &gasket[MI_SCREEN(mi)];
- static int tick = 0;
+ static int tick = 999999;
static GLfloat pos[4] = {-4.0, 3.0, 10.0, 1.0};
static float white[] = {1.0, 1.0, 1.0, 1.0};
- static float color[] = {0.0, 0.0, 0.0, 1.0};
+ static float color0[] = {0.0, 0.0, 0.0, 1.0};
+ static float color1[] = {0.0, 0.0, 0.0, 1.0};
+ static float color2[] = {0.0, 0.0, 0.0, 1.0};
+ static float color3[] = {0.0, 0.0, 0.0, 1.0};
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLightfv(GL_LIGHT0, GL_POSITION, pos);
- color[0] = gp->colors[gp->ccolor].red / 65536.0;
- color[1] = gp->colors[gp->ccolor].green / 65536.0;
- color[2] = gp->colors[gp->ccolor].blue / 65536.0;
- gp->ccolor++;
- if (gp->ccolor >= gp->ncolors) gp->ccolor = 0;
+ color0[0] = gp->colors[gp->ccolor0].red / 65536.0;
+ color0[1] = gp->colors[gp->ccolor0].green / 65536.0;
+ color0[2] = gp->colors[gp->ccolor0].blue / 65536.0;
- glMaterialfv (GL_FRONT, GL_AMBIENT_AND_DIFFUSE, color);
+ color1[0] = gp->colors[gp->ccolor1].red / 65536.0;
+ color1[1] = gp->colors[gp->ccolor1].green / 65536.0;
+ color1[2] = gp->colors[gp->ccolor1].blue / 65536.0;
+
+ color2[0] = gp->colors[gp->ccolor2].red / 65536.0;
+ color2[1] = gp->colors[gp->ccolor2].green / 65536.0;
+ color2[2] = gp->colors[gp->ccolor2].blue / 65536.0;
+
+ color3[0] = gp->colors[gp->ccolor3].red / 65536.0;
+ color3[1] = gp->colors[gp->ccolor3].green / 65536.0;
+ color3[2] = gp->colors[gp->ccolor3].blue / 65536.0;
+
+ gp->ccolor0++;
+ gp->ccolor1++;
+ gp->ccolor2++;
+ gp->ccolor3++;
+ if (gp->ccolor0 >= gp->ncolors) gp->ccolor0 = 0;
+ if (gp->ccolor1 >= gp->ncolors) gp->ccolor1 = 0;
+ if (gp->ccolor2 >= gp->ncolors) gp->ccolor2 = 0;
+ if (gp->ccolor3 >= gp->ncolors) gp->ccolor3 = 0;
glShadeModel(GL_SMOOTH);
}
glScalef( 8.0, 8.0, 8.0 );
+
+ glMaterialfv (GL_FRONT, GL_AMBIENT_AND_DIFFUSE, color0);
+ glCallList(gp->gasket0);
+ glMaterialfv (GL_FRONT, GL_AMBIENT_AND_DIFFUSE, color1);
glCallList(gp->gasket1);
+ glMaterialfv (GL_FRONT, GL_AMBIENT_AND_DIFFUSE, color2);
+ glCallList(gp->gasket2);
+ glMaterialfv (GL_FRONT, GL_AMBIENT_AND_DIFFUSE, color3);
+ glCallList(gp->gasket3);
glPopMatrix();
gp->current_depth = -max_depth;
gp->current_depth++;
+ /* We make four different lists so that each face of the tetrahedrons
+ can have a different color (all triangles facing in the same
+ direction have the same color, which is different from all
+ triangles facing in other directions.)
+ */
+ glDeleteLists (gp->gasket0, 1);
glDeleteLists (gp->gasket1, 1);
- glNewList (gp->gasket1, GL_COMPILE);
- compile_gasket (mi);
- glEndList();
+ glDeleteLists (gp->gasket2, 1);
+ glDeleteLists (gp->gasket3, 1);
+ glNewList (gp->gasket0, GL_COMPILE); compile_gasket (mi, 0); glEndList();
+ glNewList (gp->gasket1, GL_COMPILE); compile_gasket (mi, 1); glEndList();
+ glNewList (gp->gasket2, GL_COMPILE); compile_gasket (mi, 2); glEndList();
+ glNewList (gp->gasket3, GL_COMPILE); compile_gasket (mi, 3); glEndList();
}
}
gasketstruct *gp = &gasket[MI_SCREEN(mi)];
/* draw the gasket */
+ gp->gasket0 = glGenLists(1);
gp->gasket1 = glGenLists(1);
+ gp->gasket2 = glGenLists(1);
+ gp->gasket3 = glGenLists(1);
gp->current_depth = 1; /* start out at level 1, not 0 */
- glNewList(gp->gasket1, GL_COMPILE);
- compile_gasket(mi);
- glEndList();
}
make_smooth_colormap (0, 0, 0,
gp->colors, &gp->ncolors,
False, 0, False);
+ gp->ccolor0 = 0;
+ gp->ccolor1 = gp->ncolors * 0.25;
+ gp->ccolor2 = gp->ncolors * 0.5;
+ gp->ccolor3 = gp->ncolors * 0.75;
if ((gp->glx_context = init_GL(mi)) != NULL)
{
/* Display lists MUST be freed while their glXContext is current. */
glXMakeCurrent(MI_DISPLAY(mi), gp->window, *(gp->glx_context));
+ if (glIsList(gp->gasket0)) glDeleteLists(gp->gasket0, 1);
if (glIsList(gp->gasket1)) glDeleteLists(gp->gasket1, 1);
+ if (glIsList(gp->gasket2)) glDeleteLists(gp->gasket2, 1);
+ if (glIsList(gp->gasket3)) glDeleteLists(gp->gasket3, 1);
}
}
(void) free((void *) gasket);
projects / xscreensaver / blobdiff