Initial revision

1 files changed, 240 insertions, 0 deletions

diff --git a/progs/demos/bounce.c b/progs/demos/bounce.c
new file mode 100644
index 0000000000..876ce589dc
--- /dev/null
+++ b/progs/demos/bounce.c
@@ -0,0 +1,240 @@
+/* $Id: bounce.c,v 1.1 1999/08/19 00:55:40 jtg Exp $ */
+
+/*
+ * Bouncing ball demo.  Color index mode only!
+ *
+ * This program is in the public domain
+ *
+ * Brian Paul
+ */
+
+/* Conversion to GLUT by Mark J. Kilgard */
+
+/*
+ * $Log: bounce.c,v $
+ * Revision 1.1  1999/08/19 00:55:40  jtg
+ * Initial revision
+ *
+ * Revision 3.3  1999/03/18 08:16:14  joukj
+ *
+ *     cmpstr needs string.h to included to avoid warnings
+ *
+ * Revision 3.2  1998/11/28 01:13:02  brianp
+ * now sets an initial window position and size
+ *
+ * Revision 3.1  1998/11/28 01:06:57  brianp
+ * now works in RGB mode by default
+ *
+ * Revision 3.0  1998/02/14 18:42:29  brianp
+ * initial rev
+ *
+ */
+
+
+#include <math.h>
+#include <stdlib.h>
+#include <string.h>
+#include <GL/glut.h>
+
+#define COS(X)   cos( (X) * 3.14159/180.0 )
+#define SIN(X)   sin( (X) * 3.14159/180.0 )
+
+#define RED 1
+#define WHITE 2
+#define CYAN 3
+
+GLboolean IndexMode = GL_FALSE;
+GLuint Ball;
+GLenum Mode;
+GLfloat Zrot = 0.0, Zstep = 6.0;
+GLfloat Xpos = 0.0, Ypos = 1.0;
+GLfloat Xvel = 0.2, Yvel = 0.0;
+GLfloat Xmin = -4.0, Xmax = 4.0;
+GLfloat Ymin = -3.8, Ymax = 4.0;
+GLfloat G = -0.1;
+
+static GLuint 
+make_ball(void)
+{
+  GLuint list;
+  GLfloat a, b;
+  GLfloat da = 18.0, db = 18.0;
+  GLfloat radius = 1.0;
+  GLuint color;
+  GLfloat x, y, z;
+
+  list = glGenLists(1);
+
+  glNewList(list, GL_COMPILE);
+
+  color = 0;
+  for (a = -90.0; a + da <= 90.0; a += da) {
+
+    glBegin(GL_QUAD_STRIP);
+    for (b = 0.0; b <= 360.0; b += db) {
+
+      if (color) {
+	glIndexi(RED);
+        glColor3f(1, 0, 0);
+      } else {
+	glIndexi(WHITE);
+        glColor3f(1, 1, 1);
+      }
+
+      x = COS(b) * COS(a);
+      y = SIN(b) * COS(a);
+      z = SIN(a);
+      glVertex3f(x, y, z);
+
+      x = radius * COS(b) * COS(a + da);
+      y = radius * SIN(b) * COS(a + da);
+      z = radius * SIN(a + da);
+      glVertex3f(x, y, z);
+
+      color = 1 - color;
+    }
+    glEnd();
+
+  }
+
+  glEndList();
+
+  return list;
+}
+
+static void 
+reshape(int width, int height)
+{
+  float aspect = (float) width / (float) height;
+  glViewport(0, 0, (GLint) width, (GLint) height);
+  glMatrixMode(GL_PROJECTION);
+  glLoadIdentity();
+  glOrtho(-6.0 * aspect, 6.0 * aspect, -6.0, 6.0, -6.0, 6.0);
+  glMatrixMode(GL_MODELVIEW);
+}
+
+/* ARGSUSED1 */
+static void
+key(unsigned char k, int x, int y)
+{
+  switch (k) {
+  case 27:  /* Escape */
+    exit(0);
+  }
+}
+
+static void 
+draw(void)
+{
+  GLint i;
+
+  glClear(GL_COLOR_BUFFER_BIT);
+
+  glIndexi(CYAN);
+  glColor3f(0, 1, 1);
+  glBegin(GL_LINES);
+  for (i = -5; i <= 5; i++) {
+    glVertex2i(i, -5);
+    glVertex2i(i, 5);
+  }
+  for (i = -5; i <= 5; i++) {
+    glVertex2i(-5, i);
+    glVertex2i(5, i);
+  }
+  for (i = -5; i <= 5; i++) {
+    glVertex2i(i, -5);
+    glVertex2f(i * 1.15, -5.9);
+  }
+  glVertex2f(-5.3, -5.35);
+  glVertex2f(5.3, -5.35);
+  glVertex2f(-5.75, -5.9);
+  glVertex2f(5.75, -5.9);
+  glEnd();
+
+  glPushMatrix();
+  glTranslatef(Xpos, Ypos, 0.0);
+  glScalef(2.0, 2.0, 2.0);
+  glRotatef(8.0, 0.0, 0.0, 1.0);
+  glRotatef(90.0, 1.0, 0.0, 0.0);
+  glRotatef(Zrot, 0.0, 0.0, 1.0);
+
+  glCallList(Ball);
+
+  glPopMatrix();
+
+  glFlush();
+  glutSwapBuffers();
+}
+
+static void 
+idle(void)
+{
+  static float vel0 = -100.0;
+
+  Zrot += Zstep;
+
+  Xpos += Xvel;
+  if (Xpos >= Xmax) {
+    Xpos = Xmax;
+    Xvel = -Xvel;
+    Zstep = -Zstep;
+  }
+  if (Xpos <= Xmin) {
+    Xpos = Xmin;
+    Xvel = -Xvel;
+    Zstep = -Zstep;
+  }
+  Ypos += Yvel;
+  Yvel += G;
+  if (Ypos < Ymin) {
+    Ypos = Ymin;
+    if (vel0 == -100.0)
+      vel0 = fabs(Yvel);
+    Yvel = vel0;
+  }
+  glutPostRedisplay();
+}
+
+void 
+visible(int vis)
+{
+  if (vis == GLUT_VISIBLE)
+    glutIdleFunc(idle);
+  else
+    glutIdleFunc(NULL);
+}
+
+int main(int argc, char *argv[])
+{
+  glutInit(&argc, argv);
+  glutInitWindowPosition(0, 0);
+  glutInitWindowSize(600, 450);
+
+
+  IndexMode = argc > 1 && strcmp(argv[1], "-ci") == 0;
+  if (IndexMode)
+     glutInitDisplayMode(GLUT_INDEX | GLUT_DOUBLE);
+  else
+     glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
+
+  glutCreateWindow("Bounce");
+  Ball = make_ball();
+  glCullFace(GL_BACK);
+  glEnable(GL_CULL_FACE);
+  glDisable(GL_DITHER);
+  glShadeModel(GL_FLAT);
+
+  glutDisplayFunc(draw);
+  glutReshapeFunc(reshape);
+  glutVisibilityFunc(visible);
+  glutKeyboardFunc(key);
+
+  if (IndexMode) {
+    glutSetColor(RED, 1.0, 0.0, 0.0);
+    glutSetColor(WHITE, 1.0, 1.0, 1.0);
+    glutSetColor(CYAN, 0.0, 1.0, 1.0);
+  }
+
+  glutMainLoop();
+  return 0;             /* ANSI C requires main to return int. */
+}