1 files changed, 217 insertions, 0 deletions
diff --git a/nx-X11/extras/Mesa_6.4.2/progs/redbook/pickdepth.c b/nx-X11/extras/Mesa_6.4.2/progs/redbook/pickdepth.c
new file mode 100644
index 000000000..ad5bdc819
--- /dev/null
+++ b/nx-X11/extras/Mesa_6.4.2/progs/redbook/pickdepth.c
@@ -0,0 +1,217 @@
+
+/* Copyright (c) Mark J. Kilgard, 1994. */
+
+/*
+ * (c) Copyright 1993, Silicon Graphics, Inc.
+ * ALL RIGHTS RESERVED
+ * Permission to use, copy, modify, and distribute this software for
+ * any purpose and without fee is hereby granted, provided that the above
+ * copyright notice appear in all copies and that both the copyright notice
+ * and this permission notice appear in supporting documentation, and that
+ * the name of Silicon Graphics, Inc. not be used in advertising
+ * or publicity pertaining to distribution of the software without specific,
+ * written prior permission.
+ *
+ * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
+ * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
+ * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
+ * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
+ * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
+ * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
+ * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
+ * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
+ * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
+ * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * US Government Users Restricted Rights
+ * Use, duplication, or disclosure by the Government is subject to
+ * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
+ * (c)(1)(ii) of the Rights in Technical Data and Computer Software
+ * clause at DFARS 252.227-7013 and/or in similar or successor
+ * clauses in the FAR or the DOD or NASA FAR Supplement.
+ * Unpublished-- rights reserved under the copyright laws of the
+ * United States.  Contractor/manufacturer is Silicon Graphics,
+ * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
+ *
+ * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
+ */
+/*
+ *  pickdepth.c
+ *  Picking is demonstrated in this program.  In
+ *  rendering mode, three overlapping rectangles are
+ *  drawn.  When the left mouse button is pressed,
+ *  selection mode is entered with the picking matrix.
+ *  Rectangles which are drawn under the cursor position
+ *  are "picked."  Pay special attention to the depth
+ *  value range, which is returned.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <GL/glut.h>
+
+void
+myinit(void)
+{
+  glClearColor(0.0, 0.0, 0.0, 0.0);
+  glDepthFunc(GL_LESS);
+  glEnable(GL_DEPTH_TEST);
+  glShadeModel(GL_FLAT);
+  glDepthRange(0.0, 1.0);  /* The default z mapping */
+}
+
+/*  The three rectangles are drawn.  In selection mode,
+ *  each rectangle is given the same name.  Note that
+ *  each rectangle is drawn with a different z value.
+ */
+void
+drawRects(GLenum mode)
+{
+  if (mode == GL_SELECT)
+    glLoadName(1);
+  glBegin(GL_QUADS);
+  glColor3f(1.0, 1.0, 0.0);
+  glVertex3i(2, 0, 0);
+  glVertex3i(2, 6, 0);
+  glVertex3i(6, 6, 0);
+  glVertex3i(6, 0, 0);
+  glEnd();
+  if (mode == GL_SELECT)
+    glLoadName(2);
+  glBegin(GL_QUADS);
+  glColor3f(0.0, 1.0, 1.0);
+  glVertex3i(3, 2, -1);
+  glVertex3i(3, 8, -1);
+  glVertex3i(8, 8, -1);
+  glVertex3i(8, 2, -1);
+  glEnd();
+  if (mode == GL_SELECT)
+    glLoadName(3);
+  glBegin(GL_QUADS);
+  glColor3f(1.0, 0.0, 1.0);
+  glVertex3i(0, 2, -2);
+  glVertex3i(0, 7, -2);
+  glVertex3i(5, 7, -2);
+  glVertex3i(5, 2, -2);
+  glEnd();
+}
+
+/*  processHits() prints out the contents of the
+ *  selection array.
+ */
+void
+processHits(GLint hits, GLuint buffer[])
+{
+  GLint i;
+  GLuint j, names, *ptr;
+
+  printf("hits = %d\n", hits);
+  ptr = (GLuint *) buffer;
+  for (i = 0; i < hits; i++) {  /* for each hit  */
+    names = *ptr;
+    printf(" number of names for hit = %d\n", names);
+    ptr++;
+    printf("  z1 is %g;", (float) *ptr/0xffffffff);
+    ptr++;
+    printf(" z2 is %g\n", (float) *ptr/0xffffffff);
+    ptr++;
+    printf("   the name is ");
+    for (j = 0; j < names; j++) {  /* for each name */
+      printf("%d ", *ptr);
+      ptr++;
+    }
+    printf("\n");
+  }
+}
+
+/*  pickRects() sets up selection mode, name stack,
+ *  and projection matrix for picking.  Then the objects
+ *  are drawn.
+ */
+#define BUFSIZE 512
+
+void
+pickRects(int button, int state, int x, int y)
+{
+  GLuint selectBuf[BUFSIZE];
+  GLint hits;
+  GLint viewport[4];
+
+  if (button != GLUT_LEFT_BUTTON || state != GLUT_DOWN)
+    return;
+
+  glGetIntegerv(GL_VIEWPORT, viewport);
+
+  glSelectBuffer(BUFSIZE, selectBuf);
+  (void) glRenderMode(GL_SELECT);
+
+  glInitNames();
+  glPushName(-1);
+
+  glMatrixMode(GL_PROJECTION);
+  glPushMatrix();
+  glLoadIdentity();
+/*  create 5x5 pixel picking region near cursor location */
+  gluPickMatrix((GLdouble) x, (GLdouble) (viewport[3] - y),
+    5.0, 5.0, viewport);
+  glOrtho(0.0, 8.0, 0.0, 8.0, -0.5, 2.5);
+  drawRects(GL_SELECT);
+  glPopMatrix();
+  glFlush();
+
+  hits = glRenderMode(GL_RENDER);
+  processHits(hits, selectBuf);
+}
+
+void
+display(void)
+{
+  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+  drawRects(GL_RENDER);
+  glutSwapBuffers();
+}
+
+void
+myReshape(int w, int h)
+{
+  glViewport(0, 0, w, h);
+  glMatrixMode(GL_PROJECTION);
+  glLoadIdentity();
+  glOrtho(0.0, 8.0, 0.0, 8.0, -0.5, 2.5);
+  glMatrixMode(GL_MODELVIEW);
+  glLoadIdentity();
+}
+
+static void
+key(unsigned char k, int x, int y)
+{
+  switch (k) {
+  case 27:  /* Escape */
+    exit(0);
+    break;
+  default:
+    return;
+  }
+  glutPostRedisplay();
+}
+
+/*  Main Loop
+ *  Open window with initial window size, title bar,
+ *  RGBA display mode, depth buffer, and handle input events.
+ */
+int
+main(int argc, char **argv)
+{
+  glutInitWindowSize(200, 200);
+  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
+  glutInit(&argc, argv);
+  glutCreateWindow(argv[0]);
+  myinit();
+  glutMouseFunc(pickRects);
+  glutReshapeFunc(myReshape);
+  glutDisplayFunc(display);
+  glutKeyboardFunc(key);
+  glutMainLoop();
+  return 0;             /* ANSI C requires main to return int. */
+}