Initial revision
diff --git a/progs/samples/select.c b/progs/samples/select.c
new file mode 100644
index 0000000..5a73a45
--- /dev/null
+++ b/progs/samples/select.c
@@ -0,0 +1,456 @@
+/*
+ * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that (i) the above copyright notices and this permission notice appear in
+ * all copies of the software and related documentation, and (ii) the name of
+ * Silicon Graphics may not be used in any advertising or
+ * publicity relating to the software without the specific, prior written
+ * permission of Silicon Graphics.
+ *
+ * THE SOFTWARE IS PROVIDED "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 BE LIABLE FOR
+ * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
+ * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+ * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
+ * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <string.h>
+#include <time.h>
+#include <GL/glut.h>
+
+
+#define MAXOBJS 10000
+#define MAXSELECT 100
+#define MAXFEED 300
+#define SOLID 1
+#define LINE 2
+#define POINT 3
+
+
+GLint windW, windH;
+
+GLuint selectBuf[MAXSELECT];
+GLfloat feedBuf[MAXFEED];
+GLint vp[4];
+float zRotation = 90.0;
+float zoom = 1.0;
+GLint objectCount;
+GLint numObjects;
+struct object {
+ float v1[2];
+ float v2[2];
+ float v3[2];
+ float color[3];
+} objects[MAXOBJS];
+GLenum linePoly = GL_FALSE;
+
+
+static void InitObjects(GLint num)
+{
+ GLint i;
+ float x, y;
+
+ if (num > MAXOBJS) {
+ num = MAXOBJS;
+ }
+ if (num < 1) {
+ num = 1;
+ }
+ objectCount = num;
+
+ srand((unsigned int)time(NULL));
+ for (i = 0; i < num; i++) {
+ x = (rand() % 300) - 150;
+ y = (rand() % 300) - 150;
+
+ objects[i].v1[0] = x + (rand() % 50) - 25;
+ objects[i].v2[0] = x + (rand() % 50) - 25;
+ objects[i].v3[0] = x + (rand() % 50) - 25;
+ objects[i].v1[1] = y + (rand() % 50) - 25;
+ objects[i].v2[1] = y + (rand() % 50) - 25;
+ objects[i].v3[1] = y + (rand() % 50) - 25;
+ objects[i].color[0] = ((rand() % 100) + 50) / 150.0;
+ objects[i].color[1] = ((rand() % 100) + 50) / 150.0;
+ objects[i].color[2] = ((rand() % 100) + 50) / 150.0;
+ }
+}
+
+static void Init(void)
+{
+
+ numObjects = 10;
+ InitObjects(numObjects);
+ glGetIntegerv(GL_VIEWPORT, vp);
+}
+
+static void Reshape(int width, int height)
+{
+
+ windW = (GLint)width;
+ windH = (GLint)height;
+}
+
+static void Render(GLenum mode)
+{
+ GLint i;
+
+ for (i = 0; i < objectCount; i++) {
+ if (mode == GL_SELECT) {
+ glLoadName(i);
+ }
+ glColor3fv(objects[i].color);
+ glBegin(GL_POLYGON);
+ glVertex2fv(objects[i].v1);
+ glVertex2fv(objects[i].v2);
+ glVertex2fv(objects[i].v3);
+ glEnd();
+ }
+}
+
+static GLint DoSelect(GLint x, GLint y)
+{
+ GLint hits;
+
+ glSelectBuffer(MAXSELECT, selectBuf);
+ (void)glRenderMode(GL_SELECT);
+ glInitNames();
+ glPushName(~0);
+
+ glPushMatrix();
+
+ glViewport(0, 0, windW, windH);
+ glGetIntegerv(GL_VIEWPORT, vp);
+
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ gluPickMatrix(x, windH-y, 4, 4, vp);
+ gluOrtho2D(-175, 175, -175, 175);
+ glMatrixMode(GL_MODELVIEW);
+
+ glClearColor(0.0, 0.0, 0.0, 0.0);
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ glScalef(zoom, zoom, zoom);
+ glRotatef(zRotation, 0, 0, 1);
+
+ Render(GL_SELECT);
+
+ glPopMatrix();
+
+ hits = glRenderMode(GL_RENDER);
+ if (hits <= 0) {
+ return -1;
+ }
+
+ return selectBuf[(hits-1)*4+3];
+}
+
+static void RecolorTri(GLint h)
+{
+
+ objects[h].color[0] = ((rand() % 100) + 50) / 150.0;
+ objects[h].color[1] = ((rand() % 100) + 50) / 150.0;
+ objects[h].color[2] = ((rand() % 100) + 50) / 150.0;
+}
+
+static void DeleteTri(GLint h)
+{
+
+ objects[h] = objects[objectCount-1];
+ objectCount--;
+}
+
+static void GrowTri(GLint h)
+{
+ float v[2];
+ float *oldV;
+ GLint i;
+
+ v[0] = objects[h].v1[0] + objects[h].v2[0] + objects[h].v3[0];
+ v[1] = objects[h].v1[1] + objects[h].v2[1] + objects[h].v3[1];
+ v[0] /= 3;
+ v[1] /= 3;
+
+ for (i = 0; i < 3; i++) {
+ switch (i) {
+ case 0:
+ oldV = objects[h].v1;
+ break;
+ case 1:
+ oldV = objects[h].v2;
+ break;
+ case 2:
+ oldV = objects[h].v3;
+ break;
+ }
+ oldV[0] = 1.5 * (oldV[0] - v[0]) + v[0];
+ oldV[1] = 1.5 * (oldV[1] - v[1]) + v[1];
+ }
+}
+
+static void Mouse(int button, int state, int mouseX, int mouseY)
+{
+ GLint hit;
+
+ if (state != GLUT_DOWN)
+ return;
+
+ hit = DoSelect((GLint)mouseX, (GLint)mouseY);
+ if (hit != -1) {
+ if (button == GLUT_LEFT_BUTTON) {
+ RecolorTri(hit);
+ }
+ if (button == GLUT_MIDDLE_BUTTON) {
+ GrowTri(hit);
+ }
+ if (button == GLUT_RIGHT_BUTTON) {
+ DeleteTri(hit);
+ }
+ }
+
+ glutPostRedisplay();
+}
+
+static void Draw(void)
+{
+
+ glPushMatrix();
+
+ glViewport(0, 0, windW, windH);
+ glGetIntegerv(GL_VIEWPORT, vp);
+
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ gluOrtho2D(-175, 175, -175, 175);
+ glMatrixMode(GL_MODELVIEW);
+
+ glClearColor(0.0, 0.0, 0.0, 0.0);
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ glScalef(zoom, zoom, zoom);
+ glRotatef(zRotation, 0, 0, 1);
+
+ Render(GL_RENDER);
+
+ glPopMatrix();
+
+ glFlush();
+}
+
+static void DrawZoom(GLint x, GLint y)
+{
+
+ glPushMatrix();
+
+ glViewport(0, 0, windW, windH);
+ glGetIntegerv(GL_VIEWPORT, vp);
+
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ gluPickMatrix(x, windH-y, 4, 4, vp);
+ gluOrtho2D(-175, 175, -175, 175);
+ glMatrixMode(GL_MODELVIEW);
+
+ glClearColor(0.0, 0.0, 0.0, 0.0);
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ glScalef(zoom, zoom, zoom);
+ glRotatef(zRotation, 0, 0, 1);
+
+ Render(GL_RENDER);
+
+ glPopMatrix();
+}
+
+static void DumpFeedbackVert(GLint *i, GLint n)
+{
+ GLint index;
+
+ index = *i;
+ if (index+7 > n) {
+ *i = n;
+ printf(" ???\n");
+ return;
+ }
+ printf(" (%g %g %g), color = (%4.2f %4.2f %4.2f)\n",
+ feedBuf[index],
+ feedBuf[index+1],
+ feedBuf[index+2],
+ feedBuf[index+3],
+ feedBuf[index+4],
+ feedBuf[index+5]);
+ index += 7;
+ *i = index;
+}
+
+static void DrawFeedback(GLint n)
+{
+ GLint i;
+ GLint verts;
+
+ printf("Feedback results (%d floats):\n", n);
+ for (i = 0; i < n; i++) {
+ switch ((GLint)feedBuf[i]) {
+ case GL_POLYGON_TOKEN:
+ printf("Polygon");
+ i++;
+ if (i < n) {
+ verts = (GLint)feedBuf[i];
+ i++;
+ printf(": %d vertices", verts);
+ } else {
+ verts = 0;
+ }
+ printf("\n");
+ while (verts) {
+ DumpFeedbackVert(&i, n);
+ verts--;
+ }
+ i--;
+ break;
+ case GL_LINE_TOKEN:
+ printf("Line:\n");
+ i++;
+ DumpFeedbackVert(&i, n);
+ DumpFeedbackVert(&i, n);
+ i--;
+ break;
+ case GL_LINE_RESET_TOKEN:
+ printf("Line Reset:\n");
+ i++;
+ DumpFeedbackVert(&i, n);
+ DumpFeedbackVert(&i, n);
+ i--;
+ break;
+ default:
+ printf("%9.2f\n", feedBuf[i]);
+ break;
+ }
+ }
+ if (i == MAXFEED) {
+ printf("...\n");
+ }
+ printf("\n");
+}
+
+static void DoFeedback(void)
+{
+ GLint x;
+
+ glFeedbackBuffer(MAXFEED, GL_3D_COLOR, feedBuf);
+ (void)glRenderMode(GL_FEEDBACK);
+
+ glPushMatrix();
+
+ glViewport(0, 0, windW, windH);
+ glGetIntegerv(GL_VIEWPORT, vp);
+
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ gluOrtho2D(-175, 175, -175, 175);
+ glMatrixMode(GL_MODELVIEW);
+
+ glClearColor(0.0, 0.0, 0.0, 0.0);
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ glScalef(zoom, zoom, zoom);
+ glRotatef(zRotation, 0, 0, 1);
+
+ Render(GL_FEEDBACK);
+
+ glPopMatrix();
+
+ x = glRenderMode(GL_RENDER);
+ if (x == -1) {
+ x = MAXFEED;
+ }
+
+ DrawFeedback((GLint)x);
+}
+
+static void Key2(int key, int x, int y)
+{
+ switch (key) {
+ case GLUT_KEY_LEFT:
+ zRotation += 0.5;
+ break;
+ case GLUT_KEY_RIGHT:
+ zRotation -= 0.5;
+ break;
+ default:
+ return;
+ }
+
+ glutPostRedisplay();
+}
+
+static void Key(unsigned char key, int x, int y)
+{
+ switch (key) {
+ case 27:
+ exit(1);
+ case 'Z':
+ zoom /= 0.75;
+ break;
+ case 'z':
+ zoom *= 0.75;
+ break;
+ case 'f':
+ DoFeedback();
+ break;
+ case 'd':
+ DrawZoom(x, y);
+ break;
+ case 'l':
+ linePoly = !linePoly;
+ if (linePoly) {
+ glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+ } else {
+ glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+ }
+ break;
+ default:
+ return;
+ }
+
+ glutPostRedisplay();
+}
+
+int main(int argc, char **argv)
+{
+ GLenum type;
+
+ glutInit(&argc, argv);
+
+ windW = 300;
+ windH = 300;
+ glutInitWindowPosition(0, 0); glutInitWindowSize( windW, windH);
+
+ type = GLUT_RGB | GLUT_SINGLE;
+ glutInitDisplayMode(type);
+
+ if (glutCreateWindow("Select Test") == GL_FALSE) {
+ exit(1);
+ }
+
+ Init();
+
+ glutReshapeFunc(Reshape);
+ glutKeyboardFunc(Key);
+ glutSpecialFunc(Key2);
+ glutMouseFunc(Mouse);
+ glutDisplayFunc(Draw);
+ glutMainLoop();
+ return 0;
+}