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