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Amiga Magazin: Amiga-CD 2000 April & May
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mesa3.1
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select.c
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C/C++ Source or Header
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2000-01-01
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9KB
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457 lines
/*
* 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;
}