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Amiga Format CD 52
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Amiga Format AFCD52 (Issue 136, May 2000).iso
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mesa
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mesa-tk
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samples.tk
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select.c
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C/C++ Source or Header
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2000-02-23
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9KB
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469 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 "gltk.h"
#define MAXOBJS 10000
#define MAXSELECT 100
#define MAXFEED 300
#define SOLID 1
#define LINE 2
#define POINT 3
GLenum directRender;
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 GLenum Mouse(int mouseX, int mouseY, GLenum button)
{
GLint hit;
hit = DoSelect((GLint) mouseX, (GLint) mouseY);
if (hit != -1) {
if (button & TK_LEFTBUTTON) {
RecolorTri(hit);
}
if (button & TK_MIDDLEBUTTON) {
GrowTri(hit);
}
if (button & TK_RIGHTBUTTON) {
DeleteTri(hit);
}
return GL_TRUE;
}
return GL_FALSE;
}
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 GLenum Key(int key, GLenum mask)
{
int mouseX, mouseY;
switch (key) {
case TK_ESCAPE:
tkQuit();
case TK_LEFT:
zRotation += 0.5;
break;
case TK_RIGHT:
zRotation -= 0.5;
break;
case TK_Z:
zoom /= 0.75;
break;
case TK_z:
zoom *= 0.75;
break;
case TK_f:
DoFeedback();
break;
case TK_d:
tkGetMouseLoc(&mouseX, &mouseY);
DrawZoom((GLint) mouseX, (GLint) mouseY);
break;
case TK_l:
linePoly = !linePoly;
if (linePoly) {
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
}
else {
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
}
break;
default:
return GL_FALSE;
}
return GL_TRUE;
}
static GLenum Args(int argc, char **argv)
{
GLint i;
directRender = GL_TRUE;
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "-dr") == 0) {
directRender = GL_TRUE;
}
else if (strcmp(argv[i], "-ir") == 0) {
directRender = GL_FALSE;
}
else {
printf("%s (Bad option).\n", argv[i]);
return GL_FALSE;
}
}
return GL_TRUE;
}
void main(int argc, char **argv)
{
GLenum type;
if (Args(argc, argv) == GL_FALSE) {
tkQuit();
}
windW = 300;
windH = 300;
tkInitPosition(0, 0, windW, windH);
type = TK_RGB | TK_SINGLE;
type |= (directRender) ? TK_DIRECT : TK_INDIRECT;
tkInitDisplayMode(type);
if (tkInitWindow("Select Test") == GL_FALSE) {
tkQuit();
}
Init();
tkExposeFunc(Reshape);
tkReshapeFunc(Reshape);
tkKeyDownFunc(Key);
tkMouseDownFunc(Mouse);
tkDisplayFunc(Draw);
tkExec();
}