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jtg
375
progs/samples/stretch.c
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375
progs/samples/stretch.c
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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 <string.h>
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#include <math.h>
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#include <GL/glut.h>
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#define STEPCOUNT 40
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#define FALSE 0
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#define TRUE 1
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#define MAX(a, b) (((a) > (b)) ? (a) : (b))
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#define MIN(a, b) (((a) < (b)) ? (a) : (b))
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enum {
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OP_NOOP = 0,
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OP_STRETCH,
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OP_DRAWPOINT,
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OP_DRAWIMAGE
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};
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typedef struct _cRec {
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float x, y;
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} cRec;
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typedef struct _vertexRec {
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float x, y;
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float dX, dY;
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float tX, tY;
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} vertexRec;
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#include "loadppm.c"
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GLenum doubleBuffer;
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int imageSizeX, imageSizeY;
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char *fileName = 0;
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PPMImage *image;
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cRec cList[50];
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vertexRec vList[5];
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int cCount, cIndex[2], cStep;
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GLenum op = OP_NOOP;
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void DrawImage(void)
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{
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glRasterPos2i(0, 0);
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glDrawPixels(image->sizeX, image->sizeY, GL_RGB, GL_UNSIGNED_BYTE,
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image->data);
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glFlush();
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if (doubleBuffer) {
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glutSwapBuffers();
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}
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glRasterPos2i(0, 0);
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glDrawPixels(image->sizeX, image->sizeY, GL_RGB, GL_UNSIGNED_BYTE,
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image->data);
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}
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void DrawPoint(void)
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{
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int i;
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glColor3f(1.0, 0.0, 1.0);
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glPointSize(3.0);
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glBegin(GL_POINTS);
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for (i = 0; i < cCount; i++) {
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glVertex2f(cList[i].x, cList[i].y);
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}
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glEnd();
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glFlush();
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if (doubleBuffer) {
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glutSwapBuffers();
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}
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}
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void InitVList(void)
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{
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vList[0].x = 0.0;
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vList[0].y = 0.0;
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vList[0].dX = 0.0;
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vList[0].dY = 0.0;
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vList[0].tX = 0.0;
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vList[0].tY = 0.0;
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vList[1].x = (float)imageSizeX;
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vList[1].y = 0.0;
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vList[1].dX = 0.0;
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vList[1].dY = 0.0;
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vList[1].tX = 1.0;
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vList[1].tY = 0.0;
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vList[2].x = (float)imageSizeX;
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vList[2].y = (float)imageSizeY;
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vList[2].dX = 0.0;
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vList[2].dY = 0.0;
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vList[2].tX = 1.0;
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vList[2].tY = 1.0;
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vList[3].x = 0.0;
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vList[3].y = (float)imageSizeY;
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vList[3].dX = 0.0;
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vList[3].dY = 0.0;
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vList[3].tX = 0.0;
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vList[3].tY = 1.0;
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vList[4].x = cList[0].x;
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vList[4].y = cList[0].y;
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vList[4].dX = (cList[1].x - cList[0].x) / STEPCOUNT;
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vList[4].dY = (cList[1].y - cList[0].y) / STEPCOUNT;
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vList[4].tX = cList[0].x / (float)imageSizeX;
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vList[4].tY = cList[0].y / (float)imageSizeY;
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}
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void ScaleImage(int sizeX, int sizeY)
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{
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GLubyte *buf;
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buf = (GLubyte *)malloc(3*sizeX*sizeY);
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gluScaleImage(GL_RGB, image->sizeX, image->sizeY, GL_UNSIGNED_BYTE,
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image->data, sizeX, sizeY, GL_UNSIGNED_BYTE, buf);
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free(image->data);
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image->data = buf;
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image->sizeX = sizeX;
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image->sizeY = sizeY;
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}
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void SetPoint(int x, int y)
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{
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cList[cCount].x = (float)x;
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cList[cCount].y = (float)y;
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cCount++;
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}
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void Stretch(void)
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{
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glBegin(GL_TRIANGLES);
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glTexCoord2f(vList[0].tX, vList[0].tY);
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glVertex2f(vList[0].x, vList[0].y);
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glTexCoord2f(vList[1].tX, vList[1].tY);
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glVertex2f(vList[1].x, vList[1].y);
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glTexCoord2f(vList[4].tX, vList[4].tY);
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glVertex2f(vList[4].x, vList[4].y);
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glEnd();
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glBegin(GL_TRIANGLES);
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glTexCoord2f(vList[1].tX, vList[1].tY);
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glVertex2f(vList[1].x, vList[1].y);
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glTexCoord2f(vList[2].tX, vList[2].tY);
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glVertex2f(vList[2].x, vList[2].y);
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glTexCoord2f(vList[4].tX, vList[4].tY);
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glVertex2f(vList[4].x, vList[4].y);
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glEnd();
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glBegin(GL_TRIANGLES);
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glTexCoord2f(vList[2].tX, vList[2].tY);
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glVertex2f(vList[2].x, vList[2].y);
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glTexCoord2f(vList[3].tX, vList[3].tY);
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glVertex2f(vList[3].x, vList[3].y);
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glTexCoord2f(vList[4].tX, vList[4].tY);
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glVertex2f(vList[4].x, vList[4].y);
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glEnd();
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glBegin(GL_TRIANGLES);
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glTexCoord2f(vList[3].tX, vList[3].tY);
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glVertex2f(vList[3].x, vList[3].y);
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glTexCoord2f(vList[0].tX, vList[0].tY);
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glVertex2f(vList[0].x, vList[0].y);
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glTexCoord2f(vList[4].tX, vList[4].tY);
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glVertex2f(vList[4].x, vList[4].y);
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glEnd();
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glFlush();
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if (doubleBuffer) {
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glutSwapBuffers();
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}
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if (++cStep < STEPCOUNT) {
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vList[4].x += vList[4].dX;
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vList[4].y += vList[4].dY;
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} else {
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cIndex[0] = cIndex[1];
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cIndex[1] = cIndex[1] + 1;
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if (cIndex[1] == cCount) {
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cIndex[1] = 0;
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}
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vList[4].dX = (cList[cIndex[1]].x - cList[cIndex[0]].x) / STEPCOUNT;
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vList[4].dY = (cList[cIndex[1]].y - cList[cIndex[0]].y) / STEPCOUNT;
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cStep = 0;
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}
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}
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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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free(image->data);
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exit(1);
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case 32:
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if (cCount > 1) {
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InitVList();
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cIndex[0] = 0;
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cIndex[1] = 1;
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cStep = 0;
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glEnable(GL_TEXTURE_2D);
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op = OP_STRETCH;
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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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void Mouse(int button, int state, int mouseX, int mouseY)
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{
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if (state != GLUT_DOWN)
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return;
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if (op == OP_STRETCH) {
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glDisable(GL_TEXTURE_2D);
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cCount = 0;
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op = OP_DRAWIMAGE;
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} else {
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SetPoint(mouseX, imageSizeY-mouseY);
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op = OP_DRAWPOINT;
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}
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glutPostRedisplay();
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}
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void Animate(void)
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{
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switch (op) {
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case OP_STRETCH:
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Stretch();
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break;
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case OP_DRAWPOINT:
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DrawPoint();
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break;
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case OP_DRAWIMAGE:
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DrawImage();
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break;
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default:
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break;
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}
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}
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static GLenum Args(int argc, char **argv)
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{
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GLint i;
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doubleBuffer = GL_FALSE;
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for (i = 1; i < argc; i++) {
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if (strcmp(argv[i], "-sb") == 0) {
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doubleBuffer = GL_FALSE;
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} else if (strcmp(argv[i], "-db") == 0) {
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doubleBuffer = GL_TRUE;
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} else if (strcmp(argv[i], "-f") == 0) {
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if (i+1 >= argc || argv[i+1][0] == '-') {
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printf("-f (No file name).\n");
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return GL_FALSE;
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} else {
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fileName = argv[++i];
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}
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} else {
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printf("%s (Bad option).\n", argv[i]);
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return GL_FALSE;
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}
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}
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return GL_TRUE;
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}
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void GLUTCALLBACK glut_post_redisplay_p(void)
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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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if (Args(argc, argv) == GL_FALSE) {
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exit(1);
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}
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if (fileName == 0) {
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printf("No image file.\n");
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exit(1);
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}
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image = LoadPPM(fileName);
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/* changed powf and logf to pow and log -Brian */
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imageSizeX = (int)pow(2.0, (float)((int)(log(image->sizeX)/log(2.0))));
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imageSizeY = (int)pow(2.0, (float)((int)(log(image->sizeY)/log(2.0))));
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glutInitWindowPosition(0, 0); glutInitWindowSize( imageSizeX, imageSizeY);
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type = GLUT_RGB;
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type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
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glutInitDisplayMode(type);
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if (glutCreateWindow("Stretch") == GL_FALSE) {
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exit(1);
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}
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glViewport(0, 0, imageSizeX, imageSizeY);
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gluOrtho2D(0, imageSizeX, 0, imageSizeY);
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glClearColor(0.0, 0.0, 0.0, 0.0);
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glPixelStorei(GL_PACK_ALIGNMENT, 1);
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ScaleImage(imageSizeX, imageSizeY);
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glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexImage2D(GL_TEXTURE_2D, 0, 3, image->sizeX, image->sizeY, 0,
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GL_RGB, GL_UNSIGNED_BYTE, (unsigned char *)image->data);
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cCount = 0;
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cIndex[0] = 0;
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cIndex[1] = 0;
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cStep = 0;
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op = OP_DRAWIMAGE;
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glutKeyboardFunc(Key);
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glutMouseFunc(Mouse);
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glutDisplayFunc(Animate);
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glutIdleFunc(glut_post_redisplay_p);
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glutMainLoop();
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return 0;
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}
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