| /* |
| * 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 <string.h> |
| #include <math.h> |
| #include <GL/glut.h> |
| |
| |
| #define STEPCOUNT 40 |
| #define FALSE 0 |
| #define TRUE 1 |
| #define MAX(a, b) (((a) > (b)) ? (a) : (b)) |
| #define MIN(a, b) (((a) < (b)) ? (a) : (b)) |
| |
| |
| enum { |
| OP_NOOP = 0, |
| OP_STRETCH, |
| OP_DRAWPOINT, |
| OP_DRAWIMAGE |
| }; |
| |
| |
| typedef struct _cRec { |
| float x, y; |
| } cRec; |
| |
| typedef struct _vertexRec { |
| float x, y; |
| float dX, dY; |
| float tX, tY; |
| } vertexRec; |
| |
| |
| #include "loadppm.c" |
| |
| GLenum doubleBuffer; |
| int imageSizeX, imageSizeY; |
| char *fileName = 0; |
| PPMImage *image; |
| cRec cList[50]; |
| vertexRec vList[5]; |
| int cCount, cIndex[2], cStep; |
| GLenum op = OP_NOOP; |
| |
| |
| void DrawImage(void) |
| { |
| |
| glRasterPos2i(0, 0); |
| glDrawPixels(image->sizeX, image->sizeY, GL_RGB, GL_UNSIGNED_BYTE, |
| image->data); |
| |
| glFlush(); |
| if (doubleBuffer) { |
| glutSwapBuffers(); |
| } |
| |
| glRasterPos2i(0, 0); |
| glDrawPixels(image->sizeX, image->sizeY, GL_RGB, GL_UNSIGNED_BYTE, |
| image->data); |
| } |
| |
| void DrawPoint(void) |
| { |
| int i; |
| |
| glColor3f(1.0, 0.0, 1.0); |
| glPointSize(3.0); |
| glBegin(GL_POINTS); |
| for (i = 0; i < cCount; i++) { |
| glVertex2f(cList[i].x, cList[i].y); |
| } |
| glEnd(); |
| |
| glFlush(); |
| if (doubleBuffer) { |
| glutSwapBuffers(); |
| } |
| } |
| |
| void InitVList(void) |
| { |
| |
| vList[0].x = 0.0; |
| vList[0].y = 0.0; |
| vList[0].dX = 0.0; |
| vList[0].dY = 0.0; |
| vList[0].tX = 0.0; |
| vList[0].tY = 0.0; |
| |
| vList[1].x = (float)imageSizeX; |
| vList[1].y = 0.0; |
| vList[1].dX = 0.0; |
| vList[1].dY = 0.0; |
| vList[1].tX = 1.0; |
| vList[1].tY = 0.0; |
| |
| vList[2].x = (float)imageSizeX; |
| vList[2].y = (float)imageSizeY; |
| vList[2].dX = 0.0; |
| vList[2].dY = 0.0; |
| vList[2].tX = 1.0; |
| vList[2].tY = 1.0; |
| |
| vList[3].x = 0.0; |
| vList[3].y = (float)imageSizeY; |
| vList[3].dX = 0.0; |
| vList[3].dY = 0.0; |
| vList[3].tX = 0.0; |
| vList[3].tY = 1.0; |
| |
| vList[4].x = cList[0].x; |
| vList[4].y = cList[0].y; |
| vList[4].dX = (cList[1].x - cList[0].x) / STEPCOUNT; |
| vList[4].dY = (cList[1].y - cList[0].y) / STEPCOUNT; |
| vList[4].tX = cList[0].x / (float)imageSizeX; |
| vList[4].tY = cList[0].y / (float)imageSizeY; |
| } |
| |
| void ScaleImage(int sizeX, int sizeY) |
| { |
| GLubyte *buf; |
| |
| buf = (GLubyte *)malloc(3*sizeX*sizeY); |
| gluScaleImage(GL_RGB, image->sizeX, image->sizeY, GL_UNSIGNED_BYTE, |
| image->data, sizeX, sizeY, GL_UNSIGNED_BYTE, buf); |
| free(image->data); |
| image->data = buf; |
| image->sizeX = sizeX; |
| image->sizeY = sizeY; |
| } |
| |
| void SetPoint(int x, int y) |
| { |
| |
| cList[cCount].x = (float)x; |
| cList[cCount].y = (float)y; |
| cCount++; |
| } |
| |
| void Stretch(void) |
| { |
| |
| glBegin(GL_TRIANGLES); |
| glTexCoord2f(vList[0].tX, vList[0].tY); |
| glVertex2f(vList[0].x, vList[0].y); |
| glTexCoord2f(vList[1].tX, vList[1].tY); |
| glVertex2f(vList[1].x, vList[1].y); |
| glTexCoord2f(vList[4].tX, vList[4].tY); |
| glVertex2f(vList[4].x, vList[4].y); |
| glEnd(); |
| |
| glBegin(GL_TRIANGLES); |
| glTexCoord2f(vList[1].tX, vList[1].tY); |
| glVertex2f(vList[1].x, vList[1].y); |
| glTexCoord2f(vList[2].tX, vList[2].tY); |
| glVertex2f(vList[2].x, vList[2].y); |
| glTexCoord2f(vList[4].tX, vList[4].tY); |
| glVertex2f(vList[4].x, vList[4].y); |
| glEnd(); |
| |
| glBegin(GL_TRIANGLES); |
| glTexCoord2f(vList[2].tX, vList[2].tY); |
| glVertex2f(vList[2].x, vList[2].y); |
| glTexCoord2f(vList[3].tX, vList[3].tY); |
| glVertex2f(vList[3].x, vList[3].y); |
| glTexCoord2f(vList[4].tX, vList[4].tY); |
| glVertex2f(vList[4].x, vList[4].y); |
| glEnd(); |
| |
| glBegin(GL_TRIANGLES); |
| glTexCoord2f(vList[3].tX, vList[3].tY); |
| glVertex2f(vList[3].x, vList[3].y); |
| glTexCoord2f(vList[0].tX, vList[0].tY); |
| glVertex2f(vList[0].x, vList[0].y); |
| glTexCoord2f(vList[4].tX, vList[4].tY); |
| glVertex2f(vList[4].x, vList[4].y); |
| glEnd(); |
| |
| glFlush(); |
| if (doubleBuffer) { |
| glutSwapBuffers(); |
| } |
| |
| if (++cStep < STEPCOUNT) { |
| vList[4].x += vList[4].dX; |
| vList[4].y += vList[4].dY; |
| } else { |
| cIndex[0] = cIndex[1]; |
| cIndex[1] = cIndex[1] + 1; |
| if (cIndex[1] == cCount) { |
| cIndex[1] = 0; |
| } |
| vList[4].dX = (cList[cIndex[1]].x - cList[cIndex[0]].x) / STEPCOUNT; |
| vList[4].dY = (cList[cIndex[1]].y - cList[cIndex[0]].y) / STEPCOUNT; |
| cStep = 0; |
| } |
| } |
| |
| void Key(unsigned char key, int x, int y) |
| { |
| |
| switch (key) { |
| case 27: |
| free(image->data); |
| exit(1); |
| case 32: |
| if (cCount > 1) { |
| InitVList(); |
| cIndex[0] = 0; |
| cIndex[1] = 1; |
| cStep = 0; |
| glEnable(GL_TEXTURE_2D); |
| op = OP_STRETCH; |
| } |
| break; |
| default: |
| return; |
| } |
| |
| glutPostRedisplay(); |
| } |
| |
| void Mouse(int button, int state, int mouseX, int mouseY) |
| { |
| |
| if (state != GLUT_DOWN) |
| return; |
| |
| if (op == OP_STRETCH) { |
| glDisable(GL_TEXTURE_2D); |
| cCount = 0; |
| op = OP_DRAWIMAGE; |
| } else { |
| SetPoint(mouseX, imageSizeY-mouseY); |
| op = OP_DRAWPOINT; |
| } |
| |
| glutPostRedisplay(); |
| } |
| |
| void Animate(void) |
| { |
| static double t0 = -1.; |
| double t, dt; |
| t = glutGet(GLUT_ELAPSED_TIME) / 1000.; |
| if (t0 < 0.) |
| t0 = t; |
| dt = t - t0; |
| |
| if (dt < 1./60.) |
| return; |
| |
| t0 = t; |
| |
| switch (op) { |
| case OP_STRETCH: |
| Stretch(); |
| break; |
| case OP_DRAWPOINT: |
| DrawPoint(); |
| break; |
| case OP_DRAWIMAGE: |
| DrawImage(); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| static GLenum Args(int argc, char **argv) |
| { |
| GLint i; |
| |
| doubleBuffer = GL_TRUE; |
| |
| for (i = 1; i < argc; i++) { |
| if (strcmp(argv[i], "-sb") == 0) { |
| doubleBuffer = GL_FALSE; |
| } else if (strcmp(argv[i], "-db") == 0) { |
| doubleBuffer = GL_TRUE; |
| } else if (strcmp(argv[i], "-f") == 0) { |
| if (i+1 >= argc || argv[i+1][0] == '-') { |
| printf("-f (No file name).\n"); |
| return GL_FALSE; |
| } else { |
| fileName = argv[++i]; |
| } |
| } else { |
| printf("%s (Bad option).\n", argv[i]); |
| return GL_FALSE; |
| } |
| } |
| return GL_TRUE; |
| } |
| |
| #if !defined(GLUTCALLBACK) |
| #define GLUTCALLBACK |
| #endif |
| |
| void GLUTCALLBACK glut_post_redisplay_p(void) |
| { |
| glutPostRedisplay(); |
| } |
| |
| int main(int argc, char **argv) |
| { |
| GLenum type; |
| |
| glutInit(&argc, argv); |
| |
| if (Args(argc, argv) == GL_FALSE) { |
| exit(1); |
| } |
| |
| if (fileName == 0) { |
| printf("No image file.\n"); |
| exit(1); |
| } |
| |
| image = LoadPPM(fileName); |
| |
| /* changed powf and logf to pow and log -Brian */ |
| imageSizeX = (int)pow(2.0, (float)((int)(log(image->sizeX)/log(2.0)))); |
| imageSizeY = (int)pow(2.0, (float)((int)(log(image->sizeY)/log(2.0)))); |
| |
| glutInitWindowPosition(0, 0); glutInitWindowSize( imageSizeX, imageSizeY); |
| |
| type = GLUT_RGB; |
| type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE; |
| glutInitDisplayMode(type); |
| |
| if (glutCreateWindow("Stretch") == GL_FALSE) { |
| exit(1); |
| } |
| |
| glViewport(0, 0, imageSizeX, imageSizeY); |
| gluOrtho2D(0, imageSizeX, 0, imageSizeY); |
| glClearColor(0.0, 0.0, 0.0, 0.0); |
| |
| glPixelStorei(GL_UNPACK_ALIGNMENT, 1); |
| glPixelStorei(GL_PACK_ALIGNMENT, 1); |
| |
| ScaleImage(imageSizeX, imageSizeY); |
| |
| glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
| glTexImage2D(GL_TEXTURE_2D, 0, 3, image->sizeX, image->sizeY, 0, |
| GL_RGB, GL_UNSIGNED_BYTE, (unsigned char *)image->data); |
| |
| cCount = 0; |
| cIndex[0] = 0; |
| cIndex[1] = 0; |
| cStep = 0; |
| op = OP_DRAWIMAGE; |
| |
| glutKeyboardFunc(Key); |
| glutMouseFunc(Mouse); |
| glutDisplayFunc(Animate); |
| glutIdleFunc(glut_post_redisplay_p); |
| glutMainLoop(); |
| return 0; |
| } |