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- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <fcntl.h>
- #include <unistd.h>
- #include <math.h>
- #include "tk.h"
-
- #if defined(__MWERKS__) || defined(__SC__)
- #include <console.h> /* ccommand */
- #endif
-
-
- #define STEPCOUNT 40
- #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 _c_rec {
- float x, y;
- } c_rec;
-
- typedef struct _vertexRec {
- float x, y;
- float dX, dY;
- float tX, tY;
- } vertexRec;
-
-
- GLenum doubleBuffer, directRender;
- int imageSizeX, imageSizeY;
- char *fileName = 0;
- TK_RGBImageRec *image;
- c_rec c_list[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) {
- tkSwapBuffers();
- }
-
- 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(c_list[i].x, c_list[i].y);
- }
- glEnd();
-
- glFlush();
- if (doubleBuffer) {
- tkSwapBuffers();
- }
- }
-
- 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 = c_list[0].x;
- vList[4].y = c_list[0].y;
- vList[4].dX = (c_list[1].x - c_list[0].x) / STEPCOUNT;
- vList[4].dY = (c_list[1].y - c_list[0].y) / STEPCOUNT;
- vList[4].tX = c_list[0].x / (float)imageSizeX;
- vList[4].tY = c_list[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)
- {
-
- c_list[cCount].x = (float)x;
- c_list[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) {
- tkSwapBuffers();
- }
-
- 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 = (c_list[cIndex[1]].x - c_list[cIndex[0]].x) / STEPCOUNT;
- vList[4].dY = (c_list[cIndex[1]].y - c_list[cIndex[0]].y) / STEPCOUNT;
- cStep = 0;
- }
- }
-
- GLenum Key(int key, GLenum mask)
- {
-
- switch (key) {
- case TK_ESCAPE:
- free(image->data);
- tkQuit();
- case TK_SPACE:
- if (cCount > 1) {
- InitVList();
- cIndex[0] = 0;
- cIndex[1] = 1;
- cStep = 0;
- glEnable(GL_TEXTURE_2D);
- op = OP_STRETCH;
- }
- break;
- default:
- return GL_FALSE;
- }
- return GL_TRUE;
- }
-
- GLenum Mouse(int mouseX, int mouseY, GLenum button)
- {
-
- if (op == OP_STRETCH) {
- glDisable(GL_TEXTURE_2D);
- cCount = 0;
- op = OP_DRAWIMAGE;
- } else {
- SetPoint(mouseX, imageSizeY-mouseY);
- op = OP_DRAWPOINT;
- }
- return GL_TRUE;
- }
-
- void Animate(void)
- {
-
- switch (op) {
- case OP_STRETCH:
- Stretch();
- break;
- case OP_DRAWPOINT:
- DrawPoint();
- break;
- case OP_DRAWIMAGE:
- DrawImage();
- break;
- }
- }
-
- static GLenum Args(int argc, char **argv)
- {
- GLint i;
-
- doubleBuffer = GL_FALSE;
- directRender = 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], "-dr") == 0) {
- directRender = GL_TRUE;
- } else if (strcmp(argv[i], "-ir") == 0) {
- directRender = GL_FALSE;
- } 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;
- }
-
- void main(int argc, char **argv)
- {
- GLenum type;
-
- #if defined(__MWERKS__) || defined(__SC__)
- argc = ccommand(&argv);
- #endif
-
- if (Args(argc, argv) == GL_FALSE) {
- tkQuit();
- }
-
- if (fileName == 0) {
- printf("No image file.\n");
- tkQuit();
- }
-
- image = tkRGBImageLoad(fileName);
-
- imageSizeX = (int)powf(2.0, (float)((int)(logf(image->sizeX)/logf(2.0))));
- imageSizeY = (int)powf(2.0, (float)((int)(logf(image->sizeY)/logf(2.0))));
-
- tkInitPosition(30, 60, imageSizeX, imageSizeY);
-
- type = TK_RGB;
- type |= (doubleBuffer) ? TK_DOUBLE : TK_SINGLE;
- type |= (directRender) ? TK_DIRECT : TK_INDIRECT;
- tkInitDisplayMode(type);
-
- if (tkInitWindow("Stretch") == GL_FALSE) {
- tkQuit();
- }
-
- 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;
-
- tkKeyDownFunc(Key);
- tkMouseDownFunc(Mouse);
- tkIdleFunc(Animate);
- tkExec();
- }
-