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xenocara/dist/Mesa/progs/samples/stretch.c
matthieu 8c9bfd57b8 Import MesaDemos 6.5.1
2006-11-25 18:56:37 +00:00

391 lines
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C
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/*
* 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;
}
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