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/*
* PPM file output
* Brian Paul
* 8 Dec 2008
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include "glutint.h"
static void
write_ppm_file(const char *filename, const GLubyte *buffer,
int width, int height)
{
const int binary = 1;
FILE *f = fopen( filename, "w" );
if (f) {
const GLubyte *ptr = buffer;
int i, x, y;
if (binary) {
fprintf(f,"P6\n");
fprintf(f,"# ppm-file created by GLUT\n");
fprintf(f,"%i %i\n", width, height);
fprintf(f,"255\n");
fclose(f);
f = fopen( filename, "ab" ); /* reopen in binary append mode */
for (y = height - 1; y >= 0; y--) {
for (x = 0; x < width; x++) {
i = (y * width + x) * 4;
fputc(ptr[i], f); /* write red */
fputc(ptr[i+1], f); /* write green */
fputc(ptr[i+2], f); /* write blue */
}
}
}
else {
/*ASCII*/
int counter = 0;
fprintf(f,"P3\n");
fprintf(f,"# ascii ppm file created by GLUT\n");
fprintf(f,"%i %i\n", width, height);
fprintf(f,"255\n");
for (y = height - 1; y >= 0; y--) {
for (x = 0; x < width; x++) {
i = (y * width + x) * 4;
fprintf(f, " %3d %3d %3d", ptr[i], ptr[i+1], ptr[i+2]);
counter++;
if (counter % 5 == 0)
fprintf(f, "\n");
}
}
}
fclose(f);
}
}
/**
* Called from SwapBuffers if the GLUT_PPM_FILE env var is set.
*/
void __glutWritePPMFile(void)
{
int w = glutGet(GLUT_WINDOW_WIDTH);
int h = glutGet(GLUT_WINDOW_HEIGHT);
GLubyte *buf;
assert(__glutPPMFile);
buf = (GLubyte *) malloc(w * h * 4);
if (buf) {
/* XXX save/restore pixel packing */
glReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, buf);
write_ppm_file(__glutPPMFile, buf, w, h);
free(buf);
}
__glutPPMFile = NULL; /* only write one file */
}
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