Brian Paul
12219210af
Set GLUT_PPM_FILE to the desired filename. The first frame rendered will be written to that file.
81 lines
2.0 KiB
C
81 lines
2.0 KiB
C
/*
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* PPM file output
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* Brian Paul
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* 8 Dec 2008
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*/
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "glutint.h"
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static void
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write_ppm_file(const char *filename, const GLubyte *buffer,
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int width, int height)
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{
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const int binary = 1;
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FILE *f = fopen( filename, "w" );
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if (f) {
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const GLubyte *ptr = buffer;
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int i, x, y;
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if (binary) {
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fprintf(f,"P6\n");
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fprintf(f,"# ppm-file created by GLUT\n");
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fprintf(f,"%i %i\n", width, height);
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fprintf(f,"255\n");
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fclose(f);
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f = fopen( filename, "ab" ); /* reopen in binary append mode */
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for (y = height - 1; y >= 0; y--) {
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for (x = 0; x < width; x++) {
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i = (y * width + x) * 4;
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fputc(ptr[i], f); /* write red */
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fputc(ptr[i+1], f); /* write green */
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fputc(ptr[i+2], f); /* write blue */
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}
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}
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}
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else {
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/*ASCII*/
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int counter = 0;
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fprintf(f,"P3\n");
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fprintf(f,"# ascii ppm file created by GLUT\n");
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fprintf(f,"%i %i\n", width, height);
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fprintf(f,"255\n");
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for (y = height - 1; y >= 0; y--) {
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for (x = 0; x < width; x++) {
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i = (y * width + x) * 4;
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fprintf(f, " %3d %3d %3d", ptr[i], ptr[i+1], ptr[i+2]);
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counter++;
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if (counter % 5 == 0)
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fprintf(f, "\n");
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}
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}
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}
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fclose(f);
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}
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}
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/**
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* Called from SwapBuffers if the GLUT_PPM_FILE env var is set.
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*/
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void __glutWritePPMFile(void)
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{
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int w = glutGet(GLUT_WINDOW_WIDTH);
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int h = glutGet(GLUT_WINDOW_HEIGHT);
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GLubyte *buf;
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assert(__glutPPMFile);
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buf = (GLubyte *) malloc(w * h * 4);
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if (buf) {
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/* XXX save/restore pixel packing */
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glReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, buf);
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write_ppm_file(__glutPPMFile, buf, w, h);
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free(buf);
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}
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__glutPPMFile = NULL; /* only write one file */
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}
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