/* Capture function --------------------------------------------------------- */

#include "capture.h"
#include "ppm.h"

#include <stdio.h>

#ifdef __APPLE__
#include <GLUT/glut.h>
#else
#include <GL/glut.h>
#endif

int
capture(const char *prefix, size_t width, size_t height)
{
    static GLubyte *buffer = NULL;
    static size_t buffer_size = 0;
    static int frame_count = 0;

    char fname[1024];

    if (buffer_size < width*height*3) {
    	buffer_size = width*height*3;
    	if (buffer)
    	    free(buffer);
	buffer = (GLubyte*)malloc(sizeof(GLubyte)*buffer_size);
    }

    glReadBuffer(GL_BACK);
    glReadPixels(0, 0, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer);
    
    sprintf(fname, "%s.%08d.ppm", prefix, frame_count++);

    return ppm_write(fname, buffer, width, height);
}

/* vim: set sts=4 sw=4 ts=8 ft=cpp: ----------------------------------------- */