texstretch/main.c

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>

typedef uint8_t u8;

#define CDEPTH 255

#define log(fmt, ...) fprintf(stderr, fmt "\n", ##__VA_ARGS__)
#define panic(fmt, ...) { fprintf(stderr, "PANIC: " fmt "\n", ##__VA_ARGS__); exit(EXIT_FAILURE); }

// fb is framebuffer. Thsi dumps a color version (rgb) of a framebuffer 
// to stdout, which you can pipe to a file or some shit idk
void dump_ppm(u8 * fb, int width, int height) {
   log("Dumping framebuffer %dx%d", width, height);
   printf("P3\n%d %d\n%d\n# Image start\n", width, height, CDEPTH);
   for(int i = 0; i < width * height * 3; i+=3)
      printf("%d %d %d\n", fb[i], fb[i+1], fb[i+2]);
   printf("\n");
}

int main() {
   log("Program start");

   const int width = 512;
   const int height = 512;
   const int fbsize = width * height * 3 * sizeof(u8);

   u8 * fb = malloc(fbsize);
   if(!fb) {
      panic("Can't allocate framebuffer");
   }
   memset(fb, 0, fbsize);

   // We actually stretch a texture

   dump_ppm(fb, width, height);

   log("Program end");
}