#pragma pack(push,1)
typedef struct {
  unsigned char  idLength;
  unsigned char  colormapType;
  unsigned char  imageType;
  unsigned short colormapIndex;
  unsigned short colormapLength;
  unsigned char  colormapSize;
  unsigned short xOrigin;
  unsigned short yOrigin;
  unsigned short width;
  unsigned short height;
  unsigned char  pixelSize;
  unsigned char  attributes;
} TgaHeader;
#pragma pack(pop)


int imageLoadTga(const char *path, int *outWidth, int *outHeight, unsigned char **pixels) {
  *outWidth = *outHeight = 0; *pixels = NULL;

	FILE *f = fopen(path, "rb");
	if (!f) {
    fprintf(stderr, "Cannot open for read: %s\n", path);
    fflush(stderr);
    return FALSE;
  }

	TgaHeader header = {};
	fread(&header, sizeof(header), 1, f); // todo: endianess

	//printf("%d %d %d %d %d\n", header.imageType, header.width, header.height, header.colormapType, header.pixelSize);

	if ( header.imageType != 2
	  || !header.width
	  || !header.height
	  || header.colormapType
	  || (header.pixelSize != 24 && header.pixelSize != 32)
  ) {
    fprintf(stderr, "Unsupported format. Only uncompressed 24 or 32 bits TGA are supported: %s\n", path);
    fflush(stderr);
    return FALSE;
	}

  fseek(f, header.idLength, SEEK_CUR);

  *outWidth = header.width;
  *outHeight = header.height;
  int rowSize = *outWidth*4;
  int size = *outHeight*rowSize;
  *pixels = (unsigned char*)calloc(1, size);
  unsigned char *row = *pixels + size;
  for(unsigned short r = header.height; r; --r, row -= rowSize) {
    for(unsigned char *c = row - rowSize; c < row; c += 4) {
      c[2] = fgetc(f);
      c[1] = fgetc(f);
      c[0] = fgetc(f);
      c[3] = header.pixelSize == 32 ? fgetc(f) : 255;
    }
  }
	fclose(f);

	return TRUE;
}


int imageSaveTga(const char *path, int width, int height, const unsigned char *pixels) {
  if (width <= 0 || height <= 0 || !pixels) return FALSE;

	FILE *f = fopen(path, "wb");
	if (!f) {
    fprintf(stderr, "Cannot open file for write: %s\n", path);
    fflush(stderr);
    return FALSE;
  }

	TgaHeader header = {};
	header.imageType = 2;
	header.width = width;
	header.height = height;
	header.pixelSize = 32;
	fwrite(&header, sizeof(header), 1, f); // todo: endianess

  int rowSize = width*4;
  int size = height*rowSize;
  const unsigned char *row = pixels + size;
  for(unsigned short r = header.height; r; --r, row -= rowSize) {
    for(const unsigned char *c = row - rowSize; c < row; c += 4) {
      fputc(c[2], f);
      fputc(c[1], f);
      fputc(c[0], f);
      fputc(c[3], f);
    }
  }
	fclose(f);

	return TRUE;
}