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#include <raylib.h>
#include <stdlib.h>
#include <stdio.h>
const int i = 1;
#define is_bigendian() ( (*(char*)&i) == 0 )
void textureFromPixels(Texture2D *loc, Color *pixels, int width, int height) {
Image checkedIm = {
.data = pixels,
.width = width,
.height = height,
.format = PIXELFORMAT_UNCOMPRESSED_R8G8B8A8,
.mipmaps = 1
};
*loc = LoadTextureFromImage(checkedIm);
UnloadImage(checkedIm);
}
void processTilemapTexture(Texture2D *loc, char * tilelayout, int width, int height) {
Color *pixels = (Color*) malloc(width * height * sizeof(Color));
for (int i = 0; i < width*height; i++) {
pixels[i] = (Color){ tilelayout[i], 0, 0, 0 };
}
textureFromPixels(loc, pixels, width, height);
}
//! read rgba image from file
void readrgba(Texture2D *loc, int width, int height, FILE *file) {
Color *pixels = malloc(width*height*4);
fread(pixels, (size_t) width*height*4, (size_t) 1, file);
textureFromPixels(loc, pixels, width, height);
}
//! read a big endian bytes from file
int readb(char * out, size_t noBytes, FILE * file) {
if (!fread(out, (size_t)1, (size_t) noBytes, file))
return 1;
if (is_bigendian())
return 0;
int tmp;
// reverse byte order
for(int i = 0; i < noBytes/2; i++) {
tmp = out[i];
out[i] = out[noBytes-i-1];
out[noBytes-i-1] = tmp;
}
return 0;
}
//! load tilemap data from file
int loadTileMap(char * filename, Texture2D * tilemap, Texture2D * atlas, int * atlasSize) {
int width, height, tilebytes, tilesize, atlasWidth, atlasHeight;
char * tilelayout;
FILE * file;
if (!(file = fopen(filename, "rb"))) {
fprintf(stderr, "Failed to load %s\n", filename);
return 1;
}
// skip header
fseek(file, 10, SEEK_CUR);
// 4 bytes for int width
readb((char *)&width, 4, file);
// 4 bytes for int height
readb((char *)&height, 4, file);
// 4 bytes saying how big each tile is
readb((char *)&tilebytes, 4, file);
tilelayout = malloc(width*height*tilebytes);
fread(tilelayout, tilebytes, width*height, file);
// create a texture from the tilelayout data
processTilemapTexture(tilemap, tilelayout, width, height);
// read the pixel size of each tile
readb((char *)&tilesize, 4, file);
// read the atlas size
readb((char *)&atlasWidth, 4, file);
readb((char *)&atlasHeight, 4, file);
atlasSize[0] = atlasWidth;
atlasSize[1] = atlasHeight;
// read the atlas itself
readrgba(atlas, atlasWidth * tilesize, atlasHeight * tilesize, file);
fclose(file);
return 0;
}
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