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#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <SDL2/SDL.h>
#include "loader.h"
#include "main.h"
#include "tilemap.h"
struct tilemap *tilemap = NULL, *next_tilemap = NULL;
#define PACKED __attribute__((__packed__))
struct PACKED sets {
uint32_t tilesets_count;
uint32_t wang_count;
};
struct PACKED map {
uint32_t width;
uint32_t height;
uint32_t layers;
uint8_t tiles[];
};
void free_tilemap(struct tilemap *tilemap) {
SDL_DestroyTexture(tilemap->tileset);
SDL_DestroyTexture(tilemap->wang_tileset);
free(tilemap->parallax);
free(tilemap->collision);
for (int i = 0; i < tilemap->layers; i++) {
SDL_DestroyTexture(tilemap->tilemaps[i]);
}
free(tilemap->tilemaps);
free(tilemap);
}
struct tilemap *load_tilemap(void const *data, size_t size) {
struct tilemap *tilemap = malloc(sizeof (struct tilemap));
if (tilemap == NULL) {
return NULL;
}
tilemap->tileset = SDL_CreateTexture(renderer, SDL_PIXELTYPE_UNKNOWN, SDL_TEXTUREACCESS_TARGET, 128, 128);
tilemap->wang_tileset = SDL_CreateTexture(renderer, SDL_PIXELTYPE_UNKNOWN, SDL_TEXTUREACCESS_TARGET, 128, 128);
SDL_SetTextureBlendMode(tilemap->wang_tileset, SDL_BLENDMODE_BLEND);
tilemap->layers = 0;
tilemap->parallax = NULL;
tilemap->collision = NULL;
tilemap->tilemaps = NULL;
struct sets const *const sets = data;
data = sets + 1;
size -= sizeof (struct sets);
char const *str = data;
int y = 0;
SDL_SetRenderTarget(renderer, tilemap->tileset);
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
SDL_RenderClear(renderer);
for (uint32_t count = sets->tilesets_count; count > 0; count--) {
int height = *(uint32_t *) str;
str += sizeof (uint32_t);
size_t len = strnlen(str, size);
if (len == size) {
goto fail;
}
void *tex = res_get_texture(str).data;
SDL_RenderCopy(renderer, tex, &(SDL_Rect) {0, 0, 128, height}, &(SDL_Rect) {0, y, 128, height});
y += height;
str += len + 1;
size -= len + 4 + 1;
}
SDL_SetRenderTarget(renderer, tilemap->wang_tileset);
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
SDL_RenderClear(renderer);
if (sets->tilesets_count) {
int height = *(uint32_t *) str;
str += sizeof (uint32_t);
size_t len = strnlen(str, size);
if (len == size) {
free_tilemap(tilemap);
return NULL;
}
void *tex = res_get_texture(str).data;
SDL_RenderCopy(renderer, tex, &(SDL_Rect) {0, 0, 128, height}, &(SDL_Rect) {0, 0, 128, height});
str += len + 1;
size -= len + 4 + 1;
}
struct map const *const map = (void *) str;
if (map->width * map->height * map->layers > size - sizeof (struct map)) {
goto fail;
}
tilemap->width = map->width;
tilemap->height = map->height;
tilemap->layers = map->layers;
tilemap->tilemaps = malloc(sizeof (void *) * tilemap->layers);
for (int l = 0; l < tilemap->layers; l++) {
SDL_Texture *layer = SDL_CreateTexture(renderer, SDL_PIXELTYPE_UNKNOWN, SDL_TEXTUREACCESS_TARGET, map->width * 8, map->height * 8);
SDL_SetTextureBlendMode(layer, SDL_BLENDMODE_BLEND);
SDL_SetRenderTarget(renderer, layer);
size_t const ll = l * map->width * map->height;
for (int y = 0; y < map->height; y++) {
size_t const yy = y * map->width;
for (int x = 0; x < map->width; x++) {
unsigned tile = map->tiles[x + yy + ll];
int tileX = tile & 0x0f;
int tileY = tile >> 4;
SDL_RenderCopy(renderer, tilemap->tileset, &(SDL_Rect) {tileX * 8, tileY * 8, 8, 8}, &(SDL_Rect) {x * 8, y * 8, 8, 8});
}
}
for (int tile = 0xf0; tile < 0x100; tile++) {
for (int y = 0; y < map->height - 1; y++) {
size_t const yy = y * map->width;
for (int x = 0; x < map->width - 1; x++) {
int tl = map->tiles[x + yy + ll] == tile;
int tr = map->tiles[x + 1 + yy + ll] == tile;
int bl = map->tiles[x + yy + map->width + ll] == tile;
int br = map->tiles[x + 1 + yy + map->width + ll] == tile;
int tileX = tl << 0 | tr << 1 | bl << 2 | br << 3;
int tileY = tile & 0x0f;
SDL_RenderCopy(renderer, tilemap->wang_tileset, &(SDL_Rect) {tileX * 8, tileY * 8, 8, 8}, &(SDL_Rect) {x * 8 + 4, y * 8 + 4, 8, 8});
}
}
}
tilemap->tilemaps[l] = layer;
}
float *parallax = (void *) (map->tiles + map->width * map->height * map->layers);
size -= (char *) parallax - (char *) map;
if (sizeof (struct parallax) * map->layers > size) {
goto fail;
}
tilemap->parallax = malloc(sizeof (struct parallax) * map->layers);
for (int i = 0; i < map->layers; i++) {
tilemap->parallax[i].x = *parallax++;
tilemap->parallax[i].y = *parallax++;
}
size -= sizeof (struct parallax) * map->layers;
SDL_SetRenderTarget(renderer, NULL);
return tilemap;
fail:
free_tilemap(tilemap);
SDL_SetRenderTarget(renderer, NULL);
return NULL;
}
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