GfxTexture *TileMapLayer_create_atlas(TileMapLayer *layer, TileMap *map) {
int i = 0;
if (layer->raw_atlas == NULL) {
layer->raw_atlas = malloc(sizeof(uint8_t) * layer->gid_count * 4);
check(layer->raw_atlas != NULL, "Could not alloc raw atlas");
}
for (i = 0; i < layer->gid_count * 4; i += 4) {
int tile_idx = i / 4;
TilesetTile *tile = TileMap_resolve_tile_gid(map, layer->tile_gids[tile_idx]);
uint32_t first_gid = 0;
uint32_t diff_gid = UINT32_MAX;
if (tile) {
layer->tileset = tile->tileset;
first_gid = tile->tileset->first_gid;
diff_gid = layer->tile_gids[tile_idx] - first_gid;
free(tile);
}
layer->raw_atlas[i] = (diff_gid & 0x000000ff);
layer->raw_atlas[i+1] = (diff_gid & 0x0000ff00) >> 8;
layer->raw_atlas[i+2] = (diff_gid & 0x00ff0000) >> 16;
layer->raw_atlas[i+3] = (diff_gid & 0xff000000) >> 24;
}
return GfxTexture_from_data((unsigned char **)&layer->raw_atlas,
map->cols, map->rows, GL_RGBA);
error:
return NULL;
}
GfxTexture *TileMapLayer_create_atlas(TileMapLayer *layer, TileMap *map) {
int i = 0;
if (layer->raw_atlas == NULL) {
layer->raw_atlas = malloc(sizeof(GLfloat) * layer->gid_count * 4);
check(layer->raw_atlas != NULL, "Could not alloc raw atlas");
}
int sheet_cols, sheet_rows;
for (i = 0; i < layer->gid_count * 4; i += 4) {
int tile_idx = i / 4;
TilesetTile *tile = TileMap_resolve_tile_gid(map, layer->tile_gids[tile_idx]);
uint32_t first_gid = 0;
uint32_t diff_gid = UINT32_MAX;
uint32_t this_gid = 0;
int flip_x = 0;
int flip_y = 0;
int flip_xy = 0;
float base_x = 0;
float base_y = 0;
if (tile) {
layer->tileset = tile->tileset;
sheet_cols = layer->tileset->texture->size.w / layer->tileset->tile_size.w;
sheet_rows = layer->tileset->texture->size.h / layer->tileset->tile_size.h;
first_gid = tile->tileset->first_gid;
this_gid = layer->tile_gids[tile_idx];
flip_x = this_gid & FLIPPED_HORIZONTALLY_FLAG;
flip_y = this_gid & FLIPPED_VERTICALLY_FLAG;
flip_xy = this_gid & FLIPPED_DIAGONALLY_FLAG;
this_gid &= ~(FLIPPED_HORIZONTALLY_FLAG |
FLIPPED_VERTICALLY_FLAG |
FLIPPED_DIAGONALLY_FLAG);
diff_gid = this_gid - first_gid;
int col = diff_gid % sheet_cols;
int row = diff_gid / sheet_rows;
base_x = col * layer->tileset->tile_size.w;
base_y = row * layer->tileset->tile_size.h;
base_x /= layer->tileset->texture->size.w;
base_y /= layer->tileset->texture->size.h;
free(tile);
}
// TODO support flipping
layer->raw_atlas[i] = base_x;
layer->raw_atlas[i+1] = base_y;
layer->raw_atlas[i+2] = 0.0;
layer->raw_atlas[i+3] = tile ? 1.0 : 0.0;
}
return GfxTexture_from_data((unsigned char **)&layer->raw_atlas,
map->cols, map->rows, GL_RGBA, 0, sizeof(float));
error:
return NULL;
}