mirror of https://git.sr.ht/~kikoodx/momento
63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-3.0-or-later */
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/* Copyright (C) 2021 KikooDX */
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#include "conf.h"
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#include "level.h"
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#include "tiles.h"
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#include <libimg.h>
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extern struct Level level;
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extern img_t const img_tileset;
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static int autotile_value(int x, int y);
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void level_draw(void)
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{
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int x;
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int y;
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const int tileset_width = img_tileset.width / TILE_WIDTH;
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y = level.height;
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while (y-- > 0) {
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const int draw_y = y * TILE_HEIGHT;
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x = level.width;
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while (x-- > 0) {
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const int draw_x = x * TILE_WIDTH;
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const Tile tile =
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level.data[x + y * level.width];
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switch (tile) {
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case TILE_VOID:
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break;
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case TILE_SOLID: {
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const int autotile =
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autotile_value(x, y) * TILE_WIDTH;
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img_render_vram(
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img_sub(img_tileset, autotile,
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TILE_HEIGHT, TILE_WIDTH,
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TILE_HEIGHT),
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draw_x, draw_y);
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} break;
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default:
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img_render_vram(
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img_sub(
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img_tileset,
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(int)(tile % tileset_width) *
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TILE_WIDTH,
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(int)(tile / tileset_width) *
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TILE_HEIGHT,
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TILE_WIDTH, TILE_HEIGHT),
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draw_x, draw_y);
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break;
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}
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}
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}
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}
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static int autotile_value(int x, int y)
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{
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return ((level_get_tile(x - 1, y) == TILE_SOLID) |
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((level_get_tile(x + 1, y) == TILE_SOLID) << 1) |
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((level_get_tile(x, y - 1) == TILE_SOLID) << 2) |
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((level_get_tile(x, y + 1) == TILE_SOLID) << 3));
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}
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