├── .gitignore ├── LICENSE ├── asset.png ├── bitmap.c ├── bitmap.h ├── build.sh ├── game.c ├── index.html ├── stdlib.c └── utils.js /.gitignore: -------------------------------------------------------------------------------- 1 | .DS_Store 2 | game.js 3 | game.wasm 4 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright {yyyy} {name of copyright owner} 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /asset.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/samthor/wasm-game/44989a81732171481d5eb232dc0789f8ef07edb7/asset.png -------------------------------------------------------------------------------- /bitmap.c: -------------------------------------------------------------------------------- 1 | 2 | #include 3 | #include "bitmap.h" 4 | 5 | #define DIM 16 6 | 7 | uint32_t *bitmap_offset(bitmap_t *s, int x, int y) { 8 | return s->at + ((s->w * y) + x); 9 | } 10 | 11 | int spriteset_blit(bitmap_t *from, int i, bitmap_t *to, int x, int y) { 12 | int fx = (i * DIM) % from->w; 13 | int fy = ((i * DIM) / from->w) * DIM; 14 | 15 | uint32_t *src = bitmap_offset(from, fx, fy); 16 | uint32_t *dst = bitmap_offset(to, x, y); 17 | 18 | for (int j = 0; j < DIM; ++j) { 19 | memcpy(dst, src, DIM * sizeof(uint32_t)); 20 | src += from->w; 21 | dst += to->w; 22 | } 23 | 24 | return 0; 25 | } 26 | 27 | int spriteset_blit_trans(bitmap_t *from, int i, bitmap_t *to, int x, int y) { 28 | int fx = (i * DIM) % from->w; 29 | int fy = ((i * DIM) / from->w) * DIM; 30 | 31 | uint32_t *src = bitmap_offset(from, fx, fy); 32 | uint32_t *dst = bitmap_offset(to, x, y); 33 | 34 | uint32_t *to_end = to->at + (to->w * to->h); 35 | 36 | for (int j = 0; j < DIM; ++j) { 37 | 38 | // nb. prevents draw on last line 39 | if (dst >= to->at && dst <= to_end - to->w) { 40 | 41 | for (int q = 0; q < DIM; ++q) { 42 | uint32_t v = (src[q] & 0xff000000); 43 | if (v == 0xff000000) { 44 | dst[q] = src[q]; 45 | } else if (v) { 46 | // FIXME: ugly blend 47 | dst[q] += src[q]; 48 | } 49 | } 50 | 51 | } 52 | 53 | src += from->w; 54 | dst += to->w; 55 | } 56 | 57 | return 0; 58 | } 59 | 60 | int bitmap_set(bitmap_t *b, int x, int y, uint32_t v) { 61 | if (x < 0 || y < 0 || x >= b->w || y >= b->h) { 62 | return -1; 63 | } 64 | 65 | uint32_t *target = bitmap_offset(b, x, y); 66 | uint32_t prev = *target; 67 | *target = v; 68 | return prev; 69 | } 70 | -------------------------------------------------------------------------------- /bitmap.h: -------------------------------------------------------------------------------- 1 | 2 | #ifndef __BITMAP_H 3 | #define __BITMAP_H 4 | 5 | #include 6 | 7 | typedef struct { 8 | uint32_t *at; 9 | int w; 10 | int h; 11 | } bitmap_t; 12 | 13 | int spriteset_blit(bitmap_t *from, int i, bitmap_t *to, int ox, int oy); 14 | int spriteset_blit_trans(bitmap_t *from, int i, bitmap_t *to, int ox, int oy); 15 | int bitmap_set(bitmap_t *b, int x, int y, uint32_t v); 16 | 17 | #endif//__BITMAP_H 18 | -------------------------------------------------------------------------------- /build.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | 3 | set -eu 4 | emcc -O0 -s WASM=1 -s ONLY_MY_CODE=1 \ 5 | --llvm-opts "['-disable-simplify-libcalls', '-O0']" -ffreestanding -fno-builtin \ 6 | -s DEFAULT_LIBRARY_FUNCS_TO_INCLUDE="[]" \ 7 | -s LIBRARY_DEPS_TO_AUTOEXPORT="[]" \ 8 | -o game.js \ 9 | *.c 10 | 11 | -------------------------------------------------------------------------------- /game.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include "bitmap.h" 4 | 5 | static bitmap_t screen; 6 | static bitmap_t assets; 7 | 8 | EMSCRIPTEN_KEEPALIVE 9 | int game_setup(uint32_t *d, int w, int h) { 10 | screen.at = d; 11 | screen.w = w; 12 | screen.h = h; 13 | return 0; 14 | } 15 | 16 | EMSCRIPTEN_KEEPALIVE 17 | int asset_setup(uint32_t *d, int w, int h) { 18 | assets.at = d; 19 | assets.w = w; 20 | assets.h = h; 21 | return 0; 22 | } 23 | 24 | int clear() { 25 | memset(screen.at, 0, screen.w * screen.h * 4); 26 | return 0; 27 | } 28 | 29 | static int px = 32; 30 | static int py = 32; 31 | 32 | EMSCRIPTEN_KEEPALIVE 33 | int game_move(int dx, int dy) { 34 | px += dx; 35 | py += dy; 36 | return 0; 37 | } 38 | 39 | EMSCRIPTEN_KEEPALIVE 40 | int game_render() { 41 | // TODO stuff 42 | 43 | clear(); 44 | 45 | int c = 0; 46 | for (int x = 0; x < 40; ++x) { 47 | for (int y = 0; y < 30; ++y) { 48 | ++c; 49 | int asset = (c % 2) ? 0 : 2; 50 | spriteset_blit(&assets, asset, &screen, x * 16, y * 16); 51 | } 52 | } 53 | 54 | spriteset_blit_trans(&assets, 1, &screen, px, py-16); 55 | spriteset_blit_trans(&assets, 3, &screen, px, py); 56 | 57 | return 1; // something changed 58 | } -------------------------------------------------------------------------------- /index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 76 | 77 | 78 | 79 | 80 | 81 | 82 | -------------------------------------------------------------------------------- /stdlib.c: -------------------------------------------------------------------------------- 1 | 2 | #include 3 | /* 4 | void *memset(void *dst, int c, size_t n) { 5 | if (n) { 6 | char *d = dst; 7 | do { 8 | *d++ = c; 9 | } while (--n); 10 | } 11 | return dst; 12 | } 13 | 14 | void *memcpy(void *restrict dst, const void *restrict src, size_t n) { 15 | void *orig = dst; 16 | while (n > 0) { 17 | ((char *)dst)[0] = ((char *)src)[0]; 18 | ++dst; 19 | ++src; 20 | --n; 21 | } 22 | return orig; 23 | } 24 | */ -------------------------------------------------------------------------------- /utils.js: -------------------------------------------------------------------------------- 1 | 2 | /** 3 | * @param {!ArrayBuffer} bytes 4 | * @param {!Object} callbacks 5 | * @return {{wa: !WebAssembly.Instance, buffer: !TypedArray}} 6 | */ 7 | export async function create(bytes, callbacks={}) { 8 | const memory = new WebAssembly.Memory({initial: 256, maximum: 256}); 9 | const buffer = new Uint8Array(memory.buffer); 10 | 11 | const stdlib = { 12 | memcpy: function(dst, src, n) { 13 | buffer.copyWithin(dst, src, src + n); 14 | }, 15 | memset: function(dst, c, n) { 16 | buffer.fill(c, dst, dst + n); 17 | }, 18 | }; 19 | 20 | const importObject = (function() { 21 | const env = { 22 | 'abortStackOverflow': () => { throw new Error('abortStackOverflow'); }, 23 | 'table': new WebAssembly.Table({initial: 0, maximum: 0, element: 'anyfunc'}), 24 | 'tableBase': 0, 25 | 'memory': memory, 26 | 'memoryBase': 1024, 27 | 'STACKTOP': 0, 28 | 'STACK_MAX': memory.buffer.byteLength, 29 | 'DYNAMICTOP_PTR': 0, 30 | }; 31 | for (const key in callbacks) { 32 | env['_' + key] = callbacks[key]; 33 | } 34 | for (const key in stdlib) { 35 | env['_' + key] = stdlib[key]; 36 | } 37 | return {env}; 38 | }()); 39 | 40 | return {wa: await WebAssembly.instantiate(bytes, importObject), memory}; 41 | } 42 | 43 | /** 44 | * @param {string} src 45 | * @return {!Image} 46 | */ 47 | export async function loadImage(src) { 48 | return await new Promise((resolve, reject) => { 49 | const image = new Image(); 50 | image.src = src; 51 | image.onload = () => resolve(image); 52 | image.onerror = reject; 53 | }); 54 | } 55 | 56 | /** 57 | * @param {(!Image|string)} src 58 | * @return {!ImageData} 59 | */ 60 | export async function loadImageData(src) { 61 | if (typeof src === 'string') { 62 | src = await loadImage(src); 63 | } 64 | 65 | const canvas = document.createElement('canvas'); 66 | const context = canvas.getContext('2d'); 67 | canvas.width = src.width; 68 | canvas.height = src.height; 69 | 70 | context.drawImage(src, 0, 0); 71 | return context.getImageData(0, 0, src.width, src.height); 72 | } 73 | 74 | export class Alloc { 75 | /** 76 | * @param {!WebAssembly.Memory) memory 77 | */ 78 | constructor(memory) { 79 | this.memory_ = memory; 80 | this.position_ = memory.buffer.byteLength; 81 | } 82 | 83 | /** 84 | * @param {number} size 85 | * @return {!Uint8ClampedArray} 86 | */ 87 | alloc(size) { 88 | let at = this.position_ - size; 89 | at -= (at % 8); // put on boundary 90 | this.position_ = at; 91 | 92 | return new Uint8ClampedArray(this.memory_.buffer, at, size); 93 | } 94 | 95 | /** 96 | * @param {!TypedArray} from 97 | * @return {!Uint8ClampedArray} 98 | */ 99 | copy(from) { 100 | const buffer = this.alloc(from.byteLength); 101 | buffer.set(from); 102 | return buffer; 103 | } 104 | 105 | } --------------------------------------------------------------------------------