a-game

commit 51cb312527969d63ebfcc22319583498d00c317f
parent b687b427c267ffbfbc2c9a614c5a6c823b9aa0a9
Author: amin <dev@aminmesbah.com>
Date:   Tue,  2 Jul 2019 00:13:08 +0000

Configure allocator with properly sized buffer

FossilOrigin-Name: 8157231a74da6c8f29b37bef56a2f26b6d9db56d866d15a67d7e6fd040035554
Diffstat:
M
src/platform_wasm.c
 | 
5
+++--
M
src/platform_wasm_loader.js
 | 
9
++++++---

2 files changed, 9 insertions(+), 5 deletions(-)
diff --git a/src/platform_wasm.c b/src/platform_wasm.c
@@ -51,11 +51,12 @@ int wasm_print(const char *format, ...)
     return 0;
 }
 
-bool init(void)
+bool init(i32 num_wasm_memory_pages)
 {
     bool init_successful = true;
     game_memory = (struct GameMemory) {
-        .buffer_size = MEBIBYTES(64),
+        // NOTE(amin): each wasm memory page is 64KiB
+        .buffer_size = num_wasm_memory_pages * KIBIBYTES(64),
         .platform = {
             &wasm_read_entire_file,
             &wasm_memory_free,
diff --git a/src/platform_wasm_loader.js b/src/platform_wasm_loader.js
@@ -11,6 +11,8 @@ let gl_id_map = [null];
 // By the way: Thanks a lot, W3C, for not having any standardized _numeric_
 // representation of a key.
 const key_numeric_codes = {
+    // Code strings are from:
+    // https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/code/code_values
     ArrowLeft: 0,
     ArrowRight: 1,
     ArrowUp: 2,
@@ -248,11 +250,12 @@ window.onload = async function() {
     files[0] = file_load("binary.wasm");
     files[1] = file_load("shader/main_f.glsl");
     files[2] = file_load("shader/main_v.glsl");
-    for(var i=0; i<files.length; i++) {
+    for(var i = 0; i < files.length; i++) {
         files[i] = await files[i];
     }
     let binary = files[0];
-    imports['memory'] = new WebAssembly.Memory({'initial':32});
+    let num_memory_pages = 64; // 64pages * 64KiB/page = 4096KiB = 4MiB
+    imports['memory'] = new WebAssembly.Memory({initial: num_memory_pages});
     memory = new Uint8Array(imports['memory']['buffer']);
     let program = await WebAssembly.instantiate(binary, {"env":imports});
     let instance = program['instance'];
@@ -261,7 +264,7 @@ window.onload = async function() {
     window.addEventListener("resize", canvas_resize);
     window.addEventListener("keyup", (event) => {on_key_event(event, false)}, false);
     window.addEventListener("keydown", (event) => {on_key_event(event, true)}, false);
-    if(!exports['init']()) {
+    if(!exports['init'](num_memory_pages)) {
         error_fatal("Game initialization failed.");
     }
     canvas_render();