1 files changed, 88 insertions, 0 deletions
diff --git a/code/platform.js b/code/platform.js
new file mode 100644
index 0000000..883c915
--- /dev/null
+++ b/code/platform.js
@@ -0,0 +1,88 @@
+//- Global variables
+let HEAPU8;
+
+//- Helper functions
+
+function ReadHeapString(ptr, length)
+{
+	if (length === 0 || !ptr) return '';
+	for (var hasUtf = 0, t, i = 0; !length || i != length; i++)
+	{
+		t = HEAPU8[((ptr)+(i))>>0];
+		if (t == 0 && !length) break;
+		hasUtf |= t;
+	}
+	if (!length) length = i;
+	if (hasUtf & 128)
+	{
+		for(var r=HEAPU8,o=ptr,p=ptr+length,F=String.fromCharCode,e,f,i,n,C,t,a,g='';;)
+		{
+			if(o==p||(e=r[o++],!e)) return g;
+			128&e?(f=63&r[o++],192!=(224&e)?(i=63&r[o++],224==(240&e)?e=(15&e)<<12|f<<6|i:(n=63&r[o++],240==(248&e)?e=(7&e)<<18|f<<12|i<<6|n:(C=63&r[o++],248==(252&e)?e=(3&e)<<24|f<<18|i<<12|n<<6|C:(t=63&r[o++],e=(1&e)<<30|f<<24|i<<18|n<<12|C<<6|t))),65536>e?g+=F(e):(a=e-65536,g+=F(55296|a>>10,56320|1023&a))):g+=F((31&e)<<6|f)):g+=F(e);
+		}
+	}
+	// split up into chunks, because .apply on a huge string can overflow the stack
+	for (var ret = '', curr; length > 0; ptr += 1024, length -= 1024)
+		ret += String.fromCharCode.apply(String, HEAPU8.subarray(ptr, ptr + Math.min(length, 1024)));
+	return ret;
+}
+
+//- Platform
+async function main()
+{
+ let env =
+ {
+  LogMessage: function(length, message)
+  {
+   let messageJS = ReadHeapString(message, length);
+   console.log(messageJS);
+  },
+ };
+
+ const { instance } = await WebAssembly.instantiateStreaming(
+   fetch("./game.wasm"), {env:env}
+ );
+ HEAPU8 = new Uint8Array(instance.exports.memory.buffer);
+
+ const width = instance.exports.GetBufferWidth();
+ const height = instance.exports.GetBufferHeight();
+ const bytes_per_pixel = instance.exports.GetBytesPerPixel();
+
+ const canvas = document.getElementById("graphics-canvas");
+ const ctx = canvas.getContext("2d");
+ canvas.width = width;
+ canvas.height = height;
+ //
+ //while(true)
+ //{
+ //}
+ //
+ const buffer_address = instance.exports.Buffer.value;
+ const image = new ImageData(
+                new Uint8ClampedArray(instance.exports.memory.buffer,
+                                      buffer_address,
+                                      bytes_per_pixel * width * height),
+                width,
+                height);
+
+ let prev = null;
+ function frame(timestamp)
+ {
+  let dt = (timestamp - prev)*0.001;
+  prev = timestamp;
+
+  // TODO(luca): How to get this???
+  let update_hz = 144;
+  instance.exports.RenderGradient(width, height, 1/update_hz);
+  ctx.putImageData(image, 0, 0);
+  window.requestAnimationFrame(frame);
+ }
+
+ window.requestAnimationFrame((timestamp) => {
+  prev = timestamp;
+  window.requestAnimationFrame(frame);
+ });
+}
+
+
+window.onload = main;