<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=600">
<meta http-equiv="Content-type" content="text/html; charset=utf-8">
<title>WebMetal 2D demo</title>
<link rel="stylesheet" href="shared.css">
<link rel="stylesheet" href="https://webkit.org/wp-content/themes/webkit/style.css">
<link rel="stylesheet" href="https://www.apple.com/wss/fonts?family=Myriad+Set+Pro&amp;v=1">
<script src="shared.js"></script>
<script src="2d.js"></script>
<script id="library" type="x-shader/x-metal">
#include <metal_stdlib>

using namespace metal;

struct Vertex
{
    float4 position [[position]];
};

struct Uniform
{
    float2 resolution;
    float time;
};

vertex Vertex vertex_main(device Vertex *vertices [[buffer(0)]],
                          constant Uniform *uniforms [[buffer(1)]],
                          uint vid [[vertex_id]])
{
    return vertices[vid];
}

fragment float4 fragment_main(Vertex vertexIn [[stage_in]], constant Uniform *uniforms [[buffer(0)]])
{
    float2 position = vertexIn.position.xy / uniforms->resolution.xy;

    float color = 0.0;
    float time = uniforms->time;
    color += sin(position.x * cos(time / 7.0) * 90.0) + cos(position.y * cos(time / 17.0) * 15.0);
    color += sin(position.y * sin(time / 13.0) * 35.0) + cos(position.x * sin(time / 27.0) * 35.0);
    color += sin(position.x * sin(time / 5.0) * 15.0) + sin(position.y * sin(time / 31.0) * 90.0);
    color *= sin(time / 10.0) * 0.5;

    return float4(color, color * 0.5 + sin(time / 10), sin(color + time / 3.0) * 0.75, 1.0);
}
</script>
</head>
<body>
<canvas></canvas>
<div id="error">
    <h2>WebMetal not available</h2>
    <p>
        Make sure you are on a system with WebMetal enabled. In
        Safari, first make sure the Developer Menu is visible (Preferences →
        Advanced), then Develop → Experimental Features → Enable WebMetal.
    </p>
</div>
</body>
</html>