46 lines
1.9 KiB
Swift
46 lines
1.9 KiB
Swift
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let shader =
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"#include <metal_stdlib>\n" +
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"using namespace metal;" +
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"kernel void k(texture2d<float,access::write> o[[texture(0)]]," +
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" uint2 gid[[thread_position_in_grid]]) {" +
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" int width = o.get_width();" +
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" int height = o.get_height();" +
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" float2 uv = float2(gid) / float2(width, height);" +
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" float3 color = mix(float3(1.0, 0.6, 0.1), float3(0.5, 0.8, 1.0), sqrt(1 - uv.y));" +
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" float2 q = uv - float2(0.67, 0.25);" +
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" float r = 0.2 + 0.1 * cos(atan2(q.x, q.y) * 9.0 + 20.0 * q.x);" +
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" color *= smoothstep(r, r + 0.01, length(q));" +
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" r = 0.03 + 0.002 * cos(120.0 * q.y) + exp(-50.0 * (1.0 - uv.y));" +
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" color *= 1.0 - (1.0 - smoothstep(r, r + 0.002, abs(q.x - 0.25 * sin(2.0 * q.y)))) * smoothstep(0.0, 0.1, q.y);" +
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" o.write(float4(color, 1.0), gid);" +
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"}"
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//"#include <metal_stdlib>\n" +
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// "using namespace metal;" +
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// "kernel void k(texture2d<float,access::write> o[[texture(0)]]," +
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// " uint2 gid[[thread_position_in_grid]]) {" +
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// " int width = o.get_width();" +
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// " int height = o.get_height();" +
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// " float2 uv = float2(gid) / float2(width, height);" +
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// " float2 q = uv - float2(0.5);" +
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// " float a = atan2(q.y, q.x) + 0.25;" +
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// " float s = 0.5 + 0.5 * sin(3.0 * a);" +
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// " float t = 0.15 + 0.5 * pow(s, 0.3) + 0.1 * pow(0.5 + 0.5 * cos(6.0 * a), 0.5);" +
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// " float h = sqrt(dot(q, q)) / t;" +
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// " float f = 0.0;" +
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// " if(h < 0.4) f = 1.0;" +
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// " float3 color = mix(float3(0.9), float3(0.5 * h, 0.5 + 0.5 * h, 0.0), f);" +
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// " o.write(float4(color, 1.0), gid);" +
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//"}"
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import MetalKit
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import PlaygroundSupport
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let frame = CGRect(x: 0, y: 0, width: 300, height: 300)
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let view = MTKView(frame: frame)
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let delegate = MetalView(mtkView: view, shader: shader)
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view.delegate = delegate
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PlaygroundPage.current.liveView = view
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