31 lines
1.1 KiB
Metal
Executable File
31 lines
1.1 KiB
Metal
Executable File
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#include <metal_stdlib>
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using namespace metal;
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kernel void compute(texture2d<float, access::write> output [[texture(0)]],
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constant float &timer [[buffer(1)]],
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constant float2 &mouse [[buffer(2)]],
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uint2 gid [[thread_position_in_grid]])
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{
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int width = output.get_width();
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int height = output.get_height();
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float2 uv = float2(gid) / float2(width, height);
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uv = uv * 2.0 - 1.0;
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float radius = 0.5;
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float distance = length(uv) - radius;
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// output.write(distance < 0 ? float4(1) : float4(0), gid);
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float planet = float(sqrt(radius * radius - uv.x * uv.x - uv.y * uv.y));
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// planet /= radius;
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// output.write(distance < 0 ? float4(planet) : float4(0), gid);
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float3 normal = normalize(float3(uv.x, uv.y, planet));
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// output.write(distance < 0 ? float4(float3(normal), 1) : float4(0), gid);
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float3 source = normalize(float3(cos(timer), sin(timer), 1));
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// float3 source = normalize(float3(-1, 0, 1));
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float light = dot(normal, source);
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output.write(distance < 0 ? float4(float3(light), 1) : float4(0), gid);
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}
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