wehub-resource-sync
57 lines
1.5 KiB
HLSL
57 lines
1.5 KiB
HLSL
// this code implements this shader in hlsl, https://www.shadertoy.com/view/XlBcRV
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sampler texSampler : register(s0);
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Texture2D<float4> inputTextureA : register(t0);
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cbuffer ParamConstants : register(b0)
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{
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float Scale;
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}
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cbuffer TimeConstants : register(b1)
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{
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float globalTime;
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float time;
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float runTime;
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float beatTime;
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}
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cbuffer Resolution : register(b2)
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{
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float TargetWidth;
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float TargetHeight;
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}
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struct vsOutput
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{
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float4 position : SV_POSITION;
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float2 texCoord : TEXCOORD;
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};
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#define mod(x,y) (x-y*floor(x/y))
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float4 psMain(vsOutput psInput) : SV_TARGET{
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float width, height;
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inputTextureA.GetDimensions(width, height);
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float2 iResolution = float2(width, height).xy;
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float blockSize = 5. + iResolution.y / Scale;
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float2 within_block = mod(psInput.position.xy, blockSize) - float2(.5 * blockSize, .5*blockSize);
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float2 block = psInput.position.xy - within_block;
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float2 uv = block.xy / iResolution.xy;
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float2 flow = inputTextureA.Sample(texSampler, uv).rg - float2(.5, .5);
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float lineness = abs(dot(normalize(flow.yx * float2(-1.,1.)), within_block));
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float alongness = (dot(flow, within_block) / blockSize);
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float dark = smoothstep(.2 * blockSize, .0, lineness) *
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step(alongness, dot(flow, flow)) * step(.0, alongness);
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float ballness = smoothstep(3., 1., dot(within_block, within_block));
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if (dot(flow, flow) < 1.e-6) {
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return float4(ballness.rr,1, 1.);
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} else {
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return float4((dark + ballness).rr, 0, 1.);
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}
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}
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