26 lines
760 B
GLSL
26 lines
760 B
GLSL
uniform sampler2D simplexSampler;
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vec3 noiseNormal2d(float[4] data, vec2 location, float detail)
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{
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vec3 normal = vec3(0.0, 0.0, 0.0);
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float scaling = data[0];
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float height = data[1];
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float step_scaling = data[2];
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float step_height = data[3];
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while (height > detail)
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{
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// TODO offsets
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// TODO parametrized texture scaling
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float factor;
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if (height * step_height <= detail) {
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factor = (height - detail) / (height - height * step_height);
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} else {
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factor = 1.0;
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}
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normal += (texture(simplexSampler, location * scaling / 15.0).xyz * 2.0 - 1.0) * factor;
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scaling *= step_scaling;
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height *= step_height;
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}
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return normalize(normal);
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}
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