30 lines
1.2 KiB
HLSL
30 lines
1.2 KiB
HLSL
// Unity built-in shader source. Copyright (c) 2016 Unity Technologies. MIT license (see license.txt)
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#ifndef UNITY_UI_INCLUDED
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#define UNITY_UI_INCLUDED
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inline float UnityGet2DClipping (in float2 position, in float4 clipRect)
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{
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float2 inside = step(clipRect.xy, position.xy) * step(position.xy, clipRect.zw);
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return inside.x * inside.y;
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}
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inline fixed4 UnityGetUIDiffuseColor(in float2 position, in sampler2D mainTexture, in sampler2D alphaTexture, fixed4 textureSampleAdd)
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{
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return fixed4(tex2D(mainTexture, position).rgb + textureSampleAdd.rgb, tex2D(alphaTexture, position).r + textureSampleAdd.a);
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}
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// This piecewise approximation has a precision better than 0.5 / 255 in gamma space over the [0..255] range
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// i.e. abs(l2g_exact(g2l_approx(value)) - value) < 0.5 / 255
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// It is much more precise than GammaToLinearSpace but remains relatively cheap
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half3 UIGammaToLinear(half3 value)
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{
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half3 low = 0.0849710 * value - 0.000163029;
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half3 high = value * (value * (value * 0.265885 + 0.736584) - 0.00980184) + 0.00319697;
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// We should be 0.5 away from any actual gamma value stored in an 8 bit channel
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const half3 split = (half3)0.0725490; // Equals 18.5 / 255
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return (value < split) ? low : high;
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}
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#endif
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