46 lines
1.3 KiB
C#
46 lines
1.3 KiB
C#
using Godot;
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using System;
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using Rokojori.Extensions;
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namespace Rokojori
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{
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/** How an image layer reads a height out of a texture.
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The single-channel entries take the height from that channel and cover the
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whole rect at full weight. The paired entries take the height from the
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colour channel and the <marked>coverage</marked> from alpha, so a cut-out
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image only affects the map where it is opaque - which is what lets a
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stamped shape with transparent corners blend in instead of writing a
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square.
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Coverage is not the same thing as height: under Add and Subtract it scales
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the contribution, under Replace it is the crossfade back to what is
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underneath. That is the same split the circle's falloff already has.
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The int values are passed to HeightMapShape.gdshader as
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shape_image_channel - do not renumber without updating the shader.
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*/
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public enum HeightMapChannel
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{
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R = 0,
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G = 1,
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B = 2,
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A = 3,
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RA = 4,
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GA = 5,
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BA = 6
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}
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public static class HeightMapChannelX
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{
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/** True for the paired entries, where alpha is read as coverage. */
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public static bool UsesAlphaCoverage( this HeightMapChannel channel )
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{
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return channel == HeightMapChannel.RA
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|| channel == HeightMapChannel.GA
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|| channel == HeightMapChannel.BA;
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}
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}
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}
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