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Fix unpacking of msdf markup params #4600

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Sep 22, 2022
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Fix unpacking of msdf markup params #4600

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21 changes: 12 additions & 9 deletions src/graphics/program-lib/chunks/common/vert/msdf.js
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Original file line number Diff line number Diff line change
Expand Up @@ -8,20 +8,23 @@ varying vec4 shadow_color;
varying vec2 shadow_offset;

void unpackMsdfParams() {
outline_color.rb = mod(vertex_outlineParameters.xy, 256.) / 256.;
outline_color.ga = vertex_outlineParameters.xy / 256. / 256.;
vec3 little = mod(vertex_outlineParameters, 256.);
vec3 big = (vertex_outlineParameters - little) / 256.;

outline_color.rb = little.xy / 255.;
outline_color.ga = big.xy / 255.;

// _outlineThicknessScale === 0.2
outline_thickness = vertex_outlineParameters.z / 255. * 0.2;
outline_thickness = little.z / 255. * 0.2;

vec3 little = mod(vertex_shadowParameters, 256.) / 256.;
vec3 big = vertex_shadowParameters / 256. / 256.;
little = mod(vertex_shadowParameters, 256.);
big = (vertex_shadowParameters - little) / 256.;

shadow_color.rb = little.xy;
shadow_color.ga = big.xy;
shadow_color.rb = little.xy / 255.;
shadow_color.ga = big.xy / 255.;

// vec2(little.z, big.z) * 2. srink from (0.5, 0.5) to (1, 1)
// vec2(little.z, big.z) / 127. - 1. remaps shadow offset from [0, 254] to [-1, 1]
// _shadowOffsetScale === 0.005
shadow_offset = (vec2(little.z, big.z) * 2. - 1.) * 0.005;
shadow_offset = (vec2(little.z, big.z) / 127. - 1.) * 0.005;
}
`;