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Added zoom independent sharp edges to the SDF text example. (#1727)

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Stephan Soller 2021-04-19 19:40:34 +02:00 committed by GitHub
parent 1c45a882f7
commit 7f1068ef96
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1 changed files with 3 additions and 3 deletions
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examples/text/resources/shaders/glsl330/sdf.fs
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@ -12,14 +12,14 @@ uniform vec4 colDiffuse;
out vec4 finalColor; out vec4 finalColor;
// NOTE: Add here your custom variables // NOTE: Add here your custom variables
const float smoothing = 1.0/16.0;
void main() void main()
{ {
// Texel color fetching from texture sampler // Texel color fetching from texture sampler
// NOTE: Calculate alpha using signed distance field (SDF) // NOTE: Calculate alpha using signed distance field (SDF)
float distance = texture(texture0, fragTexCoord).a; float distanceFromOutline = texture(texture0, fragTexCoord).a - 0.5;
float alpha = smoothstep(0.5 - smoothing, 0.5 + smoothing, distance); float distanceChangePerFragment = length(vec2(dFdx(distanceFromOutline), dFdy(distanceFromOutline)));
float alpha = smoothstep(-distanceChangePerFragment, distanceChangePerFragment, distanceFromOutline);
// Calculate final fragment color // Calculate final fragment color
finalColor = vec4(fragColor.rgb, fragColor.a*alpha); finalColor = vec4(fragColor.rgb, fragColor.a*alpha);