aiden/video-shader-toys
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Text rendering
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Aiden
2026-05-21 15:39:37 +10:00
parent 09efe2d6a0
commit df0a77ef01
8 changed files with 107 additions and 52 deletions
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30
shaders/text-overlay/shader.slang
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@@ -16,11 +16,18 @@ float sdfCoverage(float2 uv, float edge, float aa)
return smoothstep(edge - aa, edge + aa, distance);
}
float coverage(float distance, float edge, float aa)
{
return smoothstep(edge - aa, edge + aa, distance);
}
float4 shadeVideo(ShaderContext context)
{
float2 resolution = max(context.outputResolution, float2(1.0, 1.0));
float aspect = resolution.x / resolution.y;
float2 textSize = float2(0.72 * scale, 0.09 * scale * aspect);
float textHeight = 0.09 * scale * aspect;
float textWidth = textHeight * max(titleTextTextureAspect, 0.01) / aspect;
float2 textSize = float2(textWidth, textHeight);
float2 safeTextSize = max(textSize, float2(0.0001, 0.0001));
float2 textUv = (context.uv - position) / safeTextSize;
bool insideTextRect = textUv.x >= 0.0 && textUv.x <= 1.0 && textUv.y >= 0.0 && textUv.y <= 1.0;
@@ -30,20 +37,15 @@ float4 shadeVideo(ShaderContext context)
float aa = max(fwidth(distance) * (1.75 + softness * 5.0), 0.0025);
float2 pixelTextUv = (1.0 / resolution) / safeTextSize;
float2 sampleOffset = pixelTextUv * 0.38;
float msdfDistance = sampleTitleTextMsdf(textUv);
float fill = (
sdfCoverage(textUv, edge, aa) * 2.0 +
sdfCoverage(textUv + float2(sampleOffset.x, sampleOffset.y), edge, aa) +
sdfCoverage(textUv + float2(-sampleOffset.x, sampleOffset.y), edge, aa) +
sdfCoverage(textUv + float2(sampleOffset.x, -sampleOffset.y), edge, aa) +
sdfCoverage(textUv + float2(-sampleOffset.x, -sampleOffset.y), edge, aa)) / 6.0;
float outlineDistance = outlineWidth * 0.16;
float outlineEdge = edge - outlineDistance;
float outline = (
sdfCoverage(textUv, outlineEdge, aa) * 2.0 +
sdfCoverage(textUv + float2(sampleOffset.x, sampleOffset.y), outlineEdge, aa) +
sdfCoverage(textUv + float2(-sampleOffset.x, sampleOffset.y), outlineEdge, aa) +
sdfCoverage(textUv + float2(sampleOffset.x, -sampleOffset.y), outlineEdge, aa) +
sdfCoverage(textUv + float2(-sampleOffset.x, -sampleOffset.y), outlineEdge, aa)) / 6.0;
coverage(msdfDistance, edge, aa) * 2.0 +
coverage(sampleTitleTextMsdf(textUv + float2(sampleOffset.x, sampleOffset.y)), edge, aa) +
coverage(sampleTitleTextMsdf(textUv + float2(-sampleOffset.x, sampleOffset.y)), edge, aa) +
coverage(sampleTitleTextMsdf(textUv + float2(sampleOffset.x, -sampleOffset.y)), edge, aa) +
coverage(sampleTitleTextMsdf(textUv + float2(-sampleOffset.x, -sampleOffset.y)), edge, aa)) / 6.0;
float outlineEdge = edge - min(outlineWidth * 0.7, 0.48);
float outline = coverage(distance, outlineEdge, aa);
float outlineAlpha = saturate(outline - fill) * outlineColor.a;
float fillAlpha = fill * fillColor.a;
float textAlpha = max(fillAlpha, outlineAlpha);