38 lines
1.5 KiB
Plaintext
38 lines
1.5 KiB
Plaintext
float alphaOver(float baseAlpha, float overAlpha)
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{
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return overAlpha + baseAlpha * (1.0 - overAlpha);
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}
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float4 compositeOver(float4 baseColor, float4 overColor)
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{
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float outAlpha = alphaOver(baseColor.a, overColor.a);
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float3 outRgb = overColor.rgb + baseColor.rgb * (1.0 - overColor.a);
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return float4(outRgb, outAlpha);
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}
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float4 shadeVideo(ShaderContext context)
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{
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float2 resolution = max(context.outputResolution, float2(1.0, 1.0));
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float aspect = resolution.x / resolution.y;
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float2 textSize = float2(0.72 * scale, 0.09 * scale * aspect);
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float2 safeTextSize = max(textSize, float2(0.0001, 0.0001));
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float2 textUv = (context.uv - position) / safeTextSize;
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bool insideTextRect = textUv.x >= 0.0 && textUv.x <= 1.0 && textUv.y >= 0.0 && textUv.y <= 1.0;
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float mask = insideTextRect ? sampleTitleText(textUv) : 0.0;
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float edge = 0.5;
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float aa = max(fwidth(mask) * 1.5, 0.006);
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float outlineAmount = min(outlineWidth * 0.25, 0.24);
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float fill = smoothstep(edge - aa, edge + aa, mask);
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float outlineField = smoothstep(edge - outlineAmount - aa, edge - outlineAmount + aa, mask);
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float outline = saturate(outlineField - fill);
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float textAlpha = max(fill * fillColor.a, outline * outlineColor.a);
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if (textAlpha <= 0.0001)
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return context.sourceColor;
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float4 base = context.sourceColor;
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float4 outlineLayer = float4(outlineColor.rgb * outlineColor.a, outline * outlineColor.a);
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float4 fillLayer = float4(fillColor.rgb * fillColor.a, fill * fillColor.a);
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return saturate(compositeOver(compositeOver(base, outlineLayer), fillLayer));
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}
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