49 lines
1.9 KiB
Plaintext
49 lines
1.9 KiB
Plaintext
float lineMask(float coordinate, float target, float pixelThickness, float resolution)
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{
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float halfWidth = max(pixelThickness, 0.5) * 0.5 / max(resolution, 1.0);
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float distanceToLine = abs(coordinate - target);
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float feather = halfWidth * 0.85 + (1.0 / max(resolution, 1.0));
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return 1.0 - smoothstep(halfWidth, feather, distanceToLine);
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}
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float thirdsMask(float2 uv, float2 resolution)
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{
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float thickness = max(lineThicknessPixels, 0.5);
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float mask = 0.0;
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mask = max(mask, lineMask(uv.x, 1.0 / 3.0, thickness, resolution.x));
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mask = max(mask, lineMask(uv.x, 2.0 / 3.0, thickness, resolution.x));
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mask = max(mask, lineMask(uv.y, 1.0 / 3.0, thickness, resolution.y));
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mask = max(mask, lineMask(uv.y, 2.0 / 3.0, thickness, resolution.y));
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return mask;
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}
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float crosshairMask(float2 uv, float2 resolution)
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{
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float2 pixel = (uv - 0.5) * resolution;
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float halfThickness = max(lineThicknessPixels, 0.5) * 0.5;
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float halfSize = max(crosshairSizePixels, 1.0) * 0.5;
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float halfGap = max(crosshairGapPixels, 0.0) * 0.5;
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float horizontalExtent = step(abs(pixel.x), halfSize) * (1.0 - step(abs(pixel.x), halfGap));
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float verticalExtent = step(abs(pixel.y), halfSize) * (1.0 - step(abs(pixel.y), halfGap));
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float horizontalLine = horizontalExtent * (1.0 - smoothstep(halfThickness, halfThickness + 1.5, abs(pixel.y)));
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float verticalLine = verticalExtent * (1.0 - smoothstep(halfThickness, halfThickness + 1.5, abs(pixel.x)));
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return max(horizontalLine, verticalLine);
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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 mask = 0.0;
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if (showThirds)
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mask = max(mask, thirdsMask(context.uv, resolution));
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if (showCrosshair)
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mask = max(mask, crosshairMask(context.uv, resolution));
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float opacity = saturate(lineOpacity * lineColor.a) * mask;
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float3 color = lerp(context.sourceColor.rgb, lineColor.rgb, opacity);
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return float4(color, context.sourceColor.a);
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}
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