51 lines
1.8 KiB
Plaintext
51 lines
1.8 KiB
Plaintext
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#pragma once
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static const int RainbowColorsSize = 16;
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static const float3 RainbowColors[RainbowColorsSize] = {
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float3(1.00, 0.05, 0.05), // 0 red
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float3(0.45, 0.00, 0.00), // 1 dark red
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float3(1.00, 0.20, 0.00), // 2 orange
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float3(0.20, 0.05, 0.01), // 3 dark orange (brown)
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float3(1.00, 1.00, 0.00), // 4 yellow
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float3(0.35, 0.45, 0.00), // 5 olive
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float3(0.00, 1.00, 0.00), // 6 green
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float3(0.00, 0.30, 0.00), // 7 dark green
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float3(0.00, 1.00, 1.00), // 10 cyan
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float3(0.00, 0.40, 0.40), // 11 dark cyan
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float3(0.00, 0.00, 1.00), // 8 blue
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float3(0.00, 0.00, 0.25), // 9 dark blue
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float3(0.25, 0.00, 1.00), // 12 purple
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float3(0.10, 0.00, 0.25), // 13 dark purple
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float3(1.00, 0.05, 1.00), // 14 pink
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float3(0.45, 0.00, 0.25) // 15 dark pink
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};
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// Given a color index, find the associated color.
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// If NColors is 8 or less, skips the "dark" colors.
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// If NColors is 4 or less, skips 3 out of 4 colors.
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//
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float3 RainbowColorLookup(int coloridx, int ncolors)
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{
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if (ncolors <= 8) coloridx *= 2;
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if (ncolors <= 4) coloridx *= 2;
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float3 color = float3(1,1,1);
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if (coloridx < RainbowColorsSize) color = RainbowColors[coloridx];
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return color;
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}
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// Create a striped rainbow pattern. The pattern has ncolors
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// color bands, separated by thin white lines. Using the mask,
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// which is a bitmask, you can turn any band to black.
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//
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float3 MaskedRainbowPattern(float texcoord, int ncolors, int mask)
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{
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float bandPos = texcoord * ncolors;
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int coloridx = (int)floor(fmod(bandPos, ncolors));
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float3 color = RainbowColorLookup(coloridx, ncolors);
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if (mask & (1 << coloridx)) color = float3(0, 0, 0);
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float edge = frac(bandPos);
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if ((edge <= 0.1) || (edge >= 0.9)) color = float3(1, 1, 1);
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return color;
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}
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