Troy James Sobotka
b9a62eb1aa
Adding waveform lines. Still requires scaling to fit in arbitrary range.
59 lines
2.0 KiB
GLSL
59 lines
2.0 KiB
GLSL
// Adapted from "RGB Waveform" by lebek
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// https://www.shadertoy.com/view/4dK3Wc
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#version 150
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uniform sampler2D ove_maintex;
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uniform vec2 ove_resolution;
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uniform vec2 ove_viewport;
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uniform vec3 luma_coeffs;
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in vec2 ove_texcoord;
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out vec4 fragColor;
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void main(void) {
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vec3 col = vec3(0.0);
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// Set an increment default to 10 bit encodings. This would likely be
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// better served as a UI control, as waveforms will change their combing
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// based on how granular the increment is set. For example, it can be
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// challenging to spot 8 bit combing with an increment of 1. / 2.^8 - 1.
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float increment = 1.0 / (pow(2, 10) - 1.0);
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float maxb = ove_texcoord.y + increment;
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float minb = ove_texcoord.y - increment;
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// Intensity would make sense to also expose via the UI, as a density
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// slider allows you to peek past certain values or reveal very low
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// values. Hard coding it for now, as there isn't a clear way to have
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// the various bit depth / code values always display at a consistent
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// emission output strength.
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float intensity = 0.10;
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int y_lim = int(ove_resolution.y);
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vec3 cur_col = vec3(0.0);
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vec3 cur_lum = vec3(0.0);
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for (int i = 0; i < y_lim; i++) {
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cur_col = texture2D(
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ove_maintex,
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vec2(ove_texcoord.x, float(i) / float(ove_resolution.y))
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).rgb;
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col += step(vec3(ove_texcoord.y - increment), cur_col) *
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step(cur_col, vec3(ove_texcoord.y + increment)) * intensity;
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// TODO: Implement proper luma / luminance based values.
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// This is simply taking the luminance weights derived from the
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// OCIO configuration or the RGB to XYZ matrix and multiplying
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// the above step approach by the luminance weights.
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// EG:
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cur_lum = vec3(dot(cur_col, luma_coeffs));
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col += step(vec3(ove_texcoord.y - increment), cur_lum) *
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step(cur_lum, vec3(ove_texcoord.y + increment)) * intensity;
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}
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gl_FragColor = vec4(col, 1.0);
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}
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