73 lines
2.4 KiB
GLSL
73 lines
2.4 KiB
GLSL
// Adapted from "RGB Waveform" by lebek
|
|
// https://www.shadertoy.com/view/4dK3Wc
|
|
|
|
#version 150
|
|
|
|
uniform sampler2D ove_maintex;
|
|
uniform vec2 ove_resolution;
|
|
uniform vec2 ove_viewport;
|
|
uniform vec3 luma_coeffs;
|
|
|
|
uniform float waveform_scale;
|
|
uniform vec2 waveform_dims;
|
|
uniform vec4 waveform_region;
|
|
uniform vec4 waveform_uv;
|
|
|
|
in vec2 ove_texcoord;
|
|
|
|
out vec4 fragColor;
|
|
|
|
void main(void) {
|
|
vec3 col = vec3(0.0);
|
|
// Set an increment default to 10 bit encodings. This would likely be
|
|
// better served as a UI control, as waveforms will change their combing
|
|
// based on how granular the increment is set. For example, it can be
|
|
// challenging to spot 8 bit combing with an increment of 1. / 2.^8 - 1.
|
|
float increment = 1.0 / (pow(2, 10) - 1.0);
|
|
float maxb = waveform_dims.y + increment;
|
|
float minb = waveform_dims.y - increment;
|
|
|
|
// Intensity would make sense to also expose via the UI, as a density
|
|
// slider allows you to peek past certain values or reveal very low
|
|
// values. Hard coding it for now, as there isn't a clear way to have
|
|
// the various bit depth / code values always display at a consistent
|
|
// emission output strength.
|
|
float intensity = 0.10;
|
|
|
|
int y_lim = int(waveform_dims.y);
|
|
|
|
vec3 cur_col = vec3(0.0);
|
|
vec3 cur_lum = vec3(0.0);
|
|
|
|
if (
|
|
(gl_FragCoord.x >= waveform_region.x) &&
|
|
(gl_FragCoord.y >= waveform_region.y) &&
|
|
(gl_FragCoord.x < waveform_region.z) &&
|
|
(gl_FragCoord.y < waveform_region.w)
|
|
) {
|
|
// col = vec3(0.5, 0.5, 0.0);
|
|
// int start = int(waveform_region.y);
|
|
int stop = int(waveform_dims.y);
|
|
float ratio = 0.0;
|
|
float waveform_x = (ove_texcoord.x - waveform_uv.x) / waveform_scale;
|
|
float waveform_y = (ove_texcoord.y - waveform_uv.y) / waveform_scale;
|
|
for (int i = 0; i < waveform_dims.y; i++) {
|
|
ratio = float(i) / float(waveform_dims.y);
|
|
cur_col = texture(
|
|
ove_maintex,
|
|
vec2(waveform_x, ratio)
|
|
).rgb;
|
|
|
|
col += step(vec3(waveform_y - increment), cur_col) *
|
|
step(cur_col, vec3(waveform_y + increment)) * intensity;
|
|
|
|
cur_lum = vec3(dot(cur_col, luma_coeffs));
|
|
|
|
col += step(vec3(waveform_y - increment), cur_lum) *
|
|
step(cur_lum, vec3(waveform_y + increment)) * intensity;
|
|
}
|
|
}
|
|
|
|
fragColor = vec4(col, 1.0);
|
|
}
|