| // Helper function: sample the visible hemisphere from a spherical cap | |
| vec3 SampleVndf_Hemisphere(vec2 u, vec3 wi) | |
| { | |
| // sample a spherical cap in (-wi.z, 1] | |
| float phi = 2.0f * M_PI * u.x; | |
| float z = fma((1.0f - u.y), (1.0f + wi.z), -wi.z); | |
| float sinTheta = sqrt(clamp(1.0f - z * z, 0.0f, 1.0f)); | |
| float x = sinTheta * cos(phi); | |
| float y = sinTheta * sin(phi); | |
| vec3 c = vec3(x, y, z); |
| package main | |
| import "core:fmt" | |
| import glm "core:math/linalg/glsl" | |
| import "core:time" | |
| import SDL "vendor:sdl2" | |
| import gl "vendor:OpenGL" | |
| main :: proc() { |
| package microui_sdl | |
| import "core:fmt" | |
| import "core:c/libc" | |
| import SDL "vendor:sdl2" | |
| import mu "vendor:microui" | |
| state := struct { | |
| mu_ctx: mu.Context, | |
| log_buf: [1<<16]byte, |
| <!-- | |
| Go to Line 153 for the start of Uniform Buffer Object related code and intro | |
| Prerequsite: | |
| You at least know what uniforms are in the context of WebGL | |
| and mininally understand the concepts involved in creating a square in WebGL | |
| --> | |
| <html> |
Percentage:
<img src="https://user-images.githubusercontent.com/16319829/81180309-2b51f000-8fee-11ea-8a78-ddfe8c3412a7.png" width=50% height=50%>
Pixels:
<img src="https://user-images.githubusercontent.com/16319829/81180309-2b51f000-8fee-11ea-8a78-ddfe8c3412a7.png" width="150" height="280">
Please consider using http://lygia.xyz instead of copy/pasting this functions. It expand suport for voronoi, voronoise, fbm, noise, worley, noise, derivatives and much more, through simple file dependencies. Take a look to https://github.com/patriciogonzalezvivo/lygia/tree/main/generative
float rand(float n){return fract(sin(n) * 43758.5453123);}
float noise(float p){
float fl = floor(p);
float fc = fract(p);