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// Scene1 effect shader - ShaderToy conversion (raymarching cube & sphere)
// Source: Saturday cubism experiment by skal
#include "common_uniforms"
#include "math/color"
#include "math/utils"
#include "sdf_primitives"
#include "render/raymarching"
@group(0) @binding(0) var<uniform> uniforms: CommonUniforms;
const PI: f32 = 3.141592654;
const TAU: f32 = 6.283185307;
// Colors (precomputed HSV conversions)
const skyCol = vec3<f32>(0.176, 0.235, 0.25); // HSV(0.57, 0.90, 0.25)
const skylineCol = vec3<f32>(0.5, 0.125, 0.025); // HSV(0.02, 0.95, 0.5)
const sunCol = vec3<f32>(0.5, 0.163, 0.025); // HSV(0.07, 0.95, 0.5)
const diffCol1 = vec3<f32>(0.4, 1.0, 1.0); // HSV(0.60, 0.90, 1.0)
const diffCol2 = vec3<f32>(0.325, 1.0, 0.975); // HSV(0.55, 0.90, 1.0)
// Lighting (normalized manually)
const sunDir1 = vec3<f32>(0.0, 0.04997, -0.99875); // normalize(0, 0.05, -1)
const lightPos1 = vec3<f32>(10.0, 10.0, 10.0);
const lightPos2 = vec3<f32>(-10.0, 10.0, -10.0);
fn rayPlane(ro: vec3<f32>, rd: vec3<f32>, plane: vec4<f32>) -> f32 {
return -(dot(ro, plane.xyz) + plane.w) / dot(rd, plane.xyz);
}
var<private> g_rot0: mat2x2<f32>;
fn render0(ro: vec3<f32>, rd: vec3<f32>) -> vec3<f32> {
var col = vec3<f32>(0.0);
var sf = 1.0001 - max(dot(sunDir1, rd), 0.0);
col += skyCol * pow((1.0 - abs(rd.y)), 8.0);
col += clamp(vec3<f32>(mix(0.0025, 0.125, tanh_approx(0.005 / sf)) / abs(rd.y)) * skylineCol, vec3<f32>(0.0), vec3<f32>(10.0));
sf *= sf;
col += sunCol * 0.00005 / sf;
let tp1 = rayPlane(ro, rd, vec4<f32>(0.0, -1.0, 0.0, 6.0));
if (tp1 > 0.0) {
let pos = ro + tp1 * rd;
let pp = pos.xz;
let db = sdBox2D(pp, vec2<f32>(5.0, 9.0)) - 3.0;
col += vec3<f32>(4.0) * skyCol * rd.y * rd.y * smoothstep(0.25, 0.0, db);
col += vec3<f32>(0.8) * skyCol * exp(-0.5 * max(db, 0.0));
}
return clamp(col, vec3<f32>(0.0), vec3<f32>(10.0));
}
fn df(p_in: vec3<f32>) -> f32 {
var p = p_in;
p.x = p_in.x * g_rot0[0][0] + p_in.z * g_rot0[0][1];
p.z = p_in.x * g_rot0[1][0] + p_in.z * g_rot0[1][1];
// Cube
var pc = p;
pc -= vec3<f32>(-1.9, 0.0, 0.0);
let dCube = sdBox(pc, vec3<f32>(1.6));
// Sphere
var ps = p;
ps -= vec3<f32>(1.3, 0.0, 0.0);
let dSphere = sdSphere(ps, 1.2);
// Ground plane
let dPlane = p.y + 1.0;
// Union
var d = min(dCube, dSphere);
d = min(d, dPlane);
return d;
}
fn boxCol(col: vec3<f32>, nsp: vec3<f32>, rd: vec3<f32>, nnor: vec3<f32>, nrcol: vec3<f32>, nshd1: f32, nshd2: f32) -> vec3<f32> {
var nfre = 1.0 + dot(rd, nnor);
nfre *= nfre;
let nld1 = normalize(lightPos1 - nsp);
let nld2 = normalize(lightPos2 - nsp);
var ndif1 = max(dot(nld1, nnor), 0.0);
ndif1 *= ndif1;
var ndif2 = max(dot(nld2, nnor), 0.0);
ndif2 *= ndif2;
var scol = vec3<f32>(0.0);
let rf = smoothstep(1.0, 0.9, nfre);
scol += diffCol1 * ndif1 * nshd1;
scol += diffCol2 * ndif2 * nshd2;
scol += 0.1 * (skyCol + skylineCol);
scol += nrcol * 0.75 * mix(vec3<f32>(0.25), vec3<f32>(0.5, 0.5, 1.0), nfre);
return mix(col, scol, rf * smoothstep(90.0, 20.0, dot(nsp, nsp)));
}
fn render1(ro: vec3<f32>, rd: vec3<f32>) -> vec3<f32> {
let skyCol_local = render0(ro, rd);
var col = skyCol_local;
let nt = rayMarch(ro, rd, 0.0);
if (nt < MAX_RAY_LENGTH) {
let nsp = ro + rd * nt;
let nnor = normal(nsp);
let nref = reflect(rd, nnor);
let nrt = rayMarch(nsp, nref, 0.2);
var nrcol = render0(nsp, nref);
if (nrt < MAX_RAY_LENGTH) {
let nrsp = nsp + nref * nrt;
let nrnor = normal(nrsp);
let nrref = reflect(nref, nrnor);
nrcol = boxCol(nrcol, nrsp, nref, nrnor, render0(nrsp, nrref), 1.0, 1.0);
}
let nshd1 = mix(0.0, 1.0, shadow(nsp, normalize(lightPos1 - nsp), 0.1, distance(lightPos1, nsp)));
let nshd2 = mix(0.0, 1.0, shadow(nsp, normalize(lightPos2 - nsp), 0.1, distance(lightPos2, nsp)));
col = boxCol(col, nsp, rd, nnor, nrcol, nshd1, nshd2);
}
return col;
}
fn effect(p: vec2<f32>) -> vec3<f32> {
g_rot0 = rot(-0.2 * uniforms.time);
let fov = tan(TAU / 6.0);
let ro = vec3<f32>(0.0, 2.5, 5.0);
let la = vec3<f32>(0.0, 0.0, 0.0);
let up = vec3<f32>(0.1, 1.0, 0.0);
let ww = normalize(la - ro);
let uu = normalize(cross(up, ww));
let vv = cross(ww, uu);
let rd = normalize(-p.x * uu + p.y * vv + fov * ww);
return render1(ro, rd);
}
#include "render/fullscreen_vs"
@fragment fn fs_main(@builtin(position) p: vec4<f32>) -> @location(0) vec4<f32> {
// Flip Y to match ShaderToy convention (origin at bottom-left)
let flipped = vec2<f32>(p.x, uniforms.resolution.y - p.y);
let q = flipped / uniforms.resolution;
var coord = -1.0 + 2.0 * q;
coord.x *= uniforms.resolution.x / uniforms.resolution.y;
var col = effect(coord);
col = aces_approx(col);
col = sRGB(col);
return vec4<f32>(col, 1.0);
}
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