From 70e60a3b950f17039973ccb6ea4e91ff161c58f1 Mon Sep 17 00:00:00 2001
From: LordMZTE <lord@mzte.de>
Date: Mon, 30 Oct 2023 10:22:46 +0100
Subject: [PATCH] swap wlbg shader

---
 scripts/wlbg/src/Gfx.zig      |   4 +-
 scripts/wlbg/src/bg_frag.glsl | 109 +++++++++++++++-------------------
 scripts/wlbg/src/options.zig  |   2 +-
 3 files changed, 51 insertions(+), 64 deletions(-)

diff --git a/scripts/wlbg/src/Gfx.zig b/scripts/wlbg/src/Gfx.zig
index 47508a8..09c4ac9 100644
--- a/scripts/wlbg/src/Gfx.zig
+++ b/scripts/wlbg/src/Gfx.zig
@@ -105,8 +105,8 @@ pub fn init(egl_dpy: c.EGLDisplay, output_info: []const OutputInfo) !Gfx {
             c.GL_UNSIGNED_BYTE,
             null,
         );
-        c.glTexParameteri(c.GL_TEXTURE_2D, c.GL_TEXTURE_MAG_FILTER, c.GL_NEAREST);
-        c.glTexParameteri(c.GL_TEXTURE_2D, c.GL_TEXTURE_MIN_FILTER, c.GL_NEAREST);
+        c.glTexParameteri(c.GL_TEXTURE_2D, c.GL_TEXTURE_MAG_FILTER, c.GL_LINEAR);
+        c.glTexParameteri(c.GL_TEXTURE_2D, c.GL_TEXTURE_MIN_FILTER, c.GL_LINEAR);
 
         c.glFramebufferTexture2D(
             c.GL_FRAMEBUFFER,
diff --git a/scripts/wlbg/src/bg_frag.glsl b/scripts/wlbg/src/bg_frag.glsl
index a1aa5f3..a6f1708 100644
--- a/scripts/wlbg/src/bg_frag.glsl
+++ b/scripts/wlbg/src/bg_frag.glsl
@@ -6,74 +6,61 @@ uniform float time;
 
 in vec2 fragCoord;
 
-// shader: https://www.shadertoy.com/view/ttKGDt
+// shader: https://www.shadertoy.com/view/Ms2SDc
 
-mat2 rot(float a) {
-    float c = cos(a), s = sin(a);
-    return mat2(c,s,-s,c);
+const float PI=3.14159265358979323846;
+const float value=0.0;
+
+float rand(in vec2 p,in float t) {
+    return fract(sin(dot(p+mod(t,1.0),vec2(12.9898,78.2333)))*43758.5453);
 }
 
-const float pi = acos(-1.0);
-const float pi2 = pi*2.0;
-
-vec2 pmod(vec2 p, float r) {
-    float a = atan(p.x, p.y) + pi/r;
-    float n = pi2 / r;
-    a = floor(a/n)*n;
-    return p*rot(-a);
+vec2 rotate(vec2 k,float t)	{
+    return vec2(cos(t)*k.x-sin(t)*k.y,sin(t)*k.x+cos(t)*k.y);
 }
 
-float box( vec3 p, vec3 b ) {
-    vec3 d = abs(p) - b;
-    return min(max(d.x,max(d.y,d.z)),0.0) + length(max(d,0.0));
-}
-
-float ifsBox(vec3 p) {
-    for (int i=0; i<5; i++) {
-        p = abs(p) - 1.0;
-        p.xy *= rot(time*0.3);
-        p.xz *= rot(time*0.1);
-    }
-    p.xz *= rot(time);
-    return box(p, vec3(0.4,0.8,0.3));
-}
-
-float map(vec3 p, vec3 cPos) {
-    vec3 p1 = p;
-    p1.x = mod(p1.x-5., 10.) - 5.;
-    p1.y = mod(p1.y-5., 10.) - 5.;
-    p1.z = mod(p1.z, 16.)-8.;
-    p1.xy = pmod(p1.xy, 5.0);
-    return ifsBox(p1);
+float scene1(vec3 p) {
+    float speed=time*0.5;
+    float ground=dot(p,vec3(0.0,1.0,0.0))+0.75;
+    float t1=length(abs(mod(p.xyz,2.0)-1.0))-1.35+0.05*cos(PI*p.x*4.0)+0.05*sin(PI*p.z*4.0);	// structure
+    float t3=length(max(abs(mod(p.xyz,2.0)-1.0).xz-1.0,0.5))-0.075+0.1*cos(p.y*36.0);			// structure slices
+    float t5=length(abs(mod(p.xyz,0.5))-0.25)-0.975;
+    float bubble_w=0.8+0.2*cos(PI*p.z)+0.2*cos(PI*p.x);
+    float bubble=length(mod(p.xyz,0.125)-0.0625)-bubble_w;
+    float hole_w=0.05;
+    float hole=length(abs(mod(p.xz,1.0)-0.5))-hole_w;
+    float tube_p=2.0-0.25*sin(PI*p.z*0.5);
+    float tube_v=PI*8.0;
+    float tube_b=tube_p*0.02;
+    float tube_w=tube_b+tube_b*cos(p.x*tube_v)*sin(p.y*tube_v)*cos(p.z*tube_v)+tube_b*sin(PI*p.z+speed*4.0);
+    float tube=length(abs(mod(p.xy,tube_p)-tube_p*0.5))-tube_w;
+    return min(max(min(-t1,max(-hole-t5*0.375,ground+bubble)),t3+t5),tube);
 }
 
 void main() {
-    vec2 p = fragCoord;
-
-    vec3 cPos = vec3(0.0,0.0, -3.0 * time);
-    // vec3 cPos = vec3(0.3*sin(time*0.8), 0.4*cos(time*0.3), -6.0 * time);
-    vec3 cDir = normalize(vec3(0.0, 0.0, -1.0));
-    vec3 cUp  = vec3(sin(time), 1.0, 0.0);
-    vec3 cSide = cross(cDir, cUp);
-
-    vec3 ray = normalize(cSide * p.x + cUp * p.y + cDir);
-
-    float acc = 0.0;
-    float acc2 = 0.0;
-    float t = 0.0;
-    for (int i = 0; i < 99; i++) {
-        vec3 pos = cPos + ray * t;
-        float dist = map(pos, cPos);
-        dist = max(abs(dist), 0.02);
-        float a = exp(-dist*3.0);
-        if (mod(length(pos)+24.0*time, 30.0) < 3.0) {
-            a *= 2.0;
-            acc2 += a;
-        }
-        acc += a;
-        t += dist * 0.5;
+    float speed=time*0.5;
+    float ground_x=1.5*cos(PI*speed*0.125);
+    float ground_y=4.0-3.0*sin(PI*speed*0.125)+0.125*value;
+    float ground_z=-1.0-speed;
+    vec2 position=fragCoord.xy;
+    vec2 p=-1.0+2.0*position;
+    vec3 dir=normalize(vec3(p*vec2(1.625,1.0),0.75));	// screen ratio (x,y) fov (z)
+    dir.yz=rotate(dir.yz,PI*0.25*sin(PI*speed*0.125)-value*0.25);	// rotation x
+    dir.zx=rotate(dir.zx,PI*cos(-PI*speed*0.05));		// rotation y
+    dir.xy=rotate(dir.xy,PI*0.125*cos(PI*speed*0.125));	// rotation z
+    vec3 ray=vec3(ground_x,ground_y,ground_z);
+    float t=0.0;
+    const int ray_n=96;
+    for(int i=0;i<ray_n;i++) {
+        float k=scene1(ray+dir*t);
+        if(abs(k)<0.005) break;
+        t+=k*0.5;
     }
-
-    vec3 col = vec3(acc * 0.001, acc * 0.001 + acc2*0.002, acc * 0.002+ acc2*0.005);
-    gl_FragColor = vec4(col, 1.0 - t * 0.03);
+    vec3 hit=ray+dir*t;
+    vec2 h=vec2(-0.02,0.01); // light
+    vec3 n=normalize(vec3(scene1(hit+h.xyy),scene1(hit+h.yxx),scene1(hit+h.yyx)));
+    float c=(n.x+n.y+n.z)*0.1;
+    vec3 color=vec3(c,c,c)-t*0.0625;
+    //color*=0.6+0.4*rand(vec2(t,t),iTime); // noise!
+    gl_FragColor=vec4(vec3(c+t*0.08,c+t*0.02,c*1.5-t*0.01)+color*color,1.0);
 }
diff --git a/scripts/wlbg/src/options.zig b/scripts/wlbg/src/options.zig
index 47414ac..9cbbafd 100644
--- a/scripts/wlbg/src/options.zig
+++ b/scripts/wlbg/src/options.zig
@@ -4,7 +4,7 @@ const std = @import("std");
 pub const fps = 30;
 
 // Draw backgrounds aligned with same value or individually with different val.
-pub const multihead_mode: enum { combined, individual } = .combined;
+pub const multihead_mode: enum { combined, individual } = .individual;
 
 // Time between background changes
 pub const refresh_time = std.time.ms_per_min * 5;