Remove voxel_descent shader, add cube_lines shader, update README

- Removed voxel_descent.frag.glsl (incompatible with OpenGL - multiple overflow issues)
- Added cube_lines.frag.glsl by Danil (raytraced refraction cube with self-intersections)
- Updated README.md:
  - Corrected executable name (shadertoy_sdl3 → shadertoy)
  - Added features section (FPS counter, VSync, metadata, feedback system)
  - Updated keyboard shortcuts (F3, F4, arrows)
  - Added Shadertoy compatibility guide
  - Updated usage examples with correct paths
  - Added shader conversion guide from Shadertoy

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Makefile

@@ -35,10 +35,11 @@ LINUX_RELEASE               := $(TARGET_NAME)-$(VERSION)-linux.tar.gz
 # Lista completa de archivos fuente
 APP_SOURCES := \
     src/main.cpp \
-    third_party/glad/src/glad.c
+    third_party/glad/src/glad.c \
+    third_party/jail_audio.cpp
 
 # Includes
-INCLUDES := -Isrc -Ithird_party/glad/include
+INCLUDES := -Isrc -Ithird_party/glad/include -Ithird_party
 
 # Variables según el sistema operativo
 ifeq ($(OS),Windows_NT)
@@ -94,6 +95,7 @@ windows_release:
 
 # Copia la carpeta 'shaders'
 	powershell Copy-Item -Path "shaders" -Destination "$(RELEASE_FOLDER)" -recurse -Force
+	powershell Copy-Item -Path "data" -Destination "$(RELEASE_FOLDER)" -recurse -Force
 
 # Copia los ficheros que están en la raíz del proyecto
 	powershell Copy-Item "LICENSE" -Destination "$(RELEASE_FOLDER)"
@@ -141,6 +143,7 @@ macos_release:
 
 # Copia carpetas y ficheros
 	cp -R shaders "$(RELEASE_FOLDER)/$(APP_NAME).app/Contents/Resources"
+	cp -R data "$(RELEASE_FOLDER)/$(APP_NAME).app/Contents/Resources"
 	cp -R release/frameworks/SDL3.xcframework "$(RELEASE_FOLDER)/$(APP_NAME).app/Contents/Frameworks"
 	cp release/icon.icns "$(RELEASE_FOLDER)/$(APP_NAME).app/Contents/Resources"
 	cp release/Info.plist "$(RELEASE_FOLDER)/$(APP_NAME).app/Contents"
@@ -192,6 +195,7 @@ linux_release:
 
 # Copia ficheros
 	cp -R shaders "$(RELEASE_FOLDER)"
+	cp -R data "$(RELEASE_FOLDER)"
 	cp LICENSE "$(RELEASE_FOLDER)"
 	cp README.md "$(RELEASE_FOLDER)"
 

README.md

@@ -11,17 +11,27 @@ Proyecto minimal para ejecutar fragment shaders tipo Shadertoy usando SDL3 + GLA
 
 
 
+## Características
+
+- **Visualizador de shaders fragment** compatible con formato Shadertoy
+- **Contador de FPS** en barra de título
+- **Toggle VSync** con tecla F4
+- **Cambio de shaders en runtime** con flechas ←/→
+- **Sistema de metadata** en shaders (Name/Author automático en título)
+- **Sistema de feedback** para shaders que requieren frame anterior (opcional)
+- **Soporte de audio** con jail_audio (música de fondo)
+
+
+
 ## Estructura
 
-- src/ — código fuente C++ (incluye main.cpp).
+- src/ — código fuente C++ (incluye main.cpp)
-
+- shaders/ — shaders fragment (.frag.glsl) que se cargan en runtime
-- shaders/ — shaders fragment (.frag.glsl) que se cargan en runtime.
+- data/ — recursos (música, texturas, etc.)
-
+- third_party/glad/ — glad.c + headers
-- third_party/glad/ — glad.c + headers.
+- third_party/ — jail_audio y otras dependencias
-
+- CMakeLists.txt — configuración de build
-- CMakeLists.txt — configuración de build.
+- Makefile — builds de release para Windows/macOS/Linux
-
-- .gitignore — recomendado.
 
   
 
@@ -63,55 +73,74 @@ brew install cmake sdl3
 
 ## Uso
 
-Por defecto el ejecutable carga shaders/test.frag.glsl.
+Ejecutar con un shader específico:
+
+    ./shadertoy shaders/fractal_pyramid.frag.glsl
 
 
 
-Ejecutar en ventana:
+Ejecutar en fullscreen:
 
-    ./shadertoy_sdl3 ../shaders/test.frag.glsl
+    ./shadertoy -F shaders/seascape.frag.glsl
-
+    # o
-  
+    ./shadertoy --fullscreen shaders/seascape.frag.glsl
-
-Ejecutar en fullscreen nativo:
-
-    ./shadertoy_sdl3 -F ../shaders/test.frag.glsl
 
 
 
 Si ejecutas desde la raíz del repo:
 
-    ./build/shadertoy_sdl3 shaders/frag_tile_iter.frag.glsl
+    ./build/shadertoy shaders/water.glsl
 
 
 
-Atajos en ejecución
+### Atajos de teclado
 
-- Escape — salir.
+- **ESC** — Salir de la aplicación
-
+- **F3** — Toggle fullscreen
-- F11 — alternar fullscreen desktop.
+- **F4** — Toggle VSync (ON/OFF)
+- **← / →** — Cambiar al shader anterior/siguiente en la carpeta shaders/
 
   
 
 ## Formato de shader esperado
 
-- #version 330 core
+### Header obligatorio:
+```glsl
+// Name: Nombre del shader
+// Author: Autor
+#version 330 core
+precision highp float;
 
-- Debe declarar:
+out vec4 FragColor;
+in vec2 vUV;
+uniform vec2 iResolution;
+uniform float iTime;
+```
 
-      uniform vec2 iResolution;
+### Función mainImage (estilo Shadertoy):
+```glsl
+void mainImage(out vec4 fragColor, in vec2 fragCoord) {
+    // Tu código aquí
+    // fragCoord está en píxeles
+    vec2 uv = fragCoord / iResolution.xy;
+    fragColor = vec4(uv, 0.5, 1.0);
+}
+```
 
-      uniform float iTime;
+### Wrapper main():
+```glsl
+void main() {
+    vec2 fragCoordPixels = vUV * iResolution;
+    vec4 outColor;
+    mainImage(outColor, fragCoordPixels);
+    FragColor = outColor;
+}
+```
 
-      in vec2 vUV;
+### Metadata opcional:
-
+- `// Name: Nombre` - Aparece en barra de título
-      out vec4 FragColor;
+- `// Author: Autor` - Aparece en barra de título
-
+- `// iChannel3: self` - Habilita feedback (frame anterior)
-- Función de entrada esperada (opcional, el main llama a mainImage):
-
-      void mainImage(out vec4 fragColor, in vec2 fragCoord);
-
-- main() debe convertir vUV a fragCoord y llamar a mainImage.
 
   
 
@@ -133,15 +162,33 @@ Si obtienes "Failed to load fragment shader file", ejecuta desde la carpeta buil
 
   
 
-## Multi-pass / Buffers (nota)
+## Compatibilidad con Shadertoy
 
-Ejemplo actual es single-pass. Para portar Shadertoy con BufferA/B/C necesitas:
+### Características soportadas:
+✅ `iTime` - Tiempo en segundos
+✅ `iResolution` - Resolución de ventana (vec2)
+✅ `mainImage()` - Función de entrada estándar
+✅ Self-feedback - Frame anterior con `// iChannel3: self`
 
-- crear FBOs y textures por buffer
+### No soportado actualmente:
+❌ `iMouse` - Interacción con ratón
+❌ `iChannel0-2` - Texturas externas
+❌ Multi-pass completo (BufferA/B/C/D)
+❌ `iFrame`, `iTimeDelta`, `iDate`
 
-- renderizar buffers en orden y pasar las texturas como iChannelN a pases posteriores
+### Diferencias importantes:
+- **`iResolution`**: En Shadertoy es `vec3(width, height, width/height)`, aquí es `vec2(width, height)`
+  - Solución: `vec3 r = vec3(iResolution.xy, iResolution.x/iResolution.y);`
+- **Inicialización de variables**: OpenGL nativo requiere inicializar variables explícitamente
+- **División por valores pequeños**: Puede causar overflow - usar `max(divisor, epsilon)`
 
-- evitar leer y escribir la misma textura (usar ping-pong si hace falta)
+### Conversión de shaders de Shadertoy:
+1. Copiar función `mainImage()` tal cual
+2. Añadir header estándar (ver arriba)
+3. Añadir wrapper `main()`
+4. Eliminar referencias a `iChannel0-3` si no se usan
+5. Adaptar `iResolution` de vec3 a vec2 si es necesario
+6. Inicializar variables: `vec3 col = vec3(0.0);` en lugar de `vec3 col;`
 
   
 

shaders/cube_lines.frag.glsl

@@ -0,0 +1,778 @@
+// Name: Cube lines
+// Author: Danil
+// URL: https://www.shadertoy.com/view/NslGRN
+#version 330 core
+precision highp float;
+
+out vec4 FragColor;
+in vec2 vUV;
+uniform vec2 iResolution;
+uniform float iTime;
+
+// Note: Original shader uses iChannel0 for background blending (optional feature)
+// Since we don't support texture channels, that line is commented out
+// The shader works perfectly without it in default mode
+
+// Created by Danil (2021+) https://cohost.org/arugl
+// License Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
+// self https://www.shadertoy.com/view/NslGRN
+
+
+// --defines for "DESKTOP WALLPAPERS" that use this shader--
+// comment or uncomment every define to make it work (add or remove "//" before #define)
+
+
+// this shadertoy use ALPHA, NO_ALPHA set alpha to 1, BG_ALPHA set background as alpha
+// iChannel0 used as background if alpha ignored by wallpaper-app
+//#define NO_ALPHA
+//#define BG_ALPHA
+//#define SHADOW_ALPHA
+//#define ONLY_BOX
+
+
+// save PERFORMANCE by disabling shadow
+//#define NO_SHADOW
+
+
+// static CAMERA position, 0.49 on top, 0.001 horizontal
+//#define CAMERA_POS 0.049
+
+
+// speed of ROTATION
+#define ROTATION_SPEED 0.8999
+
+
+// static SHAPE form, default 0.5
+//#define STATIC_SHAPE 0.15
+
+
+// static SCALE far/close to camera, 2.0 is default, exampe 0.5 or 10.0
+//#define CAMERA_FAR 0.1
+
+
+// ANIMATION shape change
+//#define ANIM_SHAPE
+
+
+// ANIMATION color change
+//#define ANIM_COLOR
+
+
+// custom COLOR, and change those const values
+//#define USE_COLOR
+const vec3 color_blue=vec3(0.5,0.65,0.8);
+const vec3 color_red=vec3(0.99,0.2,0.1);
+
+
+// use 4xAA for cube only (set 2-4-etc level of AA)
+//#define AA_CUBE 4
+
+// use 4xAA for everything - derivative filtering will not be used, look fcos2
+// this is very slow - DO NOT USE
+//#define AA_ALL 4
+
+
+
+// --shader code--
+
+// Layers sorted and support transparency and self-intersection-transparency
+// Antialiasing is only dFd. (with some dFd fixes around edges)
+
+// using iq's intersectors: https://iquilezles.org/articles/intersectors
+// using https://www.shadertoy.com/view/ltKBzG
+// using https://www.shadertoy.com/view/tsVXzh
+// using https://www.shadertoy.com/view/WlffDn
+// using https://www.shadertoy.com/view/WslGz4
+
+#define tshift 53.
+
+// reflect back side
+//#define backside_refl
+
+// Camera with mouse
+// #define MOUSE_control (disabled - no iMouse support)
+
+// min(iFrame,0) does not speedup compilation in ANGLE
+#define ANGLE_loops 0
+
+
+// this shader discover Nvidia bug with arrays https://www.shadertoy.com/view/NslGR4
+// use DEBUG with BUG, BUG trigger that bug and one layer will be white on Nvidia in OpenGL
+//#define DEBUG
+//#define BUG
+
+#define FDIST 0.7
+#define PI 3.1415926
+#define GROUNDSPACING 0.5
+#define GROUNDGRID 0.05
+#define BOXDIMS vec3(0.75, 0.75, 1.25)
+
+#define IOR 1.33
+
+mat3 rotx(float a){float s = sin(a);float c = cos(a);return mat3(vec3(1.0, 0.0, 0.0), vec3(0.0, c, s), vec3(0.0, -s, c));  }
+mat3 roty(float a){float s = sin(a);float c = cos(a);return mat3(vec3(c, 0.0, s), vec3(0.0, 1.0, 0.0), vec3(-s, 0.0, c));}
+mat3 rotz(float a){float s = sin(a);float c = cos(a);return mat3(vec3(c, s, 0.0), vec3(-s, c, 0.0), vec3(0.0, 0.0, 1.0 ));}
+
+vec3 fcos1(vec3 x) {
+    vec3 w = fwidth(x);
+    //if((length(w)==0.))return vec3(0.); // dFd fix2
+    //w*=0.; //test
+    float lw=length(w);
+    if((lw==0.)||isnan(lw)||isinf(lw)){vec3 tc=vec3(0.); for(int i=0;i<8;i++)tc+=cos(x+x*float(i-4)*(0.01*400./iResolution.y));return tc/8.;}
+
+    return cos(x) * smoothstep(3.14 * 2.0, 0.0, w);
+}
+
+vec3 fcos2( vec3 x){return cos(x);}
+vec3 fcos( vec3 x){
+#ifdef AA_ALL
+    return fcos2(x);
+#else
+    return fcos1(x);
+#endif
+}
+
+vec3 getColor(vec3 p)
+{
+    // dFd fix, dFd broken on borders, but it fix only top level dFd, self intersection has border
+    //if (length(p) > 0.99)return vec3(0.);
+    p = abs(p);
+
+    p *= 01.25;
+    p = 0.5 * p / dot(p, p);
+#ifdef ANIM_COLOR
+    p+=0.072*iTime;
+#endif
+
+    float t = (0.13) * length(p);
+    vec3 col = vec3(0.3, 0.4, 0.5);
+    col += 0.12 * fcos(6.28318 * t * 1.0 + vec3(0.0, 0.8, 1.1));
+    col += 0.11 * fcos(6.28318 * t * 3.1 + vec3(0.3, 0.4, 0.1));
+    col += 0.10 * fcos(6.28318 * t * 5.1 + vec3(0.1, 0.7, 1.1));
+    col += 0.10 * fcos(6.28318 * t * 17.1 + vec3(0.2, 0.6, 0.7));
+    col += 0.10 * fcos(6.28318 * t * 31.1 + vec3(0.1, 0.6, 0.7));
+    col += 0.10 * fcos(6.28318 * t * 65.1 + vec3(0.0, 0.5, 0.8));
+    col += 0.10 * fcos(6.28318 * t * 115.1 + vec3(0.1, 0.4, 0.7));
+    col += 0.10 * fcos(6.28318 * t * 265.1 + vec3(1.1, 1.4, 2.7));
+    col = clamp(col, 0., 1.);
+
+    return col;
+}
+
+void calcColor(vec3 ro, vec3 rd, vec3 nor, float d, float len, int idx, bool si, float td, out vec4 colx,
+               out vec4 colsi)
+{
+
+    vec3 pos = (ro + rd * d);
+#ifdef DEBUG
+    float a = 1. - smoothstep(len - 0.15, len + 0.00001, length(pos));
+    if (idx == 0)colx = vec4(1., 0., 0., a);
+    if (idx == 1)colx = vec4(0., 1., 0., a);
+    if (idx == 2)colx = vec4(0., 0., 1., a);
+    if (si)
+    {
+        pos = (ro + rd * td);
+        float ta = 1. - smoothstep(len - 0.15, len + 0.00001, length(pos));
+        if (idx == 0)colsi = vec4(1., 0., 0., ta);
+        if (idx == 1)colsi = vec4(0., 1., 0., ta);
+        if (idx == 2)colsi = vec4(0., 0., 1., ta);
+    }
+#else
+    float a = 1. - smoothstep(len - 0.15*0.5, len + 0.00001, length(pos));
+    //a=1.;
+    vec3 col = getColor(pos);
+    colx = vec4(col, a);
+    if (si)
+    {
+        pos = (ro + rd * td);
+        float ta = 1. - smoothstep(len - 0.15*0.5, len + 0.00001, length(pos));
+        //ta=1.;
+        col = getColor(pos);
+        colsi = vec4(col, ta);
+    }
+#endif
+}
+
+// xSI is self intersect data, fade to fix dFd on edges
+bool iBilinearPatch(in vec3 ro, in vec3 rd, in vec4 ps, in vec4 ph, in float sz, out float t, out vec3 norm,
+                    out bool si, out float tsi, out vec3 normsi, out float fade, out float fadesi)
+{
+    vec3 va = vec3(0.0, 0.0, ph.x + ph.w - ph.y - ph.z);
+    vec3 vb = vec3(0.0, ps.w - ps.y, ph.z - ph.x);
+    vec3 vc = vec3(ps.z - ps.x, 0.0, ph.y - ph.x);
+    vec3 vd = vec3(ps.xy, ph.x);
+    t = -1.;
+    tsi = -1.;
+    si = false;
+    fade = 1.;
+    fadesi = 1.;
+    norm=vec3(0.,1.,0.);normsi=vec3(0.,1.,0.);
+
+    float tmp = 1.0 / (vb.y * vc.x);
+    float a = 0.0;
+    float b = 0.0;
+    float c = 0.0;
+    float d = va.z * tmp;
+    float e = 0.0;
+    float f = 0.0;
+    float g = (vc.z * vb.y - vd.y * va.z) * tmp;
+    float h = (vb.z * vc.x - va.z * vd.x) * tmp;
+    float i = -1.0;
+    float j = (vd.x * vd.y * va.z + vd.z * vb.y * vc.x) * tmp - (vd.y * vb.z * vc.x + vd.x * vc.z * vb.y) * tmp;
+
+    float p = dot(vec3(a, b, c), rd.xzy * rd.xzy) + dot(vec3(d, e, f), rd.xzy * rd.zyx);
+    float q = dot(vec3(2.0, 2.0, 2.0) * ro.xzy * rd.xyz, vec3(a, b, c)) + dot(ro.xzz * rd.zxy, vec3(d, d, e)) +
+              dot(ro.yyx * rd.zxy, vec3(e, f, f)) + dot(vec3(g, h, i), rd.xzy);
+    float r =
+        dot(vec3(a, b, c), ro.xzy * ro.xzy) + dot(vec3(d, e, f), ro.xzy * ro.zyx) + dot(vec3(g, h, i), ro.xzy) + j;
+
+    if (abs(p) < 0.000001)
+    {
+        float tt = -r / q;
+        if (tt <= 0.)
+            return false;
+        t = tt;
+        // normal
+
+        vec3 pos = ro + t * rd;
+        if(length(pos)>sz)return false;
+        vec3 grad =
+            vec3(2.0) * pos.xzy * vec3(a, b, c) + pos.zxz * vec3(d, d, e) + pos.yyx * vec3(f, e, f) + vec3(g, h, i);
+        norm = -normalize(grad);
+        return true;
+    }
+    else
+    {
+        float sq = q * q - 4.0 * p * r;
+        if (sq < 0.0)
+        {
+            return false;
+        }
+        else
+        {
+            float s = sqrt(sq);
+            float t0 = (-q + s) / (2.0 * p);
+            float t1 = (-q - s) / (2.0 * p);
+            float tt1 = min(t0 < 0.0 ? t1 : t0, t1 < 0.0 ? t0 : t1);
+            float tt2 = max(t0 > 0.0 ? t1 : t0, t1 > 0.0 ? t0 : t1);
+            float tt0 = tt1;
+            if (tt0 <= 0.)
+                return false;
+            vec3 pos = ro + tt0 * rd;
+            // black border on end of circle and self intersection with alpha come because dFd
+            // uncomment this to see or rename fcos2 to fcos
+            //sz+=0.3;
+            bool ru = step(sz, length(pos)) > 0.5;
+            if (ru)
+            {
+                tt0 = tt2;
+                pos = ro + tt0 * rd;
+            }
+            if (tt0 <= 0.)
+                return false;
+            bool ru2 = step(sz, length(pos)) > 0.5;
+            if (ru2)
+                return false;
+
+            // self intersect
+            if ((tt2 > 0.) && ((!ru)) && !(step(sz, length(ro + tt2 * rd)) > 0.5))
+            {
+                si = true;
+                fadesi=s;
+                tsi = tt2;
+                vec3 tpos = ro + tsi * rd;
+                // normal
+                vec3 tgrad = vec3(2.0) * tpos.xzy * vec3(a, b, c) + tpos.zxz * vec3(d, d, e) +
+                             tpos.yyx * vec3(f, e, f) + vec3(g, h, i);
+                normsi = -normalize(tgrad);
+            }
+
+            fade=s;
+            t = tt0;
+            // normal
+            vec3 grad =
+                vec3(2.0) * pos.xzy * vec3(a, b, c) + pos.zxz * vec3(d, d, e) + pos.yyx * vec3(f, e, f) + vec3(g, h, i);
+            norm = -normalize(grad);
+
+            return true;
+        }
+    }
+}
+
+float dot2( in vec3 v ) { return dot(v,v); }
+
+float segShadow( in vec3 ro, in vec3 rd, in vec3 pa, float sh )
+{
+    float dm = dot(rd.yz,rd.yz);
+    float k1 = (ro.x-pa.x)*dm;
+    float k2 = (ro.x+pa.x)*dm;
+    vec2  k5 = (ro.yz+pa.yz)*dm;
+    float k3 = dot(ro.yz+pa.yz,rd.yz);
+    vec2  k4 = (pa.yz+pa.yz)*rd.yz;
+    vec2  k6 = (pa.yz+pa.yz)*dm;
+
+    for( int i=0; i<4 + ANGLE_loops; i++ )
+    {
+        vec2  s = vec2(i&1,i>>1);
+        float t = dot(s,k4) - k3;
+
+        if( t>0.0 )
+        sh = min(sh,dot2(vec3(clamp(-rd.x*t,k1,k2),k5-k6*s)+rd*t)/(t*t));
+    }
+    return sh;
+}
+
+float boxSoftShadow( in vec3 ro, in vec3 rd, in vec3 rad, in float sk )
+{
+    rd += 0.0001 * (1.0 - abs(sign(rd)));
+    vec3 rdd = rd;
+    vec3 roo = ro;
+
+    vec3 m = 1.0/rdd;
+    vec3 n = m*roo;
+    vec3 k = abs(m)*rad;
+
+    vec3 t1 = -n - k;
+    vec3 t2 = -n + k;
+
+    float tN = max( max( t1.x, t1.y ), t1.z );
+    float tF = min( min( t2.x, t2.y ), t2.z );
+
+    if( tN<tF && tF>0.0) return 0.0;
+
+    float sh = 1.0;
+    sh = segShadow( roo.xyz, rdd.xyz, rad.xyz, sh );
+    sh = segShadow( roo.yzx, rdd.yzx, rad.yzx, sh );
+    sh = segShadow( roo.zxy, rdd.zxy, rad.zxy, sh );
+    sh = clamp(sk*sqrt(sh),0.0,1.0);
+    return sh*sh*(3.0-2.0*sh);
+}
+
+float box(in vec3 ro, in vec3 rd, in vec3 r, out vec3 nn, bool entering)
+{
+    rd += 0.0001 * (1.0 - abs(sign(rd)));
+    vec3 dr = 1.0 / rd;
+    vec3 n = ro * dr;
+    vec3 k = r * abs(dr);
+
+    vec3 pin = -k - n;
+    vec3 pout = k - n;
+    float tin = max(pin.x, max(pin.y, pin.z));
+    float tout = min(pout.x, min(pout.y, pout.z));
+    if (tin > tout)
+        return -1.;
+    if (entering)
+    {
+        nn = -sign(rd) * step(pin.zxy, pin.xyz) * step(pin.yzx, pin.xyz);
+    }
+    else
+    {
+        nn = sign(rd) * step(pout.xyz, pout.zxy) * step(pout.xyz, pout.yzx);
+    }
+    return entering ? tin : tout;
+}
+
+vec3 bgcol(in vec3 rd)
+{
+    return mix(vec3(0.01), vec3(0.336, 0.458, .668), 1. - pow(abs(rd.z+0.25), 1.3));
+}
+
+vec3 background(in vec3 ro, in vec3 rd , vec3 l_dir, out float alpha)
+{
+#ifdef ONLY_BOX
+alpha=0.;
+return vec3(0.01);
+#endif
+    float t = (-BOXDIMS.z - ro.z) / rd.z;
+    alpha=0.;
+    vec3 bgc = bgcol(rd);
+    if (t < 0.)
+        return bgc;
+    vec2 uv = ro.xy + t * rd.xy;
+#ifdef NO_SHADOW
+    float shad=1.;
+#else
+    float shad = boxSoftShadow((ro + t * rd), normalize(l_dir+vec3(0.,0.,1.))*rotz(PI*0.65) , BOXDIMS, 1.5);
+#endif
+    float aofac = smoothstep(-0.95, .75, length(abs(uv) - min(abs(uv), vec2(0.45))));
+    aofac = min(aofac,smoothstep(-0.65, 1., shad));
+    float lght=max(dot(normalize(ro + t * rd+vec3(0.,-0.,-5.)), normalize(l_dir-vec3(0.,0.,1.))*rotz(PI*0.65)), 0.0);
+    vec3 col = mix(vec3(0.4), vec3(.71,.772,0.895), lght*lght* aofac+ 0.05) * aofac;
+    alpha=1.-smoothstep(7.,10.,length(uv));
+#ifdef SHADOW_ALPHA
+    //alpha=clamp(alpha*max(lght*lght*0.95,(1.-aofac)*1.25),0.,1.);
+    alpha=clamp(alpha*(1.-aofac)*1.25,0.,1.);
+#endif
+    return mix(col*length(col)*0.8,bgc,smoothstep(7.,10.,length(uv)));
+}
+
+#define swap(a,b) tv=a;a=b;b=tv
+
+vec4 insides(vec3 ro, vec3 rd, vec3 nor_c, vec3 l_dir, out float tout)
+{
+    tout = -1.;
+    vec3 trd=rd;
+
+    vec3 col = vec3(0.);
+
+    float pi = 3.1415926;
+
+    if (abs(nor_c.x) > 0.5)
+    {
+        rd = rd.xzy * nor_c.x;
+        ro = ro.xzy * nor_c.x;
+    }
+    else if (abs(nor_c.z) > 0.5)
+    {
+        l_dir *= roty(pi);
+        rd = rd.yxz * nor_c.z;
+        ro = ro.yxz * nor_c.z;
+    }
+    else if (abs(nor_c.y) > 0.5)
+    {
+        l_dir *= rotz(-pi * 0.5);
+        rd = rd * nor_c.y;
+        ro = ro * nor_c.y;
+    }
+
+#ifdef ANIM_SHAPE
+    float curvature = (0.001+1.5-1.5*smoothstep(0.,8.5,mod((iTime+tshift)*0.44,20.))*(1.-smoothstep(10.,18.5,mod((iTime+tshift)*0.44,20.))));
+    // curvature(to not const above) make compilation on Angle 15+ sec
+#else
+#ifdef STATIC_SHAPE
+    const float curvature = STATIC_SHAPE;
+#else
+    const float curvature = .5;
+#endif
+#endif
+    float bil_size = 1.;
+    vec4 ps = vec4(-bil_size, -bil_size, bil_size, bil_size) * curvature;
+    vec4 ph = vec4(-bil_size, bil_size, bil_size, -bil_size) * curvature;
+
+    vec4 [3]colx=vec4[3](vec4(0.),vec4(0.),vec4(0.));
+    vec3 [3]dx=vec3[3](vec3(-1.),vec3(-1.),vec3(-1.));
+    vec4 [3]colxsi=vec4[3](vec4(0.),vec4(0.),vec4(0.));
+    int [3]order=int[3](0,1,2);
+
+    for (int i = 0; i < 3 + ANGLE_loops; i++)
+    {
+        if (abs(nor_c.x) > 0.5)
+        {
+            ro *= rotz(-pi * (1. / float(3)));
+            rd *= rotz(-pi * (1. / float(3)));
+        }
+        else if (abs(nor_c.z) > 0.5)
+        {
+            ro *= rotz(pi * (1. / float(3)));
+            rd *= rotz(pi * (1. / float(3)));
+        }
+        else if (abs(nor_c.y) > 0.5)
+        {
+            ro *= rotx(pi * (1. / float(3)));
+            rd *= rotx(pi * (1. / float(3)));
+        }
+        vec3 normnew;
+        float tnew;
+        bool si;
+        float tsi;
+        vec3 normsi;
+        float fade;
+        float fadesi;
+
+        if (iBilinearPatch(ro, rd, ps, ph, bil_size, tnew, normnew, si, tsi, normsi, fade, fadesi))
+        {
+            if (tnew > 0.)
+            {
+                vec4 tcol, tcolsi;
+                calcColor(ro, rd, normnew, tnew, bil_size, i, si, tsi, tcol, tcolsi);
+                if (tcol.a > 0.0)
+                {
+                    {
+                        vec3 tvalx = vec3(tnew, float(si), tsi);
+                        dx[i]=tvalx;
+                    }
+#ifdef DEBUG
+                    colx[i]=tcol;
+                    if (si)colxsi[i]=tcolsi;
+#else
+
+                    float dif = clamp(dot(normnew, l_dir), 0.0, 1.0);
+                    float amb = clamp(0.5 + 0.5 * dot(normnew, l_dir), 0.0, 1.0);
+
+                    {
+#ifdef USE_COLOR
+                        vec3 shad = 0.57 * color_blue * amb + 1.5*color_blue.bgr * dif;
+                        const vec3 tcr = color_red;
+#else
+                        vec3 shad = vec3(0.32, 0.43, 0.54) * amb + vec3(1.0, 0.9, 0.7) * dif;
+                        const vec3 tcr = vec3(1.,0.21,0.11);
+#endif
+                        float ta = clamp(length(tcol.rgb),0.,1.);
+                        tcol=clamp(tcol*tcol*2.,0.,1.);
+                        vec4 tvalx =
+                            vec4((tcol.rgb*shad*1.4 + 3.*(tcr*tcol.rgb)*clamp(1.-(amb+dif),0.,1.)), min(tcol.a,ta));
+                        tvalx.rgb=clamp(2.*tvalx.rgb*tvalx.rgb,0.,1.);
+                        tvalx*=(min(fade*5.,1.));
+                        colx[i]=tvalx;
+                    }
+                    if (si)
+                    {
+                        dif = clamp(dot(normsi, l_dir), 0.0, 1.0);
+                        amb = clamp(0.5 + 0.5 * dot(normsi, l_dir), 0.0, 1.0);
+                        {
+#ifdef USE_COLOR
+                            vec3 shad = 0.57 * color_blue * amb + 1.5*color_blue.bgr * dif;
+                            const vec3 tcr = color_red;
+#else
+                            vec3 shad = vec3(0.32, 0.43, 0.54) * amb + vec3(1.0, 0.9, 0.7) * dif;
+                            const vec3 tcr = vec3(1.,0.21,0.11);
+#endif
+                            float ta = clamp(length(tcolsi.rgb),0.,1.);
+                            tcolsi=clamp(tcolsi*tcolsi*2.,0.,1.);
+                            vec4 tvalx =
+                                vec4(tcolsi.rgb * shad + 3.*(tcr*tcolsi.rgb)*clamp(1.-(amb+dif),0.,1.), min(tcolsi.a,ta));
+                            tvalx.rgb=clamp(2.*tvalx.rgb*tvalx.rgb,0.,1.);
+                            tvalx.rgb*=(min(fadesi*5.,1.));
+                            colxsi[i]=tvalx;
+                        }
+                    }
+#endif
+                }
+            }
+        }
+    }
+    // transparency logic and layers sorting
+    float a = 1.;
+    if (dx[0].x < dx[1].x){{vec3 swap(dx[0], dx[1]);}{int swap(order[0], order[1]);}}
+    if (dx[1].x < dx[2].x){{vec3 swap(dx[1], dx[2]);}{int swap(order[1], order[2]);}}
+    if (dx[0].x < dx[1].x){{vec3 swap(dx[0], dx[1]);}{int swap(order[0], order[1]);}}
+
+    tout = max(max(dx[0].x, dx[1].x), dx[2].x);
+
+    if (dx[0].y < 0.5)
+    {
+        a=colx[order[0]].a;
+    }
+
+#if !(defined(DEBUG)&&defined(BUG))
+
+    // self intersection
+    bool [3] rul= bool[3](
+        ((dx[0].y > 0.5) && (dx[1].x <= 0.)),
+        ((dx[1].y > 0.5) && (dx[0].x > dx[1].z)),
+        ((dx[2].y > 0.5) && (dx[1].x > dx[2].z))
+    );
+    for(int k=0;k<3;k++){
+        if(rul[k]){
+            vec4 tcolxsi = vec4(0.);
+            tcolxsi=colxsi[order[k]];
+            vec4 tcolx = vec4(0.);
+            tcolx=colx[order[k]];
+
+            vec4 tvalx = mix(tcolxsi, tcolx, tcolx.a);
+            colx[order[k]]=tvalx;
+
+            vec4 tvalx2 = mix(vec4(0.), tvalx, max(tcolx.a, tcolxsi.a));
+            colx[order[k]]=tvalx2;
+        }
+    }
+
+#endif
+
+    float a1 = (dx[1].y < 0.5) ? colx[order[1]].a : ((dx[1].z > dx[0].x) ? colx[order[1]].a : 1.);
+    float a2 = (dx[2].y < 0.5) ? colx[order[2]].a : ((dx[2].z > dx[1].x) ? colx[order[2]].a : 1.);
+    col = mix(mix(colx[order[0]].rgb, colx[order[1]].rgb, a1), colx[order[2]].rgb, a2);
+    a = max(max(a, a1), a2);
+    return vec4(col, a);
+}
+
+void mainImage(out vec4 fragColor, in vec2 fragCoord)
+{
+    float osc = 0.5;
+    vec3 l_dir = normalize(vec3(0., 1., 0.));
+    l_dir *= rotz(0.5);
+    float mouseY = 1.0 * 0.5 * PI;
+    // Note: MOUSE_control disabled (no iMouse support)
+    // #ifdef MOUSE_control
+    // mouseY = (1.0 - 1.15 * iMouse.y / iResolution.y) * 0.5 * PI;
+    // if(iMouse.y < 1.)
+    // #endif
+#ifdef CAMERA_POS
+    mouseY = PI*CAMERA_POS;
+#else
+    mouseY = PI*0.49 - smoothstep(0.,8.5,mod((iTime+tshift)*0.33,25.))*(1.-smoothstep(14.,24.0,mod((iTime+tshift)*0.33,25.))) * 0.55 * PI;
+#endif
+#ifdef ROTATION_SPEED
+    float mouseX = -2.*PI-0.25*(iTime*ROTATION_SPEED+tshift);
+#else
+    float mouseX = -2.*PI-0.25*(iTime+tshift);
+#endif
+    // Note: MOUSE_control disabled (no iMouse support)
+    // #ifdef MOUSE_control
+    // mouseX+=-(iMouse.x / iResolution.x) * 2. * PI;
+    // #endif
+
+#ifdef CAMERA_FAR
+    vec3 eye = (2. + CAMERA_FAR) * vec3(cos(mouseX) * cos(mouseY), sin(mouseX) * cos(mouseY), sin(mouseY));
+#else
+    vec3 eye = 4. * vec3(cos(mouseX) * cos(mouseY), sin(mouseX) * cos(mouseY), sin(mouseY));
+#endif
+    vec3 w = normalize(-eye);
+    vec3 up = vec3(0., 0., 1.);
+    vec3 u = normalize(cross(w, up));
+    vec3 v = cross(u, w);
+
+    vec4 tot=vec4(0.);
+#if defined(AA_CUBE)||defined(AA_ALL)
+#ifdef AA_CUBE
+    const int AA = AA_CUBE;
+#else
+    const int AA = AA_ALL;
+#endif
+    vec3 incol_once=vec3(0.);
+    bool in_once=false;
+    vec4 incolbg_once=vec4(0.);
+    bool bg_in_once=false;
+    vec4 outcolbg_once=vec4(0.);
+    bool bg_out_once=false;
+    for( int mx=0; mx<AA; mx++ )
+    for( int nx=0; nx<AA; nx++ )
+    {
+    vec2 o = vec2(mod(float(mx+AA/2),float(AA)),mod(float(nx+AA/2),float(AA))) / float(AA) - 0.5;
+    vec2 uv = (fragCoord + o - 0.5 * iResolution.xy) / iResolution.x;
+#else
+    vec2 uv = (fragCoord - 0.5 * iResolution.xy) / iResolution.x;
+#endif
+    vec3 rd = normalize(w * FDIST + uv.x * u + uv.y * v);
+
+    vec3 ni;
+    float t = box(eye, rd, BOXDIMS, ni, true);
+    vec3 ro = eye + t * rd;
+    vec2 coords = ro.xy * ni.z/BOXDIMS.xy + ro.yz * ni.x/BOXDIMS.yz + ro.zx * ni.y/BOXDIMS.zx;
+    float fadeborders = (1.-smoothstep(0.915,1.05,abs(coords.x)))*(1.-smoothstep(0.915,1.05,abs(coords.y)));
+
+    if (t > 0.)
+    {
+        float ang = -iTime * 0.33;
+        vec3 col = vec3(0.);
+#ifdef AA_CUBE
+        if(in_once)col=incol_once;
+        else{
+        in_once=true;
+#endif
+        float R0 = (IOR - 1.) / (IOR + 1.);
+        R0 *= R0;
+
+        vec2 theta = vec2(0.);
+        vec3 n = vec3(cos(theta.x) * sin(theta.y), sin(theta.x) * sin(theta.y), cos(theta.y));
+
+        vec3 nr = n.zxy * ni.x + n.yzx * ni.y + n.xyz * ni.z;
+        vec3 rdr = reflect(rd, nr);
+        float talpha;
+        vec3 reflcol = background(ro, rdr, l_dir,talpha);
+
+        vec3 rd2 = refract(rd, nr, 1. / IOR);
+
+        float accum = 1.;
+        vec3 no2 = ni;
+        vec3 ro_refr = ro;
+
+        vec4 [2] colo = vec4[2](vec4(0.),vec4(0.));
+
+        for (int j = 0; j < 2 + ANGLE_loops; j++)
+        {
+            float tb;
+            vec2 coords2 = ro_refr.xy * no2.z + ro_refr.yz * no2.x + ro_refr.zx * no2.y;
+            vec3 eye2 = vec3(coords2, -1.);
+            vec3 rd2trans = rd2.yzx * no2.x + rd2.zxy * no2.y + rd2.xyz * no2.z;
+
+            rd2trans.z = -rd2trans.z;
+            vec4 internalcol = insides(eye2, rd2trans, no2, l_dir, tb);
+            if (tb > 0.)
+            {
+                internalcol.rgb *= accum;
+                colo[j]=internalcol;
+            }
+
+            if ((tb <= 0.) || (internalcol.a < 1.))
+            {
+                float tout = box(ro_refr, rd2, BOXDIMS, no2, false);
+                no2 = n.zyx * no2.x + n.xzy * no2.y + n.yxz * no2.z;
+                vec3 rout = ro_refr + tout * rd2;
+                vec3 rdout = refract(rd2, -no2, IOR);
+                float fresnel2 = R0 + (1. - R0) * pow(1. - dot(rdout, no2), 1.3);
+                rd2 = reflect(rd2, -no2);
+
+#ifdef backside_refl
+                if((dot(rdout, no2))>0.5){fresnel2=1.;}
+#endif
+                ro_refr = rout;
+                ro_refr.z = max(ro_refr.z, -0.999);
+
+                accum *= fresnel2;
+            }
+        }
+        float fresnel = R0 + (1. - R0) * pow(1. - dot(-rd, nr), 5.);
+        col = mix(mix(colo[1].rgb * colo[1].a, colo[0].rgb, colo[0].a)*fadeborders, reflcol, pow(fresnel, 1.5));
+        col=clamp(col,0.,1.);
+#ifdef AA_CUBE
+        }
+        incol_once=col;
+        if(!bg_in_once){
+        bg_in_once=true;
+        float alpha;
+        incolbg_once = vec4(background(eye, rd, l_dir, alpha), 0.15);
+#if defined(BG_ALPHA)||defined(ONLY_BOX)||defined(SHADOW_ALPHA)
+        incolbg_once.w = alpha;
+#endif
+        }
+#endif
+
+        float cineshader_alpha = 0.;
+        cineshader_alpha = clamp(0.15*dot(eye,ro),0.,1.);
+        vec4 tcolx = vec4(col, cineshader_alpha);
+#if defined(BG_ALPHA)||defined(ONLY_BOX)||defined(SHADOW_ALPHA)
+        tcolx.w = 1.;
+#endif
+        tot += tcolx;
+    }
+    else
+    {
+        vec4 tcolx = vec4(0.);
+#ifdef AA_CUBE
+        if(!bg_out_once){
+        bg_out_once=true;
+#endif
+        float alpha;
+        tcolx = vec4(background(eye, rd, l_dir, alpha), 0.15);
+#if defined(BG_ALPHA)||defined(ONLY_BOX)||defined(SHADOW_ALPHA)
+        tcolx.w = alpha;
+#endif
+#ifdef AA_CUBE
+        outcolbg_once=tcolx;
+        }else tcolx=max(outcolbg_once,incolbg_once);
+#endif
+        tot += tcolx;
+    }
+#if defined(AA_CUBE)||defined(AA_ALL)
+    }
+    tot /= float(AA*AA);
+#endif
+    fragColor = tot;
+#ifdef NO_ALPHA
+    fragColor.w = 1.;
+#endif
+    fragColor.rgb=clamp(fragColor.rgb,0.,1.);
+    // Note: iChannel0 line removed (texture channel not supported)
+    // Original line was for optional background blending when BG_ALPHA/ONLY_BOX/SHADOW_ALPHA defined
+    // #if defined(BG_ALPHA)||defined(ONLY_BOX)||defined(SHADOW_ALPHA)
+    // fragColor.rgb=fragColor.rgb*fragColor.w+texture(iChannel0, fragCoord/iResolution.xy).rgb*(1.-fragColor.w);
+    // #endif
+}
+
+void main() {
+    vec2 fragCoordPixels = vUV * iResolution;
+    vec4 outColor;
+    mainImage(outColor, fragCoordPixels);
+    FragColor = outColor;
+}

shaders/voxel_descent.frag.glsl

@@ -1,52 +0,0 @@
-// Name: Voxel Descent
-// Author: Jaenman
-// URL: https://www.shadertoy.com/view/Wc3cRr
-#version 330 core
-precision highp float;
-
-out vec4 FragColor;
-in vec2 vUV;
-uniform vec2 iResolution;
-uniform float iTime;
-
-/*================================
-=         Voxel Descent          =
-=         Author: Jaenam         =
-================================*/
-// Date:    2025-11-14
-// License: Creative Commons (CC BY-NC-SA 4.0)
-
-// Thanks to @diatribes for the plasma :D
-
-void mainImage( out vec4 O, vec2 I )
-{
-    float i=0.,d=0.,s=0.,t = iTime*.8;
-    vec3 p,q,z,k;
-    vec4 c = vec4(1,2,3,1);
-    mat2 R = mat2(cos(t/3.+vec4(0,33,11,0)));
-
-    // Initialize O before loop (was O*=i where i=0, reading uninitialized out parameter)
-    O = vec4(0.0);
-
-    for(; i++<1e2;O+=sin(.5*c+i*.2)/s)
-
-        z = normalize(vec3(I+I, 0) - vec3(iResolution.xy, iResolution.y)),
-        z.xy*=R,
-        p = d*z+sqrt(i)*i,
-        k=z/=length(z.xy),
-        z.z-=t, p.z+=t,
-
-        d+=s=.012+.07*abs(mix(cos(dot(sin(floor(p/8.)).yzx,cos(ceil(z/.1)))),length(k),.2)-i/1e2);
-
-    O*= exp(-.02*d*d);
-    // Add epsilon protection to prevent division overflow
-    O=tanh(O*O*mix(length(abs(c/max(dot(cos(t+p),vec3(6)), 0.001))),length(k),.5)/6e4);
-
-}
-
-void main() {
-    vec2 fragCoordPixels = vUV * iResolution;
-    vec4 outColor;
-    mainImage(outColor, fragCoordPixels);
-    FragColor = outColor;
-}