Reestructura carpetes: src->source, third_party->source/external, shaders->data/shaders

data/shaders/cineshader_lava/cineshader_lava.frag.msl

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+#include <metal_stdlib>
+using namespace metal;
+
+// Cineshader Lava — edankwan
+// MSL port of cineshader_lava.vk.glsl.
+
+struct ShadertoyUBO {
+    float iTime;
+    float2 iResolution;
+};
+
+struct PassthroughVOut {
+    float4 pos [[position]];
+    float2 uv;
+};
+
+static float opSmoothUnion(float d1, float d2, float k) {
+    float h = clamp(0.5 + 0.5 * (d2 - d1) / k, 0.0, 1.0);
+    return mix(d2, d1, h) - k * h * (1.0 - h);
+}
+
+static float sdSphere(float3 p, float s) {
+    return length(p) - s;
+}
+
+static float map(float3 p, float iTime) {
+    float d = 2.0;
+    for (int i = 0; i < 16; i++) {
+        float fi = float(i);
+        float time = iTime * (fract(fi * 412.531 + 0.513) - 0.5) * 2.0;
+        d = opSmoothUnion(
+            sdSphere(p + sin(time + fi * float3(52.5126, 64.62744, 632.25)) * float3(2.0, 2.0, 0.8),
+                     mix(0.5, 1.0, fract(fi * 412.531 + 0.5124))),
+            d,
+            0.4
+        );
+    }
+    return d;
+}
+
+static float3 calcNormal(float3 p, float iTime) {
+    const float h = 1e-5;
+    const float2 k = float2(1, -1);
+    return normalize(k.xyy * map(p + k.xyy * h, iTime) +
+                     k.yyx * map(p + k.yyx * h, iTime) +
+                     k.yxy * map(p + k.yxy * h, iTime) +
+                     k.xxx * map(p + k.xxx * h, iTime));
+}
+
+fragment float4 cineshader_lava_fs(PassthroughVOut in [[stage_in]],
+                                    constant ShadertoyUBO& U [[buffer(0)]]) {
+    float2 fragCoord = in.uv * U.iResolution;
+    float2 uv = fragCoord / U.iResolution;
+
+    float3 rayOri = float3((uv - 0.5) * float2(U.iResolution.x / U.iResolution.y, 1.0) * 6.0, 3.0);
+    float3 rayDir = float3(0.0, 0.0, -1.0);
+
+    float depth = 0.0;
+    float3 p = float3(0.0);
+
+    for (int i = 0; i < 64; i++) {
+        p = rayOri + rayDir * depth;
+        float dist = map(p, U.iTime);
+        depth += dist;
+        if (dist < 1e-6) { break; }
+    }
+
+    depth = min(6.0, depth);
+    float3 n = calcNormal(p, U.iTime);
+    float b = max(0.0, dot(n, float3(0.577)));
+    float3 col = (0.5 + 0.5 * cos((b + U.iTime * 3.0) + uv.xyx * 2.0 + float3(0, 2, 4))) * (0.85 + b * 0.35);
+    col *= exp(-depth * 0.15);
+
+    return float4(col, 1.0 - (depth - 0.5) / 2.0);
+}

data/shaders/cineshader_lava/cineshader_lava.gl.glsl

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+// Name: Cineshader Lava
+// Author: edankwan
+// URL: https://www.shadertoy.com/view/3sySRK
+#version 330 core
+precision highp float;
+
+out vec4 FragColor;
+in vec2 vUV;
+uniform vec2 iResolution;
+uniform float iTime;
+
+float opSmoothUnion( float d1, float d2, float k )
+{
+    float h = clamp( 0.5 + 0.5*(d2-d1)/k, 0.0, 1.0 );
+    return mix( d2, d1, h ) - k*h*(1.0-h);
+}
+
+float sdSphere( vec3 p, float s )
+{
+  return length(p)-s;
+}
+
+float map(vec3 p)
+{
+    float d = 2.0;
+    for (int i = 0; i < 16; i++) {
+        float fi = float(i);
+        float time = iTime * (fract(fi * 412.531 + 0.513) - 0.5) * 2.0;
+        d = opSmoothUnion(
+            sdSphere(p + sin(time + fi * vec3(52.5126, 64.62744, 632.25)) * vec3(2.0, 2.0, 0.8), mix(0.5, 1.0, fract(fi * 412.531 + 0.5124))),
+            d,
+            0.4
+        );
+    }
+    return d;
+}
+
+vec3 calcNormal( in vec3 p )
+{
+    const float h = 1e-5; // or some other value
+    const vec2 k = vec2(1,-1);
+    return normalize( k.xyy*map( p + k.xyy*h ) +
+                      k.yyx*map( p + k.yyx*h ) +
+                      k.yxy*map( p + k.yxy*h ) +
+                      k.xxx*map( p + k.xxx*h ) );
+}
+
+void mainImage( out vec4 fragColor, in vec2 fragCoord )
+{
+    vec2 uv = fragCoord/iResolution.xy;
+
+    // screen size is 6m x 6m
+    vec3 rayOri = vec3((uv - 0.5) * vec2(iResolution.x/iResolution.y, 1.0) * 6.0, 3.0);
+    vec3 rayDir = vec3(0.0, 0.0, -1.0);
+
+    float depth = 0.0;
+    vec3 p;
+
+    for(int i = 0; i < 64; i++) {
+        p = rayOri + rayDir * depth;
+        float dist = map(p);
+        depth += dist;
+        if (dist < 1e-6) {
+            break;
+        }
+    }
+
+    depth = min(6.0, depth);
+    vec3 n = calcNormal(p);
+    float b = max(0.0, dot(n, vec3(0.577)));
+    vec3 col = (0.5 + 0.5 * cos((b + iTime * 3.0) + uv.xyx * 2.0 + vec3(0,2,4))) * (0.85 + b * 0.35);
+    col *= exp( -depth * 0.15 );
+
+    // maximum thickness is 2m in alpha channel
+    fragColor = vec4(col, 1.0 - (depth - 0.5) / 2.0);
+}
+
+void main() {
+    vec2 fragCoordPixels = vUV * iResolution;
+    vec4 outColor;
+    mainImage(outColor, fragCoordPixels);
+    FragColor = outColor;
+}

data/shaders/cineshader_lava/cineshader_lava.vk.glsl

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+#version 450
+
+// Name: Cineshader Lava
+// Author: edankwan
+// URL: https://www.shadertoy.com/view/3sySRK
+
+layout(location = 0) in  vec2 vUV;
+layout(location = 0) out vec4 FragColor;
+
+layout(set = 3, binding = 0) uniform ShadertoyUBO {
+    float iTime;
+    vec2  iResolution;
+};
+
+float opSmoothUnion(float d1, float d2, float k) {
+    float h = clamp(0.5 + 0.5 * (d2 - d1) / k, 0.0, 1.0);
+    return mix(d2, d1, h) - k * h * (1.0 - h);
+}
+
+float sdSphere(vec3 p, float s) {
+    return length(p) - s;
+}
+
+float map(vec3 p) {
+    float d = 2.0;
+    for (int i = 0; i < 16; i++) {
+        float fi = float(i);
+        float time = iTime * (fract(fi * 412.531 + 0.513) - 0.5) * 2.0;
+        d = opSmoothUnion(
+            sdSphere(p + sin(time + fi * vec3(52.5126, 64.62744, 632.25)) * vec3(2.0, 2.0, 0.8), mix(0.5, 1.0, fract(fi * 412.531 + 0.5124))),
+            d,
+            0.4
+        );
+    }
+    return d;
+}
+
+vec3 calcNormal(in vec3 p) {
+    const float h = 1e-5;
+    const vec2 k = vec2(1, -1);
+    return normalize(k.xyy * map(p + k.xyy * h) +
+                     k.yyx * map(p + k.yyx * h) +
+                     k.yxy * map(p + k.yxy * h) +
+                     k.xxx * map(p + k.xxx * h));
+}
+
+void mainImage(out vec4 fragColor, in vec2 fragCoord) {
+    vec2 uv = fragCoord / iResolution.xy;
+
+    vec3 rayOri = vec3((uv - 0.5) * vec2(iResolution.x / iResolution.y, 1.0) * 6.0, 3.0);
+    vec3 rayDir = vec3(0.0, 0.0, -1.0);
+
+    float depth = 0.0;
+    vec3 p;
+
+    for (int i = 0; i < 64; i++) {
+        p = rayOri + rayDir * depth;
+        float dist = map(p);
+        depth += dist;
+        if (dist < 1e-6) { break; }
+    }
+
+    depth = min(6.0, depth);
+    vec3 n = calcNormal(p);
+    float b = max(0.0, dot(n, vec3(0.577)));
+    vec3 col = (0.5 + 0.5 * cos((b + iTime * 3.0) + uv.xyx * 2.0 + vec3(0, 2, 4))) * (0.85 + b * 0.35);
+    col *= exp(-depth * 0.15);
+
+    fragColor = vec4(col, 1.0 - (depth - 0.5) / 2.0);
+}
+
+void main() {
+    vec2 fragCoordPixels = vUV * iResolution;
+    vec4 outColor;
+    mainImage(outColor, fragCoordPixels);
+    FragColor = outColor;
+}

data/shaders/cineshader_lava/meta.txt

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+Name: Cineshader Lava
+Author: edankwan