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

data/shaders/test/meta.txt

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+Name: Test
+Author: JailDesigner

data/shaders/test/test.frag.msl

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+#include <metal_stdlib>
+using namespace metal;
+
+// Test shader (Metal Shading Language port of test.vk.glsl).
+// Author: JailDesigner
+
+struct ShadertoyUBO {
+    float iTime;
+    float2 iResolution;
+};
+
+struct PassthroughVOut {
+    float4 pos [[position]];
+    float2 uv;
+};
+
+static float3 palette(float t) {
+    float3 a = float3(1.0, 0.5, 0.5);
+    float3 b = float3(1.0, 0.5, 0.5);
+    float3 c = float3(1.0, 1.0, 1.0);
+    float3 d = float3(0.263, 0.416, 0.557);
+    return a + b * cos(6.28318 * (c * t * d));
+}
+
+fragment float4 test_fs(PassthroughVOut in [[stage_in]],
+                        constant ShadertoyUBO& u [[buffer(0)]]) {
+    float2 fragCoord = in.uv * u.iResolution;
+    float2 uv = (fragCoord * 2.0 - u.iResolution) / u.iResolution.y;
+    float d = length(uv);
+    float3 col = palette(d);
+    d = sin(d * 8.0 + u.iTime) / 8.0;
+    d = abs(d);
+    d = 0.02 / d;
+    col *= d;
+    return float4(col, 1.0);
+}

data/shaders/test/test.gl.glsl

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+// Name: Test
+// Author: JailDesigner
+#version 330 core
+out vec4 FragColor;
+in vec2 vUV;
+uniform vec2 iResolution;
+uniform float iTime;
+
+vec3 palette( float t) {
+    vec3 a = vec3(1.0, 0.5, 0.5);
+    vec3 b = vec3(1.0, 0.5, 0.5);
+    vec3 c = vec3(1.0, 1.0, 1.0);
+    vec3 d = vec3(0.263, 0.416, 0.557);
+    return a + b * cos( 6.28318 * (c * t * d) );
+}
+
+void mainImage( out vec4 fragColor, in vec2 fragCoord )
+{
+    vec2 uv = (fragCoord * 2.0 - iResolution.xy) / iResolution.y;
+    float d = length(uv);
+    vec3 col = palette(d);
+    d = sin(d * 8.0 + iTime) / 8.0;
+    d = abs(d);
+    d = 0.02 / d;
+    col *= d;
+    fragColor = vec4(col, 1.0);
+}
+
+void main() {
+    vec2 fragCoordPixels = vUV * iResolution;
+    vec4 outColor;
+    mainImage(outColor, fragCoordPixels);
+    FragColor = outColor;
+}

data/shaders/test/test.vk.glsl

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+#version 450
+
+// Name: Test
+// Author: JailDesigner
+//
+// Vulkan port of test.gl.glsl. Bindings follow the SDL3 GPU convention:
+//   set=3, binding=0 — fragment uniform buffer (anonymous block: members
+//   are accessible directly as iTime / iResolution, like Shadertoy).
+
+layout(location = 0) in  vec2 vUV;
+layout(location = 0) out vec4 FragColor;
+
+layout(set = 3, binding = 0) uniform ShadertoyUBO {
+    float iTime;
+    vec2  iResolution;
+};
+
+vec3 palette(float t) {
+    vec3 a = vec3(1.0, 0.5, 0.5);
+    vec3 b = vec3(1.0, 0.5, 0.5);
+    vec3 c = vec3(1.0, 1.0, 1.0);
+    vec3 d = vec3(0.263, 0.416, 0.557);
+    return a + b * cos(6.28318 * (c * t * d));
+}
+
+void mainImage(out vec4 fragColor, in vec2 fragCoord) {
+    vec2 uv = (fragCoord * 2.0 - iResolution) / iResolution.y;
+    float d = length(uv);
+    vec3 col = palette(d);
+    d = sin(d * 8.0 + iTime) / 8.0;
+    d = abs(d);
+    d = 0.02 / d;
+    col *= d;
+    fragColor = vec4(col, 1.0);
+}
+
+void main() {
+    vec2 fragCoordPixels = vUV * iResolution;
+    vec4 outColor;
+    mainImage(outColor, fragCoordPixels);
+    FragColor = outColor;
+}