first commit

assets/shaders/skybox.frag

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+#version 450 core
+layout(location = 0) out vec4 oColor;
+
+layout(std140, binding = 0) uniform PerFrame {
+  mat4 uView;
+  mat4 uProj;
+  vec4 uLightDir; // unused
+};
+layout(std140, binding = 2) uniform Material {
+  vec4 uAlbedo; // unused
+};
+
+layout(location = 0) in  vec3 vDir;
+
+// sRGB-tuned colors; we’ll convert to linear before mixing
+vec3 srgb2lin(vec3 c){ return pow(c, vec3(2.2)); }
+vec3 lin2srgb(vec3 c){ return pow(c, vec3(1.0/2.2)); }
+
+void main() {
+  // nicer defaults (tweak to taste)
+  vec3 skyTopL     = srgb2lin(vec3(0.15, 0.35, 0.75));
+  vec3 skyHorizonL = srgb2lin(vec3(0.75, 0.85, 0.98));
+
+  vec3 dir = normalize(vDir);
+
+   float t = clamp(dir.z * 0.5 + 0.5, 0.0, 1.0); // (B) world up = +Z
+
+  // shape the gradient a bit
+  t = pow(t, 1.45);
+
+  vec3 colorL = mix(skyHorizonL, skyTopL, t);
+  oColor = vec4(lin2srgb(colorL), 1.0); // manual gamma (your default FB isn’t sRGB)
+}