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destrum/assets_src/shaders/skybox.frag

@@ -15,21 +15,15 @@ layout(push_constant) uniform SkyboxPC {
 
 void main()
 {
-    // Fullscreen-triangle trick gives uv in [0..2]. Convert to [0..1].
-    vec2 uv01 = uv * 0.5;
+    vec2 ndcXY = uv * 2.0 - 1.0;
 
-    // Build an NDC point on the far plane.
-    // Vulkan NDC is x,y in [-1..1], z in [0..1]. Using z=1 means "far".
-    vec4 ndc = vec4(uv01 * 2.0 - 1.0, 1.0, 1.0);
+    vec4 ndc = vec4(ndcXY, 1.0, 1.0);
 
-    // Unproject to world space
     vec4 world = pcs.invViewProj * ndc;
     vec3 worldPos = world.xyz / world.w;
 
-    // Direction from camera through this pixel
     vec3 dir = normalize(worldPos - pcs.cameraPos.xyz);
+    dir.y *= -1.0;
 
-    // Sample cubemap directly
     outColor = sampleTextureCubeLinear(pcs.skyboxTextureId, dir);
-    // outColor = sampleTextureCubeNearest(pcs.skyboxTextureId, dir);
 }