fix: openxr swapchain banding

src/shaders/mod.rs

@@ -97,7 +97,7 @@ pub mod frag_screen {
 
                 // linear to srgb
                 bvec4 cutoff = lessThan(out_color, vec4(0.0031308));
-                vec4 higher = (pow(out_color, vec4(0.41666)) * vec4(1.055)) - vec4(0.055);
+                vec4 higher = (pow(out_color, vec4(0.4166667)) * vec4(1.055)) - vec4(0.055);
                 vec4 lower = out_color*vec4(12.92);
                 out_color = mix(higher, lower, cutoff);
                 out_color.a = 1.0;
@@ -135,3 +135,26 @@ pub mod frag_srgb {
         ",
     }
 }
+
+pub mod frag_swapchain {
+    vulkano_shaders::shader! {
+        ty: "fragment",
+        src: r"#version 310 es
+            precision highp float;
+
+            layout (location = 0) in vec2 in_uv;
+            layout (location = 0) out vec4 out_color;
+
+            layout (set = 0, binding = 0) uniform sampler2D in_texture;
+            layout (set = 1, binding = 0) uniform AlphaBlock {
+                uniform float alpha;
+            };
+
+            void main()
+            {
+                out_color = texture(in_texture, in_uv);
+                out_color.a = alpha;
+            }
+        ",
+    }
+}