Migrate GLSL to Slang, text shader

assets/shaders/skybox.slang

@@ -0,0 +1,38 @@
+import "includes/math";
+import "includes/structs";
+
+[[vk::binding(0, 0)]] ConstantBuffer<GlobalUniforms> _Global;
+[[vk::binding(1, 0)]] SamplerState _Sampler;
+[[vk::binding(2, 0)]] TextureCube _Texture;
+
+struct Vertex {
+    [[vk::location(0)]] float3 directionWS;
+}
+
+struct Varyings {
+    float4 positionCS : SV_Position;
+    float3 texCoord;
+}
+
+[shader("vertex")]
+Varyings vertexMain(Vertex vert) {
+    Varyings out;
+
+    let directionVS = mul(_Global.matrixWStoVS, float4(vert.directionWS, 0.0)).xyz;
+    let directionCS = mul(_Global.matrixVStoCS, float4(directionVS, 0.0));
+
+    out.positionCS = float4(directionCS.xy, 0.0, directionCS.w);
+    out.texCoord = -vert.directionWS;
+    return out;
+}
+
+[shader("fragment")]
+float4 fragmentMain(Varyings frag) : SV_Target {
+    let texel = _Texture.Sample(_Sampler, frag.texCoord);
+    let outgoingRadiance = texel.rgb;
+
+    let toneMappedLinearColor = toneMapAcesNarkowicz(outgoingRadiance);
+    let toneMappedSrgbColor = linearToSrgbColor(toneMappedLinearColor);
+
+    return float4(toneMappedSrgbColor, 1.0);
+}