Add slang shader for ray tracing basic sample

shaders/slang/raytracingbasic/raytracingbasic.slang

@@ -0,0 +1,60 @@
+/* Copyright (c) 2025, Sascha Willems
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+RaytracingAccelerationStructure accelStruct;
+RWTexture2D<float4> image;
+struct CameraProperties
+{
+	float4x4 viewInverse;
+	float4x4 projInverse;
+};
+ConstantBuffer<CameraProperties> cam;
+
+struct Attributes
+{
+    float2 bary;
+};
+
+struct Payload
+{
+	float3 hitValue;
+};
+
+[shader("raygeneration")]
+void raygenerationMain()
+{
+	uint3 LaunchID = DispatchRaysIndex();
+	uint3 LaunchSize = DispatchRaysDimensions();
+
+	const float2 pixelCenter = float2(LaunchID.xy) + float2(0.5, 0.5);
+	const float2 inUV = pixelCenter/float2(LaunchSize.xy);
+	float2 d = inUV * 2.0 - 1.0;
+	float4 target = mul(cam.projInverse, float4(d.x, d.y, 1, 1));
+
+	RayDesc rayDesc;
+	rayDesc.Origin = mul(cam.viewInverse, float4(0,0,0,1)).xyz;
+	rayDesc.Direction = mul(cam.viewInverse, float4(normalize(target.xyz), 0)).xyz;
+	rayDesc.TMin = 0.001;
+	rayDesc.TMax = 10000.0;
+
+    Payload payload;
+    TraceRay(accelStruct, RAY_FLAG_FORCE_OPAQUE, 0xff, 0, 0, 0, rayDesc, payload);
+
+	image[int2(LaunchID.xy)] = float4(payload.hitValue, 0.0);
+}
+
+[shader("closesthit")]
+void closesthitMain(inout Payload p, in Attributes attribs)
+{
+    const float3 barycentricCoords = float3(1.0f - attribs.bary.x - attribs.bary.y, attribs.bary.x, attribs.bary.y);
+    p.hitValue = barycentricCoords;
+}
+
+[shader("miss")]
+void missMain(inout Payload p)
+{
+    p.hitValue = float3(0.0, 0.0, 0.2);
+}