Add slang shaders for additional samples

shaders/slang/sphericalenvmapping/sem.slang

@@ -0,0 +1,58 @@
+/* Copyright (c) 2025, Sascha Willems
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+struct VSInput
+{
+    float4 Pos;
+    float3 Normal;
+    float3 Color;
+};
+
+struct VSOutput
+{
+    float4 Pos : SV_POSITION;
+    float3 Color;
+    float3 EyePos;
+    float3 Normal;
+    int TexIndex;
+};
+
+struct UBO
+{
+    float4x4 projection;
+    float4x4 model;
+    float4x4 normal;
+    float4x4 view;
+    int texIndex;
+};
+ConstantBuffer<UBO> ubo;
+
+Sampler2DArray matCapSampler;
+
+[shader("vertex")]
+VSOutput vertexMain(VSInput input)
+{
+    VSOutput output;
+    output.Color = input.Color;
+    float4x4 modelView = mul(ubo.view, ubo.model);
+    output.EyePos = normalize(mul(modelView, input.Pos).xyz);
+    output.TexIndex = ubo.texIndex;
+    output.Normal = normalize(mul((float3x3)ubo.normal, input.Normal));
+    float3 r = reflect(output.EyePos, output.Normal);
+    float m = 2.0 * sqrt(pow(r.x, 2.0) + pow(r.y, 2.0) + pow(r.z + 1.0, 2.0));
+    output.Pos = mul(ubo.projection, mul(modelView, input.Pos));
+    return output;
+}
+
+[shader("fragment")]
+float4 fragmentMain(VSOutput input)
+{
+	float3 r = reflect( input.EyePos, input.Normal );
+	float3 r2 = float3( r.x, r.y, r.z + 1.0 );
+	float m = 2.0 * length( r2 );
+	float2 vN = r.xy / m + .5;
+	return float4(matCapSampler.Sample(float3(vN, input.TexIndex)).rgb * (clamp(input.Color.r * 2, 0.0, 1.0)), 1.0);
+}