Add slang shaders for additional samples

shaders/slang/bloom/gaussblur.slang

@@ -0,0 +1,63 @@
+/* Copyright (c) 2025, Sascha Willems
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+struct VSOutput
+{
+    float4 Pos : SV_POSITION;
+    float2 UV;
+};
+
+struct UBO
+{
+	float blurScale;
+	float blurStrength;
+};
+ConstantBuffer<UBO> ubo;
+
+Sampler2D samplerColor;
+
+[[SpecializationConstant]] const int blurdirection = 0;
+
+[shader("vertex")]
+VSOutput vertexMain(uint VertexIndex: SV_VertexID)
+{
+    VSOutput output;
+    output.UV = float2((VertexIndex << 1) & 2, VertexIndex & 2);
+    output.Pos = float4(output.UV * 2.0f - 1.0f, 0.0f, 1.0f);
+    return output;
+}
+
+[shader("fragment")]
+float4 fragmentMain(VSOutput input)
+{
+	float weight[5];
+	weight[0] = 0.227027;
+	weight[1] = 0.1945946;
+	weight[2] = 0.1216216;
+	weight[3] = 0.054054;
+	weight[4] = 0.016216;
+
+    float2 textureSize;
+    samplerColor.GetDimensions(textureSize.x, textureSize.y);
+    float2 tex_offset = 1.0 / textureSize * ubo.blurScale;        	// gets size of single texel
+    float3 result = samplerColor.Sample(input.UV).rgb * weight[0]; 	// current fragment's contribution
+	for(int i = 1; i < 5; ++i)
+	{
+		if (blurdirection == 1)
+		{
+            // H
+            result += samplerColor.Sample(input.UV + float2(tex_offset.x * i, 0.0)).rgb * weight[i] * ubo.blurScale;
+            result += samplerColor.Sample(input.UV - float2(tex_offset.x * i, 0.0)).rgb * weight[i] * ubo.blurScale;
+		}
+		else
+		{
+            // V
+            result += samplerColor.Sample(input.UV + float2(0.0, tex_offset.y * i)).rgb * weight[i] * ubo.blurScale;
+            result += samplerColor.Sample(input.UV - float2(0.0, tex_offset.y * i)).rgb * weight[i] * ubo.blurScale;
+		}
+	}
+	return float4(result, 1.0);
+}