Added final missing slang shaders

Requires a very recent version of slang

shaders/slang/subpasses/transparent.slang

@@ -0,0 +1,64 @@
+/* Copyright (c) 2025, Sascha Willems
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+struct VSInput
+{
+	float4 Pos;
+	float3 Color;
+	float3 Normal;
+	float2 UV;
+};
+
+struct VSOutput
+{
+    float4 Pos : SV_POSITION;
+    float3 Color;
+    float2 UV;
+};
+
+struct UBO
+{
+    float4x4 projection;
+    float4x4 model;
+    float4x4 view;
+};
+ConstantBuffer<UBO> ubo;
+
+[[vk::input_attachment_index(0)]] SubpassInput samplerPositionDepth;
+
+Sampler2D samplerTexture;
+
+[[SpecializationConstant]] const float NEAR_PLANE = 0.1f;
+[[SpecializationConstant]] const float FAR_PLANE = 256.0f;
+
+float linearDepth(float depth)
+{
+    float z = depth * 2.0f - 1.0f;
+    return (2.0f * NEAR_PLANE * FAR_PLANE) / (FAR_PLANE + NEAR_PLANE - z * (FAR_PLANE - NEAR_PLANE));
+}
+
+[shader("vertex")]
+VSOutput vertexMain(VSInput input)
+{
+    VSOutput output;
+    output.Color = input.Color;
+    output.UV = input.UV;
+    output.Pos = mul(ubo.projection, mul(ubo.view, mul(ubo.model, float4(input.Pos.xyz, 1.0))));
+    return output;
+} 
+
+[shader("fragment")]
+float4 fragmentMain (VSOutput input)
+{
+	// Sample depth from deferred depth buffer and discard if obscured
+	float depth = samplerPositionDepth.SubpassLoad().a;
+	if ((depth != 0.0) && (linearDepth(input.Pos.z) > depth))
+	{
+		clip(-1);
+	};
+
+    return samplerTexture.Sample(input.UV);
+}