Added final missing slang shaders

Requires a very recent version of slang

shaders/slang/subpasses/gbuffer.slang

@@ -0,0 +1,78 @@
+/* Copyright (c) 2025, Sascha Willems
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+struct VSInput
+{
+    float4 Pos;
+    float3 Color;
+    float3 Normal;
+};
+
+struct VSOutput
+{
+    float4 Pos : SV_POSITION;
+    float3 Normal;
+    float3 Color;
+    float3 WorldPos;
+    float3 Tangent;
+};
+
+struct FSOutput
+{
+    float4 Color : SV_TARGET0;
+    float4 Position : SV_TARGET1;
+    float4 Normal : SV_TARGET2;
+    float4 Albedo : SV_TARGET3;
+};
+
+struct UBO
+{
+    float4x4 projection;
+    float4x4 model;
+    float4x4 view;
+};
+ConstantBuffer<UBO> ubo;
+
+[[SpecializationConstant]] const float NEAR_PLANE = 0.1;
+[[SpecializationConstant]] const float FAR_PLANE = 256.0;
+
+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.Pos = mul(ubo.projection, mul(ubo.view, mul(ubo.model, input.Pos)));
+    // Vertex position in world space
+    output.WorldPos = mul(ubo.model, input.Pos).xyz;
+    // GL to Vulkan coord space
+    output.WorldPos.y = -output.WorldPos.y;
+    // Normal in world space
+    output.Normal = mul((float3x3)ubo.model, normalize(input.Normal));
+    // Currently just vertex color
+    output.Color = input.Color;
+    return output;
+}
+
+[shader("fragment")]
+FSOutput fragmentMain(VSOutput input)
+{
+	FSOutput output;
+	output.Position = float4(input.WorldPos, 1.0);
+	float3 N = normalize(input.Normal);
+	N.y = -N.y;
+	output.Normal = float4(N, 1.0);
+	output.Albedo.rgb = input.Color;
+    // Store linearized depth in alpha component
+	output.Position.a = linearDepth(input.Pos.z);
+	// Write color attachments to avoid undefined behaviour (validation error)
+	output.Color = float4(0.0);
+	return output;
+}