Added slang shaders for additional samples

Author: SaschaWillems

shaders/slang/multithreading/phong.slang

@@ -0,0 +1,54 @@
+/* Copyright (c) 2025, Sascha Willems
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+struct VSInput
+{
+    float3 Pos;
+    float3 Normal;
+    float3 Color;
+};
+
+struct VSOutput
+{
+    float4 Pos : SV_POSITION;
+    float3 Normal;
+    float3 Color;
+    float3 ViewVec;
+    float3 LightVec;
+};
+
+[shader("vertex")]
+VSOutput vertexMain(VSInput input, uniform float4x4 mvp, uniform float3 color)
+{
+    VSOutput output;
+    if ((input.Color.r == 1.0) && (input.Color.g == 0.0) && (input.Color.b == 0.0))
+    {
+        output.Color = color;
+    }
+    else
+    {
+        output.Color = input.Color;
+    }
+    output.Pos = mul(mvp, float4(input.Pos.xyz, 1.0));
+    float4 pos = mul(mvp, float4(input.Pos, 1.0));
+    output.Normal = mul((float3x3)mvp, input.Normal);
+    float3 lPos = float3(0.0, 0.0, 0.0);
+    output.LightVec = lPos - pos.xyz;
+    output.ViewVec = -pos.xyz;
+    return output;
+}
+
+[shader("fragment")]
+float4 fragmentMain(VSOutput input)
+{
+	float3 N = normalize(input.Normal);
+	float3 L = normalize(input.LightVec);
+	float3 V = normalize(input.ViewVec);
+	float3 R = reflect(-L, N);
+	float3 diffuse = max(dot(N, L), 0.0) * input.Color;
+	float3 specular = pow(max(dot(R, V), 0.0), 8.0) * float3(0.75, 0.75, 0.75);
+	return float4(diffuse + specular, 1.0);
+}

shaders/slang/multithreading/starsphere.slang

@@ -0,0 +1,58 @@
+/* Copyright (c) 2025, Sascha Willems
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+#define HASHSCALE3 float3(443.897, 441.423, 437.195)
+#define STARFREQUENCY 0.01
+
+// Hash function by Dave Hoskins (https://www.shadertoy.com/view/4djSRW)
+float hash33(float3 p3)
+{
+	p3 = frac(p3 * HASHSCALE3);
+    p3 += dot(p3, p3.yxz+float3(19.19, 19.19, 19.19));
+    return frac((p3.x + p3.y)*p3.z + (p3.x+p3.z)*p3.y + (p3.y+p3.z)*p3.x);
+}
+
+float3 starField(float3 pos)
+{
+	float3 color = float3(0.0, 0.0, 0.0);
+    float threshhold = (1.0 - STARFREQUENCY);
+    float rnd = hash33(pos);
+    if (rnd >= threshhold)
+    {
+        float starCol = pow((rnd - threshhold) / (1.0 - threshhold), 16.0);
+		color += starCol.xxx;
+    }
+	return color;
+}
+
+struct VSInput
+{
+    float3 Pos;
+}
+
+struct VSOutput
+{
+    float4 Pos : SV_POSITION;
+    float3 UVW;
+};
+
+[shader("vertex")]
+VSOutput vertexMain(VSInput input, uniform float4x4 mvp)
+{
+    VSOutput output;
+    output.UVW = input.Pos;
+    output.Pos = mul(mvp, float4(input.Pos.xyz, 1.0));
+    return output;
+}
+
+[shader("fragment")]
+float4 fragmentMain(VSOutput input)
+{
+    // Fake atmosphere at the bottom
+    float3 atmosphere = clamp(float3(0.1, 0.15, 0.4) * (input.UVW.y + 0.25), 0.0, 1.0);
+	float3 color = starField(input.UVW) + atmosphere;
+	return float4(color, 1.0);
+}

shaders/slang/offscreen/mirror.slang

@@ -0,0 +1,68 @@
+/* Copyright (c) 2025, Sascha Willems
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+struct VSInput
+{
+	float3 Pos;
+};
+
+struct VSOutput
+{
+    float4 Pos : SV_POSITION;
+    float4 ProjCoord;
+};
+
+struct UBO
+{
+    float4x4 projection;
+    float4x4 view;
+    float4x4 model;
+};
+ConstantBuffer<UBO> ubo;
+
+Sampler2D samplerColor;
+
+[shader("vertex")]
+VSOutput vertexMain(VSInput input)
+{
+    VSOutput output;
+    output.ProjCoord = mul(ubo.projection, mul(ubo.view, mul(ubo.model, float4(input.Pos.xyz, 1.0))));
+    output.Pos = output.ProjCoord;
+    return output;
+}
+
+[shader("fragment")]
+float4 fragmentMain(VSOutput input, bool FrontFacing : SV_IsFrontFace)
+{
+	float4 tmp = (1.0 / input.ProjCoord.w).xxxx;
+	float4 projCoord = input.ProjCoord * tmp;
+
+	// Scale and bias
+	projCoord += float4(1.0, 1.0, 1.0, 1.0);
+	projCoord *= float4(0.5, 0.5, 0.5, 0.5);
+
+	// Slow single pass blur
+	// For demonstration purposes only
+	const float blurSize = 1.0 / 512.0;
+
+	float4 color = float4(float3(0.0, 0.0, 0.0), 1.);
+
+	if (FrontFacing)
+	{
+		// Only render mirrored scene on front facing (upper) side of mirror surface
+		float4 reflection = float4(0.0, 0.0, 0.0, 0.0);
+		for (int x = -3; x <= 3; x++)
+		{
+			for (int y = -3; y <= 3; y++)
+            {
+                reflection += samplerColor.Sample(float2(projCoord.x + x * blurSize, projCoord.y + y * blurSize)) / 49.0;
+			}
+		}
+		color += reflection;
+	}
+
+	return color;
+}

shaders/slang/offscreen/phong.slang

@@ -0,0 +1,63 @@
+/* Copyright (c) 2025, Sascha Willems
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+struct VSInput
+{
+    float3 Pos;
+    float3 Color;
+    float3 Normal;
+};
+
+struct VSOutput
+{
+    float4 Pos : SV_POSITION;
+    float ClipDistance : SV_ClipDistance0;
+    float3 Normal;
+    float3 Color;
+    float3 EyePos;
+    float3 LightVec;
+};
+
+struct UBO
+{
+    float4x4 projection;
+    float4x4 view;
+    float4x4 model;
+    float4 lightPos;
+};
+ConstantBuffer<UBO> ubo;
+
+[shader("vertex")]
+VSOutput vertexMain(VSInput input)
+{
+    VSOutput output;
+    output.Normal = input.Normal;
+    output.Color = input.Color;
+    output.Pos = mul(ubo.projection, mul(ubo.view, mul(ubo.model, float4(input.Pos, 1.0))));
+    output.EyePos = mul(ubo.view, mul(ubo.model, float4(input.Pos, 1.0))).xyz;
+    output.LightVec = normalize(ubo.lightPos.xyz - output.EyePos);
+    // Clip against reflection plane
+    float4 clipPlane = float4(0.0, 0.0, 0.0, 0.0);
+    output.ClipDistance = dot(float4(input.Pos, 1.0), clipPlane);
+    return output;
+}
+
+
+[shader("fragment")]
+float4 fragmentMain(VSOutput input)
+{
+	float3 Eye = normalize(-input.EyePos);
+	float3 Reflected = normalize(reflect(-input.LightVec, input.Normal));
+	float4 IAmbient = float4(0.1, 0.1, 0.1, 1.0);
+	float4 IDiffuse = max(dot(input.Normal, input.LightVec), 0.0).xxxx;
+	float specular = 0.75;
+	float4 ISpecular = float4(0.0, 0.0, 0.0, 0.0);
+	if (dot(input.EyePos, input.Normal) < 0.0)
+	{
+		ISpecular = float4(0.5, 0.5, 0.5, 1.0) * pow(max(dot(Reflected, Eye), 0.0), 16.0) * specular;
+	}
+	return float4((IAmbient + IDiffuse) * float4(input.Color, 1.0) + ISpecular);
+}

shaders/slang/offscreen/quad.slang

@@ -0,0 +1,28 @@
+/* Copyright (c) 2025, Sascha Willems
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+struct VSOutput
+{
+    float4 Pos : SV_POSITION;
+    float2 UV;
+};
+
+[[vk::binding(1, 0)]] Sampler2D samplerColor;
+
+[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)
+{
+    return samplerColor.Sample(input.UV);
+}