Added slang shaders for additional samples

shaders/slang/particlesystem/normalmap.slang

@@ -0,0 +1,98 @@
+/* Copyright (c) 2025, Sascha Willems
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+struct VSInput
+{
+    float3 Pos;
+    float2 UV;
+    float3 Normal;
+    float4 Tangent;
+};
+
+struct VSOutput
+{
+    float4 Pos : SV_POSITION;
+    float2 UV;
+    float3 LightVec;
+    float3 LightVecB;
+    float3 LightDir;
+    float3 ViewVec;
+};
+
+struct UBO
+{
+    float4x4 projection;
+    float4x4 model;
+    float4x4 normal;
+    float4 lightPos;
+};
+ConstantBuffer<UBO> ubo;
+
+Sampler2D samplerColorMap;
+Sampler2D samplerNormalHeightMap;
+
+#define lightRadius 45.0
+
+[shader("vertex")]
+VSOutput vertexMain(VSInput input)
+{
+    VSOutput output;
+    float3 vertexPosition = mul(ubo.model, float4(input.Pos, 1.0)).xyz;
+    output.LightDir = normalize(ubo.lightPos.xyz - vertexPosition);
+
+    float3 biTangent = cross(input.Normal, input.Tangent.xyz);
+
+    // Setup (t)angent-(b)inormal-(n)ormal matrix for converting
+    // object coordinates into tangent space
+    float3x3 tbnMatrix;
+    tbnMatrix[0] = mul((float3x3)ubo.normal, input.Tangent.xyz);
+    tbnMatrix[1] = mul((float3x3)ubo.normal, biTangent);
+    tbnMatrix[2] = mul((float3x3)ubo.normal, input.Normal);
+
+    output.LightVec.xyz = mul(float3(ubo.lightPos.xyz - vertexPosition), tbnMatrix);
+
+    float3 lightDist = ubo.lightPos.xyz - input.Pos;
+    output.LightVecB.x = dot(input.Tangent.xyz, lightDist);
+    output.LightVecB.y = dot(biTangent, lightDist);
+    output.LightVecB.z = dot(input.Normal, lightDist);
+
+    output.ViewVec.x = dot(input.Tangent.xyz, input.Pos);
+    output.ViewVec.y = dot(biTangent, input.Pos);
+    output.ViewVec.z = dot(input.Normal, input.Pos);
+
+    output.UV = input.UV;
+
+    output.Pos = mul(ubo.projection, mul(ubo.model, float4(input.Pos, 1.0)));
+    return output;
+}
+
+[shader("fragment")]
+float4 fragmentMain(VSOutput input)
+{
+	float3 specularColor = float3(0.85, 0.5, 0.0);
+
+	float invRadius = 1.0/lightRadius;
+	float ambient = 0.25;
+
+	float3 rgb, normal;
+
+    rgb = samplerColorMap.Sample(input.UV).rgb;
+    normal = normalize((samplerNormalHeightMap.Sample(input.UV).rgb - 0.5) * 2.0);
+
+	float distSqr = dot(input.LightVecB, input.LightVecB);
+	float3 lVec = input.LightVecB * rsqrt(distSqr);
+
+	float atten = max(clamp(1.0 - invRadius * sqrt(distSqr), 0.0, 1.0), ambient);
+	float diffuse = clamp(dot(lVec, normal), 0.0, 1.0);
+
+	float3 light = normalize(-input.LightVec);
+	float3 view = normalize(input.ViewVec);
+	float3 reflectDir = reflect(-light, normal);
+
+	float specular = pow(max(dot(view, reflectDir), 0.0), 4.0);
+
+	return float4((rgb * atten + (diffuse * rgb + 0.5 * specular * specularColor.rgb)) * atten, 1.0);
+}

shaders/slang/particlesystem/particle.slang

@@ -0,0 +1,97 @@
+/* Copyright (c) 2025, Sascha Willems
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+struct VSInput
+{
+	float4 Pos;
+	float4 Color;
+	float Alpha;
+	float Size;
+	float Rotation;
+	int Type;
+};
+
+struct VSOutput
+{
+    float4 Pos : SV_POSITION;
+    float PSize : SV_PointSize;
+    float4 Color;
+    float Alpha;
+    int Type;
+    float Rotation;
+    float2 CenterPos;
+    float PointSize;
+};
+
+struct UBO
+{
+    float4x4 projection;
+    float4x4 modelview;
+    float2 viewportDim;
+    float pointSize;
+};
+ConstantBuffer<UBO> ubo;
+
+Sampler2D samplerSmoke;
+Sampler2D samplerFire;
+
+[shader("vertex")]
+VSOutput vertexMain(VSInput input)
+{
+    VSOutput output;
+    output.Color = input.Color;
+    output.Alpha = input.Alpha;
+    output.Type = input.Type;
+    output.Rotation = input.Rotation;
+
+    output.Pos = mul(ubo.projection, mul(ubo.modelview, float4(input.Pos.xyz, 1.0)));
+
+    // Base size of the point sprites
+    float spriteSize = 8.0 * input.Size;
+
+    // Scale particle size depending on camera projection
+    float4 eyePos = mul(ubo.modelview, float4(input.Pos.xyz, 1.0));
+    float4 projectedCorner = mul(ubo.projection, float4(0.5 * spriteSize, 0.5 * spriteSize, eyePos.z, eyePos.w));
+    output.PointSize = output.PSize = ubo.viewportDim.x * projectedCorner.x / projectedCorner.w;
+    output.CenterPos = ((output.Pos.xy / output.Pos.w) + 1.0) * 0.5 * ubo.viewportDim;
+    return output;
+}
+
+[shader("fragment")]
+float4 fragmentMain(VSOutput input)
+{
+	float4 color;
+	float alpha = (input.Alpha <= 1.0) ? input.Alpha : 2.0 - input.Alpha;
+
+	// Rotate texture coordinates
+	// Rotate UV
+	float rotCenter = 0.5;
+	float rotCos = cos(input.Rotation);
+	float rotSin = sin(input.Rotation);
+
+	float2 PointCoord = (input.Pos.xy - input.CenterPos.xy) / input.PointSize + 0.5;
+
+	float2 rotUV = float2(
+		rotCos * (PointCoord.x - rotCenter) + rotSin * (PointCoord.y - rotCenter) + rotCenter,
+		rotCos * (PointCoord.y - rotCenter) - rotSin * (PointCoord.x - rotCenter) + rotCenter);
+
+	float4 outFragColor;
+	if (input.Type == 0)
+	{
+        // Flame
+        color = samplerFire.Sample(rotUV);
+		outFragColor.a = 0.0;
+	}
+	else
+	{
+        // Smoke
+        color = samplerSmoke.Sample(rotUV);
+		outFragColor.a = color.a * alpha;
+	}
+
+	outFragColor.rgb = color.rgb * input.Color.rgb * alpha;
+	return outFragColor;
+}