Add assets

assets/shader.slang

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+/* Copyright (c) 2025-2026, Sascha Willems
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+struct VSInput {
+    float3 Pos;
+    float3 Normal;
+	float2 UV;
+};
+
+Sampler2D textures[];
+
+struct ShaderData {
+    float4x4 projection;
+    float4x4 view;
+    float4x4 model[3];
+    float4 lightPos;
+    uint32_t selected;
+};
+
+struct VSOutput {
+    float4 Pos : SV_POSITION;
+    float3 Normal;
+    float2 UV;
+    float3 Factor;
+    float3 LightVec;
+    float3 ViewVec;
+    uint32_t InstanceIndex;
+};
+
+[shader("vertex")]
+VSOutput main(VSInput input, uniform ShaderData *shaderData, uint instanceIndex : SV_VulkanInstanceID) {
+    VSOutput output;
+    float4x4 modelMat = shaderData->model[instanceIndex];
+    output.Normal = mul((float3x3)mul(shaderData->view, modelMat), input.Normal);
+    output.UV = input.UV;
+    output.Pos = mul(shaderData->projection, mul(shaderData->view, mul(modelMat, float4(input.Pos.xyz, 1.0))));
+    output.Factor = (shaderData->selected == instanceIndex ? 3.0f : 1.0f);
+    output.InstanceIndex = instanceIndex;
+    // Calculate view vectors required for lighting
+    float4 fragPos = mul(mul(shaderData->view, modelMat), float4(input.Pos.xyz, 1.0));
+    output.LightVec = shaderData->lightPos.xyz - fragPos.xyz;
+    output.ViewVec = -fragPos.xyz;
+    return output;
+}
+
+[shader("fragment")]
+float4 main(VSOutput input) {
+    // Phong lighting
+    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), 0.0025);
+    float3 specular = pow(max(dot(R, V), 0.0), 16.0) * 0.75;
+    // Sample from texture
+    float3 color = textures[NonUniformResourceIndex(input.InstanceIndex)].Sample(input.UV).rgb * input.Factor;
+    return float4(diffuse * color.rgb + specular, 1.0);
+}

assets/suzanne.mtl

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+# Blender 5.0.1 MTL File: 'suzanne4.blend'
+# www.blender.org
+
+newmtl Material
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.500000
+d 1.000000
+illum 2
+
+newmtl Material.001
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.127605 0.127605 0.127605
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.500000
+d 1.000000
+illum 2
+
+newmtl Material.002
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.000000 0.000000 0.000000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.500000
+d 1.000000
+illum 2
+
+newmtl Material.003
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.500000
+d 1.000000
+illum 2
+
+newmtl Material.004
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800007 0.200800 0.327761
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.500000
+d 1.000000
+illum 2
+
+newmtl Material.005
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 1.000000 1.000000 1.000000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.500000
+d 1.000000
+illum 2