70 lines
1.6 KiB
Text
70 lines
1.6 KiB
Text
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/* Copyright (c) 2025, Sascha Willems
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*
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* SPDX-License-Identifier: MIT
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*
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*/
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struct VSInput
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{
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float3 Pos;
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float3 Normal;
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};
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struct VSOutput
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{
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float4 Pos : SV_POSITION;
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float3 WorldPos;
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float3 Normal;
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float LodBias;
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float3 ViewVec;
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float3 LightVec;
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};
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struct UBO
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{
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float4x4 projection;
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float4x4 model;
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float4x4 invModel;
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float lodBias;
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};
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ConstantBuffer<UBO> ubo;
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SamplerCube samplerColor;
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[shader("vertex")]
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VSOutput vertexMain(VSInput input)
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{
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VSOutput output;
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output.Pos = mul(ubo.projection, mul(ubo.model, float4(input.Pos.xyz, 1.0)));
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output.WorldPos = mul(ubo.model, float4(input.Pos, 1.0)).xyz;
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output.Normal = mul((float3x3)ubo.model, input.Normal);
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output.LodBias = ubo.lodBias;
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float3 lightPos = float3(0.0f, -5.0f, 5.0f);
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output.LightVec = lightPos.xyz - output.WorldPos.xyz;
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output.ViewVec = -output.WorldPos;
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return output;
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}
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[shader("fragment")]
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float4 fragmentMain(VSOutput input) : SV_TARGET
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{
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float3 cI = normalize (input.ViewVec);
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float3 cR = reflect (cI, normalize(input.Normal));
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cR = mul(ubo.invModel, float4(cR, 0.0)).xyz;
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// Convert cubemap coordinates into Vulkan coordinate space
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cR.z *= -1.0;
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float4 color = samplerColor.SampleLevel(cR, input.LodBias);
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float3 N = normalize(input.Normal);
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float3 L = normalize(input.LightVec);
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float3 V = normalize(input.ViewVec);
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float3 R = reflect(-L, N);
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float3 ambient = float3(0.5, 0.5, 0.5) * color.rgb;
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float3 diffuse = max(dot(N, L), 0.0) * float3(1.0, 1.0, 1.0);
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float3 specular = pow(max(dot(R, V), 0.0), 16.0) * float3(0.5, 0.5, 0.5);
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return float4(ambient + diffuse * color.rgb + specular, 1.0);
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}
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