[WIP] Add compute pipeline example

EngineKit.sln

@@ -33,6 +33,12 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Swapchain.Assets", "example
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Swapchain", "examples\Swapchain\Swapchain\Swapchain.csproj", "{429972C0-ECDF-4E78-BA31-567732C86AFA}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "ComputeConvolution", "ComputeConvolution", "{7F49DA89-CC45-4D03-AC70-6D84A79AC134}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ComputeConvolution.Assets", "examples\ComputeConvolution\ComputeConvolution.Assets\ComputeConvolution.Assets.csproj", "{B2CDF93A-7131-4D21-BDD6-2D9440857B2B}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ComputeConvolution", "examples\ComputeConvolution\ComputeConvolution\ComputeConvolution.csproj", "{EF7B69DA-38E5-4E0D-AE29-5CF5AE21CCBA}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -49,6 +55,9 @@ Global
 		{29F56725-43B2-43C5-8675-E4FF7DC9FD65} = {1E1BD9CA-189A-45FD-8A36-A57C836C6BB6}
 		{C8063C91-B683-4189-A221-DF9835F7049C} = {29F56725-43B2-43C5-8675-E4FF7DC9FD65}
 		{429972C0-ECDF-4E78-BA31-567732C86AFA} = {29F56725-43B2-43C5-8675-E4FF7DC9FD65}
+		{7F49DA89-CC45-4D03-AC70-6D84A79AC134} = {1E1BD9CA-189A-45FD-8A36-A57C836C6BB6}
+		{B2CDF93A-7131-4D21-BDD6-2D9440857B2B} = {7F49DA89-CC45-4D03-AC70-6D84A79AC134}
+		{EF7B69DA-38E5-4E0D-AE29-5CF5AE21CCBA} = {7F49DA89-CC45-4D03-AC70-6D84A79AC134}
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
 		{8E305337-228C-4930-B355-91F1E82C64C8}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
@@ -83,5 +92,13 @@ Global
 		{429972C0-ECDF-4E78-BA31-567732C86AFA}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{429972C0-ECDF-4E78-BA31-567732C86AFA}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{429972C0-ECDF-4E78-BA31-567732C86AFA}.Release|Any CPU.Build.0 = Release|Any CPU
+		{B2CDF93A-7131-4D21-BDD6-2D9440857B2B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B2CDF93A-7131-4D21-BDD6-2D9440857B2B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B2CDF93A-7131-4D21-BDD6-2D9440857B2B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B2CDF93A-7131-4D21-BDD6-2D9440857B2B}.Release|Any CPU.Build.0 = Release|Any CPU
+		{EF7B69DA-38E5-4E0D-AE29-5CF5AE21CCBA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{EF7B69DA-38E5-4E0D-AE29-5CF5AE21CCBA}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{EF7B69DA-38E5-4E0D-AE29-5CF5AE21CCBA}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{EF7B69DA-38E5-4E0D-AE29-5CF5AE21CCBA}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 EndGlobal

examples/ComputeConvolution/ComputeConvolution.Assets/ComputeConvolution.Assets.csproj

@@ -0,0 +1,15 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net7.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <None Update="**\*">
+            <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+        </None>
+    </ItemGroup>
+
+</Project>

examples/ComputeConvolution/ComputeConvolution.Assets/Shaders/ConvolveSkybox.cs.glsl

@@ -0,0 +1,101 @@
+#version 460 core
+
+layout(binding = 0, rgba8) readonly uniform imageCube u_environment;
+layout(binding = 1, rgba16f) writeonly uniform imageCube u_irradiance;
+
+const float PI = 3.14159265359;
+
+vec3 cubeCoordToWorld(ivec3 cubeCoord, vec2 cubemapSize)
+{
+    vec2 texCoord = vec2(cubeCoord.xy) / cubemapSize;
+    texCoord = texCoord  * 2.0 - 1.0; // -1..1
+    switch(cubeCoord.z)
+    {
+        case 0: return vec3(1.0, -texCoord.yx); // posx
+        case 1: return vec3(-1.0, -texCoord.y, texCoord.x); //negx
+        case 2: return vec3(texCoord.x, 1.0, texCoord.y); // posy
+        case 3: return vec3(texCoord.x, -1.0, -texCoord.y); //negy
+        case 4: return vec3(texCoord.x, -texCoord.y, 1.0); // posz
+        case 5: return vec3(-texCoord.xy, -1.0); // negz
+    }
+    return vec3(0.0);
+}
+
+float max3(vec3 v)
+{
+  return max(max(v.x, v.y), v.z);
+}
+
+ivec3 texCoordToCube(vec3 texCoord, vec2 cubemapSize)
+{
+    vec3 abst = abs(texCoord);
+    texCoord /= max3(abst);
+
+    float cubeFace;
+    vec2 uvCoord;
+    if (abst.x > abst.y && abst.x > abst.z)
+    {
+        // x major
+        float negx = step(texCoord.x, 0.0);
+        uvCoord = mix(-texCoord.zy, vec2(texCoord.z, -texCoord.y), negx);
+        cubeFace = negx;
+    }
+    else if (abst.y > abst.z)
+    {
+        // y major
+        float negy = step(texCoord.y, 0.0);
+        uvCoord = mix(texCoord.xz, vec2(texCoord.x, -texCoord.z), negy);
+        cubeFace = 2.0 + negy;
+    }
+    else
+    {
+        // z major
+        float negz = step(texCoord.z, 0.0);
+        uvCoord = mix(vec2(texCoord.x, -texCoord.y), -texCoord.xy, negz);
+        cubeFace = 4.0 + negz;
+    }
+    uvCoord = (uvCoord + 1.0) * 0.5; // 0..1
+    uvCoord = uvCoord * cubemapSize;
+    uvCoord = clamp(uvCoord, vec2(0.0), cubemapSize - vec2(1.0));
+
+    return ivec3(ivec2(uvCoord), int(cubeFace));
+}
+
+layout (local_size_x = 16, local_size_y = 16, local_size_z = 1) in;
+void main()
+{
+    vec2 cubeSize = imageSize(u_irradiance);
+    ivec3 cubeCoord = ivec3(gl_GlobalInvocationID);
+    if (any(lessThan(cubeCoord, ivec3(0))) || any(greaterThanEqual(cubeCoord.xy, cubeSize)))
+    {
+        return;
+    }
+
+    vec3 worldPos = cubeCoordToWorld(cubeCoord, cubeSize);
+    // tangent space from origin point
+    vec3 normal = normalize(worldPos);
+    vec3 up = vec3(0.0, 1.0, 0.0);
+    vec3 right = normalize(cross(up, normal));
+    up = cross(normal, right);
+
+    vec3 irradiance = vec3(0.0);
+
+    //float sampleDelta = 0.025;
+    float sampleDelta = 1.0;
+    float nrSamples = 0.0;
+
+    for (float phi = 0.0; phi < 2.0 * PI; phi += sampleDelta)
+    {
+        for (float theta = 0.0; theta < 0.5 * PI; theta += sampleDelta)
+        {
+            vec3 tangentSample = vec3(sin(theta) * cos(phi),  sin(theta) * sin(phi), cos(theta));
+            vec3 sampleVec = tangentSample.x * right + tangentSample.y * up + tangentSample.z * normal;
+            ivec3 sampleCoord = texCoordToCube(sampleVec, cubeSize);
+            irradiance += imageLoad(u_environment, sampleCoord).rgb * cos(theta) * sin(theta);
+            nrSamples++;
+        }
+    }
+
+    irradiance = PI * irradiance * (1.0 / float(nrSamples));
+    imageStore(u_irradiance, cubeCoord, vec4(irradiance, 1.0));
+}

examples/ComputeConvolution/ComputeConvolution.Assets/Shaders/FST.vs.glsl

@@ -0,0 +1,14 @@
+#version 460 core
+
+layout (location = 0) out gl_PerVertex
+{
+    vec4 gl_Position;
+};
+layout(location = 1) out vec2 fs_uv;
+
+void main()
+{
+    vec2 pos = vec2(gl_VertexID == 0, gl_VertexID == 2);
+    fs_uv = pos.xy * 2.0;
+    gl_Position = vec4(pos * 4.0 - 1.0, 0.0, 1.0);
+}

examples/ComputeConvolution/ComputeConvolution.Assets/Shaders/Texture.fs.glsl

@@ -0,0 +1,12 @@
+#version 460 core
+
+layout(location = 0) in vec2 v_uv;
+
+layout(location = 0) uniform sampler2D s_texture;
+
+layout(location = 0) out vec4 o_color;
+
+void main()
+{
+    o_color = texture(s_texture, v_uv);
+}

examples/ComputeConvolution/ComputeConvolution/ComputeConvolution.csproj

@@ -0,0 +1,38 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net7.0</TargetFramework>
+        <ImplicitUsings>disable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <IsPackable>false</IsPackable>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="..\..\..\src\EngineKit\EngineKit.csproj" />
+        <ProjectReference Include="..\ComputeConvolution.Assets\ComputeConvolution.Assets.csproj" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="7.0.0" />
+        <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="7.0.0" />
+        <PackageReference Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="7.0.0" />
+        <PackageReference Include="Serilog.Sinks.Console" Version="4.1.0" />
+        <PackageReference Include="Serilog.Sinks.File" Version="5.0.0" />
+        <PackageReference Include="Serilog" Version="2.12.0" />
+        <PackageReference Include="Serilog.Settings.Configuration" Version="3.4.0" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <None Update="appsettings.json">
+            <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+        </None>
+    </ItemGroup>
+
+    <ItemGroup>
+      <Reference Include="Serilog">
+        <HintPath>..\..\..\..\..\..\..\..\.nuget\packages\serilog\2.12.0\lib\net6.0\Serilog.dll</HintPath>
+      </Reference>
+    </ItemGroup>
+
+</Project>