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+ 添加公告板树的代码
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‎Chapter 12 The Geometry Shader/Chapter 12 The Geometry Shader.vcxproj

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<ShaderType Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">Pixel</ShaderType>
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<ShaderType Condition="'$(Configuration)|$(Platform)'=='Release|x64'">Pixel</ShaderType>
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</FxCompile>
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<FxCompile Include="Core\Shaders\billboardGS.hlsl">
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<ShaderType Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">Geometry</ShaderType>
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<ShaderType Condition="'$(Configuration)|$(Platform)'=='Release|x64'">Geometry</ShaderType>
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</FxCompile>
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<FxCompile Include="Core\Shaders\billboardPS.hlsl">
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<ShaderType Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">Pixel</ShaderType>
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<ShaderType Condition="'$(Configuration)|$(Platform)'=='Release|x64'">Pixel</ShaderType>
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</FxCompile>
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<FxCompile Include="Core\Shaders\billboardVS.hlsl">
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<ShaderType Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">Vertex</ShaderType>
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<ShaderType Condition="'$(Configuration)|$(Platform)'=='Release|x64'">Vertex</ShaderType>
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</FxCompile>
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<FxCompile Include="Core\Shaders\Bitonic32InnerSortCS.hlsl" />
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<FxCompile Include="Core\Shaders\Bitonic32OuterSortCS.hlsl" />
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<FxCompile Include="Core\Shaders\Bitonic32PreSortCS.hlsl" />

‎Chapter 12 The Geometry Shader/Chapter 12 The Geometry Shader.vcxproj.filters

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<FxCompile Include="Core\Shaders\defaultPS.hlsl">
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<Filter>Shaders\default</Filter>
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</FxCompile>
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<FxCompile Include="Core\Shaders\billboardVS.hlsl">
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<Filter>Shaders\default</Filter>
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</FxCompile>
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<FxCompile Include="Core\Shaders\billboardGS.hlsl">
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<Filter>Shaders\default</Filter>
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</FxCompile>
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<FxCompile Include="Core\Shaders\billboardPS.hlsl">
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<Filter>Shaders\default</Filter>
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</FxCompile>
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</ItemGroup>
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<ItemGroup>
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<Text Include="Core\Graphics\Command\readme_command.txt">

‎Chapter 12 The Geometry Shader/Core/Shaders/billboardGS.hlsl

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// Include structures and functions for lighting.
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#include "LightingUtil.hlsl"
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// Constant data that varies per frame.
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cbuffer cbPass : register(b1)
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{
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float4x4 gViewProj;
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float3 gEyePosW;
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float pad;
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float4 gAmbientLight;
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// Allow application to change fog parameters once per frame.
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// For example, we may only use fog for certain times of day.
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float4 gFogColor;
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float gFogStart;
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float gFogRange;
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float2 pad2;
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// Indices [0, NUM_DIR_LIGHTS) are directional lights;
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// indices [NUM_DIR_LIGHTS, NUM_DIR_LIGHTS+NUM_POINT_LIGHTS) are point lights;
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// indices [NUM_DIR_LIGHTS+NUM_POINT_LIGHTS, NUM_DIR_LIGHTS+NUM_POINT_LIGHT+NUM_SPOT_LIGHTS)
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// are spot lights for a maximum of MaxLights per object.
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Light gLights[MaxLights];
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};
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struct VertexOut
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{
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float3 CenterW : POSITION;
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float2 SizeW : SIZE;
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};
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struct GeoOut
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{
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float4 PosH : SV_POSITION; // 顶点的齐次坐标
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float3 PosW : POSITION; // 顶点的世界坐标
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float3 NormalW : NORMAL; // 顶点的世界法向量
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float2 TexC : TEXCOORD; // 顶点的纹理坐标
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uint PrimID : SV_PrimitiveID; // 顶点ID
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};
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[maxvertexcount(4)]
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void main(
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point VertexOut gin[1],
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uint primID : SV_PrimitiveID,
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inout TriangleStream< GeoOut > triStream
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)
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{
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// 计算up向量
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float3 up = float3(0.0f, 1.0f, 0.0f);
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// 计算目标点到观察点的向量
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float3 look = gEyePosW - gin[0].CenterW;
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// 保证目标点和观察点在通一个xz平面
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look.y = 0.0f;
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// 标准化
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look = normalize(look);
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// 计算右向量
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float3 right = cross(up, look);
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// 计算公告板树的宽和高
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float halfWidth = 0.5f * gin[0].SizeW.x;
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float halfHeight = 0.5f * gin[0].SizeW.y;
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// 计算树的4个顶点
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float4 v[4];
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v[0] = float4(gin[0].CenterW + halfWidth * right - halfHeight * up, 1.0f);
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v[1] = float4(gin[0].CenterW + halfWidth * right + halfHeight * up, 1.0f);
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v[2] = float4(gin[0].CenterW - halfWidth * right - halfHeight * up, 1.0f);
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v[3] = float4(gin[0].CenterW - halfWidth * right + halfHeight * up, 1.0f);
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// 四个点对应的纹理坐标
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float2 texC[4] =
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{
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float2(0.0f, 1.0f),
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float2(0.0f, 0.0f),
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float2(1.0f, 1.0f),
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float2(1.0f, 0.0f)
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};
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// 输出图源
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GeoOut gout;
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[unroll]
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for (int i = 0; i < 4; ++i)
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{
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gout.PosH = mul(v[i], gViewProj); // 顶点由世界坐标系转到投影坐标系
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gout.PosW = v[i].xyz; // 顶点的世界坐标
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gout.NormalW = look; // 顶点的法向量
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gout.TexC = texC[i]; // 顶点的纹理
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gout.PrimID = primID; // 该顶点所组成的面的ID
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triStream.Append(gout);
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}
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}

‎Chapter 12 The Geometry Shader/Core/Shaders/billboardPS.hlsl

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//***************************************************************************************
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// Default.hlsl by Frank Luna (C) 2015 All Rights Reserved.
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//
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// Default shader, currently supports lighting.
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//***************************************************************************************
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// Defaults for number of lights.
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#ifndef NUM_DIR_LIGHTS
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#define NUM_DIR_LIGHTS 3
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#endif
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#ifndef NUM_POINT_LIGHTS
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#define NUM_POINT_LIGHTS 0
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#endif
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#ifndef NUM_SPOT_LIGHTS
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#define NUM_SPOT_LIGHTS 0
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#endif
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// Include structures and functions for lighting.
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#include "LightingUtil.hlsl"
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Texture2DArray gTreeMapArray : register(t0);
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SamplerState gsamAnisotropicWrap : register(s0);
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// Constant data that varies per frame.
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cbuffer cbPass : register(b1)
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{
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float4x4 gViewProj;
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float3 gEyePosW;
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float pad;
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float4 gAmbientLight;
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// Allow application to change fog parameters once per frame.
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// For example, we may only use fog for certain times of day.
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float4 gFogColor;
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float gFogStart;
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float gFogRange;
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float2 pad2;
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// Indices [0, NUM_DIR_LIGHTS) are directional lights;
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// indices [NUM_DIR_LIGHTS, NUM_DIR_LIGHTS+NUM_POINT_LIGHTS) are point lights;
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// indices [NUM_DIR_LIGHTS+NUM_POINT_LIGHTS, NUM_DIR_LIGHTS+NUM_POINT_LIGHT+NUM_SPOT_LIGHTS)
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// are spot lights for a maximum of MaxLights per object.
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Light gLights[MaxLights];
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};
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// Constant data that varies per material.
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cbuffer cbMaterial : register(b2)
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{
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float4 gDiffuseAlbedo;
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float3 gFresnelR0;
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float gPad;
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float gRoughness;
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};
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struct GeoOut
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{
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float4 PosH : SV_POSITION; // 顶点的齐次坐标
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float3 PosW : POSITION; // 顶点的世界坐标
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float3 NormalW : NORMAL; // 顶点的世界法向量
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float2 TexC : TEXCOORD; // 顶点的纹理坐标
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uint PrimID : SV_PrimitiveID; // 顶点ID
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};
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float4 main(GeoOut pin) : SV_Target0
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{
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float3 uvw = float3(pin.TexC, pin.PrimID % 3);
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float4 diffuseAlbedo = gTreeMapArray.Sample(gsamAnisotropicWrap, uvw) * gDiffuseAlbedo;
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// 透明像素点剔除
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// Discard pixel if texture alpha < 0.1. We do this test as soon
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// as possible in the shader so that we can potentially exit the
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// shader early, thereby skipping the rest of the shader code.
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clip(diffuseAlbedo.a - 0.1f);
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// Interpolating normal can unnormalize it, so renormalize it.
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pin.NormalW = normalize(pin.NormalW);
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// Vector from point being lit to eye.
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float3 toEyeW = gEyePosW - pin.PosW;
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float distToEye = length(toEyeW);
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toEyeW /= distToEye; // normalize
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// Indirect lighting.
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float4 ambient = gAmbientLight * diffuseAlbedo;
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const float shininess = 1.0f - gRoughness;
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Material mat = { diffuseAlbedo, gFresnelR0, shininess };
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float3 shadowFactor = 1.0f;
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float4 directLight = ComputeLighting(gLights, mat, pin.PosW,
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pin.NormalW, toEyeW, shadowFactor);
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float4 litColor = ambient + directLight;
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// 雾，如果雾的颜色alpha为0，则不处理
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if (gFogColor.a > 0.01)
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{
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float fogAmount = saturate((distToEye - gFogStart) / gFogRange);
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litColor = lerp(litColor, gFogColor, fogAmount);
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}
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// Common convention to take alpha from diffuse material.
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litColor.a = diffuseAlbedo.a;
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return litColor;
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}

‎Chapter 12 The Geometry Shader/Core/Shaders/billboardVS.hlsl

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struct VertexIn
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{
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float3 PosW : POSITION; // 顶点的世界坐标
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float2 SizeW : SIZE; // 顶点的宽高
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};
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struct VertexOut
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{
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float3 CenterW : POSITION; // 中心点的世界坐标
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float2 SizeW : SIZE; // 宽高
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};
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VertexOut main(VertexIn vin)
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{
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VertexOut vout;
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// 顶点直接传给几何着色器
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vout.CenterW = vin.PosW;
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vout.SizeW = vin.SizeW;
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return vout;
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}

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