94 lines
3.4 KiB
HLSL
94 lines
3.4 KiB
HLSL
// [新增] 相机背景天空盒。
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// CPU 不创建天空盒网格；VS 使用 SV_VertexID 读取内置 36 个顶点。
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#pragma pack_matrix(row_major)
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#include "include/pbr_brdf.hlsli"
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cbuffer CBScene : register(b0) {
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row_major float4x4 gView;
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row_major float4x4 gProjection;
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float4 gCameraPosition;
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float4 gLightDirection;
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float4 gLightColorIntensity;
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float4 gAmbientColorIntensity;
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float4 gRenderParams; // x=exposure
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};
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cbuffer CBIBL : register(b4) {
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// x=intensity, y=prefilter max mip, z=Y rotation, w=enabled
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float4 gIblParams;
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};
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TextureCube<float4> gSkyboxCube : register(t12);
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SamplerState gSkyboxSampler : register(s4);
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static const float3 gCubeVertices[36] = {
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// -Z
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float3(-1.0f, -1.0f, -1.0f), float3(-1.0f, 1.0f, -1.0f), float3( 1.0f, 1.0f, -1.0f),
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float3(-1.0f, -1.0f, -1.0f), float3( 1.0f, 1.0f, -1.0f), float3( 1.0f, -1.0f, -1.0f),
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// +Z
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float3(-1.0f, -1.0f, 1.0f), float3( 1.0f, 1.0f, 1.0f), float3(-1.0f, 1.0f, 1.0f),
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float3(-1.0f, -1.0f, 1.0f), float3( 1.0f, -1.0f, 1.0f), float3( 1.0f, 1.0f, 1.0f),
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// -X
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float3(-1.0f, -1.0f, -1.0f), float3(-1.0f, -1.0f, 1.0f), float3(-1.0f, 1.0f, 1.0f),
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float3(-1.0f, -1.0f, -1.0f), float3(-1.0f, 1.0f, 1.0f), float3(-1.0f, 1.0f, -1.0f),
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// +X
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float3( 1.0f, -1.0f, -1.0f), float3( 1.0f, 1.0f, 1.0f), float3( 1.0f, -1.0f, 1.0f),
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float3( 1.0f, -1.0f, -1.0f), float3( 1.0f, 1.0f, -1.0f), float3( 1.0f, 1.0f, 1.0f),
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// -Y
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float3(-1.0f, -1.0f, -1.0f), float3( 1.0f, -1.0f, 1.0f), float3(-1.0f, -1.0f, 1.0f),
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float3(-1.0f, -1.0f, -1.0f), float3( 1.0f, -1.0f, -1.0f), float3( 1.0f, -1.0f, 1.0f),
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// +Y
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float3(-1.0f, 1.0f, -1.0f), float3(-1.0f, 1.0f, 1.0f), float3( 1.0f, 1.0f, 1.0f),
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float3(-1.0f, 1.0f, -1.0f), float3( 1.0f, 1.0f, 1.0f), float3( 1.0f, 1.0f, -1.0f)
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};
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struct VSOutput {
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float4 positionCS : SV_POSITION;
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float3 directionWS : TEXCOORD0;
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};
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VSOutput VSMain(uint vertexId : SV_VertexID) {
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VSOutput output;
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const float3 positionWS = gCubeVertices[vertexId];
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// [修改] w=0 只应用相机旋转，不应用相机平移；天空盒因此始终以相机为中心。
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const float3 positionVS = mul(float4(positionWS, 0.0f), gView).xyz;
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float4 positionCS = mul(float4(positionVS, 1.0f), gProjection);
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// [新增] 固定到远平面；配合 LESS_EQUAL 和深度不写入，仅覆盖背景像素。
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positionCS.z = positionCS.w;
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output.positionCS = positionCS;
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output.directionWS = positionWS;
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return output;
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}
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float3 RotateAroundY(float3 direction, float radians) {
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float sineValue;
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float cosineValue;
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sincos(radians, sineValue, cosineValue);
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return float3(
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cosineValue * direction.x + sineValue * direction.z,
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direction.y,
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-sineValue * direction.x + cosineValue * direction.z);
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}
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float4 PSMain(VSOutput input) : SV_TARGET {
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const float3 sampleDirection = RotateAroundY(
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normalize(input.directionWS), gIblParams.z);
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float3 color = gSkyboxCube.SampleLevel(
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gSkyboxSampler, sampleDirection, 0.0f).rgb;
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// [修改] enabled 只控制物体 IBL；天空背景在 Cube 已加载时始终显示。
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color *= max(gIblParams.x, 0.0f);
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// 与 PBR 物体使用相同曝光、色调映射和显示编码。
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color *= max(gRenderParams.x, 0.0f);
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color = ToneMapACES(color);
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color = pow(max(color, 0.0f), 1.0f / 2.2f);
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return float4(color, 1.0f);
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}
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