Method PrecomputeCubemaps

PBR/src/PBR_Renderer.cpp:567–803

}

void PBR_Renderer::PrecomputeCubemaps(IDeviceContext* pCtx,
                                      ITextureView*   pEnvironmentMap,
                                      Uint32          NumDiffuseSamples,
                                      Uint32          NumSpecularSamples,
                                      bool            OptimizeSamples)
{
    if (!m_Settings.EnableIBL)
    {
        LOG_WARNING_MESSAGE("IBL is disabled, so precomputing cube maps will have no effect");
        return;
    }

    if (NumSpecularSamples == 0)
    {
        NumSpecularSamples = 256;
    }
    if (NumDiffuseSamples == 0)
    {
        NumDiffuseSamples = GetDefaultDiffuseSamplesCount(m_Device.GetAdapterInfo());
    }

    struct PrecomputeEnvMapAttribs
    {
        float4x4 Rotation;

        float Roughness;
        float EnvMapWidth;
        float EnvMapHeight;
        float EnvMapMipCount;

        uint NumSamples;
        uint Padding0;
        uint Padding1;
        uint Padding2;
    };

    if (!m_PrecomputeEnvMapAttribsCB)
    {
        CreateUniformBuffer(m_Device, sizeof(PrecomputeEnvMapAttribs), "Precompute env map attribs CB", &m_PrecomputeEnvMapAttribsCB);
    }

    IBL_FEATURE_FLAGS FeatureFlags = IBL_FEATURE_FLAG_NONE;

    if (OptimizeSamples)
        FeatureFlags |= IBL_FEATURE_FLAG_OPTIMIZE_SAMPLES;

    const IBL_PSOKey::ENV_MAP_TYPE EnvMapType = pEnvironmentMap->GetTexture()->GetDesc().IsCube() ?
        IBL_PSOKey::ENV_MAP_TYPE_CUBE :
        IBL_PSOKey::ENV_MAP_TYPE_SPHERE;

    ShaderMacroHelper Macros;
    Macros
        .Add("OPTIMIZE_SAMPLES", (FeatureFlags & IBL_FEATURE_FLAG_OPTIMIZE_SAMPLES) != 0)
        .Add("ENV_MAP_TYPE_CUBE", static_cast<int>(IBL_PSOKey::ENV_MAP_TYPE_CUBE))
        .Add("ENV_MAP_TYPE_SPHERE", static_cast<int>(IBL_PSOKey::ENV_MAP_TYPE_SPHERE))
        .Add("ENV_MAP_TYPE", static_cast<int>(EnvMapType));

    auto& PrecomputeIrradianceCubeTech = m_IBL_PSOCache[IBL_PSOKey{IBL_PSOKey::PSO_TYPE_IRRADIANCE_CUBE, EnvMapType, FeatureFlags, m_pIrradianceCubeSRV->GetDesc().Format}];