Method DrawFog

Source/Engine/Level/Actors/ExponentialHeightFog.cpp:189–216

    });

void ExponentialHeightFog::DrawFog(GPUContext* context, RenderContext& renderContext, GPUTextureView* output)
{
    PROFILE_GPU_CPU("Exponential Height Fog");
    auto volumetricFogTexture = renderContext.List->Fog.VolumetricFogTexture;
    bool useVolumetricFog = volumetricFogTexture != nullptr;

    // Setup shader inputs
    Data data;
    GBufferPass::SetInputs(renderContext.View, data.GBuffer);
    data.ExponentialHeightFog = renderContext.List->Fog.ExponentialHeightFogData;
    data.VolumetricFog = renderContext.List->Fog.VolumetricFogData;
    data.TemporalAAJitter = renderContext.View.TemporalAAJitter;
    auto cb = _shader->GetShader()->GetCB(0);
    ASSERT_LOW_LAYER(cb->GetSize() == sizeof(Data));
    context->UpdateCB(cb, &data);
    context->BindCB(0, cb);
    context->BindSR(0, renderContext.Buffers->DepthBuffer);
    context->BindSR(1, volumetricFogTexture);

    // TODO: instead of rendering fullscreen triangle, draw quad transformed at the fog start distance (also it could use early depth discard)
    // TODO: or use DepthBounds to limit the fog rendering to the distance range

    // Draw fog
    const int32 psIndex = (useVolumetricFog ? 1 : 0);
    context->SetState(_psFog.Get(psIndex));
    context->SetRenderTarget(output);
    context->DrawFullscreenTriangle();
}

void ExponentialHeightFog::OnEnable()
{