Method BuildHiZ

Source/Engine/Renderer/Utils/MultiScaler.cpp:251–292

}

void MultiScaler::BuildHiZ(GPUContext* context, GPUTexture* srcDepth, GPUTexture* dstHiZ)
{
    PROFILE_GPU_CPU("Build HiZ");

    int32 dstWidth = dstHiZ->Width();
    int32 dstHeight = dstHiZ->Height();

    // Copy mip0
    if (srcDepth->Size() == dstHiZ->Size() && srcDepth->Format() == dstHiZ->Format())
    {
        context->CopySubresource(dstHiZ, 0, srcDepth, 0);
    }
    else if (srcDepth->Size() == dstHiZ->Size())
    {
        context->Draw(dstHiZ, srcDepth);
    }
    else
    {
        context->SetViewportAndScissors((float)dstWidth, (float)dstHeight);
        context->SetRenderTarget(dstHiZ->View());
        context->BindSR(0, srcDepth);
        context->SetState(_psHalfDepth[2]);
        context->DrawFullscreenTriangle();
    }

    // Build mip chain
    for (int32 mip = 1; mip < dstHiZ->MipLevels(); mip++)
    {
        const int32 mipWidth = Math::Max(dstWidth >> mip, 1);
        const int32 mipHeight = Math::Max(dstHeight >> mip, 1);
        context->ResetRenderTarget();

        context->SetViewportAndScissors((float)mipWidth, (float)mipHeight);
        context->SetRenderTarget(dstHiZ->View(0, mip));
        context->BindSR(0, dstHiZ->View(0, mip - 1));
        context->SetState(_psHalfDepth[2]);
        context->DrawFullscreenTriangle();
    }

    context->ResetRenderTarget();
    context->UnBindCB(0);
}

void MultiScaler::Upscale(GPUContext* context, const Viewport& viewport, GPUTexture* src, GPUTextureView* dst)
{