Method ConvertToEVSM

BakingLab/MeshRenderer.cpp:507–593

Convert to an EVSM map

// Convert to an EVSM map
void MeshRenderer::ConvertToEVSM(ID3D11DeviceContext* context, uint32 cascadeIdx, Float3 cascadeScale)
{
    PIXEvent event(L"EVSM Conversion");

    float blendFactor[4] = {1, 1, 1, 1};
    context->OMSetBlendState(blendStates.BlendDisabled(), blendFactor, 0xFFFFFFFF);
    context->RSSetState(rasterizerStates.NoCull());
    context->OMSetDepthStencilState(depthStencilStates.DepthDisabled(), 0);
    ID3D11Buffer* vbs[1] = { NULL };
    uint32 strides[1] = { 0 };
    uint32 offsets[1] = { 0 };
    context->IASetVertexBuffers(0, 1, vbs, strides, offsets);
    context->IASetIndexBuffer(NULL, DXGI_FORMAT_R32_UINT, 0);
    context->IASetInputLayout(NULL);

    SetViewport(context, sunVSM.Width, sunVSM.Height);

    evsmConstants.Data.PositiveExponent = PositiveExponent;
    evsmConstants.Data.NegativeExponent = NegativeExponent;
    evsmConstants.Data.CascadeScale = meshPSConstants.Data.CascadeScales[cascadeIdx].To3D();
    evsmConstants.Data.FilterSize = 1.0f;
    evsmConstants.Data.ShadowMapSize.x = float(sunVSM.Width);
    evsmConstants.Data.ShadowMapSize.y = float(sunVSM.Height);
    evsmConstants.ApplyChanges(context);
    evsmConstants.SetPS(context, 0);

    context->VSSetShader(fullScreenVS, NULL, 0);
    context->PSSetShader(evsmConvertPS, NULL, 0);

    ID3D11RenderTargetView* rtvs[1] = { sunVSM.RTVArraySlices[cascadeIdx] };
    context->OMSetRenderTargets(1, rtvs, NULL);

    ID3D11ShaderResourceView* srvs[1] = { sunShadowDepthMap.SRView };
    context->PSSetShaderResources(0, 1, srvs);

    context->Draw(3, 0);

    srvs[0] = NULL;
    context->PSSetShaderResources(0, 1, srvs);

    const float FilterSizeU = std::max(FilterSize * cascadeScale.x, 1.0f);
    const float FilterSizeV = std::max(FilterSize * cascadeScale.y, 1.0f);

    if(FilterSizeU > 1.0f || FilterSizeV > 1.0f)
    {
        // Horizontal pass
        evsmConstants.Data.FilterSize = FilterSizeU;
        evsmConstants.ApplyChanges(context);

        uint32 sampleRadiusU = static_cast<uint32>((FilterSizeU / 2) + 0.499f);

        rtvs[0] = tempVSM.RTView;
        context->OMSetRenderTargets(1, rtvs, NULL);

        srvs[0] = sunVSM.SRVArraySlices[cascadeIdx];
        context->PSSetShaderResources(0, 1, srvs);

        context->PSSetShader(evsmBlurH, NULL, 0);